Cause analysis of high conductance of effluent water from RO water purification machine

A brief discussion on the reasons for the increase in the conductance of the water produced by the RO water purification machine may be caused by the following reasons, but not limited to them. This article mentioned that there is a prerequisite before the conductance of the RO membrane product water increases, that is, the new RO water purification machine has just been produced, and the pre-installed filter has been installed to meet the reverse osmosis water inlet conditions.

 The first reason: the RO membrane packaging polyethylene bag is damaged, and the vacuum sealing condition is broken, resulting in the growth of air-dried microorganisms in the RO membrane, affecting the performance of the RO membrane, and the conductivity of the product water may be too high. In this case, it is recommended to replace the RO membrane.

 The second reason: the RO membrane sealing ring is deformed or damaged, and concentrated water flows to the pure water side, resulting in an increase in the conductance of the product water. In this case, it is recommended to replace the new sealing ring.

The third reason: the RO membrane is good, the sealing ring is good, and the size of the membrane shell is slightly larger and cannot be effectively attached to the RO membrane; the performance is that the conductivity value of the produced water fluctuates from high to low, and it is recommended to replace it in this case. RO membrane.

 The fourth reason: the operating pressure must be equal to or not less than the inlet water/concentrated water pressure, otherwise the membrane damage caused by the back pressure during operation may also increase the conductance of the product water. In this case, it is recommended to replace the RO membrane.

 The fifth reason: the ratio of pure water to concentrated water, the flow rate of concentrated water will also affect the conductance of the produced water; the solution is to adjust the concentrated water valve when the water machine is running, and observe the flow rate and the conductance of the produced water while adjusting, and see that the conductance of the produced water reaches Numerical requirements are sufficient.

If the new RO water purification machine has the problem of increased conductivity of the produced water, please check against the above

 Attachment: Precautions for RO membrane storage

1. The box for storing membrane elements should be stored at room temperature and avoid direct sunlight.

2. During storage, transportation and system shutdown, the original membrane must be immersed in the protective solution to prevent biological growth and avoid freezing. Standard stock solutions contain 1% by weight sodium bisulfite and sodium metabisulfite (food grade). For short-term storage (one week or less), 1% by weight of sodium metabisulfite can prevent biological growth.

3. The unopened RO dry film (in a vacuum state) can be stored for a long time, and the general storage period of RO wet film should not exceed one year.

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