WATER AND WASTEWATER TREATMENT www.balmoraltanks.com
Information
Technical data
Wastewater treatment plant
Rainwater harvesting systems
Water storage
Balmoral Tanks
Wastewater treatment plant
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Septic tanks Balmoral Continuous Aeration Plant (CAP) Balmoral HydroClearTM Balmoral Sequential Batch Reactor (SBR)
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Home-HarvestTM rainwater system Garden-HarvestTM rainwater system
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Balmoral rainwater harvesting systems
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Water storage
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Balmoral Tanks Ltd
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Above ground water storage Underground water storage Balmoral Hydrostack emergency water storage
Balmoral Group
HEAD OFFICE AND FACTORIES
Balmoral Park, Loirston, Aberdeen AB12 3GY, Scotland Tel +44 (0)1224 859000 Fax +44 (0)1224 859123
Email
[email protected] www.balmoraltanks.com ©2009 Balmoral Tanks. All rights reserved. This publication is protected by copyright. No part of it may be reproduced, stored in a retrieval system, or transmitted, in any form, by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the copyright owners. Balmoral Tanks believe that the information printed in this brochure is accurate, and published for information only. No warrants, express or implied, are contained therein, nor does any legal liability attach to Balmoral Tanks for any reason whatsoever. The company’s policy is one of continuous product improvement and we reserve the right to make alterations to our range and specification without prior notice.
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Wastewater treatment plant
WASTEWATER TREATMENT PLANT
Reference should be made to the following guidance notes • Environment Agency Pollution Prevention Guidelines PPG4 • British Standards 6297 • European Standards BSEN12566 • Building Control Regulations 2000 Part H Drainage and Waste Disposal, 2002 edition • British Water Flows and Loads - 2
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Mains and off-mains drainage
The majority of houses in the UK are linked to the public sewerage system; you pull the plug, flush the toilet, pay the monthly bill and have little more to worry about. This is mains drainage.
In rural areas many homes and villages are self-contained, ie, the wastewater flows to a cesspool, septic tank or treatment plant. This has no connection to the public sewerage system and is known as off-mains.
Choosing the right sewage treatment and disposal method for your site is essential to ensure value for money, effective longterm performance, protection of public health and the environment, and compliance with relevant legislation*
If you’re off-mains what are your options?
If you seek a solution to your off-mains wastewater disposal, one of the three following options will be required: Q Septic tank Q Package wastewater treatment plant Q Cesspool
Septic tank
Septic tank Solids and liquids separate in a septic tank with the liquids receiving minimum biological treatment. The liquid in the centre of the tank is discharged via an outlet before passing through a soakaway system which must be installed to national standards.
The solids that gather at the bottom of the tank must be emptied regularly to prevent overflow and potential soakaway damage.
Package wastewater treatment plant
Package wastewater treatment plant So-called because these products bring together all the requirements to treat wastewater to a high standard within a single pre-fabricated system. Generally consisting of a two or three chamber treatment process, effluent is treated aerobically, ie, using oxygen, to such a standard that it is usually acceptable to discharge directly into watercourse.
Package treatment plants require an electrical connection and should be emptied regularly dependent on usage and capacity.
Cesspool This is a single watertight underground chamber which simply stores raw sewage for collection. Usually constructed in GRP, concrete or brick these can be very large and must be emptied regularly to avoid overflowing.
Cesspool * Source: EA PPG4
Unless there is absolutely no other solution - where the ground conditions prevent the installation of a soakaway system or there is no natural watercourse to discharge to for example cesspools are not a favoured choice, either of the property owner or the environmental agencies.
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Which one is for you?
Now that you have identified the requirement for a wastewater treatment system, how do you know which one is correct for your property?
As the final effluent will be discharged into the ground via a soakaway, raised mound, reed bed or watercourse, a full assessment should be undertaken by a qualified engineer.
This will normally include geographic research in terms of water table height, a site visit and a percolation test. Combined, these factors will determine the type of system that best meets your criteria.
Contact local Building Control (BC) office and environmental regulator for selection of discharge type1
Pollution of the environment is a criminal offence and compliance with one or more Guidance Note is not a defence to such offences. It is recommended that you check the references to other sources of guidance to ensure they are still current*
Public Sewer discharge
1 2
Consent to discharge
Where effluent will be discharged to a watercourse and depending on the volume, consent must be granted by your local environment agency before you begin your installation. If you do not obtain such a “licence” you may be liable to prosecution.
Your agency will be happy to advise you on the level of effluent treatment required in the area and this information will help you determine which type of wastewater treatment plant should be installed. You will then be required to complete and submit a Consent to Discharge application form including a fee to the appropriate agency.
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Consent to discharge criteria is normally expressed in permitted milligrams per litre for the following factors: Q Biochemical Oxygen Demand (BOD) Q Suspended Solids (SS) Q Ammonia (NH3) * Source: EA PPG4
Surface/open water discharge
Discuss BC approval for septic tank2 discharge through soakaway system (subject to site assessment)
Obtain approval from environmental regulator for discharge authorisation Consent Licence Registration (CLR)
Perform site assessment for gravity or pumped discharge to public sewer point
Perform site assessment for soakaway suitability, including percolation test
Perform site assessment and using CLR, select Balmoral Hydroclear, CAP or SBR to suit effluent quality and population requirement
Submit plans with details of proposed system to BC for final approval
Size system for population requirement and submit plans to BC for final approval
Submit plans with details of proposed system to BC for final approval
Site unsuitable for soakaway
Confirm acceptance to adopt discharge with local water company provider
Soakaway discharge
Balmoral Tanks Sales will be able to offer further independent advice where multiple options exist In some circumstances a Package Treatment Plant may be required - select Balmoral Hydroclear, CAP or SBR
Will you need planning permission?
You should contact your local authority to determine whether or not planning permission is required before you begin the project.
Quite often, in new build situations particularly, this approval will form part of the overall permission but be sure to have this clarified in every case.
Installation
It is recommended that wastewater treatment plants shouldn’t be sited any nearer than 25m from an inhabitated building although some local authorities may allow installation considerably closer. For single house installations 15m is generally considered as a reasonable distance though agreement should always be sought from your local authority before installation.
The plant should not be installed close to a driveway or road or indeed anywhere else where there is a risk of it being subjected to additional superimposed loadings.
Access should be maintained for the desludging tanker, these can normally achieve a reach of approximately 20m.
Any proposals for non-mains sewerage systems must take account of the requirements of Building Regulations and should be discussed with the local planning authority at an early stage and well before any planning application is made*
The installation must be carried out by suitably qualified personnel and special care is required when installing in adverse conditions such rocky substrata or where the water table runs high, for example.
Sewage treatment is an ongoing process and the micro-organisms must stay healthy for the system to work. You should desludge the system regularly to prevent the build up of sludge and solids so that sewage flows freely through the unit*
Commissioning, maintenance and after sales support
We would always recommend that your wastewater treatment plant is commissioned, ie, installation check and initial activation, by a Balmoral approved engineer. We would also recommend that you undertake an annual maintenance programme to ensure your plant continues to operate at its full potential. We will be very happy to help you initiate this, if requested, when your plant is commissioned. In any case, you should inspect your wastewater plant monthly to ensure the effluent is flowing freely. Desludging intervals are dependent upon the tank’s capacity and further information on this is provided in the productspecific sections. Our after sales support team is always available either by calling 01283 562382 or by sending an email to
[email protected]. We will be happy to answer your questions if you don’t find the information you require at the FAQ section of our website.
