250mld wtp

DESIGN OF WATER TREATMENT PLANT Entered Discharge Q in mld

= 250.00 mld

AREA REQUIREMENT OF THE PLANT Entered Discharge Q

= 250.00 mld

Area requirement of the plant = 4.479 Hectares Area requirement of the plant = 44793.80 square m for the given 250.00 mld plant. DESIGN OF CASCADE AERATOR Entered Discharge Q in mld Entered Rise of each step in m [ 0.2 To 0.3 m ] Entered Number of steps [ 4 To 6 ] Entered Inlet Velocity in m/sec [ 1.2 To 1.8 m/sec ]

=250.00 mld = 0.25 m = 5.00 = 1.00 m/sec

Number of Aerator= 2.00 Discharge of each aerator=125.00 mld Area Requirement= 0.028 square m/cubic m/hr Inlet velocity= 1.00 m/s Diameter of inlet pipe= 1.36 m Diameter of aerator= 14.99 m Width of each step= 1.36 m Rise of each step= 0.25 m Depth of aerator= 1.25 m Depth of water in collecting channel= 0.92 m Total Depth of water in collecting channel= 1.07 m DESIGN OF RECTANGULAR CHANNEL FROM AERATOR TO PARSHALL FLUME Entered Discharge Q = 250.00 mld Entered length of rectangular channel in m = 40.00 m Entered velocity of rectangular channel in m/s [ 1 To 1.8 m/s ] = 1.00 m/s Number of Rectangular channel= 2.00 Discharge of each Rectangular channel=125.00 mld Length of Rectangular channel= 40.00 m Velocity of Rectangular channel= 1.00 m/s Depth of Rectangular channel= 0.96 m Total Depth of Rectangular channel= 1.11 m Width of Rectangular channel= 1.50 m Slope of Rectangular channel= 1 : 1862 DESIGN OF PARSHALL FLUME Entered Discharge Q

= 250.00 mld

Number of Parshall flume= 2.00

Discharge of each Parshall flume=125.00 mld Total depth of flow in upstream leg of the flume at one third point= 1.86 m Throat width of the flume(W)= 300 mm Throat length of the flume(F)= 600 mm Width at diverging end(C)= 600 mm Width at converging end(DF)= 831 mm Length of diverging part(G)= 900 mm Length of converging part(B)=1322 mm DESIGN OF DISTRIBUTION CHAMBER BEFORE FLASH MIXER Entered Discharge Q = 250.00 mld Entered depth of distribution chamber in m [ 2 To 3.5 m ] = 3.00 m Number of distribution chamber= 2.00 Discharge of each distribution chamber=125.000 mld Number of rapid mix unit= 4.00 Discharge of each rapid mix unit= 62.500 mld Diameter of distribution chamber= 6.07 m Depth of distribution chamber= 3.0 m Total Depth of distribution chamber= 3.5 m DESIGN OF RAPID MIX UNIT Entered Discharge Q

= 250.00 mld

Entered Detention time in sec [ 20 To 60 sec ] = 40.00 m/s Entered Inlet Velocity in m/s [ 0.9 To 1.8 m/s ] = 1.00 m/s Entered Outlet Velocity in m/s [ 0.6 To 1.8 m/s ] = 0.90 m/s Entered Number of blades [ 2 To 6 ] = 4.00 Number of Rapid mix unit= 4.00 Discharge of each Rapid mix unit= 62.500 mld Ratio of Tank height to diameter= 1.50 Detention Time of Tank= 40.00 sec Diameter of Tank= 2.91 m Height of Tank= 4.36 m Total Height of Tank= 4.56 m Power Spent= 5911.00 watts Power per unit Volume=205.00 watts per cubic m Power per unit flow of water= 2.27 watts per cubic m per hr Diameter of Impeller= 1.16 m Radius of Impeller= 0.58 m Rotational speed of Impeller=100.00 rpm Velocity at the tip of the Blade= 6.09 m/s

