UNA-620A_Operating InstructionREV02 by B.bennett

May, 2004

A SA HI KA KAS SEI MIC MICR RO FIL ILT TRA IO ION N ME M EM BRA NE MO DUL DULE E

micr mic rozaTM UNA-620A O PER PERA A TING INS INST TRU RUC C TIO ION N

Caution: Rea d a nd c a refully efully follow follow this this manua l prior prior to use use of the modul mod ule. e. Keep this this manua l in in a plac pla c e e a sy to to find find a nd e a sy to to c onsul onsultt with. with.

PRE PR EFA C E

 The  The MF module a nd the the module system may be subject ubjec t to the the Expo rt C o ntro ntro l Regulati Regula tio o n o f J a p a n. If it is the ca c a se , the Ex Exp ort lic lic ense is is req uired uired a s the forma forma l applica ap plica tion tion for fo r the export. export. Asa As a hi Ka Ka sei C hemica ls C orpor orpo ra tion tion inspe nspec c ts ever eve ry Mic roza MF module, and ships only the modules that meet Asahi Kasei's specifications. However, even the modules are used within the standard operating conditions in this manual, there will remain a possibility of membrane failur failure, ca c a usin using g leakag lea kage e of o f feed into into the the perm p ermea ea te side. side. It is therefo thereforre necessary for the user of the Microza module to monitor in order to immediately detect any leakage, and to have adequate countermeasures for the equipment and quality control procedures, to prevent a ny da mage mag e which may be c a used used by membra membra ne failur failure. e. Asahi Kasei Chemicals Corporation will not be responsible for any d a mage ma ge s, injur injuries ies,, or o r lo lo sse s without foll fo llo o wing those those notice notic e s.

A PPLI PPLIC C A TIO IONS NS O F UNA UNA-6 -62 20A Applications of UNA-620A are as follows: Water pur p urif ifica ica tion tion in drink drinkin ing g wa ter ma ma keup proc ess ess  C la d removal in in conde c onde nsa nsa te of boi bo iler water  Secondary treatment of sewage  Pre-treatment for RO desalination  Iron a nd manga ma nganes nese e removal emova l  *in combination with pre-oxidation by oxidant, such as sodium hypochlorite C larifi arific c a tion tion of o f wa ter a s a n al a lternati ternative ve to c oa gulation gulation sed sediimentation mentation and/ and / or  c oa gulation fil filtra tra tion tion C onsul onsultt Asa Asa hi Ka Ka sei C hemica ls C orpor orpo ra tion: tion: should your application not be specifically noted in the sample applications of this instr instruc uc tion should there be a change in the application or system use after modules or system have been dep loyed.

A PP PPL LIC ICA A BIL ILIT ITY O F UNA UNA-62 -620A 0A  Thi  This s instr nstructi uction on intr ntrod uce s the the typica typica l a ppl pp lic a tions tions a nd operati op erating ng c onditi onditions. ons. As applicability of module varies depending on the feed solution and operating c ondit ond itions ions,, plea se c hec k the the a pp lica bilit bility y precis prec isely ely prior prior to use. use.

2

C ONTENT

1. SAFETY INSTRUCTIONS

5

Definition of Signals Types of signals Safety Guidance

2. NOTICES ON MODULE HANDLING

8

Notic es on Solvent and C hemicals C ontac t Caution label Additional information Instances of accident

C hemical C ompatibility of Mod ule Housing Notic es on Use of Mo dule Prevent from Physical shock: Preservative: Cleaning of Unit before testing run: Location of the Unit Installation:

Notic es on C lea ning a nd Sanitization of Module Cleaning or Sanitization by Chemicals:

Store the Module

Short-Term Suspension of Operation and Module Storage Long-Term Suspension and Module Storage Protect from freezing Keep away from UV light and high temperature Do not expose to physical impact 3

 Transportation of MF System Do not install modules in the system during transportation

Disposal of the Module

3. PARTS LIST

16

4. HOW TO INSTALL THE MODULE

18

5. HOW TO DISC ONNEC T THE MODULE

20

6. TYPIC AL OPERATING C ONDITIONS

21

Inside-out Filtration Outside-in Filtration Mode Mode Filtration Pressure Recirculation Flow Rate Reverse Filtration pH Range

7. C HEC KING THE INTEGRITY

23

C hec king the integrity (Inline )

Inspection Procedure C hec king the integrity (Offline)

Inspection Procedure

8. STANDARD SPECIFICATION

26

4

1. SAFETY INSTRUCTIONS Follow the notices in this instruction whe n using microfiltration module (MF module hereafter) for the safety and c orrec t ope ration. Asahi Kasei will not be in a position to b e responsible for any da mages, injuries, or losses of users or any third parties without following the no tices.

