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AsahiKASEI MICROZA UNA Series, Руководство по эксплуатации

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49 

 

7.2.3 Pressure on the Permeate (Treated Water) Side 

 

The  pressure  on  the  permeate  side  fluctuates  depending  on  factors  such  as  the  diameter  of  the 
pipe through which permeate flows, the distance to a permeate storing tank, and module and rack 
heights.  As  the  permeate-side  pressure  rises  high  due  to  pressure  loss,  higher  pressures  are 
required  for  filtration,  leading  to  high  electric  power  costs.  Since  such  a  high  pressure  on  the 
permeate side becomes close to the upper limit pressure, minimize the permeate-side pressure as 
low as possible.   
More specifically, set the permeate-side pressure to 70kPa or below (Maximum pressure: 100kPa). 
 
Example 1: Case where the pressure on the permeate side of UNA-620A is 50kPa 
When the system is operated with the module inlet pressure being 260 kPa, 

 

TMP = 

2

力

モジュール排出水側圧

モジュール入口圧力＋

- Pressure on permeate side 

= 

2

240kPa

260kPa

＋

  - 50kPa = 200kPa   

 

In this case, the allowable TMP is 200kPa, the maximum pressure recommended. 
A filtration system under this condition can therefore produce the design permeate flux stably. 

 

The  basic  design  of membrane filtration facilities  (such  as flux  and module  count)  proposed 
by Asahi Kasei calls for operation under a transmembrane pressure of up to 200kPa.   

 
Example 2: Case where the pressure on the permeate side of UNA-620A is 150kPa 

When  the  system  is  operated  with  the  module  inlet  pressure  being  300  kPa,  the  maximum 
module inlet pressure, 
 

TMP = 

2

280kPa

300kPa

＋

- 150kPa = 140kPa 

 
This TMP is far below 200 kPa, a precondition for a system design with the module. A filtration 
system under this condition cannot therefore produce the design permeate flux stably.   

 

Please consult Asahi Kasei if it is difficult to set the permeate-side pressure to 70kPa or lower. We 

will review the design flux, pipe diameters, etc. 

Module inlet pr Pressure on discharge side 

Содержание MICROZA UNA Series

Страница 1: ...and adhere to all of the safety instructions herein Keep the Operating Instructions in a convenient location for consultation Asahi Kasei agrees not to assert its own right under its patented invention about method for use of the membrane module s against the end user of membrane module s manufactured by Asahi Kasei only to the extent necessary to use such module s 18Z03K ...

Страница 2: ...his manual and embody quality control protocols and procedures to avoid damage caused by a membrane failure Please ensure that appropriate procedures are enacted to avoid contact with chemicals and leaking fluids resulting from module housing failure Asahi Kasei shall not be held liable for consequential damages or losses caused by such noted membrane failure or by non adherence of the above noted...

Страница 3: ...on Parts 9 2 3 2 Module Connection Types and Required Parts 10 2 3 3 Connection of Module Upper Part 11 2 3 4 Connection of Module Lower Part Using Cap A 12 2 3 5 Connection of Module Lower Part Using Cap B 13 2 3 6 Connection of Module Side Nozzles 14 3 2 1 Raw Water to the Module 18 3 2 2 Hazardous Materials 18 System Cleaning before Test Operation 19 Locating the System 19 Preservative Solution...

Страница 4: ... Types of Chemical Cleaning EFM CEB and CIP 69 9 3 Chemical Cleaning Sequences of EFM CEB and CIP 71 7 2 1 Pretreatment 47 7 2 2 Filtration Process 47 7 2 3 Pressure on the Permeate Treated Water Side 49 7 2 4 Simultaneous Air Scrubbing Reverse Filtration AS BW 50 9 1 1 Contaminants and Applicable Cleaning and or Disinfecting Agents 67 9 1 2 Acid Selection 68 Cleaning Protocol 77 Assessing Post Cl...

Страница 5: ...ns The Safety Notes and warning labels in these instructions are classified as follows The meanings of the Safety Symbols used in these Instructions are also explained Warning Incorrect handling or operation of the module by not adhering to the warning may cause serious and possibly fatal injury and or damage the module Caution Incorrect handling or operation of the system by not adhering to the c...

Страница 6: ...5 Safety Symbol Legend There are three types of signals in these Operating Instructions WARNING or CAUTION NO or DO NOT MUST DO ...