Relative Velocity of Blade= 4.56 m/s Number of Blades= 4 Width of each Blade= 0.05 m Depth of each Blade= 0.35 m Diameter of Inlet Pipe= 0.96 m Diameter of Outlet Pipe= 1.01 m DESIGN OF DISTRIBUTION CHAMBER BEFORE CLARIFLOCCULATOR Entered Discharge Q = 250.00 mld Entered depth of distribution chamber in m [ 2 To 3 m ] = 3.00 m Number of distribution chamber= 4.00 Discharge of each distribution chamber= 62.500 mld Number of clariflocculator = 8.00 Discharge of each clariflocculator= 31.250 mld Diameter of each distribution chamber= 4.29 m Depth of each distribution chamber= 3.0 m Total Depth of each distribution chamber= 3.5 m DESIGN OF CLARIFLOCCULATOR Entered Discharge Q

= 250.00 mld

Entered Velocity of flow through inlet pipe in m/s [ 1 To 1.5 m/s ] = 1.00 Entered Velocity through ports in m/s [ 0.2 To 0.8 m/s ] = 0.50 Entered Detention Time of Flocculation Basin in min [ 20 To 40 min ] = 30.00 Entered Depth of Flocculation Basin in m [ 3 To 4.5 m ] = 4.50 Entered Number of blades [ 4 To 12 ] = 8.00 Number of clariflocculator= 8.00 Discharge of each clariflocculator= 31.25 mld Gt Factor=39600.00 Velocity Gradient of flocculator= 22.00 (1/sec) Detention Time of flocculator= 30.00 min Detention Time of Clarifier= 3.10 hr Diameter of inlet pipe= 0.68 m Number of ports=38.00 of size 0.1 m by 0.2 m Diameter of flocculator=14.25 m Diameter of circular clarifier= 36.69 m Power spent=281.00 watts Number of blades= 8.00 Depth of each blade= 3.00 m Width of each blade= 0.48 m Area ratio= 18.93 Percent Hence Ok Rotational speed of paddle= 4.00 rpm Radius of shaft= 0.96 m Velocity of water below the partition wall

m/s m/s min m

between flocculator & clarifier= 0.30 m/min Total Depth of clarifier= 5.25 m Depth at the centre of clariflocculator= 6.78 m Surface Loading= 1.45 cubic m/square m/hr Hence Ok Weir Loading=271.28 cubic m/m/day Hence Ok Number of notches= 1112 Center to Center distance of v-notches= 0.10 m Depth of water in collecting channel= 0.30 m Total Depth of water in collecting channel= 0.60 m Size of collecting channel(with flat bottom)=0.8 m by

0.60 m

DESIGN OF RAPID SAND FILTER Entered Discharge Q

= 250.00 mld

Enter Rate of filtration in cu. m/sq. m/hr [ Range 4.8 to 6.0 ] = 5.00 Enter length to width ratio of filter bed [ Range 1.11 to 1.66 ] = 1.40 Enter ratio of c/s area of lateral to area of orifices [ Range 2 to 4 ] = 3.00 Enter ratio of area of manifold to area of laterals [ Range 1.5 to 3 ] = 2.00 Enter quantity of air required for backwash [ Range 0.9 to 1.5 cubic m/sq. m/min ] = 1.20 Total depth of sand bed=0.60 m Depth Depth Depth Depth Depth

of of of of of

Gravel Gravel Gravel Gravel Gravel

layer layer layer layer layer

for for for for for

gravel gravel gravel gravel gravel

size size size size size

2 5 12 20 38

mm mm mm mm mm

-

5 12 20 38 65

mm mm mm mm mm

= 7 cm = 8 cm = 9 cm = 13 cm = 15 cm

Total depth of gravel bed= 0.53 m Number of filter beds= 31 Width of filter bed= 7.14 m Length of filter bed= 10.00 m Water depth over sand bed= 1.20 m Total number of perforations required= 2730 Diameter of central manifold= 1.28 m Number of laterals= 133 Diameter of lateral= 78 mm Number of perforations per lateral= 20 Length of each lateral= 2.93 m Diameter of orifices=10 mm Spacing of perforations per lateral= 143 mm Spacing of wash water trough= 1.25 m Provide 8 troughs of 30 cm wide by 46 cm deep in each filter Provide main trough of 45 cm wide by 135 cm deep in each filter Quantity of air required=428.57 cubic m Provide 2 number of wash water tank Diameter of wash water tank= 18.10 m

