How should the alkaline slag wastewater resulting from high-temperature wet oxidation treatment be treated?
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The average level of volatile phenols is 650 mg/L, the COD is around 30,000 mg/L, sulfides are below 10 mg/L, and the salt content ranges from 8% to 16%. This wastewater has a very high salt content (mainly in the form of sodium sulfate or sodium sulfite), making it impossible for biochemical treatment systems to process it. It also has a high color intensity. How can this wastewater be treated so that its quality meets the requirements for direct evaporation crystallization, thereby reducing or eliminating the amount of mother liquor produced during the concentration process? I’m seeking advice.
Personally, I think sodium chloride can be added first, followed by electrolysis, and then multi-effect evaporation
What is the purpose of adding sodium chloride?