The company has an ultrapure water equipment, recently found that the EDI module conductivity continues to fall from 6 megohms to 2 megohms, is very flat down. Look at the supplement

The pollution of EDI module is mainly divided into four kinds of hardness, metal oxides, organic matter and biological pollution. If the EDI module is found to increase the differential pressure, water production, concentrated water or polarized water flow rate decreases, voltage increases or lower quality of produced water, it is a sign that the EDI module may produce pollution, the following small talk about the specific fault analysis and detection methods.

Low resistivity of produced water cause analysis

1, you can analyze the following operating conditions: the average current of the module; the actual current of the module; fresh water chamber and the concentration of the chamber pressure; flow rate is too low; the trend of the operating conditions over time.

2, can analyze the detection instrument: electrode constants; calibration; temperature compensation; probe wiring; instrument grounding; sampling flow through the probe is too small and lead to poor sampling.

3, can analyze the following parameters of the feed water: conductivity; pH; CO2; silicon content; hardness; check the reverse osmosis equipment; laboratory analysis of water quality.

Produced water conductivity is greater than the cause of the conductivity of the feed water

1, one or more modules electrode reversal: concentrated water chamber reverse into the fresh water chamber; immediately stop the EDI system operation, and detect the cause.

2, concentrated water chamber pressure is greater than the fresh water chamber pressure.

3, the current increases, but the quality of the water produced by the decline in the reason

Ion exchange membrane damage, such as: thermal damage; mechanical damage.

The EDI module failure should be analyzed in a timely manner and timely detection, to avoid damage to the EDI system to produce greater losses.