水合二氧化锰混凝去除水中微量金属镉

Removal of Cd(Ⅱ) from Raw Water by Hydrated Manganese Dioxide

以实验室配水和松花江水为本底,考察了高锰酸钾还原法制备的水合二氧化锰对水中的微量重金属镉的混凝去除效能,探讨了水体pH值、浊度等对镉去除效果的影响以及水合二氧化锰去除水中重金属镉的机理。结果表明:水合二氧化锰对水中的微量镉具有显著的去除作用,3mg/L的水合二氧化锰对实验室配水和松花江水中镉的去除率达95%以上,是一种非常有效的去除水源水中微量镉的水处理药剂。

The effects of removal of Cd（Ⅱ） from raw water with hydrated manganese dioxide produced by reduction of KMnO4 were studied by coagulation experiments. The effects of pH value and turbidity of raw water on removal of Cd（ Ⅱ ） were investigated and the possible mechanism were discussed. The results showed that the hydrated manganese dioxide had excellent effect of removing Cd（Ⅱ） from raw water. The removal rate of Cd（ Ⅱ ） reached 95% with 3mg/L hydrated manganese dioxide. So the hydrated manganese dioxide was a kind of effective water treatment reagent for removing Cd（ Ⅱ）.