Seek an optimized scheme for the extraction of potassium sulfate from wastewater
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If the wastewater contains large amounts of inorganic salts (mainly potassium sulfate), apart from using distillation to separate the crystals (which is energy-intensive), there are no suitable equipment for electrodialysis. From an economic perspective, what methods can be used to obtain solid crystals? If salting-out is used to precipitate the crystals, how should the effects of temperature and solubility be taken into account?
I have an article titled “Treatment of Wastewater Containing Sulfuric Acid and Sulfates by Solvent Extraction,” but unfortunately it’s in PDF format and cannot be uploaded. The URL dspace.xmu.edu.cn/dspace/bitstream/2288/6456/1/溶济萃取法处理含硫酸及硫酸盐的废水.pdf might allow you to download it.
I studied this literature carefully; its principle still relies on evaporation, which requires a lot of energy and is not satisfactory. It seems that the best approach is to use salting out based on solubility. Thank you anyway