Pickling wastewater usually needs to be neutralized and pretreated. The PH of the wastewater is adjusted to 6 ~ 9. Then it enters the VESALT scraper low-temperature vacuum drying crystallizer to evaporate and dry under vacuum low-temperature conditions, which can greatly reduce and remove the inorganic salts, heavy metals and COD contained in the waste liquid, and finally obtain dry solid crystals with moisture content of solid crystal salt can reach <15%. The clear and transparent distillate can be reused as water or treated to discharge standards. The evaporation rate of the equipment can reach more than 98%, the water quality is clear and transparent, and the acid washing wastewater is zero discharged.
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