Страница 7: ...e membrane is wetted with a 30 calcium chloride solution Always wear protectors such as safety goggles and rubber gloves to prevent skin contact and eye contact Ensure adequate measures are in place to avoid damage to peripheral units and or environmental contamination from exposure to leaking or splashing liquid Do not allow the module to come in contact with organic solvents or solvent vapors in...

Страница 8: ...ABS resin ABS resin Potting resin Polyurethane Polyurethane Polyurethane Gasket O ring EPDM EPDM EPDM Dimensions mm Use of End cap B at both ends 1 314L φ165 2 018L φ165 2 418L φ165 Use of End caps B and A at upper and lower ends respectively 1 234L φ165 1 938L φ165 2 338L φ165 Weight kg Filled with water 30 50 60 Without water 15 25 30 1 Consult Asahi Kasei for system operation under a pressure o...

Страница 9: ...escription Qty 1 Blind cap 1 2 Gasket 1 3 End cap 2 4 Protection cap 1 Permeate Outlet Discharge Outlet 1 2 3 Feed Water Inlet Label Module Housing Label indicating retentate outlet Label indicating feed water inlet 4 Alarming Label Japanese English ...

Страница 10: ...n of End cap B and an expansion joint or a combination of End cap A a ferrule and a clamp The discharge nozzle on the side of the module is connected through a combination of a union socket and sold separately a cap nut come with the module 2 3 1 List of Module Connection Parts Module Section Parts to Which to Connect Parts through Which to Connect Connection Pipe Diameter Top of Module Permeate o...

Страница 11: ...ced when its cap is loosened 5 10 years 4 5 10 years 4 5 years Cap A connection Parts O ring End cap A Nut 2 5S Sanitary Gasket 2 5S Clamp Estimated replace ment period 3 Consumable items Replaced when its cap is loosened 5 10 years 4 5 10 years 4 Consumable items Replaced when its cap is loosened 5 10 years 4 Union socket connection Parts Cap nut Gasket Union socket Expansion Joint Estimated repl...

Страница 12: ... on top of the module is connected to a rack permeate pipe through a combination of End cap B and an expansion joint No Parts Qty Remark 1 O ring 1 Sold separately 2 End cap B 1 Sold separately 3 Nut 1 Sold separately 4 Expansion joint 1 Sold separately 4 3 2 1 ...

Страница 13: ...s connected to a rack feed pipe through a combination of End cap A a ferrule and a clamp No Parts Qty Remark 1 O ring 1 Sold separately 2 End cap A 1 Sold separately 3 Nut 1 Sold separately 4 Sanitary gasket 1 Sold separately 5 Clamp 1 Sold separately 2 5S ferrule Connected to a rack feed pipe 1 2 3 4 5 ...

Страница 14: ...inlet at the bottom of the module is connected to a rack feed pipe through a combination of End cap B and an expansion joint No Parts Qty Remark 1 O ring 1 Sold separately 2 End cap B 1 Sold separately 3 Nut 1 Sold separately 4 Expansion joint 1 Sold separately 3 1 2 4 ...

Страница 15: ...e Nozzles The discharge nozzle on the side of the module is connected to a rack discharge pipe through a union socket No Parts Qty Remark 1 Cap nut 1 Sold separately 2 Gasket 1 Standard attachment 3 Union socket 1 Sold separately 1 3 2 ...

Страница 16: ...r falling prevention as a falling module may cause injury or damage to the module Do not fasten the chains too tightly as such action may cause module damage Keep the chains slack as illustrated in the above figure Keep a distance of 5 to 10mm between the module and the angle bar on which a chain is fixed Effluent Collection Header Pipe Permeate Collection Header Pipe Toppling Prevention Chain Air...

Страница 17: ...dride Chlorobenzene etc Fatty series amine Amides Dimethylformamide DMF Dimethylacetamide DMAC etc Cyclic amine Aromatic series amine Pyridine etc Nitriles Acetonitrile N methyl 2 pyrrolidone NMP etc Cyclic ketone Cyclohexanone Thinners Thinners Esters Ethyl acetate Butyl acetate Diethyl phthalate etc Ethers Isopropyl Ether Ethyl ether etc Ketones Acetone Methyl ethyl ketone MEK etc Aromatic serie...

Страница 18: ... module caused module cracks In a case where hot water is fed to modules soft PVC sheets used as a cushion when modules are fixed with U bolts caused module cracks migration of plasticizer Organic solvents may be used depending on their types and concentrations Consult Asahi Kasei about solvents or chemical agents other than or the details of the above chemicals Warning Do not allow the module to ...