Definition o f Signals Safety instructions in this guide and the warning label attached on the module, are classified to two categories as follows:

Warning: Warning flags notify you of the potential for serious bodily harm or fatal injures.

Caution: Caution flags notify you of the potential for bodily harm or, hardwa re or produc t damage.

Types of signals  There are three types of signals in this instruction:

 The signs notify you of dangerous state.

 The signs notify you of prohibition.

 The signs notify you of the proc edure required.

5

Safety Guidance

Warning: Wear protective clothing when fragments can cause injuries.

cutting

modules.

Scattering

Wear protective clothing including safety glasses and gloves when handling the chemicals such as sodium hypochlorite and caustic soda, etc . If the chemic als touc h the skin or the eyes, wa sh the area with much amount of water then see a doctor. It can cause of  eyesight loss or chemical skin burn

Do not mix acid and sodium hypochlorite when both are used fo chemica l clea ning. C hlorine gas emerges by the mixture and it is very hazardo us.

6

Caution:

MF membrane is wetted by the preservative that contains 30% of  calcium chloride. Wear protective clothing to avoid skin contact and eye contact when draining the preservative.  The heavy load ed module ought to be carefully c arried out by at least two workers.

Fasten cap nut of TP-joint when installing or disconnecting modules. If  the TP-joint comes off, it can cause injuries or damages to the TP-joint itself. Fix the module with a U-band or chain to the module rack when installing modules. If the module falls down, it can cause injuries o damages to the module housing. (However, do not fasten the module too tight.)

Fasten firmly the p ressure hose not to c ome o ff by pressurizing d uring module inspections such as leakage c hec k in pa rticular.

7

2. NOTICES ON MODULE HANDLING Follow the safety instructions in this manual for using the module properly.

Se uence of Module Handlin

C lean MF System

Operation

Install MF Modules

C hemical C leaning

Sanitization & Water Rinsing

Disconnect Modules for Replacement

Re eat

Notices on Use of Mod ule Prevent from physical impact: Do not expose to any physical impact to the module such as dropping, stumbling and trembling, etc. Membrane c an be d amaged even if the housing is not damaged.

Preservative: Membrane in the module is wetted with aqueous preservative solution that contains calcium chloride by 30% when it is shipped . The purpose of the solution is to keep membrane wet and to prevent proliferation of microorganisms. Rinse off the solution thoroughly with clea n water before use. (Important) C alcium c hloride is highly corrosive resistant to metals so tha t needs to be c arefully  used if there are peripheral piping or member of framework, which are made from metals. Definition of clean water is one that contains less turbidity component, less organic  substance so as it may not give any bad effect on flux of the module, for example drinking water and membrane filtered water.

Cleaning of Unit before Test run: Prior to the trial operation, flush all piping section. Foreign substances, such as metal fragment can da mage the membrane. Oil remaining ca n cause of membrane fouling.

8

Loc ation of the Unit Installation: Protec t mod ules from direc t sunlight and UV light. module housing a nd membrane.

Ultraviolet light ca n degrade

Notic es on C leanin and Sanitization of Module

Cleaning or Sanitization by Chemicals: Chemical cleaning will be required when the permeate flux is reduced due to a buildup of organic or inorga nic foulants. Use the following proc edure to conduct cleaning. (1) Selec tion of chemica l solution  You can choose the most effec tive clea ning solution and the co ncentration in the table below. If you do not achieve effective cleaning with these solutions, consult Asahi Kasei. (Fouling Substanc es and C leaning A gents) Foulants C lea ning Agent Bacteria, Sodium hypo chlorite Orga nic material Orga nic materials, Silica colloid Inorganic colloid

C austic sod a

C onc entration Less than 5,000ppm (Conc entration of c hlorine need ed to be effec tive) Less than 4%

HNO 3, HC l Less tha n 10% Oxalic ac id Less than 2% C itric acid Less tha n 10% EDTA Less tha n 0.4% Sanitization Sodium hypochlorite 10 to 100ppm Hydrogen peroxide Less than 1% *Standard chemic al cleaning: (2,000 – 5,000ppm NaC lO +1% NaOH) x 7 to 8 hrs → 2-5% acid x 2hrs → water rinsing (2) C lea ning proc edure  The sequence of chemical clea ning and water flux mea surement c onsists of the following step s. *Remove SS on membrane surface by air scrubbing as much as possible prior to chemical c leaning. Preliminary water rinsing (Air scrubbing)

Flux measurement

Chemical cleaning

Water rinsing

Flux measurement

(Repea t when using multiple c hemica ls for clea ning.)

