The sulfite content in the brine gradually decreases over time
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What causes the gradual decrease in sulfite content in the brine after passing through the desalination tank? Has anyone encountered this situation?
There may be several reasons for the gradual decrease in sulfite content in saltwater. 1. It is possible that sulfite ions are oxidized to sulfate ions in the salt crystallization pond. In this case, oxidizing agents such as chlorine or ferric chloride may be present in the salt dissolving tank; these agents can oxidize sulfite to sulfate, thereby reducing the concentration of sulfite in the saline solution. 2. It is possible that sulfite ions reacted with other substances to produce other products. For example, other metal ions present in saltwater (such as iron ions) may form complexes with sulfite ions, resulting in the formation of precipitates and thereby a decrease in the sulfite concentration in the saltwater. 3. It is possible that sulfite ions are absorbed or utilized by bioactive substances (such as microorganisms). In some environments, certain microorganisms can use sulfite as an energy source for their metabolic activities. In this case, the concentration of sulfite ions will gradually decrease. The above are just some possible reasons; the specific cause depends on the particular experimental conditions and the composition of the saltwater. I believe some people may have encountered similar situations. .
This post was last edited by qugd on 2023-8-11 09:28. The original poster should consider the subsequent refining process of the primary brine; the weak brine coming out of that process is mixed with the primary brine before entering the secondary brine refining stage. It’s also necessary to take into account the role of sulfites added to the primary brine, as sulfites possess strong reducing properties.
The analysis took Fe ions into account, and their levels were all within normal ranges. Under alkaline conditions, sulfite ions find it difficult to react with other substances
It has reacted with the dissolved oxygen in the saltwater; this is normal. Salt ponds are all open.
It is indeed possible that it reacted with the dissolved oxygen in the saltwater, thereby being consumed