What is generally done with the mixed salts that come out of wastewater these days?
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Now, there is 100 tons of pharmaceutical wastewater per day, containing mixed salts such as sodium sulfate, sodium chloride, and sodium acetate. After evaporation, can it only be treated as solid waste? Is there a better way to handle this?
Thank you. How is salt typically separated in steps, for example, in the case of mixed salts such as sodium chloride and sodium sulfate? To obtain relatively pure sodium chloride with a low content of sodium sulfate.
I could ask the Xuzhou Water Treatment Research Institute; they currently treat the double salts in stages, converting them into dilute acids and dilute bases； It’s not an ad ； Just search on Baidu ； I have discussed this issue with them
Facing you and this waste water is quite contradictory. If mixed salts are crystallized, the cost of solid waste treatment is 3,000–5,000 yuan per ton; this amount is too high. If the salts are separated and then crystallized, the operating costs and investment expenses will double. Moreover, the recovered sodium sulfate costs 300 yuan per ton, and the same goes for sodium chloride – is it worth it? Moreover, no company in China is currently capable of performing salt separation crystallization very well. For many of my clients who recycle wastewater to produce sodium sulfate, I recommend that they extend their production process and use sodium sulfate to create caustic sulfide. The market price for caustic sulfide with 60% purity is 3,000 yuan, which is an option worth considering
In salt separation crystallization, sodium sulfate is usually obtained first through thermal crystallization, and then sodium chloride – the refined salt – is extracted gradually. However, with such a low water volume, only 4 tons per hour out of 100 tons per day, it’s even more difficult to carry out this separation
What are the subsequent processing steps? Could you please provide a more detailed description? Or you can message me privately at 729044923; I have a need for salt separation. Thank you.