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The pollution of EDI module is mainly divided into hardness, metal oxide, organic matter and biological pollution. If it is found that the pressure difference of EDI module increases, the flow of produced water, concentrated water or polarized water decreases, the voltage increases or the quality of produced water decreases, it indicates that EDI module may be polluted. The following small series will talk about the analysis and detection methods of specific faults.

Cause analysis of low resistivity of water production

1, the following operation conditions can be analyzed: the average current of each module; Actual current of each module; Pressure of fresh water chamber and concentrated water chamber; Traffic is too low; Operating trends over time.

2, can analyze the detection instrument: electrode constant; Check; Temperature compensation; Probe wiring; Instrument grounding; The flow rate of sampling through the probe is too small, which leads to poor sampling quality.

3. The following inflow parameters can be analyzed: conductivity; pH； Carbon dioxide; Silicon content; Hardness; Check the reverse osmosis equipment; Laboratory analysis of water quality.

The reason why the conductivity of produced water is greater than that of inlet water.

1. One or more module electrodes are reversed: the concentrated water chamber enters the fresh water chamber in reverse; Stop the operation of EDI system immediately and check the reason.

2. The pressure of concentrated water chamber is greater than that of fresh water chamber.

3. The current increases, but the water quality decreases.

Loss of ion exchange membrane, such as thermal damage; Mechanical damage.

The failure of EDI module should be analyzed and detected in time to avoid the damage and greater loss of EDI system.