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Septic tanks
SEPTIC TANKS
Key benefits Q Impact resistant body moulded in one-piece polyethylene
Q Wide base and lifting eyes Q Adjustable invert depth
Q Fully sized, two stage separation treatment chambers
Q Integral venting pipework
Q Wide range to suit population requirements Q BBA Accredited (Cert. no. 94/3021)
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SEPTIC TANKS A septic tank is designed to provide what is known as primary treatment to crude wastewater produced in a normal domestic environment. It retains solids and allows them to settle out, where they can be partially broken down by biological action so that only the remaining liquor is left to flow down the outlet drain. This liquor (normally called effluent) is then sufficiently treated to soak into the ground in an underground soakaway system.
How does it work?
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2
1
7
Balmoral septic tanks are designed in accordance with British Standard Code of Practice BS6297 and are based on a two chamber design (4 and 5) with a long flow path which ensures a high degree of settlement (6), thus providing a low level of suspended solids suitable for discharge (7) into an underground soakaway system.
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Design features
Q The tanks have a flat base for stability during transportation and storage prior to installation
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Q The tanks have Ø50mm moulded-in lifting eyes for use during handling and installation (To be used only when the tank is empty)
Q The inlet and outlet pipework is specially designed to disperse any noxious or inflammable gases into the atmosphere through the drainage ventilation Q The standard septic tank is designed to cater for drain invert depths of 770mm. The neck can be reduced to suit shallower invert depth
Q The inlet pipe can be rotated by 180° to line up with the drainage lines from almost any direction
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1 2 3 4 5 6 7
110mm Inlet Rodding access Pedestrian duty manhole cover Settlement chamber Cylindrical baffle Settlement 110mm Outlet
Q The system of baffles ensure that no crude solids escape into the outlet drain, avoiding premature blocking of the soakaway system
Q A fully lockable pedestrian duty manhole cover is supplied as standard to comply with statutory regulations
Q A safety grille can also be supplied as an optional item to fit across the access shaft as an additional safety feature
Q Balmoral septic tanks are tested and approved by the British Board of Agrément (Cert. no. 94/3021)
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BST27
Balmoral septic tanks
Max hydraulic load (l/day)
800
NH3 (g/per day)
n/a
Diameter (mm) Height (mm)
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
2700 1840
Population served
197 0
Ø110 Ø760
12 months
BST27-WLID-NN BBA
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
12
Ø1840
Ø760mm Nominal access Ground level
5-10
n/a
Height (mm)
Ø1275
(Cert No. 94/3021)
NH3 (g/day)
Diameter (mm)
770
890
2000
Total capacity (litres)
Outlet
770
Max hydraulic load (I/day)
Organic load (g BOD5/day)
Inlet
2400
BST38 Specifications
Reduced invert cut line
n/a
3800
Reduced invert cut line Inlet
Outlet
2045 2640 240 0
770 890
Ø110 Ø760
12 months
BST38-WLID-NN BBA
(Cert No. 94/3021)
890
Total capacity (litres)
n/a
770
Organic load (g BOD5/day)
Ground level
890
1-4
2400
Population served
2640
Specifications
Ø760mm Nominal access
Ø1275 Ø2045
NH3 (g/day)
n/a n/a
Total capacity (litres)
4500
Height (mm)
2770
Energy usage (kWh/day)
0
Diameter (mm)
Empty plant weight (kg)
Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
2165
Population served
Ø110 Ø760
12 months
BST45-WLID-NN BBA
6000
Height (mm)
3005
Energy usage (kWh/day)
0
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
Ø760mm Nominal access Ground level
Reduced invert cut line Inlet
Outlet
n/a
Total capacity (litres)
Outlet invert (mm)
Ø2165
15-22
n/a
Inlet invert (mm)
Ø1275
(Cert No. 94/3021)
NH3 (g/day)
Empty plant weight (kg)
770
890
4400
Diameter (mm)
Outlet
770
Max hydraulic load (I/day)
Organic load (g BOD5/day)
Inlet
275
BST60 Specifications
Reduced invert cut line
2365
890
Organic load (g BOD5/day)
2800
770
Max hydraulic load (l/day)
11-14
2770
Population served
Ground level
3005
Specifications
Ø760mm Nominal access
890
BST45
Balmoral septic tanks
335
770 890
Ø110 Ø760
12 months
BST60-WLID-NN BBA
(Cert No. 94/3021)
Ø1275 Ø2365
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BALMORAL CAP
Balmoral CAP
Continuous Aeration Plant
Key benefits Q Impact resistant body moulded in one-piece polyethylene
Q Wide base for stability and ease of handling and storage Q Sturdy lifting eyes for easy handling and installation
Q Achieves Royal Commission standards for effluent quality under normal domestic conditions Q Powered by a small, near silent air compressor Q Corrosion resistant
Q The Balmoral CAP is tested and approved by the Irish Agrément Board (Cert. no. 02/0148)
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BALMORAL CAP Continuous Aeration Plant
The Balmoral CAP is a biological aeration type treatment plant designed to produce a moderate quality of final effluent in addition to overcoming several of the common problems associated with small packaged domestic wastewater treatment units.
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Common problems which can occur are: Q “Fixed film” types, which have a “media” matrix, can suffer from media blockage because of excessive bacteria growth. Replacement/ maintenance of the media material may be required at regular intervals
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Q Mechanical/electrical components within the tanks are difficult to maintain and can be a safety risk Q The liquor is not spread evenly over the available bacteria preventing an adequate oxygen supply The Balmoral CAP overcomes these problems because: Q There is no “fixed” media within the CAP to become blocked - it operates on the “activated sludge” principal whereby the bacteria floats in suspension in the reactor vessel and forms an “active soup” of “mixed liquor”
Q All functions within the tank are operated by air power generated by a small compressor contained in the neck of the tank, allowing maintenance to be carried out safely and easily
Q The bacteria receives a high quality air supply and is completely mixed and aerated by the high volume fine bubble diffuser
How does it work?
Crude wastewater enters the main outer chamber (1) where the initial settlement takes place, with the heaviest solids sinking and the floating matter rising. The liquor from the main section is transferred to the central chamber (2) where it is continuously aerated by the fine bubble diffuser (4) which encourages bacteria to provide the second stage of treatment.
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3 1 2
4
1 2 3 4 5 6 7
Primary settlement tank Reactor vessel Transfer pipe Fine bubble diffuser Calming pipe Outlet pipe Air compressor
The mid section of this treated effluent is then removed from the chamber through a calming pipe (5) which allows a further brief settlement before discharge (6). The air compressor (7) runs continuously. It is contained within the neck of the tank and is accessible for maintenance if required. Easy access is available to both chambers for desludging which is an annual operation.
