The conductivity of purified water equipment is an important indicator that reflects the cleanliness of the water produced by the equipment. Once the conductivity index is not within the standard value, the water quality will inevitably have problems. Today, the editor will learn about the unstable conductivity of purified water, which fluctuates from high to low?

The lower the conductivity of purified water, the higher the purity of water. The fluctuation of conductivity in purified water can seriously affect the standard of purified water and affect production efficiency. So we need to solve the problem in a timely manner based on the actual situation, to avoid greater losses caused by substandard water quality.

1. In general, the water treatment system is consistent with the initial state without any changes, and the conductivity increases.

The reason for the high conductivity at this time is that the aging of the reverse osmosis membrane components leads to a decrease in desalination rate. The correct solution is to replace the reverse osmosis membrane of the reverse osmosis host, which is usually replaced every 2-3 years

2. Other situations:

a. The conductivity of the equipment suddenly increases during normal operation, resulting in an increase in drainage volume.

This situation is caused by a sharp increase in conductivity due to leakage of the sealing ring connecting the reverse osmosis membrane component. It is recommended to replace the sealing ring. The specific method is to check the water quality of each membrane component and identify the leaking parts for replacement.

b. It is difficult to lower the secondary conductivity when the device is turned on, or the duration of the decrease is too long.

This situation is generally common in two-stage reverse osmosis, where sodium hydroxide is added between the first and second stages to regulate the removal of carbon dioxide in water. The amount of sodium hydroxide added is related to the conductivity, and it is recommended to adjust the amount added.

c. After running for a period of time, the water production of the equipment remains unchanged, the conductivity increases, and the drainage volume increases.

The membrane is degraded by an oxidizing medium, resulting in an increase in conductivity and the need to replace the membrane components.

d. The sand and carbon purification filtration effect of the pre-treatment equipment has decreased or failed, and there is no regular and timely backwashing (the inlet conductivity will relatively increase).

e. The filter element of the RO inlet security filter is dirty and blocked, and was not replaced in a timely manner, resulting in a large pressure difference.

f. The raw water quality is unstable, and the raw water quality has changed. The high conductivity of the raw water naturally affects the production of water.

g. The water temperature during water production is too high, and the inlet pH value is not within a reasonable control range.

h. The higher the purity of water, the stronger its ability to dissolve substances. When in contact with air, substances such as carbon dioxide, oxygen, and ammonia are easily and quickly dissolved, resulting in a rapid increase in conductivity.

3. In addition, the purified water equipment is a large system with other factors. It is recommended to identify and solve problems as soon as possible through daily operation records and analysis.

The above are common reasons for the unqualified conductivity of purified water. In addition, the conductivity standard does not equal the water quality standard of pharmaceutical purified water. The water quality of pharmaceutical purified water also includes other items detected in the pharmacopoeia, such as total organic carbon, heavy metals, microorganisms, etc. When the conductivity of purified water fluctuates, we need to identify the cause and take corresponding measures based on the actual situation to solve the problem. To avoid causing greater losses due to substandard water quality.

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