Ion exchangers are an important component of reverse osmosis purified water equipment. Its common faults include: the working exchange capacity of the heat exchanger decreases, and the cycle water volume decreases; Loss of heat exchanger during operation or regeneration backwashing; The water outlet of the heat exchanger has hardness throughout the entire softening process; The chloride ion content in softened water increases, and sometimes the softened water or regenerated wastewater appears yellow, indicating the formation of a sol in the heat exchanger.

1. Reduced the working exchange capacity of the heat exchanger and reduced periodic water production

Possible reasons are as follows:

(1) The high content of Fe3+and Al3+in the raw water causes poisoning of the exchange agent. At this point, the resin color changes to deep red****** The method is to use acid to clean the recovery agent.

(2) The backwash is not complete enough, and the exchange agent is contaminated by suspended solids, resulting in clumping and biased flow. The treatment method is to backwash or clean the exchange agent layer to minimize the content of suspended solids in the incoming water.

(3) The amount of regenerant is small, the activity concentration is low, and the steel ion content in the salt is low. The treatment method is to increase the amount or concentration of regenerant appropriately, and use industrial salt with high sodium content.

(4) The height of the heat exchanger layer is too low or the heat exchanger gradually decreases. The solution is to increase the height of the heat exchange layer appropriately.

(5) The regeneration flow rate is too fast or the regeneration method is incorrect. The processing method should strictly follow the correct regeneration method.

(6) The raw water quality suddenly deteriorates or the operating flow rate is too fast. The treatment method is to grasp the law of water quality changes and appropriately reduce the operating flow rate.

2. Loss of heat exchanger during operation or regeneration backwashing

Possible reasons are as follows:

(1) The drainage cap and other drainage devices are broken. The solution is to repair the drainage device and replace the drainage cap.

(2) There is too much backwashing. The treatment method is to observe the height of resin expansion during backwashing. When the resin expands close to the top, reduce the backwash strength appropriately.

Throughout the operation of the reverse osmosis pure water equipment, the effluent from the heat exchanger always has hardness

Possible reasons are as follows:

(1) The backwash valve or brine valve is leaking and not tightly closed. The solution is to repair the valve in a timely manner.

(2) The height of the heat exchanger layer is insufficient or the operating speed is too fast. The processing method is to add an exchange agent and adjust the operating flow rate.

(3) Exchange agent poisoning and deterioration, loss of exchange ability. The handling method is to handle or replace the exchange agent.

(4) The hardness of the raw water is too high or the concentration of sodium salts is too high. The treatment method is secondary softening.

(5) The testing reagent has a hardness or indicator malfunction. The handling method is to check or replace the reagents and carry out the experimental operation correctly.

4. Increase in chloride ion content in reverse osmosis purified water equipment

Possible reasons are as follows:

(1) The water valve is mistakenly opened during regeneration or the salt valve is mistakenly opened during operation. The method of handling is to operate with caution to prevent errors.

(2) The brine valve or outlet valve of the regeneration heat exchanger is leaking. The solution is to repair the valve in a timely manner.

(3) After regeneration, incomplete flushing or changes in water quality of the water source. The treatment method is to monitor whether the chloride content in the raw water increases after flushing, until the chloride content in the inlet and outlet water is basically the same.

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