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CAP6
Balmoral Continuous Aeration Plant
NH3 (g/per day)
48
Diameter (mm) Height (mm)
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Pump version
Accreditation
3800
Population served
2640 250 770 890
Ø110 Ø760
12 months
BCAP-6-NN
BCAP-6-NN-WPUMP
IAB (Cert No. 02/0148)
48
Height (mm)
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Pump version
Accreditation
18
1-6
NH3 (g/per day)
Diameter (mm)
Ø1275 Ø2045
Low invert
1200
Total capacity (litres)
Outlet
1.4
Max hydraulic load (l/day)
Organic load (g BOD5/day)
Inlet
2045
CAP6 Specifications
Reduced invert cut line
Ø760mm Nominal access Ground level
360
3800
620
Total capacity (litres)
360
500
Organic load (g BOD5/day)
890
1200
770
1-6
Max hydraulic load (l/day)
2640
Population served
Ground level
Inlet
Outlet
2045 2370 250
2370
Specifications
Ø760mm Nominal access
1.4
500 620
Ø110 Ø760
12 months
BCAP-6-NN-LINV
BCAP-6-NN-WPUMP-LINV IAB (Cert No. 02/0148)
Ø1275 Ø2045
CAP12 96
6000
Height (mm)
3005
Energy usage (kWh/day)
1.8
Empty plant weight (kg)
Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Pump version
Accreditation
2365
Population served
Max hydraulic load (l/day)
Organic load (g BOD5/day)
NH3 (g/per day)
890
Ø110 Ø760
12 months
BCAP-12-NN
BCAP-12-NN-WPUMP
IAB (Cert No. 02/0148)
2400 96
2735
Energy usage (kWh/day)
1.8
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Pump version
Accreditation
Ø1275 Ø2365
Ø760mm Nominal access Ground level
Inlet
Outlet
720
Height (mm)
Inlet invert (mm)
Low invert
7-12
6000
Empty plant weight (kg)
890
770
Total capacity (litres)
Diameter (mm)
Outlet
345
CAP12 Specifications
Inlet
720
Total capacity (litres) Diameter (mm)
770
7-12
2400
620
NH3 (g/per day)
Reduced invert cut line
500
Organic load (g BOD5/day)
Ground level
3005
Population served
Max hydraulic load (l/day)
Ø760mm Nominal access
2365
2735
Specifications
Balmoral Continuous Aeration Plant
345
500 620
Ø110 Ø760
12 months
BCAP-12-NN-LINV
BCAP-12-NN-WPUMP-LINV IAB (Cert No. 02/0148)
Ø1275 Ø2365
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BALMORAL HYDROCLEAR
TM
Balmoral HydroClearTM
Key benefits Q Market leading pollutant removal level of 97%
Q 24 month service period reduces operating costs Q 6-50 pop options
Q Cost effective installation Q Virtually silent operation
Q Carries full CE accreditation to BS EN12566-3
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BALMORAL HYDROCLEAR 9
6
8
TM
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7 1
5 11 2
3
4 12
An aerated biological system, the HydroClear benefits from a moving bed biological reactor, or MBBR, at its core. A new process in the package wastewater market, MBBR technology embraces the benefits of common fixed film media processes without suffering their common downfalls.
Overgrowth of bacteria leading to ‘channelling’ is an issue with common process designs such as submerged aerated filters (SAF), rotating biological contactors (RBC) or trickling filter (TF) designs.
How does it work?
The Balmoral HydroClear system incorporates a full size three chamber design, ie, primary settlement, aeration chamber and final settlement.
Within the primary settlement chamber, large solids are removed by settlement and flotation. An accumulation forms at the base of the tank and is removed annually or biennially by desludging.
The clarified water then passes to the biological reactor where it is treated to remove the dissolved constituents. Mobile media elements support large bacterial populations within the reaction chamber while induced air promotes complete mixing ensuring that full treatment is achieved.
Unlike conventional media beds, MBBR systems are self cleaning and unable to become blocked through channelling. Media interactions produce a sloughing effect that removes excess bacteria thus ensuring continuous regrowth, optimising overall reactor efficiency.
The treated effluent and sloughed off bacteria flows into the final settlement chamber where any remaining small solids are removed prior to the clarified effluent being discharged from the plant.
1 110-160mm inlet depending on model 2 Primary settlement chamber 3 Aeration chamber 4 Final settlement chamber 5 110-160mm outlet depending on model 6 160mm capped lid: desludge point 7 Electrical isolator switch 8 Air compressor with warning system (240V) 9 760mm manway lid: bolted down and sealed 10 160mm capped lid: desludge point 11 Bio media 12 Bubble diffuser
Design features
Q Class-leading performance The HydroClear produces an astonishing market leading pollutant removal level of 97%. Carrying full CE accreditation to BS EN12566-3, final values are achieved for BOD, SS and NH4-N of 10:13:6mg/l respectively.
Q Lower operating costs With its unprecedented 24month service period and enhanced capacities the HydroClear can dramatically reduce long term operating costs. This is achieved through the inherent reliability of the simple but effective design rather than using complex systems that require frequent maintenance and desludging to achieve optimum performance.
Q Easy installation Further benefits are realised from the outset with optimised design characteristics meaning the 6-pop model can be installed using a 2.5-tonne mini-digger rather than the 7 or 12-tonne machines required for traditional plants. These design values are reflected across the entire HydroClear range resulting in simple, cost effective installation with minimal damage to the surrounding area.
Q Power failure default Even if the power fails the HydroClear will continue performing as a septic tank to ensure continued environmental protection.
Q Silence is golden High performance diaphragm blowers are used across the full range of HydroClears providing virtually silent operation.
Q Odour minimisation Hermetically sealed and market leading performance means the HydroClear effectively combats odour production.
Q 6-50-pop options The HydroClear is available in 6, 12, 30, 40 and 50-population models, in single or multitank designs, depending on size, offering a highly flexible solution to space-limited sites.
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Balmoral HydroClearTM Ø760mm
Ø760mm Access to air compressor
2450
1000
1050
Ground level
Inlet
Outlet
Max width 1250
3400
HC6
Specifications
Population served
1-6
Energy usage (kWh/day)
1.8
Organic load (g BOD5/day)
360
Outlet invert (mm)
1050
Max hydraulic load (l/day) NH3 (g/per day)
Total capacity (litres) Length (mm) Width (mm)
Height (mm)
Empty plant weight (kg)
2450
HC12
Ø760
Desludging interval
3400
12 months
Product code
1250
BHYD-6
Accreditation
2450 450
Ø760mm
Ø760mm
CE (BS EN 12566-3)
Access to air compressor Desludging point (160mm)
1050 Inlet
Outlet
Max width 1400
4500
24
Ø110
Lid size (mm)
4440
Desludging point (160mm)
1000
Pipework fitting (mm)
48
1000
Ground level
Inlet invert (mm)
1200
Specifications
Population served
7-12
Energy usage (kWh/day)
2.5
720
Outlet invert (mm)
1050
Max hydraulic load (l/day)
2400
NH3 (g/per day)
96
Organic load (g BOD5/day) Total capacity (litres) Length (mm) Width (mm)
Height (mm)
Empty plant weight (kg)
5950 4500 1400 2450 550
Inlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
1000 Ø110 Ø760
9 months BHYD-12
CE (BS EN 12566-3)
Balmoral HydroClearTM Ø760mm
Ø760mm
Desludging point (160mm)
Access to air compressor
2450
1050
1000
Ground level
Desludging point (160mm)
Inlet
Outlet
Max width 1400
Population served
13-20
Energy usage (kWh/day)
2.7
1200
Outlet invert (mm)
1050
Max hydraulic load (l/day)
4000
NH3 (g/per day)
160
Organic load (g BOD5/day)
Total capacity (litres)
7960
Width (mm)
1400
Length (mm)
Height (mm)
Empty plant weight (kg)
Ø760mm
Lid size (mm)
Desludging interval Product code
Accreditation
2450 700
Desludging point (160mm)
Rodding point
Ø110 Ø760
6 months BHYD-20
CE (BS EN 12566-3)
Ø760mm
Access to air compressor Desludging point (160mm)
Inlet
HC30
2450
Pipework fitting (mm)
1000
1050
Desludging point (160mm)
Inlet invert (mm)
5680
1000
Ground level
Specifications
1050
HC20
5680
Outlet
600 min distance between tanks
4500
Primary tank
Max width 1400
4500