Страница 19: ...e substance String like substance Wire String Straw Resin film Resin fragment etc These substances entwine the membrane which defeats the purpose of air scrubbing inducing membrane clogging Large substances such as metal piece resin fragment wood splinter tree branch and nut 0 5mm These substances get stuck in the membrane bundle which can damage the membrane leading to membrane rupture Hair Fiber...

Страница 20: ...in pipe lines may seriously damage the membranes Residual oils may cause membrane fouling Locating the System Protect the modules from direct sunlight and ultraviolet light as they may degrade and damage plastic components such as the housing module head skirt and membrane Please contact us if outdoor use is intended Warning Protect the modules from direct sunlight and ultraviolet light as they ma...

Страница 21: ...solution is highly corrosive to metals and should be thoroughly rinsed off with water e g tap water if contacted with peripheral piping or metallic frame components If End cap A stainless steel is used at the bottom of the module for connection as illustrated in Figure 9 ensure that the calcium chloride solution is fully drained and take extra care not to allow the solution to adhere to any metal ...

Страница 22: ...chieved throughout the entire system about 10 minutes 4 Then drain the water in the tank and modules 5 Repeat Steps 3 and 4 several times 6 Completion of rinsing is determined by measuring the Ca concentration or the hardness Alternatively rinse completion may be determined by observing the conductivity difference between the rinse water and permeate See pages 23 and 24 for standard conductivity v...

Страница 23: ...ermeate rate lower than the design value to prevent membrane fouling during rinsing When the permeate volume in one cycle permeate flux x filtration duration time has reached the design volume perform physical cleaning backwashing with air scrubbing 4 Completion of rinsing is determined by measuring the Ca concentration or the hardness Alternatively rinse completion may be determined by observing ...

Страница 24: ... void of taste Water with elevated hardness is harsh has poor soap foaming lathering capability and could also cause dysentery Tap Water Standard Recommended range for drinking water in Japan Soft Water Hard Water Hardness mg l 300 10 100 100 100 Conductivity Electrical conductivity in water increases with impurities in the water The higher the conductivity of water the more ion component the wate...

Страница 25: ...ter flow rate on permeate side 0 5m3 hr Rinse water flow rate on discharge side 0 5m3 hr Rinse results Figure 5 Relationship between Rinse Volume and Ca Concentration Fig 6 Figure 6 Relationship between Rinse Volume and Ca Hardness Ca Concentration mg l Rinse Volume L Ca Concentration as CaCO 3 mg l Rinse Volume L ...

Страница 26: ...e Item Unit UNA 600A UNA 660A UNA 620A Capacity of 1 Piece of Dunnage Module 20 16 16 Dunnage Size W mm 1 340 1 180 2 290 D mm 1 160 1 900 1 170 H mm 1 647 1 235 1 275 Dunnage Weight kg About 70 About 70 About 120 Dunnage Weight with Modules Held at Full Capacity kg About 380 About 450 About 570 Precautions Modules must not be subjected to sudden impact mechanical shock or vibration as it may resu...

Страница 27: ...ed in place of modules for system transportation System Cleaning before Test Operation Thoroughly clean the entire system prior to trial operation Foreign matter such as metal shards in the tank or in pipe lines may seriously damage the membranes Residual oils may cause membrane fouling Locating the System Protect the modules from direct sunlight and ultraviolet light as they degrade and damage pl...

Страница 28: ... used for a structure or a contour reason the feed inlet may be plugged with a plastic sheet and tape 6 6 Ensure that the tape to fix the plastic sheet does not contact the module housing Contact of tape with the housing may cause crack ろ過水出口側 ビニールでの封止例 ブラインドプレート取付け例 Sealing with a Plastic Sheet 供給水入口側 Example of Blind Plate Attachment Feed Water Inlet Permeate Outlet Sealing with a Plastic Sheet ...

Страница 29: ...n remove the cap nuts from both ends of the module 5 Attach an end cap to each end of the module and wrap the following tape 7 7 to 8 times around the junctions between the caps and the housing pipe Tape used Shinetsu Kogyo made Fitwrap SF 0530 with a width of 50mm and a length of 300m Example End Cap Attachment Feed Inlet 6 Put the module in a PE bag specifically for the UNA series and seal the m...

