How to remove chloride ions from circulating water
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As the title suggests, what are simple and cost-effective ways to remove chloride ions from a circulating water pool? .
With such a large circulation volume, it’s difficult to remove. It can only be done at the source by using water with added moisture and fewer chloride ions, ensuring that the concentration isn’t too high.
Chloride ions in the main circulating water can cause corrosion of equipment, such as the copper pipes in chiller units. These chloride ions arise from the switching between circulating water and chilled brine during production, which is a real problem – no suitable solution has been found!
Change the water by adding fresh water to the tank; at the same time, drain water from the return pipe, thereby reducing the chloride content through displacement
When switching between circulating water and chilled water, drain the chilled water first, or use compressed air to evacuate it before introducing the cooling water. If possible, the two types of water follow different circuits. For example, a jacket and an inner coil.
Where did the CL- come from? It’s not tap water anyway
Our factory uses fresh water for circulating water; the chloride content in it is over 200, while that in the circulating water tank is over 400. How can we remove the chloride from there?
Most of the chloride ions come from the circulating water to which disinfectants are added. The maximum tolerance level for chloride ions in copper heat exchangers is 300. To reduce the chloride ion content, it is necessary, on the one hand, to enhance the drainage from the circulation tank and add fresh water; if the chloride ion level in the fresh water remains high, it is advisable to add some deionized water as well. On the other hand, the amount of chemicals added should be controlled while ensuring the quality of the circulating water. Currently, the commonly used oxidizing disinfectant is trichloroisocyanuric acid, which introduces a significant amount of chloride ions, with effects similar to those of hypochlorous acid. Therefore, it is important to conduct regular tests on water quality and make adjustments promptly.
I’ve learned it.* Electrodialysis can be used: the Hangzhou Water Treatment Research Center is working on it