Aeration/final settlement tank 9600 min overall length
Specifications
Population served
21-30
Energy usage (kWh/day)
3.6
1800
Outlet invert (mm)
1050
Max hydraulic load (l/day)
6000
NH3 (g/per day)
240
Organic load (g BOD5/day) Total capacity (litres)
11410
Width (mm)
1400
Overall length (mm) Height (mm)
Empty plant weight (kg)
9600 (minimum) 2450 1030
Inlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
1000 Ø160 Ø760
6 months BHYD-30
CE (BS EN 12566-3)
Note: The HC30 can be installed in line or side by side as conditions dictate
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Balmoral HydroClearTM
1000 2450
Rodding point
Access to air compressor Desludging point (160mm) 1050
Desludging point (160mm)
Ø760mm
1050
Desludging point (160mm) Ground level
Ø760mm
Inlet
Outlet
600 min distance between tanks
4500
5680
Primary tank
Max width 1400
Aeration/final settlement tank
HC40
10780 min overall length
Specifications
Population served
31-40
Energy usage (kWh/day)
5.2
Organic load (g BOD5/day)
2400
Outlet invert (mm)
1050
Max hydraulic load (l/day)
8000
NH3 (g/per day)
Inlet invert (mm)
320
Total capacity (litres)
Pipework fitting (mm)
14920
10780 (minimum)
Overall length (mm)
Width (mm)
1400
Height (mm)
2450
Empty plant weight (kg)
1000 Ø160
Lid size (mm)
Ø760
Desludging interval
6 months
Product code
BHYD-40
Accreditation
1190
CE (BS EN 12566-3)
Note: The HC40 can be installed in line or side by side as conditions dictate
Desludging point (160mm) Rodding point
1000
Desludging point (160mm)
Ø760mm
Rodding point
1050
Ground level
2450
Access to air compressor
Ø760mm
1050
Ø760mm
1050
Desludging point (160mm)
Inlet
Outlet
5680
600 min distance between tanks
600 min distance between tanks
4500
Primary tank
Aeration tank
3400
Final settlement tank
HC50
14780 min overall length
Specifications
Population served
41-50
Energy usage (kWh/day)
5.7
3000
Outlet invert (mm)
1050
Max hydraulic load (l/day)
10000
NH3 (g/per day)
400
Organic load (g BOD5/day) Total capacity (litres) Overall length (mm)
Width (mm)
Height (mm)
Empty plant weight (kg)
18400
14780 (minimum) 1400 2450 1590
Inlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
Note: The HC50 can be installed in line or side by side as conditions dictate
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Max width 1400
1000 Ø160 Ø760
6 months BHYD-50
CE (BS EN 12566-3)
Desludging intervals
Operating cost calculator
A number of products on the market state 12-month desludging intervals, similar to the HydroClear 6-pop. However, the primary settlement capacities of some of these products could be smaller than the HC6 by as much as 66%. Unless accounted for by special process design this can result in desludging being required three times more frequently than the HydroClear. Similar circumstances may also be found in ranges above 6 pop.
Visit balmoralhydroclear.com to compare the life cycle costs of alternative products with the Balmoral HydroClear.
Using the Balmoral sludge gauge, end-users can accurately measure sludge build up. Where reduced loadings exist, the HydroClear can operate safely with longer desludging intervals in comparison to similar sized products.
Servicing
The Balmoral HydroClear has been specifically designed to operate round a 24-month service interval; one of the longest available in the market. The simplicity of the system also gives the end-user an option to service their plant using accredited engineers or perform a self service using Balmoral supplied kits. Either choice means paying less in service costs over the product’s lifetime.
Balmoral HydroClear 6-pop 10 year maintenance costs End of year one Two-yearly service by owner Two-yearly desludge Total first year cost
£ NR NR 0
£ 200 200 400
Annual engineer service Annual desludge Total first year cost
200 200 800
Annual engineer service Annual desludge Cumulative two year costs
0 0 250
200 200 1200
Annual engineer service Annual desludge Cumulative three year costs
50 200 500
200 200 1600
Annual engineer service Annual desludge Cumulative four year costs
End of year two Two-yearly service by owner (service kit) 50 Two-yearly desludge 200 Cumulative two year costs 250
End of year three Two-yearly service by owner Two-yearly desludge Cumulative three year costs End of year four Two-yearly service by owner Two-yearly desludge Cumulative four year costs
Cumulative six year costs Cumulative eight year costs Cumulative ten year costs
Cumulative servicing costs (£)
4,000
Comparable treatment plant 10 year maintenance costs
750 1000 1250
2400 3200 4000
Cumulative six year costs Cumulative eight year costs Cumulative ten year costs
Life cycle costs: HydroClear v Comparable treatment plant
3,500
t le rab a mp Co
3,000 2,500
t rea
nt me
nt pla
2,000 1,500 1,000
Balmoral HydroClear
500 0
0
1
2
3
4
5
6
Plant lifetime (years)
7
8
9
10
It has been assumed that the desludge interval for the HydroClear will be twice as long as the comparable product and self servicing will be carried out on the HydroClear every two years. The HydroClear’s actual desludge interval may be longer than this depending on usage.
27
BALMORAL SBR Sequential Batch Reactor
Balmoral SBR
Key benefits Q Controlled batching of water treatment provides unrivalled effluent quality
Q Bespoke designs available to meet specific flow and load requirements Q Completely separate control kiosk houses a modern PLC control system
Q No high voltage electrics within the tanks providing a safe design Q Internal venting pipework
Q Tested and approved by the BBA (Cert. no. 01/3786) and Irish Agrément Board (Cert. no. 02/0150)
29
BALMORAL SBR Sequential Batch Reactor
12
11
Maximum level
The Balmoral Sequential Batch Reactor (SBR) combines the efficiency of activated sludge aeration with batch treatment to provide exceptional effluent quality even under extreme loadings.
In common with all Balmoral products, no compromise is made with regard to quality or design and the advanced technology and materials used in the manufacture of the SBR will ensure a lifetime of reliable service with the very minimum of maintenance.
The Balmoral SBR has been designed and built by Balmoral Tanks in association with the University of Abertay, Dundee, Waste Water Technology Centre, who acted as external consultants. The university carried out an in-depth test programme during which the SBR was tested and evaluated alongside a leading competitors model.
The aim of the development programme was to design a unit which was not only very robust and reliable but which would provide outstanding effluent quality without the need for expensive “add on” equipment and would also overcome technical problems - (such as peak surges through the bio-zone), which most current designs have failed to adequately address. The final report from the WWTC confirms that the Balmoral SBR out-performs its rivals in almost every respect and that it has the capability to meet even the most onerous effluent requirement.
How does it work?
Crude wastewater enters the Primary Settlement Tank (PST) (2) where gross solids settle out and the supernatant liquor remaining near the surface can be drawn off. Substantial “buffer” storage volume is provided in the PST to cope with even the most extreme peak flow loadings (3). A set volume (or batch) of the liquor is transferred to the Reactor Vessel (RV) by an “air-lift” pump (4) where it is mixed and aerated by a powerful air bubble diffuser (5) for a period of 4 hours. During this aeration cycle efficient oxygen transfer cultures a dense “soup” of bacteria (the active sludge) which feeds on the sewage liquor thereby removing most of the organic pollutants. After aeration, the bubble diffuser is switched off and there is a settling period during which the dense activated sludge sinks to the bottom of the RV leaving behind the clarified effluent, (7) which is then discharged into the drain by a second “air-lift” pump (9). All functions within the tanks are operated by air power which is supplied by an electric air compressor and the system is controlled by an integrated programmable unit which monitors the process to take account of flow conditions.
