摘要
以城市污水厂剩余污泥为研究对象,以连续提取法对其中8种主要重金属元素的化学存在形态进行了分析,结果表明:污泥中除Ni、Zn、Cd有超标和潜在的超标危险外,其它各金属的含量均低于国家标准的最高要求;污泥Ni、Cd具有相当的生物毒性,其余的元素生物有效部分较少,稳定性较好。总体来看城市污泥可通过降低超标重金属含量来实现农用的目的。
The excessing sludge from a municipal wastewater treatment plant was analyzed to study the heavy-metal stability with Sequential Extraction Technique,including the elements Cu,Zn,Ni,Cd,Cr,Hg,As and Pb.As a result,the contents of the rest element except Ni,Zn and Cd could fully accord with the state qualifications.On the other hand,the chemical state of each heavy metal showed that 6 elements of the 8 were stable because they had the lower active parts that were easily soluble in soil,whereas the element Ni and Cd had comparative biological poisoning.As a whole,this sludge could be used for agriculture if the contents of the poisonous heavy-metals were decreased.
出处
《广州化工》
CAS
2010年第11期163-164,199,共3页
GuangZhou Chemical Industry
关键词
城市污泥
重金属
农用污泥
municipal sludge
heavy-metal
sludge for agricultural use
