Membran Bio Reactror Cleaning

MEMBRANE BACKFLUSHING.

Frequency:

Each membrane bank must be back flushed weekly.

Method:

1.    Fill cleaning tank with technical water or permeate.

2.    Switch off crossflow pump.

3.    Isolate membrane bank from feed and bleed system.

4.    Open membrane bank to cleaning system.

5.    Direct the cleaning system return to pump to the reactor first stage.

6.    Operate the cleaning pump to discharge the tank contents.

7.    Fill the cleaning tank with technical water or permeate.

8.    Operate the cleaning pump to discharge the tank contents.

9.    Isolate the membrane bank from the cleaning system.

10.  Open the membrane bank to the feed and bleed system.

11.  Start crossflow pump.

12.  Check crossflow loop pressure in stable and within normal operating levels.

13.  Check bleed flow is stable and within normal operating levels.

MEMBRANE CLEANING.

Frequency:

Each membrane bank should be cleaned every 4 – 6 weeks (Monthly).

Method:

Part 1 – Setting up the bank

1.    Switch of crossflow pump.

2.    Isolate membrane bank from feed and bleed system.

3.    Open membrane bank to cleaning system.

4.    Direct the cleaning system return to pump to the reactor first stage.

5.    Direct the permeate via the three way valve on the permeate manifold from the bank to be cleaned to discharge to the cleaning tank.

Part 2 – Flushing

6.    Fill cleaning tank with technical water or permeate

7.    Operate the cleaning pump to discharge the tank contents.

8.    Fill the cleaning tank with technical water or permeate.

9.    Operate the cleaning pump to discharge the tank contents.

10.  Direct the cleaning system return to the cleaning tank.

Part 3 – Bio 40 cleaning

11.  Fill the cleaning tank with technical water or permeate. During the fill add 1 litre of part 1 chemical per membrane module in the bank to be cleaned.

12.  Run the cleaning pump for four hours.

13.  Direct the flow from the cleaning pump to the sludge tank.

14.  Allow the cleaning tank to be pumped to the sludge tank until the cleaning pump stops

15.  Direct the flow from the cleaning pump to the membrane bank.

Part 4 – Flushing

16.  Direct the cleaning system return to pump to the reactor first stage.

17.  Fill the cleaning tank with technical water or permeate.

18.  Operate the cleaning pump to discharge the tank contents.

19.  Fill the cleaning tank with technical water or permeate.

20.  Operate the cleaning pump to discharge the tank contents.

21.  Direct the cleaning system return to pump to the cleaning tank.

Part 5 – Clipclean cleaning

22.  Fill the cleaning tank with technical water or permeate, during the fill add 1 litre of the part 2 chemical to the cleaning tank.

23.  Run the cleaning pump for four hours.

24.  Direct the flow from the cleaning pump to the sludge tank.

25.  Allow the cleaning tank to be pumped to the sludge tank until the cleaning pump stops

Part 6 - Flushing

26.  Direct the flow from the cleaning pump to the membrane bank.

27.  Direct the cleaning system return to pump to the reactor first stage.

28.  Fill the cleaning tank with technical water or permeate.

29.  Operate the cleaning pump to discharge the tank contents.

30.  Direct the cleaning system return to run to the cleaning tank.

Part 7 - Disinfection

This part of the cleaning process is optional and may be excluded. However regular disinfection of the membrane banks and permeate system will help with control of the effluent quality in terms of faecal coliforms.

31.  Fill the cleaning tank with technical water, during the fill add 2-4 litres of Sodium Hypochlorite to the cleaning tank.

32.  Direct the permeate flow from the bank being cleaned to the permeate tank using the three way valve on the permeate manifold.

33.  Run the cleaning pump for half an hour.

34.  At the end of the half hour period the operator may choose to sample the circulating flow and analyse for chlorine content. If this is less than 1 mg/l increase the quantity of chlorine in step 31 during subsequent cleaning cycles. If the residual is very high the reduce the amount of Hypochlorite added.

35.  Direct the flow from the cleaning pump to the sludge tank.

36.  Allow the contents of the cleaning tank to empty.

Part 8 – Restarting the system

37.  Isolate the cleaned bank from the cleaning system.

38.  Open the cleaned bank to the feed and bleed system.

39.  Start the crossflow pump.

40.  Check crossflow loop pressure in stable and within normal operating levels.

41.  Check bleed flow is stable and within normal operating levels.

MEMBRANE DISINFECTION.

Frequency:

Each membrane bank should be disinfected as required by the system. In the event of a Idexx monitoring sample on the plant starting to show higher faecal coliform values a disinfection cycle will ensure that the system is cleaned and the effluent quality is maintained.

Note: This operation will increase the effluent chlorine concentration to greater than the permitted discharge level in some waters, for this reason it is preferable to carry this out outside 12 miles.

Method:

Note: The disinfection process is carried out with the permeate valve directed to the permeate tank.

Part 1 – Setting up and flushing the first bank

1.    Switch of crossflow pump on the bank.

2.    Isolate membrane bank from feed and bleed system.

3.    Open membrane bank to cleaning system.

4.    Direct the cleaning system return to pump to the reactor first stage.

5.    Fill cleaning tank with technical water or permeate

6.    Operate the cleaning pump to discharge the CIP tank contents.

7.    Fill the cleaning tank with technical water or permeate.

8.    Operate the cleaning pump to discharge the CIP tank contents.

9.    Direct the cleaning system return to the CIP tank.

Part 3 – Disinfecting the first bank

10.  Fill the cleaning tank with technical water or permeate during the fill add 2 – 4 litres of Sodium Hypochlorite.

11.  Run the cleaning pump to empty the CIP tank to low level.

12.  Isolate the disinfected bank from the cleaning system.

Note: A minimum contact time of 30 minutes must be allowed for each bank to ensure disinfection is complete. Thus the last bank to be disinfected must be held for a minimum of 30 minutes to ensure complete disinfection prior to returning the system to service.

Part 4 – Setting up and flushing subsequent banks

Repeat sections 1 – 9 for the second and subsequent banks

Part 5 – Disinfecting subsequent banks

Repeat sections 10 – 12 for the second and subsequent banks until all banks are off line and charged with disinfecting solution.

Part 6 – Flushing and returning first bank into service

13.  Allow the last unit charged to stand for 30 minutes.

14.  Open the first membrane bank to cleaning system.

15.  Direct the cleaning system return to pump to the reactor sludge tank.

16.  Fill the cleaning tank with technical water.

17.  Operate the cleaning pump to discharge the tank contents.

18.  Isolate the disinfected bank from the cleaning system.

19.  Open the disinfected bank to the feed and bleed system.

20.  Start the crossflow pump.

21.  Check crossflow loop pressure in stable and within normal operating levels.

22.  Check bleed flow is stable and within normal operating levels.

Part 7 – Flushing and returning subsequent banks into service

Repeat sections 13 - 22  until all banks are back in service.

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