摘要
We investigated migration of pollutant at the base of the Suzhou landfill after it had been operated for 13 years. The investigation was carried out by performing chemical analyses on the soil samples taken from the silty clay deposit. Concentrations of chloride, chemical oxygen demand （COD） and the heavy metals in the soil samples were determined using the standard methods. The experimental data showed that the maximum migration depth of chloride was more than 10 m, while the maximum migration depth of COD varied between 1 and 3.5 m. It is believed that the difference is attributed to the variation in diffusion rate and leachate-soil interaction. The chloride profiles also indicated that adveetion may be the dominant contaminant transport mechanism at this site. The total contents ofCu, Pb and Cr are very close to the background levels and the concentration values of these metals mainly are lower than the threshold values specified by the Chinese soil quality standard and the European one. The water-extractable concentrations of COD in the surface of the silty clay generally exceed the limit value specified by the Chinese standard. The concentrations of copper and chromium in pore water are 1-2 orders of magnitude less than the total concentrations of these heavy metals within the soils, implying that heavy metals are mainly adsorbed by the soil particles. Finally, remediation methods were suggested for this landfill site.
在它被操作 13 年了以后，我们在苏州垃圾堆的底调查了污染物质的移植。调查被在从淤泥的泥土存款拿的土壤样品上执行化学分析执行。氯化物，化学需氧量(货到付款) 和在土壤样品的重金属的集中用标准方法被决定。实验数据证明氯化物的最大的迁居深度是超过 10 m，当货到付款的最大的迁居深度在 1 和 3.5 m 之间变化了时。差别处于散开率和 leachate 土壤相互作用被归因于变化，这被相信。氯化物侧面也显示移流可以是在这个地点的主导的沾染物运输机制。Cu， Pb 和 Cr 的全部的内容主要离背景层次和这些金属的集中价值很靠近比中国土壤质量标准和欧洲标准指定的起点值低。在淤泥的泥土的表面的货到付款的水可引出的集中通常超过中国标准指定的极限值。毛孔水里的铜和铬的集中是 1 个 ∼2 数量级不到在土壤以内的这些重金属的全部的集中，暗示重金属是主要由土壤粒子吸附了。最后，补习方法为这个垃圾堆地点被建议。
基金
supported by the National Natural Science Foundation of China (No. 50538080)
the National Science Fund for Distinguished Young Scholars (No. 50425825), China
