The chloride content in the effluent from the anion bed is high
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The company has three sets of ion exchange systems capable of producing desalinated water at a rate of 75 tons per hour; under normal operation, the water production rate is indeed 75 T/H per unit. The raw conductivity of the water coming out of the anion exchange column is considered acceptable when it is less than 10 μm/cm. Therefore, when the anion exchange column stops working, the conductivity remains acceptable, but the silica concentration rises to 200 μg/L. Meanwhile, the chloride ion concentration remains around 2 mg/L throughout the operation period. It is desired to reduce the chloride ion concentration in the output water to below 1 mg/L. Recently, after replacing the resin in one of the anion exchange columns, the chloride concentration remains high. There is no difference compared to the effluent from the other two anion exchange columns. The chloride concentrations in both the feed water and the effluent from the cation exchange column are approximately 15-25 mg/l. What are the main reasons for the high chloride concentration in the effluent from this anion exchange column? How to solve it?
1. Poor resin regeneration or no regeneration at all. 2. Channeling in the resin bed. 3. Incorrect detection data or contamination of the sampling and analysis vessels. 4. Excessive chloride ions in the influent water