Fill
8
9
Minimum level
1
10 7
Settled sludge level
3
6
4
2
1 2 3 4 5 6 7 8 9 10 11 12
5
110-160mm inlet depending on model Primary settlement chamber Buffer storage of 2/3 daily flow Air lift pump Bubble diffuser Activated sludge storage Clarified effluent Batch cycle volume of 1/3 daily flow Second air lift pump 110-160mm outlet depending on model Desludge point 600mm manway lid: bolted down and sealed
Design features
Q Unrivalled effluent quality
Q Reduces main pollutants including ammonia by 96% Q Batching system eliminates peak surges
Q Controlled by an integrated programmable control unit
Q Automatic “holiday mode” aeration cycle Q Powered by an air compressor
Q Safe - no 240 volt electrics within tanks
Q Very robust - one piece moulded polyethylene body Q Reliable - all components easily accessible
Q The Balmoral SBR is tested and approved by the British Board of Agrément (Cert. no. 94/3021) and the Irish Agrément Board (Cert no. 02.0150)
31
SBR6
Balmoral Sequential Batch Reactor
Height (mm)
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
48
3800 2045 3005 352
Population served
1240
Ø110 Ø760
12 months BSBR6
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
NH3 (g/per day)
96
Diameter (mm) Height (mm)
Empty plant weight (kg) Energy usage (kWh/day) Inlet invert (mm)
Outlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
32
7-12
2400
Total capacity (litres)
Outlet
1130
Max hydraulic load (l/day)
Organic load (g BOD5/day)
Inlet
2.16
SBR12 Specifications
1240
620 Service duct (Ø110mm)
Ø1275 Ø2045
Control kiosk
Desludging point
Ø760mm
Ground level
Service duct (Ø110mm)
720
6000 2365 3175 439
Inlet
Outlet
2.16 975
1085
Ø110 Ø760
12 months BSBR12
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
Ø1275 Ø2365
1085
Diameter (mm)
360
1200
620
Total capacity (litres)
1-6
1130
NH3 (g/per day)
Ground level
3005
Max hydraulic load (l/day)
Organic load (g BOD5/day)
Ø760mm
975
Population served
Desludging point
3175
Specifications
Control kiosk
Balmoral Sequential Batch Reactor Ø760mm
Rodding point
Control kiosk
Rodding point
Ø760mm
977
932
Ground level
Inlet
Fall between tanks approx 1 in 40mm
3005
Outlet
300
37
Ø1275
Ø2365
Primary tank
Aeration/final settlement tank
Specifications
SBR18
Ø1275
Ø2365
Population served
13-18
Energy usage (kWh/day)
13.3
1080
Outlet invert (mm)
977
Max hydraulic load (l/day)
3600
NH3 (g/per day)
144
Organic load (g BOD5/day)
Inlet invert (mm)
Total capacity (litres)
12000
Width (mm)
Ø2365
Overall length (mm)
Height (mm)
Empty plant weight (kg)
Ø760mm
Rodding point
932
Pipework fitting (mm)
5030 (minimum)
Ø110
Lid size (mm)
Ø760
Desludging interval
6 months
Product code
BSBR18
Accreditation
3005 587
Control kiosk
Rodding point
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
Ø760mm
SBR24
977
932
Ground level
Inlet
Fall between tanks approx 1 in 40mm
3005
Outlet
300
37
Ø1275
Ø2365
Primary tank
Aeration/final settlement tank
Specifications
Population served
19-24
Energy usage (kWh/day)
13.3
1440
Outlet invert (mm)
977
Max hydraulic load (l/day)
4800
NH3 (g/per day)
192
Organic load (g BOD5/day) Total capacity (litres)
12000
Width (mm)
Ø2365
Overall length (mm) Height (mm)
Ø1275
Ø2365
Empty plant weight (kg)
5030 (minimum) 3005 587
Inlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
932
Ø110 Ø760
6 months BSBR24
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
33
Balmoral Sequential Batch Reactor Rodding point
Pedestrian duty manhole cover
Control kiosk
Rodding point
Ø760mm
977
898
Ground level
Inlet
Outlet 3005
2824
Fall between tanks approx 1 in 40mm
370
275
SBR36
Ø1275
Rodding point
3050
Ø2365
Primary tank
Aeration/final settlement tank
Specifications
Population served
24-36
Energy usage (kWh/day)
13.3
Organic load (g BOD5/day)
2160
Outlet invert (mm)
977
Max hydraulic load (l/day) NH3 (g/per day)
Total capacity (litres) Overall length (mm) Width (mm)
Height (mm)
Empty plant weight (kg)
Pedestrian duty manhole cover
Inlet invert (mm)
7200
Pipework fitting (mm)
288
14000
5785 (minimum) Ø2365
Lid size (mm)
Desludging interval Product code
Accreditation
3005 747
Control kiosk
Rodding point
898
Ø110 Ø760
6 months BSBR36
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
Pedestrian duty manhole cover
921
1030
Ground level
Inlet 2824
Fall between tanks approx 1 in 40mm
Outlet
303
SBR48
59
34
3050
3050
Primary tank
Aeration/final settlement tank
Specifications
Population served
37-48
Energy usage (kWh/day)
13.3
2880
Outlet invert (mm)
1030
Max hydraulic load (l/day)
9600
NH3 (g/per day)
384
Organic load (g BOD5/day) Total capacity (litres) Overall length (mm)
Width (mm)
Height (mm)
Empty plant weight (kg)
16000
6403 (minimum) 2275 2824 906
Inlet invert (mm)
Pipework fitting (mm) Lid size (mm)
Desludging interval Product code
Accreditation
921
Ø110 Ø760
6 months BSBR48
BBA (Cert No. 01/3786) IAB (Cert No. 02/0150)
SBR +
Balmoral Tanks also designs and manufactures wastewater treatment plants for larger commercial and domestic applications. Please contact Balmoral Tanks to discuss your project requirements.
35
BALMORAL RAINWATER HARVESTING SYSTEMS
Balmoral rainwater harvesting systems 37
Balmoral rainwater harvesting systems
Balmoral rainwater harvesting systems reduce the demand for mains water provision. Many springs and rivers are naturally fed by groundwater and are important for wetlands and their ecosystems. More than 25% of groundwater sources are at risk because of abstraction pressures. By gathering and recycling rainwater, Balmoral’s harvesting systems reduce the volume of discharged rainwater and contribute to reduced flood risks. The loading on combined sewer overflows is also lowered resulting in improved river water quality. Balmoral offers two kinds of rainwater harvesting tanks for home and garden purposes:
Balmoral Home-Harvest Rainwater SystemTM - page 44 Designed for easy installation and reliable operation, each system provides the highest quality non-potable rainwater for toilet flushing, washing machines, garden irrigation and vehicle washing purposes. Balmoral Garden-Harvest Rainwater SystemTM - page 46 An easy to install, high performance and economic solution for the keen gardener providing free water, even during hosepipe bans, all year round.
Toilets 33.3% (harvestable)
Personal washing 33.3%
Gardens 6.1% (harvestable)
Direct heating systems 0.1%
Clothes washing 14% (harvestable)
Dishwashing 7.7%
Toilets 33.3% (harvestable)
Gardens 6.1% (harvestable)
Clothes washing 14% (harvestable) Car washing 0.7% (harvestable) Miscellaneous 13.1%
Car washing 0.7% (harvestable)
Total 45.8% harvestable Source: Environment Agency
Harvest around 50% of your water needs
The chart above shows the breakdown of water use in a typical household.
The Balmoral Home-Harvest and Garden-Harvest rainwater systems make it easy for you to gather and reuse this rainwater. Save on your water costs By recycling your rainwater, a Balmoral rainwater harvesting system can help save up to 50% of your metered water costs. Meters are provided free of charge from most water companies so the sooner you fit a Balmoral system the sooner you start saving. Balmoral Home-Harvest Rainwater SystemTM
Balmoral Garden-Harvest Rainwater SystemTM
39
What size of tank do you need?