9

(3) Operating condition for cleaning Preliminary water rinsing (Air scrubbing) Module Air Flow Rate  Time Procedure

Discharge Flow Rate and Volume

C hemical C leaning Module Volume

Permeate flux  Time  Tempe rature Proc edure

Water Rinsing Module Permea te Flux Rec irculation Flow Rate Proc edure

C onfirmation of finishing rinse

UNA-620A 5Nm3/ hr 1 minute

Fill the mod ule up with wa ter during air scrubb ing. Drain water of feed inlet in the module after finishing a ir scrubbing. 6 m3/hr x 30 sec. 45 liter/ mod ule

UNA-620A 90 liter/ mod ule (30 liter of hold up volume inside the module + rough standard of c hemicals inside the piping) 0.5 – 0.75 m3/ hr NaC lO, NaOH: 3-7 hrs Acid: 1-2 hrs Less than 40 degrees C elsius Ad d clea ning solution in the rec irculation tank. C irculate the c leaning solution while the filtrate is returned to the rec irculation tank.

UNA-620A About 0.5 – 1 m3/ hr Ab out 0.5 m3/ hr Rinse by feed ing clea n water in feed tank Drain retentate and p ermeate to the wa stewater tank. Determined by concentration of the residual NaC lO, pH, etc.

10

Warning Wear protective clothing including safety glasses and gloves when handling the chemicals such as sodium hypoc hlorite and c austic soda , etc . If the chemical touch the skin or the eyes, wash the area with much amount of  water and see a do ctor. It can cause of eyesight loss or chemica l skin burn.

Warning Do not mix acid and sodium hypochlorite when both are used for chemical cleaning. C hlorine gas emerge s by the mixture a nd it is very hazardous.

11

C onfirmation of C lea nin Effec ts

C onfirm the results of clea ning effec t after c leaning by the following steps. C onsult with Asahi if the result is not satisfactory.

(Measurement): There are two methods available. 1. C onfirmation of preliminary performanc e Measure and record below subjects when starting initial operation and/or operation a fter replacing module in order to confirm its clea ning effec ts. a) Preliminary flux of clean water and/ or feed wa ter b) Pressures c) Water temperature 2. Mea suring method  There are two available methods for measuring clea ning effects, using clean water and/ or feed wa ter. a) Preliminary flux of clean water and/ or feed wa ter b) Pressures c) Water temperature

(Calculation) C onvert the a bove rec ord into the standardized flux rates (at 100kPa, 25 deg C ). The flux under the standard condition = Observed flux x 100/ *Average filtration pressure) x **Temperature c oefficient Notes: *Average filtration pressure. (Trans Membrane Pressure) =(Mod. inlet press. + Mod. outlet press.)/ 2 - Filtrate press. ** Temperature c ompensation c oefficient is given in the table o n pa ge 9. For example, At 15.2 deg C is given a s 1.269 from the table. Flux rec overy rate (%) = of clean wa ter or feed wa ter after cleaning

x 100

Initial water flux at the shipping or feed wa ter flux

When the permeate flux is measured, the recirculation flow should be set as less than 1m3/Hr  The flux cannot be mea sured c orrec tly at higher rec irculation flow because of the pressure drop in a module. (The app arent flux will be higher than the a ctual pe rmea te flux.)

