【摘要】 土地利用是国内外城市污泥处置的最重要手段。通过分析总结国内外大量的研究结果,显示城市污泥施入土壤后,重金属在土壤中有一定的迁移,但大部分都滞留在土壤表层。重金属进入土壤后会重新分布,使土壤中有效态重金属的含量有所增加。国内外研究的结果一致表明,城市污泥合理施用短期内不会对土壤造成污染。考虑到过去的污泥施用量非常大,并且过去城市污泥中的重金属含量远高于现在的,过去部分研究结果认为长期施用城市污泥可能带来土壤重金属污染风险的结论不符合中国的现实。目前,中国仍缺乏对城市污泥土地利用过程中重金属潜在风险的长期定位研究,今后需要加强此方面的研究工作。更多还原

【Abstract】 Land application is an important way for treatment of sewage sludge both in China and the world.Many domestic and foreign studies about the effect of sewage sludge land application on the soil were analyzed and summarized.The results showed that the heavy metals in the sewage sludge could migrate to soil after its land application.However,most of the heavy metals were accumulated in the topsoil.The heavy metals could be redistributed in the soil upon entry,which would result in an increase in the contents of available heavy metals.There was no pollution risk to soil if the sewage sludge was applied for a short period with a small quantity.The conclusion that sewage sludge land application for a long period could lead to heavy metals pollution to the soil did not accord with China’s case.The quantities of sewage sludge application and the concentrations of heavy metals in sewage sludge were notably higher abroad.In China,there is lack of study on the long-term effect of sewage sludge land application on the potential pollution risk of heavy metals.Study on this field should be strengthened urgently.更多还原