The size of a rainwater holding tank must match the demand for water with its availability as closely as possible. The tank size chosen must be a balance between budget, storage capacity and the need to enable an overflow at least twice a year to flush out floating debris. The Environment Agency publication ‘Harvesting rainwater for domestic uses: an information guide’ provides an authoritative and independent means of calculating the optimum size of tank for household water use and suggests that 5% of the annual rainwater supply, or of the annual rainwater demand, is used to determine the optimum size of tank, using the lower figure of the two.
What is your annual rainwater supply? Tank size (litres)
Example
=
Catchment area m2
=
5,265 litres
130m
2
x x
Drainage coefficient 0.8
Catchment area Is the width and length of your roof in m2. Remember you do not have to collect water from the entire roof. This can help to reduce installation costs.
x
0.9
x Annual rainfall mm
x
1125mm
x
5%
x 5%
Drainage coefficient It is difficult to collect every drop of rain that falls on your roof. Light rainfall will only wet your roof and then evaporate and heavy rainfall can overflow gutters. A drainage coefficient is used to adjust the tank size calculation to allow for this.
Annual rainfall This can vary dramatically over a relatively small area, so a reading (in mm) within 10 miles of the property is preferable. The local Environment Agency or the Met Office can supply rainfall data or you can use the regional guide figures we have provided in the table below. In the ‘annual rainwater supply example’ above we have used the average figure for the UK.
Filter efficiency During initial rainfall some rainwater will skim over the filter, clearing away any debris. During heavy flow some rainfall will also bypass the filter to overflow ensuring that the filter is not overloaded. 90% of rainfall is caught, therefore the Balmoral filter coefficient is 0.9.
5% is a constant percentage factor
Roof type Pitched roof tiles Flat roof smooth tiles Flat roof with gravel layer
Drainage coefficient 0.75-0.9 0.5 0.4
What is your annual rainwater demand?
Tank size (litres)
Example
=
Average usage
=
5,015 litres
=
150 litres
Average usage On average, each person in the UK uses around 150 litres of water every day and 45.8% of this total could be rainwater instead of mains water. 40
x Filter efficiency
x
x
Region UK S England N England Wales Scotland NI EIRE E EIRE W
people in household 4
x
x
Average rainfall (mm) 1125 781 944 1433 1520 1111 875 (Source: Irish Met service) 1125
days/year 365
x x
% harvestable 45.8%
x
x
5% 5%
What is the right tank for you?
Balmoral produces four tanks for domestic use so all you need to do is select the tank that best suits your needs. To help you we have calculated the correct size of tank for you based on your annual rainwater supply and your annual rainwater demand. Select the tank size from either table and if they indicate different tank sizes then you should choose the smaller of the two. These tables have been produced using the average annual rainfall for the region and assumes a pitched roof with a conservative drainage coefficient of 0.8. If your roof area is beyond the capacity of our largest tank or if the number of people indicates a smaller tank than your roof area will collect, then this is acceptable as it will mean that the tank will overflow more often, flushing out any floating debris.
Tank size calculator
Calculate the size of tank required using the ‘Rainwater supply’ and ‘Rainwater demand’ tables below then select the smaller of the two tank sizes.
140
170
180
190
200
210
220
230
BST-60
BST-45
160
BST-60
BST-38
150
BST-60 4
5
BST-60
BST-45
BST-45 BST-45
3
130
BST-60
120
BST-45
110
BST-38 2
BST-60
BST-27
1
100
BST-38 BST-45 BST-45 BST-38
Number of people
BST-38
Rainwater demand
Tank
90
BST-38
BST-38
BST-27
ROI West
BST-27
BST-27
ROI East
Region
80
BST-27 BST-27
Scotland
Northern Ireland
70
BST-38
Wales
BST-27
North England
60
50
BST-27
South England
Roof size m2
BST-60
Region
BST-60
Rainwater supply
6+
Balmoral tank sizes BST-27
BST-38
BST-45
BST-60
41
The ultimate underground rainwater harvesting tank
Balmoral rainwater tanks are produced in four sizes, ie, 2728, 3800, 4546 and 6000 litres, and are rotationally moulded in tough polyethylene which offers a very high level of impact resistance.
Design features
Q High impact strength at low temperatures
Q Stress free mouldings provides extra strength Q Leak proof, single piece moulding Q Lightweight, easy to handle
Q Corrosion resistant
Q Low maintenance Q UV protected
Q Recyclable
42
By recycling your rainwater, a Balmoral rainwater harvesting system can help save up to 50% of your metered water costs
How does it work?
Home-Harvest system Please read in conjunction with the illustration on page 44.
A wall-mounted pump (1) draws water from the system to provide clean water for refilling a toilet cistern or for using with a washing machine. The guided suction line (4) allows the pump to provide the cleanest possible water from the tank. Garden-Harvest system Please read in conjunction with the illustrations on page 46.
A submersible pump (1) mounted within the rainwater harvesting system is connected to a garden water tap. A timer switch (6) allows the user to set specific periods of use. When this period expires the pump will switch off automatically.
43
Balmoral Home-Harvest Rainwater SystemTM
1
B
A
C
5 E
C D
2
4
1
Fully insulated cover 10 litre break tank with air gap
Easy access to all electro-mechanical parts Simpler installation No loss of service. Does not refill tank from mains so less pipework and wasted water Quiet operation Meets water regulations
Filter assembly Lift out 0.2mm stainless steel filter Self cleaning filter Located within tank Overflow skimmer with U-bend overflow 90% water yield
Improved water quality Low maintenance Saves space. Easier installation and access Improved water quality Saves more water
3
3
Calmed inlet Minimises disturbance of settled matter
Improved water quality
4
Guided suction pipe Unique precision guided system ensures that water is taken only from the cleanest part of the tank Additional filter on suction inlet Precisely locates the tank low level sensor
4
2
5
44
Pump control unit Located inside the house No pump in the tank Auto mains water backup
Pump control unit Filter assembly Calmed inlet Guided suction pipe Telescopic turret Mains bypass connection Appliance connection Suction line Inlet Inlet overflow
External pipework A, B, C, D and E are not supplied as part of the tank package
3
1
1 2 3 4 5 A B C D E
Telescopic turret Adjustable height
2
Improved water quality Improved water quality Minimises wasted water
Minimises installation depth. Allows a neat flush finish with the ground
5
Balmoral Home-Harvest Rainwater SystemTM
Ø760mm
Reduced invert cut line
Inlet
900
840
Ground level
Height
Inlet overflow
Filter assembly
Guided suction intake c/w one-way valve and filter
Minimum water level sensor controls automatic mains back-up
Calmed inlet
Footprint Ø Diameter Ø
Specifications
Balmoral Home-Harvest Rainwater Tank BST-27-HH
BST-38-HH
BST-45-HH
BST-60-HH
Population served
1
2
3
4+
Diameter (mm)
Ø1840
Ø2045
Ø2165
Ø2365
Capacity (litres)
2700
3800
4546
6000
Height (mm)
2400
2640
2770
3005
Empty plant weight (kg)
190
230
260
310
Inlet invert (mm)
840
840
840
840
Footprint (mm)
Energy usage* (kWh/day)
Ø1275 0.25
Ø1275 0.25
Ø1275 0.25
Ø1275 0.25
Inlet overflow (mm)
900
900
900
900
Lid size (mm)
Ø760
Ø760
Ø760
Ø760
Pipework fitting (mm) Filter checking interval
Product code
Ø110
2 months
BST-27-HH
Ø110
2 months
BST-38-HH
Ø110
2 months
BST-45-HH
Ø110
2 months
BST-60-HH
* Based on one-person average usage
45
Balmoral Garden-Harvest Rainwater SystemTM
6
A
5 C
B
2
1 2 3 4 5 6 A B C
4
1
3