Страница 30: ...se 2 Storing the Module Online Filling the module with water and sealing it for storage Cleaning 1 Fill up the module with water and close the valves around the module to seal 9 2 Before starting actual operation circulate solution with about 100 mg l sodium hypochlorite through the module with the solution returning to the feed tank for cleaning Periodic Backwash with Sodium Hypochlorite If the s...

Страница 31: ...r measures are taken when there is possibility of remaining hazardous material in the module When modules are to be incinerated at temperatures in excess of 800 C ensure that the system is capable of treating and neutralizing exhaust gases which may contain hydrogen fluoride Alternately modules may be disposed of at an appropriate industrial waste landfill facility Warning Wear protectors when cut...

Страница 32: ...d be placed at the bottom and the head marked Reject at the top Modules must not be subjected to sudden impact mechanical shock or vibration as it may result in damaged membranes even if there is no damage to the housing 5 1 Installing Module Parts 1 Unpack the module from the shipping carton and remove the plastic bag 2 Remove the top and bottom End Caps and the cap nut of the upper retentate noz...

Страница 33: ...placement 2 Align End cap B with the module end face on the permeate side Note Check that the O ring is snugly placed in the groove without any displacement 3 Tighten the nut while pressing End cap B against the module Note End cap attachment requires a special torque wrench and an assembly fixture 4 Set the tightening torque of the torque wrench to 120N m ...

Страница 34: ...cap with a torque wrench until the torque wrench clicks Note Pay attention to the direction in which to rotate the torque wrench Note that a different tightening torque is used for dummy module For dummy modules 200N m ...

Страница 35: ...isplacement 2 Align End cap A with the module end face on the feed side Note Check that the O ring is snugly placed in the groove without any displacement 3 Tighten the nut while pressing End cap A against the module Note End cap attachment requires a special torque wrench and an assembly fixture 4 Set the tightening torque of the torque wrench to 120N m ...

Страница 36: ...cap with a torque wrench until the torque wrench clicks Note Pay attention to the direction in which to rotate the torque wrench Note that a different tightening torque is used for dummy module For dummy modules 200N m ...

Страница 37: ... workers to prevent injury Caution Put a chain round each module for falling prevention as a falling module may cause injury or damage to the module Caution Do not tighten the module toppling prevention chains too firmly but keep them loose Overtightening the chain may damage the module housing Keep a distance of 5 to 10mm between the module and the angle bar on which a chain is fixed Caution Use ...

Страница 38: ...of the expansion joint by hand Tightening the nuts with a tool may force them and deform the gasket causing leakage Check for leak after tightening the nuts If leak is observed tighten the nuts further Nut Sleeve Gasket Main body Packing Sleeve Nut Put a gasket on one end face of the main body Put a sleeve on the gasket Put a nut on the sleeve and lightly tighten it Put a gasket on the other end f...

Страница 39: ...rkers and they take precautionary measures against back trouble 2 After mounting the module put a chain round the module to prevent module falling Note Be sure not to tighten the chains too firmly but rather make them slack As a rule do not use U shaped bands to fix the module 3 1 Mount a gasket on the rejection side nozzle of the module Orient the nozzle with the rejection pipe and fasten the cap...

Страница 40: ...he End cap B nozzle and lightly tighten the nuts Note Ensure that the permeate pipe and the End cap B nozzle are sufficiently inserted into the expansion joint Leave a clearance of 30 to 50 mm between the nozzle end and the permeate pipe end If the cap nozzle and the permeate pipe are not sufficiently inserted leakage may occur from the nut sections 5 1 Tighten the clamp sufficiently to seal 2 Ope...

Страница 41: ...ot fall 2 Place the module on the installation base with the flat surface of the lower cap making contact with the base Note Position the discharge nozzle of the module in line with the discharge pipe Ensure that the work is performed by two or more workers and they take precautionary measures against back trouble 3 After mounting the module put a chain round the module to prevent module toppling ...

Страница 42: ... the rack and lightly tighten the nut so that the expansion joint does not fall 2 Set the module in place loosen the expansion joint nuts slide the entire joint downward onto the End cap B nozzle and lightly tighten the nuts Note Ensure that the permeate pipe and the End cap B nozzle are sufficiently inserted into the expansion joint Leave a clearance of 30 to 50 mm between the nozzle end and the ...

Страница 43: ...and the expansion joint Otherwise the module cannot be placed on its installation base from the side as the cap and the expansion joint interfere with each other The pipe onto which the expansion joint is inserted must be long enough to allow the expansion joint to slide along the pipe more than 135mm Figure 8 Expansion Joint Connection Air feed nozzle Distance traveled by expansion joint at least...

