Technical assistance: What to do if chloride levels in circulating water are high?
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This post was last edited by hesonchang214 on 2011-10-24 22:45. In catalytic circulating water systems, high levels of chloride ions and alkalinity lead to an increased dosage of chemicals, with little noticeable effect ； Waste discharge replacement – prices rise quickly! I wonder how everyone controls the parameters of circulating water??
Pay attention to the reasons for the high concentration, and then take targeted measures. Adding chemicals is one method, and replacement is another, but they are not the optimal methods. I used to be in charge of circulating water on site as well, and from that experience I can say that to manage circulating water effectively, it’s essential to prevent pollution, rather than focusing on adding chemicals properly. I wonder if others share this view?
Has fresh water rushed in? Generally, the chlorine level in fresh water is quite high.
Is it caused by excessive chlorine addition?
This post was last edited by cdpulin on 2011-10-24 at 11:04. First, identify the source of the chloride ions: either the chloride content in the water used for replenishing the circulating water is too high, or chloride ions are introduced during the water circulation process (due to leaks in equipment or pipelines), or the addition of chemicals containing chloride ions results in an elevated chloride level in the circulating water system. Only by preventing the abnormal introduction of chloride ions into the circulating water system at its source can chloride levels in the circulating water be significantly reduced. If nothing else works, then focus on chemicals, using chemical reactions and displacement to reduce chloride ions; however, this is a last-resort option and should not be used.
Chloride ions mainly come from make-up water used in production and from the use of chlorine for disinfection. 1. Strictly control the residual chlorine level in the circulating water system to prevent excessive addition of chlorine. 2. Sodium hypochlorite can be considered as a substitute for chlorine for disinfection, in order to reduce the chloride ion content. 3. What is the required level of chloride ions in your circulating water system? Our company keeps it below 600mg/l. 4. Are there any media containing chloride ions in the production process? :handshake
This post was last edited by hesonchang214 on 2011-10-24 22:46. Maybe the chlorine content in the raw water is too high?
This post was last edited by hesonchang214 on 2011-10-24 22:46. Chloride ions are indeed difficult to control, but they are absolutely crucial in circulating water!
This post was last edited by cdpulin on 2011-10-24 at 11:05. The chloride level in our fresh water is 135 mmol/l
The high chloride ion level is likely due to the high chloride ion concentration in the incoming water. Since the circulating water system has a concentration multiplication factor of around 2-3, the chloride ion concentration in the circulating water is 2-3 times that of the incoming water； In other aspects, the amount of disinfectant added is very small (the dosage is specified in ppm, and such an amount cannot affect the concentration of chloride ions) ； Therefore, it is still necessary to consider the approach from the perspective of water intake, as well as looking at the concentration ratio of your system ； The only methods for removing chloride ions are ion exchange or reverse osmosis; other chemical displacement methods are too costly! If the alkalinity is high, it can be treated with lime.