12

[Temperature C ompensation coefficient]

℃

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

10

1.463

1.459

1.455

1.451

1.447

1.443

1.438

1.434

1.430

1.426

11

1.422

1.418

1.414

1.410

1.406

1.403

1.399

1.395

1.391

1.387

12

1.383

1.379

1.375

1.372

1.368

1.364

1.361

1.357

1.354

1.350

13

1.346

1.342

1.339

1.335

1.331

1.328

1.324

1.320

1.317

1.313

14

1.310

1.307

1.304

1.300

1.297

1.293

1.290

1.287

1.283

1.280

15

1.276

1.273

1.269

1.266

1.263

1.260

1.256

1.253

1.250

1.246

16

1.243

1.240

1.237

1.234

1.231

1.228

1.224

1.221

1.218

1.215

17

1.212

1.209

1.206

1.203

1.200

1.197

1.193

1.190

1.187

1.184

18

1.181

1.178

1.175

1.172

1.169

1.167

1.164

1.161

1.158

1.155

19

1.152

1.149

1.146

1.144

1.141

1.138

1.135

1.132

1.130

1.127

20

1.124

1.121

1.119

1.116

1.114

1.111

1.108

1.106

1.103

1.101

21

1.098

1.095

1.093

1.090

1.088

1.085

1.082

1.080

1.077

1.075

22

1.072

1.070

1.067

1.065

1.062

1.060

1.057

1.055

1.052

1.050

23

1.047

1.045

1.042

1.040

1.037

1.035

1.033

1.030

1.028

1.025

24

1.023

1.021

1.018

1.016

1.014

1.011

1.009

1.007

1.005

1.002

25

1.000

0.998

0.996

0.993

0.991

0.989

0.987

0.985

0.982

0.980

26

0.978

0.976

0.974

0.971

0.969

0.967

0.965

0.963

0.960

0.958

27

0.956

0.954

0.952

0.950

0.948

0.945

0.943

0.941

0.939

0.937

28

0.935

0.933

0.931

0.929

0.927

0.925

0.923

0.921

0.919

0.917

29

0.915

0.913

0.911

0.909

0.907

0.906

0.904

0.902

0.900

0.898

30

0.896

0.894

0.892

0.890

0.888

0.887

0.885

0.883

0.881

0.879

℃

0

1

2

3

4

5

6

7

8

9

30

0.896

0.877

0.859

0.842

0.825

0.808

0.793

0.777

0.782

0.748

13

Store the module

Short-Term Suspension of Operation and Module Storage Fill a module with water when you store the modules or stop o peration. Without filling water, membrane c an be dried and may lose the c haracteristic of MF membrane.

Long-Term Suspension and Module Storage  To store a module for long-term, fill the module with the preservative solution, such as sodium hypochlorite 50ppm solution. Store it awa y from direc t sunlight a nd maintain the storag e area cool.  The preservative solution should be replaced once in a three- months. When you store the modules on M F system, co nduc t chemica l clea ning before the suspension. Prior to re-using the MF system, disinfec tion of the M F system a nd modules is recommended. C onsult Asahi Kasei if the modules need to be stored for longer than one (1) year.

Protec t from freezing Ensure to protec t module from freezing. the p erformance of MF membrane.

Freezing can da mag e the modules and lose

Keep away from UV light and high temperature Do not expose mod ules to direc t sunlight or UV lamp for long time. Module housing and/or parts made from resin may degrade by UV light and high temperature, if they are exposed to them for a long time.

Do not expose to physical impac t Modules should be prohibited from any physical impact such as falling and shocking. Membrane may be damaged even if it seems to be no damages on the module housing from appea rance.

 Transportation of MF System

Do not install modules in the system during transportation When a M F system is transported , remove the modules from the system. Physical shock during transportation can cause the membrane damage. It is rec ommend ed to install dummy modules instea d of modules for system transpo rtation.

14

Disposal of the module Follow the loc al safety cod es for the hand ling of the industrial waste when you d ispose the modules. Consult Asahi Kasei C hemic als C orpo ration for further information on detailed exploitation. Ab ridgment of Ma terial Safety Data Sheet is described below.

Caution: 1) Dispose of modules as industrial waste in accordance with local governmental regulation. 2) In case there is a possibility that ha zardous and harmful substances rema in in mod ules, take the nec essary countermea sures for it. When mod ules are to incinerate, use the system which is capa ble of trea ting exhaust gas (over 800 degrees C elsius). And then, dispose by industry-waste-treatment plant whic h can neutralize hydrogen fluoride ga s or dispo se at designated landfill.

Warning

Wear protective clothing when cutting modules. Scattering fragments can cause injury.

