Common problems and Solutions for EDI system

Problem 1- EDI module be oxidized

It will cause the breakage of resin to clog the flow path, resulting in a gradual drop in EDI permeate water capacity and chemical cleaning is useless to recover the performance.

Causes:

1) EDI feed water contains excess oxidizing substances due to pretreatment sterilization dosing

2) EDI feed water contains excess oxidizing substances produced by UV lamps

Solutions:

1) In the case of using sterilization dosing for pretreatment, add the reduction dosing before RO/EDI system

2) Ultraviolet sterilization device cannot be installed at the inlet of of EDI system

3) It is necessary to record operation parameters of instruments be used at ordinary times, so can deal with problem timely when found the parameters abnormal

Problem 2- EDI module be burned

The current and voltage of the EDI are obviously abnormal or cannot be powered on, and the quality of the EDI permeate water drops rapidly

Cause:

EDI powers up in case of feed water shortage

Solution:

EDI feed water should be set with flow protection and alarm. If automatic protection is not set, valve inspection and flow confirmation should be done manually.

Problem 3- EDI module be blocked

Causes:

1) Scaling or organic fouling cased by poor feed water quality, and bacterial growth due to long-term shutdown, resulting in a decrease in EDI permeate water capacity

2) Physical fouling at the inlet of EDI module because that the inlet pipe was not flushed before operation, and the EDI permeate water capacity decreased in a short time just after operation

Solutions:

1) Carry out chemical cleaning in a timely manner, regularly check the quality of EDI feed water, and rinse with clean water to avoid bacterial growth after long-term shutdown

2) Backwash the problem module with clean water

Problem 4- Other situations lead to the drop of EDI permeate water quality

Cause:

1) The positive and negative poles are reversed, the current and voltage display is normal, but the quality of permeate water is worse than feed water

2) Unreasonable pressure setting of EDI module

3) EDI feed water is acidic, and a small amount of carbon dioxide gas cannot be removed

4) It may be necessary to strengthen current regeneration after cleaning, long-term shutdown, or after a period of running water without electricity

Solutions:

1) Check the positive and negative poles of the power supply and adjust the wiring

2) Re-equip the EDI fresh water inlet pressure and select the appropriate pipe diameter

3) Use the pH dosing device to raise the pH of feed water to 8-9

4) Increased 3-4Ato operate while ensure the flow is normal, and then gradually reduce the current after the water quality be recovered

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