有机酸-铁锰氧化物体系对污泥重金属镉、铅去除研究

Removal of Lead and Cadmium from Sludge by Organic Acid Ferromanganese Oxide Yystem

活性污泥厂废水处理会产生大量剩余污泥,堆肥后的污泥可作为肥料和土壤改良剂在农业上再利用。然而,由于污泥中重金属含量高,需要对污泥中的重金属进行去除处理,才能实现污泥堆肥在农业上的再利用。探讨了不同有机酸去除处理污泥重金属镉、铅。研究了pH、浸提时间、铁锰氧化物/柠檬酸物质的量比(MnFe_(2)O_(4)/C_(6)H_(8)O_(7))对污泥重金属镉、铅去除率的影响。处理的最优化条件是p H为4,浸提时间为8 h,铁锰氧化物/柠檬酸物质的量比(MnFe_(2)O_(4)/C_(6)H_(8)O_(7))为2。

A large amount of excess sludge is produced from wastewater treatment of activated sludge plant,and the composted sludge can be reused as fertilizer and soil conditioner in agriculture.However,due to the high content of heavy metals in the sludge,it is necessary to remove the heavy metals in the sludge,so that the sludge compost can be reused in agriculture.The removal of cadmium and lead from sludge by different organic acids was studied.The optimum conditions were as follows:pH 4,molar ratio of ferromanganese oxide to citric acid 2,extraction time 8 h.