15

3. PARTS LIST Concentrate outlet

4 Permeate outlet

Label indica tes retentate outlet

1

2

3 Label Mo dule housing

5

Feed inlet

No Description 1 C AP NUT 2 BLIND PLATE 3 GASKET 4 END C AP 5 PROTEC TION C AP

Label indica tes feed inlet

4

Qty 1 1 1 2 1

Fig.1 Module assembly

16

8 7 6 5

1

12

4

3

5 9 7 10 11

No 1 2 3 4 5 6 7 8 9 10 11 12

Description C AP NUT BLIND PLATE GASKET UNION SOC KET O-RING C AP B NUT TP J PINT C AP A GASKET THREE PIECE C LAMP PROTEC TION C AP

Qty 1 1 1 1 2 1 2 1 1 2 1 1

2.5S Ferrule

Fig.2 Module c onnection a ssembly

17

4. HOW TO INSTALL THE MODULE Follow the procedure when installing modules or dummy modules. Disconnect old or dummy modules when they are on the rack. Follow the procedure in the next chapter “5. How to Disconnect the Module”. Modules will be shipped as status of fig. 1 (at P16). Need separate order for parts shown in Fig. 2.

(Important) A series of wo rking steps should be c arried o ut continuously. Do not leave module without its preservative solution for a long time. The module has a distinct differenc e of structure between its feed side and outlet side.  The module head, marked "FEED INLET" mark, should be plac ed at the bottom and the o ther hea d, marked “C ONC ENTRATE OUTLET” at the top. (Important) Mod ules should be prohibited from falling and shoc king. Membrane may be da maged, even if there a re no da mages on the housing.

1. Open a c arton box. Take out the module from the polyethylene bag. 2. Remove top and bo ttom end ca ps and a blind plate at the top c onc entrate outlet of the module. 3. Set MF mod ule at up right position to drain out excess preservative. * *approx 100 – 500ml

Caution Wear appropriate safety clothing including safety glass and gloves, etc. 30% of calcium chloride is contained in the preservative solution a nd it ca n irritate your skin and eyes.

4. If the preservative come in contact with hands or outside the mod ule, wipe out after washing b y water. 5. Set an O-ring on the c ap B and adjust the ca p B with the pe rmeate nozzle. 6. Screw up the cap B with the nut. (Screwing torque: 120N-m) 7. Set an O-ring in the pa ckage on the c ap A a nd adjust the c ap A with the feed inlet. 8. Screw up the c ap A with the nut. (Screwing torque: 120N-m) 9. Mo unt ga sket in the pa ckage on the ferrule. 10. Mo unt the module o n the ferrule. Fac e the retentate side no zzle to the c onc entrate pipe. 11. Fix the mod ule to the module rac k so as the mod ule may not fall down.

18

Caution  The hea vy loa ding module ought to b e c arefully ca rried out by a t lea st two workers.

12. Mount a gasket on the retentate side nozzle of the module. Adjust the nozzle with the retentate pipe a nd fa sten the cap nut. (Keep the gasket on the right po sition) 13. Loosen the nut of the TP-joint then slide down the joint. Insert the top of the cap B into it and fasten the nut lightly. 14. Align the cap A on the feed side with the ferrule and tighten them lightly with a clamp. 15. Fasten the nut of the TP-joint and the c lamp. 16. Test-run of the system with wa ter and chec k for lea kage from all piping a nd connec tion pa rts.

Caution Use TP-joint specified by Asahi Kasei. Using other types may cause leakage or da mages on the module.

Caution Fix the module with a U-band or chain to the module rack when installing modules. If the module falls down, it can cause injuries or da mag es to the mod ule housing.

19

5. HOW TO DISC ONNEC T THE MODULE

Follow the proc edure when disconnecting modules or dummy modules. 1. 2. 3. 4. 5. 6. 7. 8.

Make sure that liquid in piping and in the modules (or dummy modules) is displac ed water. Displaced with water if the module is filled with other solution. Drain out water in piping and in a module, from a drain valve. Loosen and disconnect the cap nut on the retentate side of the module. Loo sen the nut of the TP-joint of the module by hand s then slide and fa sten it temporarily. Loosen a nd dismount the c lamp a t the bottom of the mod ule, while making sure that the module is not falling over. Take off the U-ba nd or any other module support. Disconnect the module.

Caution  The hea vy loa ding module ought to b e c arefully ca rried out by a t lea st two workers.

