There are large fluctuations in calcium and magnesium levels after the resin column
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This post was last edited by sunjl1981 on 2013-1-6 at 19:49. Current status: 1. Before entering the tower, the calcium level is around 500 PPb and the magnesium level is around 70 PPb. 2. The temperature of the saltwater is around 55 degrees. 3. The pH level is around 9 before the water enters the tower. Recently, the calcium and magnesium levels at the outlet of the resin tower have often been between 25-30 ppb; I would appreciate it if experts could help analyze this situation. Thank you. #hcbbs
Regenerate in double quantity, and then analyze it
Based on the indicators you provided, everything is within the control range! 1. Before entering the resin tower, the calcium and magnesium levels should generally be kept at around 1 ppm. 2. The operating temperature of the resin is between 50–60°C. 3. The pH value should generally be maintained between 9 and 10; as long as it does not exceed 11, magnesium ions will not exist in the form of magnesium hydroxide precipitates! You can analyze it from the following reasons: 1. Whether the quality of the brine is constant (based on the parameters you mentioned above). 2. Whether the resin column is regenerated thoroughly; if not, the calcium and magnesium absorbed by the resin cannot be removed (it is recommended to carry out regeneration using a larger amount of solution). 3. An excessive flow rate of the brine (this often occurs at full load), or uneven distribution of the brine. 4. Insufficient height of the resin (increase the amount of resin used). 5. Crystallization of the resin, with too much broken resin present (carry out backwashing at a high flow rate). 6. Resin poisoning (this is the worst scenario to encounter), as poisoned resin generally cannot be restored to its original condition! Poisoning by iron ions and free chlorine – my personal opinion; welcome to discuss
Please provide data such as the resin loading amount, loading height, brine flow rate, and service life of the resin; these details can be used to analyze the reasons for the excessive levels of calcium and magnesium. It is likely that there is a problem with the resin. We have specialized resin testing equipment and can provide resin testing free of charge. For details, please send an email to: china_zhangjun@163.com
Which tower do you play? I suggest using 3 towers
We operate two towers while one is in regeneration mode; generally, the levels of calcium and magnesium are high at the start of operation, but they drop after two or three hours of operation. Thank you for your reply
You’re using an online analyzer, right? It is said that that device performs liquid analysis at fixed intervals; this same issue has occurred with devices used in the past – the pH value appeared high right after the tower was started up, and it was also slightly high during each sampling analysis, before returning to normal after a while. When this situation first occurred, ICP analysis was carried out immediately for verification, and everything was fine; after that, it wasn’t given much attention anymore. For reference only; manual analysis should still be the standard.