化学沉淀法处理重金属废水的研究进展

Chemical precipitation method for treating heavy metal wastewater

重金属不同于有机污染物,其不能够生物降解,长时间接触重金属(铬,铜,镍,汞,镉和铅)极易积累在生物体内。许多重金属具有致癌性和高毒性。化学沉淀法作为目前使用最为广泛的手段之一,在处理含重金属废水方面有很大的优势。本文综述了常见的3种化学沉淀法:加碱沉淀法,硫化物沉淀法,铁氧化物沉淀法在重金属废水处理中的进展,并对未来化学沉淀法的发展提出了展望。

Heavy metals are different from organic pollutants. They cannot be biodegraded. Long-term exposure to heavy metals（chromium, copper, nickel, mercury, cadmium, and lead）can easily accumulate in living organisms. Many heavy metals are carcinogenic and highly toxic. As the most widely used heavy metal treatment method, chemical precipitation method has a great advantage in the treatment of heavy metals. In this paper, three common chemical precipitation methods are summarized： the progress of alkali precipitation, sulfide precipitation and iron oxide precipitation in the treatment of heavy metal wastewater, and the future prospects of chemical pre-cipitation treatment of heavy metal wastewater are presented.