孝感市污水处理厂污泥重金属含量及形态研究

摘要

Selected Xiaogan sewage treatment plant sludge as the research object, the amount of Zn, Cu, Cr, Cd, Pb in the sludge and its content of each form were determined, and various forms were analyzed. The results showed that the amount of 5 kinds of heavy metals in sewage sludge of the Xiaogan city sewage treatment plant was Cr>Zn>Cu>Pb>Cd. its content of each heavy metals was lower than alkaline of sludge in Standard of Pollutant Control in Agricultural Sludge (GB4284-84), so the sludge was suitable for pH>6. 5 soil as agricultural disposal. Zn, Cu, Cr, Cd and Pb in the sludge mainly existed in form of residue and organic combination, which was not easy to release to the environment.%选取孝感市污水处理厂的污泥为研究对象，测定了污泥中重金属Zn、 Cu、 Cr、 Cd、 Pb的总量及其各形态的含量，并对各形态进行分析。结果表明，孝感市污水处理厂的城市污泥中5种重金属元素的含量大小依次为Cr>Zn>Cu>Pb>Cd。均低于《农用污泥中污染物控制标准》( GB4284-84)中污泥农用的碱性标准，所以该污泥适合用于pH>6.5的土壤作为农用处置。 Zn、Cu、 Cr、 Cd、 Pb在该污泥中主要以残渣态和有机结合态存在，不易释放到环境中。