污水污泥中重金属形态分析研究

The analysis of heavy metal forms in sewage sludge

采用stover连续提取方法对沈阳市北部污水处理厂的压缩污泥进行重金属提取,并对污泥中Cu、Zn、Cd、Mn、Ni和Pb等重金属之类的形态分布进行分析。结果表明:Cu主要以金属硫化物的形态存在,约占总含量的90.46%;Zn和Mn的形态分布主要为碳酸盐结合态、有机结合态和金属硫化物,Zn的以上三种形态约占总含量的99.11%,而Mn有机结合态约占总含量的52.89%;Cd和Ni主要以碳酸盐结合态、金属硫化物和可交换态形态存在,其中Cd的碳酸盐结合态约占总量的46.77%,Ni的以上三种形态约占其总量的95.02%;Pb以碳酸盐结合态为主要形态,约占总量的99.90%。

The stover sequential extraction method was used to analysis forms of heavy metals in compressed sludge of Shenyang Northern Sewage Treatment Plant,and the forms distribution of Cu,Zn,Cd,Mn,Ni and Pb were analyzed.The results showed that Cu was mainly existed in metal sulfides,about 90.46%of the total content;The forms distribution of Zn and Mn were mainly carbonate precipitate,organically bound and metal sulfides,which accounted for about 99.11%of Zn,and organically bound of Mn was about 52.89%of its total content;The forms distribution of Cd and Ni were mainly carbonate precipitate,metal sulfides and exchangeable forms,which were about 95.02%of Ni,carbonate precipitate of Cd was about 46.77%in its total content;Carbonate precipitate was the main form of Pb,about 99.90%of its total content.