污泥对区域生态环境的影响

对上海某乡因施用大量污泥而造成的污染状况作跟踪调查研究和质量评价。研究对象为土壤、水稻和蔬菜，被研究的污染元素为Ｃｄ、Ｚｎ、Ｃｕ、Ｐｈ、Ｎｉ、Ｃｒ、Ｈｇ和Ａｓ．结果表明，该乡土壤为复合污染，Ｃｄ、Ｚｎ、Ｃｕ是主要污染元素．污泥施用越多的地区，水稻、蔬菜受污染就越严重，尤以Ｃｄ污染最为突出，超过了允许卫生标准。确定了污染村、污染程度和污染面积。

EFFECT OF SEWAGE SLUDGE ON REGIONAL ECOENVIRONMENT

Tracking investigation and quality evaluation on the pollution resultingfrom the application of the large amounts of sewage sludge were carried out at a countryin Shanghai. The research objects are soil, rice and vegetable. The pollution elementsbeing studied are Cd, Zn,Cu,Pb, Ni,Cr,Hg, and As. The results show that the soil atthe country is pollLlted complexly, and Cd, Zn and Cu are the main polluters. The morethe sewage sludge is applied in the areas, the more the rice and vegetable are polluted.Among the elements, Cd pollution is the most serious, in excess of the national hygienicstandard. The polluted villages of the country) the pollution degrees and the pollutionareas are also determined in this paper.