Caution Fasten the nut of the TP-joint tightly. Falling of the joint may injure workers and/ or da mage the joint itself.

(Important) Wipe off ferrule of the system. Dust and stain on the ferrule can cause the contamination o r leak from the sea ling.

20

6. TYPIC AL OPERATING C ONDITIONS OF UNA-620A Follow the typic al operating cond itions of UNA-620A Outside-in filtration mode

Inside-out Filtration Mode to the outside of hollow fiber membrane. The module is specifically Feed water should be supplied Filtration is carried out by "inside-out filtration mode" that supplies feed solution to the designed to be operated in the outside-in filtration mode. Therefore, dead-end filtration with solution inside of hollow fiber membrane and filtrate is taken out from the outside. containing high amount of suspended solid causes clogging in the space between hollow fiber  If the feed solution is supp lied by "Outside-in mode", fouling substances can result in membranes and prevent the smooth supply of f eed water. It decrease module performance and it reduc ed performance a nd the c leaning may not bec ome effec tive. becomes the cause of poor flux recover by cleaning, etc.. Feed water temperature Feed wa ter temperature is limited to 40 deg C maximum. Higher temperature than 40 deg C may cause d eformation a nd degrada tion of module housing.

Filtration pressure Followings are ma ximum service pressure available. Feed side pressure: 300kPa  300kPa   Trans-membrane pressure difference:

Reverse -filtration pressure Maximum reverse-filtration pressure:

300kPa

(Important) Do not give pressure shoc k in the case of reverse-filtration. Operation with repeated pressure shoc ks may c ause degrada tion o f hollow fiber membrane a nd d amage end caps of the module.

Air Scrubbing with reverse-filtration Module Reverse filtration flow rate with air scrubbing

UNA-620A

≦ 8 m3/hr/module

Reverse-filtration flow rate (Reverse filtration only: Drain from feed inlet and retentate side of module) Module Reverse-filtration flow rate

UNA-620A ≦ 12 m3/hr/module

Drain out reverse-filtration effluent evenly (1:1 ration) from the feed side and the retentate side of the modules.

Air flow rate Module Air flow rate for air scrubbing

UNA-620A ≦ 5m3/hr/module

Pressure of air is 200kPa. Lower pressure may not feed the air to the module. 21

Water flow rate during flushing Module Flow rate for flushing

UNA-620A ≦ 6m3/hr/module

Standard operating conditions  Type o f raw water Pre-trea tment Design flux *1 Recirculation flow rate Reverse-Filtration Flow rate Recovery rate NaClO in Reverse Filtration Air Scrubb in Frequency Method

Air volume Volume of  Reverse filtration Flushing *3  Tempe rature pH range Chemical cleaning

Pre-trea ted surfac e water Filter or screen of  100 – 200um 5 - 10m3/hr

Surfac e water

←

Sewa ge/ Waste water ←

0.5m3/hr

2 – 5m3/hr ←

2 – 4m3/ hr ←

Flux（ 1.0 - 1.5 times）

←

←

90 - 95 %

←

←

1 – 5pp m

←

←

Once/ 30 min

←

←

(A/S +Reverse Filtration) x more than 30 sec *2→ Flushing ×30 sec. 5Nm3/ Hr Flux×1.0~1.5 times (Less than 8Nm3/ Hr)

←

←

3.5 - 5Nm3/Hr ←

5Nm3/Hr ←

6m3/Hr Below 40 deg C

← ←

← ←

1 - 10 1) Periodical cleaning 2) When feed press. Rea ches by100 - 200kPa. *4

← ←

← ←

*1: Based on 20 de g C . *2: Adjusted by recovery rate. *3: If flushing rate need to be changed, adjust the time to equate its emission (e.g. 6m3/ hr x 30 sec = 50 liter → 3m3/ hr x 60 sec) *4: Feed pressure during the start-up is about 20-50kPa. (Note) Abo ve figures are standard c ond itions and d iffer by the quality of raw wa ter.

22

7. CHEC KING THE INTEGRITY O F UNA-620A

 You should chec k the integrity of a module in the following ca ses: * When you use a new module. * When leak is suspec ted. Refer to p age 24 - 25 for further information.

