蚯蚓对城市污水污泥中重金属的富集特征

摘要

利用桂林城市污水处理厂剩余活性污泥养殖蚯蚓 (赤子爱胜蚓), 研究了蚯蚓生物量的变化、 蚯蚓体内和试验后混合物中重金属含量、 蚯蚓对污泥中重金属的富集特征, 以及处理后蚯蚓产品的再利用.结果表明: 加入污泥以后蚯蚓体重增长极其显著; 蚯蚓体内的重金属含量显著低于混合物中重金属的含量, 两者的Cd、 Cu、 Pb正相关, Zn负相关; 重金属的富集顺序为 Cd>Zn>Cu>Pb; 投加污泥以后, 蚯蚓体内重金属含量显著提高; 蚯蚓和混合物的重金属组分含量能够满足相关的国家标准, 可以再利用.%Earthworm ( Eisenia fetida) was cultured in excess activated sludge from municipal sewage treatment plant of Guilin.Biomass change of earthworm was investigated.Content of heavy metal in earthworm and mix-ture after test was studied.Enrichment characteristics of earthworm of cadmium, zinc, copper and lead in ex-cess activated sludge were studied.Reuse of earthworm products characteristics after treatment was analyzed . The results show that weight increase of earthworm is extremely obvious after adding sludge.Heavy metal con-tent in the earthworms was much lower than that in mixture.The correlation between earthworm and mixture is positive for cadmium, copper and lead, and is negative for zinc.The enrichment comparative order is Cd>Pb>Zn>Cu.Heavy metal content in earthworm increased obviously after sludge added.Heavy metal content in products measured can meet the relevant national standards.