How to effectively remove CaSO4?
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I want to use an evaporator to evaporate wastewater, but its high content of CaSO4 can easily lead to scaling. Does anyone have any tips on how to remove CaSO4? Thank you!
Since it is wastewater, calcium sulfite needs to be treated. Concentrate and crystallize gypsum~
How to concentrate? If it’s the thermal method, scaling occurs as soon as evaporation takes place. Moreover, even if gypsum crystals form, the CaSO4 content in the solution remains high, which is very detrimental to the subsequent evaporation process.
Vacuum multi-effect concentration is used; the temperature remains low, which reduces the risk of scaling, and the mother liquor resulting from crystallization in the last stage is recycled back for use.