China Nonferrous Metallurgy

Heavy metals in wastewater have the characteristics of refractory, long-term accumulation, toxicity, metabolic difficulties and concealment, which poses a risk to the ecological environment and human health.At present, the commonly heavy metal wastewater treatment methods include dilution method, chemical precipitation method, coagulation-flocculation method and adsorption method. In this paper, the mechanism of heavy metal removal, application advantages and disadvantages and progress of these methods are introduced in detail. It is pointed out that there are some problems such as high operating cost, incomplete treatment and possible secondary pollution.It is believed that the combined treatment technology of wastewater treatment-heavy metal recovery can solve the current compound pollution problem and achieve good economic and social benefits. It is also necessary to strengthen the research on the mechanism of water treatment technology, improve the repair process of heavy metal wastewater, and develop a wastewater treatment technology within the range of heavy metal content suitable for actual discharge.In addition, it is necessary to establish a long-term ecological station for environmental detection in vulnerable areas to provide basic guarantee for the remediation of heavy metal wastewater. Attention should be paid to the environmental effects in water treatment technology evaluation to avoid secondary pollution.