(Important) When the hollow fiber membrane is exposed to c ompressed air, the membrane c an dry out and loose the filtration performance. A lso, d irty compressed air can contaminate the membrane. Follow these cautions when c hec king the integrity of the module: * Finish each integ rity check within 5 (five) minutes. Maximum pressure should be limited up to 200 kPa. * Fill up the inspec ted mod ule with wa ter as soon as the test is finished . If the membranes dry out, it would lose the pe rformance o f MF membrane. * Compressed air should b e c leaned by filter to remove dust or oil prior to use.

23

C hec king Integrity (Inline) When the inspection is carried out while a module is still on the module rack. V-2  TP-joint

P2 V-3

P1 V-1

V-4

C ompressed air (for air scrubbing)

Fig.3 Pipe c onnection for the online inspection

Inspection Procedure 1. 2. 3. 4.

Stop filtration. C lose all the valves. Open V-2. Open V-4 slowly to send compressed air into the module and then raise the pressure up to 200kPa maximum. 5. Observe inside the transparent TP-joint to c onfirm if there are no continuous air bubbles. Generation of continuous bubbles: Abnormal No c ontinuous bub bling: Normal (Note): Discontinuous bubbling just after the pressurization should not be judged as abnormal.

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C hec king Integ rity (Offline)  TP-joint

Blind Plate

Regulator C ompressed a ir or Nitrogen ga s

V-1

P1

V-2

V-3

Fig.4 Pipe connection for the “OFF-THE-SYSTEM” INSPECTION

Inspection Procedure 1. Disconnec t the mod ule from the system. 2. C ap the retentate nozzle with a blind plate. 3. Stand the module vertically as shown in the fig. 6 and conne ct all nec essary pipes. In the case that the pressure-resist hose is used, fix it tightly not to come off by add ing the pressure. Special connection pa rts must be prepared prior to the test if  flexible hose is used to supply air.

4. 5. 6. 7. 8. 9.

Caution When using pressure resistant tubing, connect it tightly with a module to prevent the tubing from coming off the module by pressurizing. Fix the module facing its permeate end upwa rd. Fill clean water from the retentate nozzle to fill up the feed side of the module. Again, ca p the retentate side with a blind p late. Open V-1 and set the air pressure to 100kPa by the regulator. Open V-3 slowly and feed air to the module. Water overflows from the permea te side at first. Keep the cond ition till the overflow from the permea te outlet ce ases. Observe occurrence of continuous bubbles in the permeate side. Raise the p ressure up to 200kPa if there is no continuous bubbling. C ontinuous bubbling: Mod ule is abnormal. No C ontinuous bubbling: Mod ule is normal. (Note): Discontinuous bubbling will not last long. Repeat from step 5 if  discontinuous bubbling lasts for a long time. There ma y be a possibility of d ried membrane. C onsult Asahi Kasei for the right judgment. 25

8. STANDARD SPECIFICATION O F UNA-620A

Items Membrane Material Effec tive surfac e area Performanc e Nominal pore size (um) Operating conditions

Max feed pressure (kPa) Max TMP Differenc e (kPa) Ma x temperature (deg C ) pH range

Material

Module housing Adhesive Gasket, O-ring

Module dimension (mm) Module weight (kg)

UNA-620A Polyvinylidene fluoride (PVDF) 50 m2 0.1 300 300 40 1 – 10 ABS Polyurethane NBR 2338L x 165φ

Filled with water Without water

60 30

Refer to page 21, "Typical Operating C ond itions of UNA-620A" for more detail. C onsult Asahi Kasei, if initial flux rate in the stand ard specification could not be confirmed. Poor water quality or the system design (ex. excess back pressure because of thin tubing etc .) may be the cause.

C ontact Asahi Kasei for the following c ases. 26

* Low initial water flux rate * Difficulty in judgment of integrity test * The application not listed in this instruc tion * Cha nge of a pplication from the original one * Storage of modules over one (1) year * More detailed information on design of MF system * Any other claim or questions on product or how to use

ASAHI KASEI C HEMICALS C ORPORATION SALES & MARKETING DEPARTMENT MICROZA DIVISION Hibiya Mitsui Building 1-1-2 Yurakucho, C hiyodaku, Tokyo 100-8440  Tel: +81-3-3507-2682 Fax: +81-3-3508-1474 Asahi Kasei reserves the right to change these d ata, spec ifications or appearanc e o f produc t without prior notice. Microza is a registered trademark of Asahi Kasei Edited in April 2004

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