Submersible pump Filter assembly Calmed inlet Guided suction pipe Telescopic turret IP rated switch Mains bypass connection Appliance connection Suction line
External pipework A, B and C are not supplied as part of the tank package
1
1
46
Submersible pump
Pump located in tank High power pump Remote On/Off switch
Self contained easy installation High flow over long hose length Convenient and simple operation
Lift out 0.2mm stainless steel filter Self cleaning filter Located within tank Overflow skimmer with U-bend overflow 90% water yield
Improved water quality Low maintenance Saves space. Easier installation and access Improved water quality Saves more water
Minimises disturbance of settled matter
Improved water quality
Adjustable height
Minimises installation depth. Allows a neat flush finish with the ground
2
Filter assembly
3
Calmed inlet
4
Telescopic turret
2
3
4
Balmoral Garden-Harvest Rainwater SystemTM
Ø760mm
900
840
Ground level
Reduced invert cut line
Inlet
Height
Inlet overflow
Filter assembly
114 ” delivery hose
Stainless steel submersible pump c/w float valve
Calmed inlet
Footprint Ø Diameter Ø
Specifications
Balmoral Garden-Harvest Rainwater Tank BST-27-GH
BST-38-GH
BST-45-GH
BST-60-GH
Population served
1
2
3
4+
Diameter (mm)
Ø1840
Ø2045
Ø2165
Ø2365
Capacity (litres)
2700
3800
4546
6000
Height (mm)
2400
2640
2770
3005
Empty plant weight (kg)
180
220
250
300
Inlet invert (mm)
840
Footprint (mm)
Energy usage* (kWh/day)
Ø1275
Ø1275
Ø1275
Ø1275
1
1
1
1
Inlet overflow (mm)
900
900
900
900
Lid size (mm)
Ø760
Ø760
Ø760
Ø760
Pipework fitting (mm) Filter checking interval
Product code
Ø110
12 months
BST-27-GH
840 Ø110
12 months
BST-38-GH
840 Ø110
12 months
BST-45-GH
840 Ø110
12 months
BST-60-GH
* Based on one-person average usage
47
WATER STORAGE
Water storage
Reference should be made to the following • WRAS Water Regulations Guide ISBN 0-9539708-0-9 • Grants are available up to £800 from local authorities (Scotland only) For more information visit www.privatewatersupplies.gov.uk • Information and Guidance Note document (IGN No. 9-04-04) “Cold Water Storage Cisterns - Design Recommendations for Mains Supply Inlets” • www.defra.co.uk
49
Potable and non-potable water storage tanks
Balmoral’s rotationally moulded water tanks comply fully with United Kingdom water regulations.
The tanks are suitable for many applications and are provided with moulded-in areas for different types of fittings to be attached as required.
The above ground tanks can be used for mains supplied potable water. The underground models should only be specified for non-mains supplied water or indirect mains supplied water.
Tank features
Q Suitable for agricultural, commercial and domestic use
Q 500mm diameter access points
Q Moulded in features to accept inlets, volume indicators, etc
Q UV stabilised material Q Corrosion resistant
Q Lightweight, one-piece construction
Above ground water storage
Agricultural and commercial water storage
Balmoral water storage tanks are widely used in the agricultural and commercial sectors as a cost-effective solution for mains supplied and non-mains supplied water storage. Typical uses for water storage tanks in these sectors include rainwater harvesting, fire-fighting systems, cleaning systems, water bowsers, sanitation and domestic facilities.
Domestic water storage
To reduce the risk of water contamination in domestic situations, Balmoral water tanks must be installed in accordance with UK water regulations with particular reference being paid to Water Regulations Advisory Scheme (WRAS) Water Regulations Guide.
Underground water storage
For private water supplies, advice should be sought from the relevant authority on the correct type of installation should the water supply be subject to local controls.
Installation of a Balmoral water storage tank for domestic purposes must follow WRAS guidelines to reduce the risk of water contamination and provide a hygienic water supply. This may require additional fittings (see page 52) conforming to Schedule 2, section 7, paragraph 16 of the WRAS Water Regulations Guide (previously referred to as Byelaw 30 and Byelaw 60). These additional fittings should only be fitted when tanks are for indoor use. If in doubt, refer to WRAS Water Regulations Guide or contact your local authority. Emergency water storage
For private water supplies the user should obtain advice on the correct type of installation from the relevant authority if the water supply is subject to local regulations or controls.
51
Optional fittings
Location of G16.13 kit Horizontal tank
Balmoral G16.13 kit
A Balmoral water storage tank G16.13 kit contains the following items: a 3/4” Warning pipe breather Tank fittings for up to 1” inlet a
3/4” warning pipe
c
2” overflow
•
Instruction leaflet
b d
1 1/2” screened breather 2” tank connector
or Tank fittings for over 1” inlet a
3/4” warning pipe
c
2 x 2” overflows
•
Instruction leaflet
b d
1 1/2” screened breather
b breather
a warning pipe c/d overflow level
b 1 1/2” screened breather
c 2” overflow
d 2” tank connector
2 x 2” tank connectors
UK water regulations
Water regulations, “The Water Supply (Water Fittings) Regulations 1999” in England and Wales and “The Water Byelaws 2000, Scotland”, replaced the previous regional Water Byelaws which were seen to be outmoded, restrictive and out of step with the rest of the world in terms of water management and health and safety. Fundamentally, the Water Byelaws 2000, Scotland, mirror the regulations adopted for England and Wales as do those which apply in Northern Ireland.
To assist in a greater understanding of the regulations, the Water Regulations Advisory Scheme (WRAS) published its Water Regulations Guide early in 2001.
Guidance summary
The following guidance is a summary aimed at providing an initial assessment of the contamination risk and the design measures required to remain regulation compliant.
At the outset the water suppliers’ consent must be obtained before work starts on any proposed installation. Failure to do so could result in criminal prosecution. The regulations classify water quality into five categories. They range from Fluid Category 1, classed as “wholesome” water (straight from the tap as supplied by the water undertaker) to Fluid Category 5, fluid representing a serious health hazard (grey water recycling cisterns, abattoir supplies, etc).
52
Inlet level (Inlet not supplied)
Under the old Byelaws classification, Fluid Category 1 was termed “water for domestic purposes” or “potable water”. With five Fluid Categories the appropriate safeguards to be selected for a given application may seem a bit daunting, however the Information and Guidance Note document (IGN No. 9-04-04) entitled “Cold Water Storage Cisterns – Design Recommendations for Mains Supply Inlets” acts as a quick guide to simplify the choices.
Vertical tank b breather
Inlet level (Inlet not supplied) a warning pipe c/d overflow level
Any cold water storage cistern or tank together with its fittings requires to be constructed of materials conforming to regulation requirements. Balmoral tanks are compliant with the WRAS Regulator’s Performance Specifications.
Certain basic design parameters are applicable: a The overflow pipe, inclusive of any insect screen, if fitted, shall be capable of draining the maximum inlet flow without compromising the inlet air gap b For cisterns of less than 1000 litres actual capacity the overflow/warning pipe diameter shall not be less than 19mm and to ensure air gap compliance is recommended to be sized at twice the diameter of the inlet pipe.
Cisterns greater than 1000 litres actual capacity require both an overflow and a warning pipe/warning device. The minimum recommended warning pipe diameter is 25mm with the overflow sized at twice that of the inlet diameter. (Or the equivalent diameter sized at twice the summation of inlet pipe bore areas for tanks with multiple inlets).
