Dechlorinated brine contains free chlorine under acidic conditions
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This post was last edited by sunjl1981 on 2013-1-6 at 23:24. Acid is added to the dechlorinated brine to adjust the pH to an acidic level; at this point, there is no free chlorine present. However, trace amounts of free chlorine often appear later on. Please analyze the reason for this. # ， ， &
I have a question: What is the next process step?
After dechlorination of the brackish water in the dechlorination tower using air blowing or vacuum dechlorination, sulfite is added to remove any remaining trace amounts of free chlorine.
The brackish water after chlorination removal (after vacuum and chemical removal) is made acidic by adding acid, with trace amounts of free chlorine present in the buffer tank. What is the reason for this?
Could it be that the chemical dechlorination wasn’t thorough enough? Was the amount of sodium sulfite added insufficient, was the pH not adjusted properly when adding sodium sulfite, or was the mixing uneven, resulting in residual chlorine from vacuum dechlorination not being removed? It’s hard to think of any other reasons.
Is there an internal leak in the dechlorinated brine tank, has it become contaminated? In which step was this detected?
I think it’s possible that insufficient amount of alkali was added during chemical dechlorination! It is recommended that you install a titanium mixer in the pipeline after adding alkali and sodium sulfite, and also calibrate the pH meter! The above views are personal opinions; my capabilities are limited and my analysis is insufficient. I look forward to guidance from experts!
After dechlorination, all parameters are normal; what reactions might occur? It is necessary to analyze this based on the components in the brackish water. Under acidic conditions, free chlorine reappears. What is this reaction mechanism?
Chlorates in saltwater are formed as a result of decomposition in the presence of acid; it is recommended that you analyze the chlorate content in the saltwater. P
What pH was achieved by adding acid? It might be related to the decomposition of chlorates, as mentioned above
I was also wondering what process requires adding acid to dechlorinated brine to make it acidic, as chlorates in the dechlorinated brine decompose in an acidic environment to produce free chlorine