Страница 44: ...to the connection pipe 5 Loosen and remove the connection parts ferrule clamp for End cap A and expansion joint nuts for End cap B at the bottom of the module while ensuring that the module remains upright does not fall 6 Remove the chain from the module 7 Remove the module Caution Due to the high weight of modules they should be handled by two or more workers to prevent injury Caution Be sure to ...

Страница 45: ...e housing Raw Water Feed Pressure 300 kPa or lower TMP Transmembrane Pressure 300 kPa or lower The feed inlet pressure is the pressure the module housing withstands Note that even when the feed inlet pressure is less than 300 kPa if a negative pressure is formed on the permeate side such as that due to siphon effect the transmembrane may exceed 300 kPa Use the following formula to obtain TMP TMP P...

Страница 46: ...m3 hr module 10 AS Air Scrubbing BW Backwash Air Flow Rate 5 Nm3 hr module Ensure that the air feed pressure falls within the range of 180 to below 200 kPa Low air pressure will not overcome the water pressure failing to generate a sufficient amount of air Be sure to adjust the air flow rate within plus and minus 10 of 5Nm3 hr Flow Rate Limit for Flushing FL 6m3 hr module Caution Avoid shocks of t...

Страница 47: ...mg L of sodium hypochlorite from the module inlet during this period Filtration Cycle 30min cycle Filtration AS BW FL cycle 20 60 min AS BW Duration 1 min Backwas h flow rate 3m3 hr module Backwash flow rate 0 5 to 1 5 times the permeate flux Minimum flow rate m3 hr module UNA 600A UNA 660A UNA 620A 1 0 1 6 2 0 Flow rate limit for backwash 8m3 hr Dependent on operating parameters Air flow rate 5Nm...

Страница 48: ...s or punched hole sizes before feeding raw water to the modules Mesh hole sizes Raw Water Type Mesh Hole Sizes μm Natural Water 500 Sewage Secondary Effluent 500 Seawater 200 7 2 2 Filtration Process A constant flow filtration operating protocol is usually employed Permeate flux is constantly monitored with a flowmeter not shown in Fig 9 on the permeate side and maintained constant by sending feed...

Страница 49: ...0 10 60 10 30 10 AV 1 Raw water feed valve AV 2 Filtration valve AV 3 Backwash valve AV 4 Return valve AV 5 AS BW drain valve AV 7 Air supply valve P 1 Filtration pump P 2 Backwash pump P 4 Sodium hypochlorite injection pump Air Compressor Turns on and off in accordance with pressure settings ON or Valve opens OFF or Valve closes Circulated Water Permeat e Raw Water Tank EFM CIP AV 1 AS BW NaCl Ai...

Страница 50: ...モジュール入口圧力 Pressure on permeate side 2 240kPa 260kPa 50kPa 200kPa In this case the allowable TMP is 200kPa the maximum pressure recommended A filtration system under this condition can therefore produce the design permeate flux stably The basic design of membrane filtration facilities such as flux and module count proposed by Asahi Kasei calls for operation under a transmembrane pressure of up to 2...

Страница 51: ...r volumes 0 5 to 1 5 times the volumes of water held by the modules If the volume of backwash water is insufficient sodium hypochlorite added for backwash does not reach modules leading to insufficient backwash effect Ensure that the backwash water volume is larger than the volume of water held by the modules holdup volume Also ensure that the port to add chemicals to backwash water is as close to...

Страница 52: ...ne addition Air Scrubbing Designing an Air Scrubbing Unit Simultaneous Backwash and Air Scrubbing a big operational advantage of Asahi Kasei s membrane modules exerts greater cleaning effect than when backwash and air scrubbing are performed separately Adhere to the unit configuration illustrated in Fig 12 when designing an air scrubbing unit Failure to observe the standard may prevent the require...

Страница 53: ...ressures or temperatures outside the ranges mentioned the following correction is required Q1 Q0 T 273 2 P 0 10332 T 273 2 P 0 10332 1 0 0 1 Q1 Actual flow rate Q0 Reading on the scale P1 Actual measurement pressure MPa P0 Designated measurement pressure MPa T1 Actual measurement temperature C T0 Designated measurement temperature C Example The designated measurement pressure and temperature are 1...

