Pilot test and research of desalination in recycle water in copper smelting workshop
In order to realize Near Zero Emission and resource utilization in wastewater treatment,the reuse water from a copper smelting workshop was treated using a process involving biological agents,double alkali decalcification,reverse osmosis concentration,nanofiltration salt separation,electrodialysis concentration,and evaporation crystallization salt removal.The experimental result shows that the retention rate of SO42-reaches＞99％,the total soluble solids(TDS)of Na2SO4 in concentrated water reaches 179 g/L,and the TDS of NaCl in concentrated water can reach 150 g/L.After concentration and separation,Na2SO4 and NaCl salt product are precipitated,and Na2SO4 meets the requirements of Class Ⅱqualified product defined in GB/T 6009-2014 Industrial Anhydrous Sodium Sulfate,and NaCl meets the Class Ⅰ standard defined in GB/T 5462-2015 Industrial Salt Quality Standard.This process solves the problem of low concentration in recycled concentrated water and removes the impurities in Na2SO4 products,providing bases for the cost-effective engineering treatment of high salty wastewater in the non-ferrous industry.
NETL
NSTL
万方数据
维普
