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What are the reasons for the decrease in resistivity during the operation of EDI ultra-pure water equipment?

Time:

Nov 12,2021

The reasons for the decrease in resistivity during the operation of EDI ultrapure water equipment are related to the water quality, pressure, flow rate, voltage, pollution of influent water quality, etc. The following is a brief description of the reasons for the decrease in resistivity of EDI ultrapure water equipment.

What are the reasons for the decrease in resistivity during the operation of EDI ultra-pure water equipment?
What are the reasons for the decrease in resistivity during the operation of EDI ultra-pure water equipment?

The reasons for the decrease in resistivity during the operation of EDI ultrapure water equipment are related to the water quality, pressure, flow rate, voltage, pollution of influent water quality, etc. The following is a brief description of the reasons for the decrease in resistivity of EDI ultrapure water equipment.

1. The effluent of reverse osmosis equipment is unqualified (including conductivity, hardness, variable metal, etc.)

If the salt content of raw water is high, it is recommended to use bipolar RO reverse osmosis equipment as pre-desalting, and its conductivity should be maintained at 1~3 μS/cm. The influent CO2 content is high, and it is recommended to use degassing membrane or degassing tower to remove CO2. pH deviation from neutral too much, the use of pH adjustment, so that the EDI influent pH value in 7~8 can be.

2. Problems in current control of EDI system

The working current increases, and the water quality of the produced water is getting better. However, if the current is increased after increasing to the high point, due to the excessive amount of H and OH-ions generated by water ionization, a large number of surplus ions act as current-carrying ions for conduction, and at the same time, due to the accumulation and blockage of a large number of current-carrying ions in the process of movement, and even reverse diffusion, the water quality of the produced water is reduced.
3. pH change

The influent CO2 content of the EDI system is high. If the CO2 content is greater than 10ppm, the EDI system cannot prepare high purity water (emphasis).

Key words:

water equipment

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