Страница 54: ...ce the volume of raw water fed must be 1 5 the amount of the water contained in the modules With the standard cleaning protocol filtration pumps are used for flushing so that the flushing water volume is the sum of permeate and discharged water volumes If the amount of water used for flashing is small the turbid water in the modules is not sufficiently discharged Ensure that the amount of water us...

Страница 55: ...dule drainage of water from the module and piping 2 Hold an air pressure of 180 kPa or higher but lower than 200 kPa for not more than 3 minutes 3 Perform filtration to prevent membrane drying Perform Steps 1 to 2 within 10 minutes Upon completion of testing immediately fill the module with water and run water through the module such as by performing filtration Further performing a pressure hold t...

Страница 56: ...tension of the water being held in the membrane pores This results in the air pressure in the system to remain almost constant when the membranes have integrity The pressure will decay if there is a defect such as broken fibers as air can pass through such defects Leak judgment criterion Item Pressure Decay Rate Amount of Pressure Decay after 3 min No Leak Slower than 5 kPa min Less than 15 kPa Le...

Страница 57: ...igure 16 Step 1 for PDT No Parts No Parts AV 1 Raw water feed valve AV 7 Air supply valve AV 2 Filtrate valve AV 8 Chemical supply valve AV 3 Backwash valve AV 9 Return valve on chemical drain side AV 4 Return valve AV 10 Return valve for chemical drain on permeate side AV 5 Drain valve AV 11 Air supply valve for leak testing AV 6 Drain valve AV 12 Air bleeding valve for leak testing Compressor Re...

Страница 58: ...arts No Parts AV 1 Raw water feed valve AV 7 Air supply valve AV 2 Filtrate valve AV 8 Chemical supply valve AV 3 Backwash valve AV 9 Return valve on chemical drain side AV 4 Return valve AV 10 Return valve for chemical drain on permeate side AV 5 Drain valve AV 11 Air supply valve for leak testing AV 6 Drain valve AV 12 Air bleeding valve for leak testing AV 5 AV 4 AV 10 AV 2 AV 3 AV 12 AV 8 AV 7...

Страница 59: ...e valve AV 8 Chemical supply valve AV 3 Backwash valve AV 9 Return valve on chemical drain side AV 4 Return valve AV 10 Return valve for chemical drain on permeate side AV 5 Drain valve AV 11 Air supply valve for leak testing AV 6 Drain valve AV 12 Air bleeding valve for leak testing AV 5 AV 4 AV 10 AV 2 AV 3 AV 12 AV 8 AV 7 AV 1 AV 6 PI I PIA I FI I TI I PICA PI Air Vent AV 11 AV 9 Feed Tank Chem...

Страница 60: ...lve on chemical drain side AV 4 Return valve AV 10 Return valve for chemical drain on permeate side AV 5 Drain valve AV 11 Air supply valve for leak testing AV 6 Drain valve AV 12 Air bleeding valve for leak testing AV 5 AV 4 AV 10 AV 2 AV 3 AV 12 AV 8 AV 7 AV 1 AV 6 Feed Tank PI I PIA I FI I TI I PICA Chemical Tank Permeate Tank Drain Air Air Air Vent Chemical Pump Filtration Pump AV 11 AV 9 BW P...

Страница 61: ...ed The air leak test leverages membrane characteristics where the small membrane pores do not allow air to pass through due to the surface tension of the water held in the pores If the membrane has a problem such as rupture air bubbles are observed through the expansion joint otherwise no bubbles are observed If one hollow fiber breaks several liters of air leaks from the breakage per minute Note ...

Страница 62: ...dule 6 The following are the leak criteria 11 Item Continuous Air Bubble Occurrence No Leak None Leak Present Air bubbles occur 7 If a leak is found with a module repair the module s leaking section or replace the module Figure 20 Step 1 for Air Leak Test 11 Note that small air bubbles observed through the expansion joint may be due to the air remaining in hollow fibers AV 5 AV 4 AV 10 AV 2 AV 3 A...

Страница 63: ...als of about one second until the applied pressure decreases to below 10 kPa 11 Filtration process resumes after the air pressure drops below 10 kPa reading of PICA Figure 21 Step 2 for Air Leak Test AV 5 AV 4 AV 10 AV 2 AV 3 AV 12 AV 8 AV 7 AV 1 AV 6 PI I PIA I FI I TI I PICA PI Permeate Tank Drain Air Air Filtration Pump AV 11 AV 9 Feed Tank Chemical Tank Air Vent Chemical Pump BW Pump Compresso...