Most cisterns store wholesome water used in part, at least, for domestic purposes irrespective of other downstream system uses. Given those circumstances the cistern must then comply with Clause G16.13 of the Government Guidance as depicted in Figure 1. Screened air inlet Securely fixed access cover
Float valve
Sleeve for vent pipe Straight or dipped entry to warning pipe
Warning pipe and/or overflow screen Insulation against frost and undue warming
Figure 1
Fluid Categories 1-4
A simplified yet no less compliant approach to cistern design and application is to consider only the implications required to meet either Fluid Category 4 or 5 requirements.
Any cistern encompassing cistern design features, advised in Figure 1, and incorporating a Type AF Air Gap on its inlet/s will encompass fully the backflow protection requirements necessary for Fluid Categories 1-4 with little or no penalty in lost storage capacity. The general thinking behind this recommended approach is that it’s better to be safe than sorry. It is considered there are greater inherent risks associated with larger and more complex water supply systems when limited information may be available. This design approach, which covers approximately 90% of all cistern installations, provides for greater uniformity of application throughout the water supply industry. Figure 2 sets out the relative positions of a cistern’s inlet device relative to its warning pipe, overflow and normal top water level for a Type AF air gap requirement.
Figures 3-5 illustrate, for various cistern capacities, the recommended plumbing arrangements compliant with providing Type AF Air Gap protection applicable for cisterns installed in domestic and commercial applications. Air gap 2 x inlet dia
INLET
25mm minimum
Air gap 2 x inlet dia
Warning pipe/ overflow
CRITICAL WATER LEVEL Overflow
25mm minimum
SHUT OFF LEVEL
Warning pipe
25mm minimum
Figure 3: Cistern < 1000 litres
NORMAL TOP WATER LEVEL
Air gap 2 x inlet dia
25mm minimum
Figure 2 Overflow pipe
SHUT OFF LEVEL
Balmoral tanks are compliant with the WRAS Regulator’s Performance Specifications
Warning pipe 25mm minimum
Figure 4: Cistern 1000-5000 litres Level at which audible or visible alarm is activated
Air gap 2 x inlet dia
Overflow pipe SHUT OFF LEVEL
50mm minimum between invert of overflow pipe and shut off level
Figure 5: Cisterns > 5000 litres Occasions can arise within commercial and industrial premises where the protection provided by a Type AF Air Gap is not adequate to cover the contamination risk of a Fluid Category 5 application. In these circumstances a higher degree of protection must be adopted.
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Fluid Category 5
The Regulations advise that a Type AB Air Gap must protect mains water supplies to any cistern installation providing storage for applications defined as a Fluid Category 5.
For closed top cisterns, Type AB Air Gap protection is required incorporating the use of a Weir Spill Slot in the cistern sidewall to act as the emergency overflow. Figure 6 advises the basic cistern configuration to meet this requirement.
Air gap 2 x inlet dia
Overflow pipe Weir spill slot unscreened
Head over weir Warning pipe 25mm minimum
Figure 6: Similar to old Type A Air Gap The specific design details of a Type AB Air Gap is identified in BSEN 13077: 2003 “Devices to prevent pollution by backflow of potable water – Air gap with non circular overflow (unrestricted) – Family A, type B”. It is acceptable to have the slot opening screened provided the size of the slot is increased in proportion to the obstruction imposed by the installation of the screening material.
Summary
Most cistern applications, whether domestic, commercial or industrial, can be accommodated by the adoption of Type AF Air Gap protection to the mains inlet supply.
Cistern applications, which in part at least require the stored water to supply an industrial process, laboratory, etc, can be accommodated by adopting Type AB Air Gap protection to the mains inlet supply. Additional information on determining the classification of a fluid category is obtained from the WRAS IGN publication number 9-04-04.
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LP1250
Balmoral water storage tanks
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
V1800
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
H3500
1250 1800 1320 915 BWST-LP1250
1800 1400 1400 1500 BWST-V1800
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
3500 2800 1700 1326 BWST-H3500
V1365
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
V2600
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
V3635
1365 1300 1300 1320 BWST-V1365
2600 1580 1580 1665 BWST-V2600
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
3635 1800 1800 1778 BWST-V3635 55
Balmoral water storage tanks
V5455
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
V10000
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
UG2410
10000 2330 2330 2920 BWST-V10000
Underground tank for non-mains supplied or indirect mains supplied water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code 56
5455 2000 2000 2100 BWST-V5455
2410 2350 1350 2171 BWST-UG2410-B2
V7270
Above ground tank for mains supplied and non-mains supplied potable water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
UG1370
Underground tank for non-mains supplied or indirect mains supplied water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
UG3090
7270 2085 2085 2426 BWST-V7270
1370 1900 1150 1969 BWST-UG1370-B1
Underground tank for non-mains supplied or indirect mains supplied water storage
Capacity (Litres) Length (mm) Width (mm) Height (mm) Product code
3090 3200 1350 2171 BWST-UG3090-B3
Balmoral Hydrostack The Balmoral Hydrostack has been specifically designed for the supply of water in emergency situations. These tanks are ideally suited for use in situations such as water shortages due to summer droughts, burst water pipes or Water Authority maintenance periods where supply is temporarily “cut-off”. The tanks are rotationally moulded in black polyethylene material and incorporate the following features: Q Unique stackable design for safe, economical storage Q High level of security and anti-vandalism features Q Integral plinth
Q Elevated hygiene characteristics, including guards to protect taps Q Drainage system capable of draining tank fully after cleaning
Q Manufactured from WRAS approved materials Q Low maintenance
Q Forklift slots and lifting eyes for ease of handling
Ø600mm rotomoulded lid
779
1740
1895
Tank
555
Integral plinth
517 Ø1584
Specifications Capacity (Litres) Diameter (mm) Height (mm) Plinth height (mm) Lid (mm) Tank colour Product code Accreditation
1150 1584 1895
9 R7
2
779
Ø600
Black BWST-HYSK-BLK WRAS approved
(Cert No. 0605132)
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BALMORAL TANKS www.balmoraltanks.com
Balmoral Tanks 59
Balmoral Tanks Ltd
Balmoral Tanks Ltd, a division of Balmoral Group Holdings Ltd, is a leading European engineering design and manufacturing company. As a result of significant investment in people and plant, the company produces what is believed to be the most comprehensive range of tank products available from a single source in the EU.
Civil engineering, wastewater treatment, drainage, fuel oil containment, bulk liquid and potable water storage sectors are all key sectors for the company.
Visit balmoraltanks.com for a comprehensive overview of the company and its products. Other Balmoral Tanks products Q Wastewater treatment plant Q Rainwater harvesting systems Q Bulk liquid storage Q Chemical storage Q Potable/non-potable water storage Q Fuel oil storage and dispensing Q Trade moulding Q GRP sectional water storage Q Steel sectional water storage
The Balmoral name has become a brand in its own right, synonymous with product development, technical excellence and manufacturing efficiency.
Balmoral Group
Balmoral Group Holdings Ltd is a privately owned business headquartered in Aberdeen, UK, and has been providing solutions to the civil and environmental, building and energy sectors since 1980.
The enterprise has been built upon research, development and technical innovation. It is this commitment to progress that has helped the company achieve its status as a market leader in its chosen fields of operation. The company has, for a number of years, successfully operated manufacturing processes at Balmoral Park which are approved and strictly regulated by the Scottish Environment Protection Agency under Part B of the Environmental Protection Act 1990. Quality Assurance Balmoral Tanks Ltd is certified to BS EN ISO 9001. The company’s QA manuals are available for examination by all clients.
Balmoral Tanks
www.balmoraltanks.com
61
Balmoral Tanks
BALMOR AL TANKS HEAD OFFICE AND FACTORIES
Balmoral Park, Loirston, Aberdeen AB12 3GY, Scotland Tel +44 (0)1224 859000 Fax +44 (0)1224 859123
Email
[email protected] www.balmoraltanks.com
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