Height of wash water tank= 3.00 m DESIGN OF PURE WATER SUMP Entered Discharge Q

= 250.00 mld

Number of pure water sump = 3 Discharge of each sump= 83.33 mld Sump size= 38 m x 38 m Depth of sump= 4.00 m CHEMICAL STORAGE HOUSE Entered Discharge Q

= 250.00 mld

Number of chemical storage house= 3 Discharge of each chemical storage house= 83.33 mld One bag contains 50 kg of Alum Provide Number of bags of Alum=15000 for three months for one chemical storage house Provide 14 rooms of 7.50 m X 7.50 m for one chemical storage house ALUM SOLUTION TANK Entered Discharge Q

= 250.00 mld

Provide 40.00 tanks of 1.5 m x 1.5 m x 1.2 m deep DESIGN OF CHLORINATOR Entered Discharge Q

= 250.00 mld

One Cylinder contains 100 kg of chlorine. Provide 151.00 number of cylinders per month. HYDRAULIC PROFILE OF WTP Entered Discharge = 250.00 mld Entered length of pipe from parshall flume to distribution chamber in m = 10 .00 Entered length of pipe from distribution chamber to flash mixer in m = 30.00 Entered length of pipe from flash mixer to distribution chamber in m = 5.00 Enter length of pipe from distribution chamber to clariflocculator in m = 30 .00 Entered length of pipe from clariflocculator to filter in m = 40.00 Entered length of pipe from filter to pure water sump in m = 30.00 Entered velocity of flow through pipe from parshall flume to distribution chamber [ 0.9 To 1.8 m/s ] = 1.00

Entered velocity of flow through pipe from clariflocculator to filter [ 0.9 To 1.8 m/s ] = 1.00 Entered velocity of flow through pipe from filter to pure water sump [ 0.9 To 1.8 m/s ] = 1.00 Entered R.L. of tip of aeration fountain in m =216.00 Entered number of bent of pipe from parshall flume to distribution chamber = 2.00 Entered number of bent of pipe from distribution chamber to flash mixer = 2.00 Entered number of bent of pipe from flash mixer to distribution chamber = 2.00 Entered number of bent of pipe from distribution chamber to clariflocculator = 2.00 Entered number of bent of pipe from clariflocculator to filter = 1.00 Entered number of bent of pipe from filter to pure water sump = 1.00 FRICTION FACTOR PIPE MATERIAL R.C.C.,A.C.,HDPE/PVC,SGSW C.I.(for corrosive waters) C.I.(for non-corrosive waters) G.I. Entered R.L. R.L. R.L.

FRICTION FACTOR 0.010 0.030 0.034 0.031

-

0.020 0.053 0.070 0.060

friction factor = 0.04 of tip of aeration fountain=216.000 m of second cascade=215.750 m of third cascade=215.500 m

R.L. of fourth cascade=215.250 m R.L. of fifth cascade=215.000 m Water level of collecting channel=214.850 m Base level of collecting channel=213.934 m Water level of distribution chamber before flash mixer=214.468 m Water level of flash mixer=214.295 m Water level of distribution chamber before clariflocculator=214.192 m Water level of clariflocculator=213.626 m Water level of collecting channel of clariflocculator=213.426 m Water level in the filter=213.094 m Water level in clear water sump=211.888 m Total head loss from tip of aeration fountain to clear water sump= 4.112 m