Страница 64: ...the air inside the hollow fibers out If air bubbles remain on the permeate side it is difficult to determine whether or not air bubbles are from a leaking section In this case perform filtration to completely push the air in the hollow fibers out before integrity testing No Leak Leak Figure 22 Air Leak Test Process Air Air Air Air Continuous Air bubbles No bubbles ...

Страница 65: ...edure Step Work Description 1 Remove the module from the system and remove the end cap only on the permeate side 2 1 Install the module back in the system 2 Secure the feed water inlet end to the unit 3 Install a blind plate to the discharge nozzle and secure the blind plate with a cap nut If no cap nut is available close the valve on the discharge side Blind plate Cap Nut ...

Страница 66: ... unit 2 Observe for a continuous stream of bubbles that would identify a leaking membrane 3 Repair isolate the leaking membrane by inserting a special stainless steel brad into the leaking fiber s end Note Ensure that the air pressure during testing is below 200 kPa Membrane may be dried with higher pressures Repair work is easier at lower pressures Adjust air valve as required 5 Insert hammer in ...

Страница 67: ... check and observe Note To ensure safety do not observe the module end face from directly above when pressurizing 8 Check that no consecutive air bubbles are present Consecutive air bubbles Module is defective Absence of consecutive air bubbles Module has integrity Note Intermittent bubble occurrence during the initial stage of pressurization is not abnormal ...

Страница 68: ...ations Consult Asahi Kasei when cleaning is not effective with these solutions 9 1 1 Contaminants and Applicable Cleaning and or Disinfecting Agents Contaminants and applicable cleaning and or disinfecting agents Contaminant Cleaning Agent Cleaning Agent Concentration Fungi Organic Compound Sodium hypochlorite Less than 5 000mg l 0 5 Organic Substance Colloidal Silica Sodium Hydroxide 4 Inorganic ...

Страница 69: ...ecovered by cleaning the membrane with alkali to remove organic substances and then with acid Standard chemical cleaning 2 500mg l NaClO 1 NaOH 6 to 8 hrs Rinse 1 Citric acid 1 to 2 hrs Rinse Chemicals Substance Difficult to Remove Effluent Treatment Toxicity Corrosive Nature Nitric Acid HNO3 Mn cannot be removed Easy only neutralization Poison Corrosive Hydrochloric Acid HCl Mn cannot be removed ...

Страница 70: ...hanced Flux Maintenance or CEB Chemical Enhanced Backwash is performed for light cleaning and CIP Cleaning In Place for heavy cleaning Performing EFM or CEB enables operation at higher permeate fluxes and lower pressures as compared with the implementation of CIP only The following figure shows general ideas of EFM and CIP Figure 23 Conceptual Illustration of EFM and CIP EFM CIP EFM Example of EFM...

Страница 71: ...ry in modules for membrane soaking Further in the former case chemical solution can be discharged only from the discharge outlets of modules or from both the discharge and permeate outlets of modules Which method to employ depends on the raw water type CEB EFM stationary soaking EFM chemical solution returned from discharge port EFM chemical solution returned from both discharge port and permeate ...

Страница 72: ...o the below sequences for EFM CEB and CIP For CIP follow the procedure for EFM or CEB whichever is chosen CEB Flow EFM Flow Repeat when using other chemicals Perform AS BW Stop System Drain Supply Chemical Leave for Predetermined Time Rinse BW Drain Perform AS BW Fill water FL Measure effluent pH residual chlorine concentration End of rinse End of CEB Repeat when using other chemicals Perform AS B...

Страница 73: ...AV 5 AS BW drain valve AV 6 Drain valve AV 7 Air supply valve P 1 Filtration pump P 2 Backwash pump P 3 Chemical pump P 4 Sodium hypochlorite injection pump Air compressor The processes and durations shown here are typical examples What processes and durations to employ depends on the system Be sure to employ appropriate processes and durations for your system ON or Valve opens OFF or Valve closes...

Страница 74: ...ve AV 3 Filtrate valve AV 4 Backwash valve AV 5 AS BW drain valve AV 6 Drain valve AV 7 Air supply valve P 1 Filtration pump P 2 Backwash pump P 3 Chemical pump P 4 Sodium hypochlorite injection Pump P 5 Acid injection pump Air compressor Turns on and off in accordance with pressure settings The processes and durations shown here are typical examples What processes and durations to employ depends ...

Страница 75: ...rom both discharge port and permeate outlet Figure 26 EFM Process Flow Diagram Effluent Permeate Feed Tank Chemical Tank AV 1 AS BW NaNCl Air Compressor AV 4 AV 2 P 1 P 2 P 4 AV 7 AV 5 AV 3 Auto Strainer AV 6 P 3 AV 9 AV 10 AV 8 NaClO ...

Страница 76: ...ly valve AV 8 Chemical supply valve AV 9 Return valve on chemical drain side AV 10 Return valve for chemical drain on permeate side P 1 Filtration pump P 2 Backwash Pump P 3 Chemical pump P 4 Sodium hypochlorite injection pump Air compressor Turns on and off in accordance with pressure settings The processes and durations shown here are typical examples What processes and durations to employ depen...

Страница 77: ...in valve AV 6 Drain valve AV 7 Air supply valve AV 8 Chemical supply valve AV 9 Return valve on chemical drain side AV 10 Return valve for chemical drain on permeate side P 1 Filtration pump P 2 Backwash Pump P 3 Chemical pump P 4 Sodium hypochlorite injection pump Air compressor Turns on and off in accordance with pressure settings The processes and durations shown here are typical examples What ...

Страница 78: ...rates chlorine gas Cleaning Protocol Preliminary cleaning Item Parameter Air Flow Rate 5 Nm3 hr module Duration 1 min Procedure Simultaneous Air scrubbing Backwash AS BW 1 min Perform under normal operating conditions Repeat several times if the membrane is heavily contaminated Dilution water rinse water Dilution Water Rinse Water UNA treated Water Tap Water RO treated Water UNA treated Water Tap ...

Страница 79: ...ce Chemical Solution Volume 40 50 60 70 75 Unit L module EFM CEB Protocol light cleaning Standard protocol NaClO EFM Step Cleaning Type Chemical Used Concentration Cleaning Duration hr Single Alkali NaClO 0 05 1 Acid EFM Step Cleaning Type Chemical Used Concentration Cleaning Duration hr Single Acid Acid 1 0 1 Acid cleaning Acids such as oxalic acid citric acid and nitric acid can be used These ar...

Страница 80: ...raise it at a rate of 10 C or less per minute Water Rinsing Rinse the chemical solution in modules by backwash or by flushing with rinsing water Item Protocol Rinse Water Flow Rate 3 6m3 hr module Rinsing Volume CEB EFM 200 300L module Piping volume CIP 400 500L module Piping volume Rinse Duration CEB EFM 3 8 min Duration for piping CIP 4 10 min Duration for piping Rinse Completion Completion of r...

Страница 81: ...ous injury to eyes and skin Warning Do not mix sodium hypochlorite and acids when both are used in a cleaning protocol Mixing of these chemicals may generate lethal chlorine gas Assessing Post Cleaning Permeate Flux Recovery After cleaning use the below protocol to check permeate flux recovery Consult Asahi Kasei when recovery is inadequate Procedure 1 Initial permeate flux check In order to judge...

Страница 82: ...rature conversion table on the next page e g Tc 15 2 C is 1 272 which is at the intersection of 15 C on left vertical scale and 0 2 C on the upper horizontal scale 100 When measuring permeate flux set the discharge effluent flow rate to 1m3 hr or less per module If not the flux will not be measured correctly due to the variant pressure drop in the module The apparent flux will be higher than the a...

Страница 83: ...9 1 186 18 1 183 1 180 1 177 1 174 1 171 1 168 1 165 1 162 1 160 1 157 19 1 154 1 151 1 148 1 145 1 142 1 140 1 137 1 134 1 131 1 128 20 1 126 1 123 1 120 1 117 1 115 1 112 1 109 1 106 1 104 1 101 21 1 098 1 096 1 093 1 091 1 088 1 085 1 083 1 080 1 078 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 1 038 1 035 1 033 1 030 1 028 1 026 24 1 023 1 021...

Страница 84: ...n system design Requirement for additional product parameters or information on product use Microza Water Processing Division Performance Materials SBU Asahi Kasei Corporation Hibiya Mitsui Tower 1 1 2 Yurakucho Chiyoda ku Tokyo 100 0006 Japan Phone 81 0 3 6699 3227 Fax 81 0 3 6699 3449 Asahi Kasei Corporation reserves the right to revise these Operating Instructions without prior notice MICROZA i...

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