铬（Ⅵ）在粘土衬层中迁移转化的研究

A Study on the Fate and Transport of Cr(Ⅵ)in Compacted Clayliner

对有毒有害物质在粘土衬层中的自然渗透、迁移及转化加以研究，可为有毒有害废物的安全填埋场的设计、施工和污染预测提供实验依据及关键参数：铬（Ⅵ）是填埋场渗滤液中有代表性的重金属，通过铬（Ⅵ）在击实粘土中的渗透实验与浸提实验，发现铬（Ⅵ）的渗透系数约为水的４倍；铬（Ⅵ）可被粘土中还原性物质转化为毒性较小的铬（Ⅲ）：粘土击实到最大干密度可大大提高其防渗效果。

A knowledge about the infiltration, transport and fate of the hazardous,toxic substance in clayliner is very important to the design,construction and performance of hazardouswaste disposal facilities. Research on the permeability and adsorption of Cr,a typical metal inleachate from industrial waste landfill,by clay particle indicates that its permeahility coefficient ishigher than water due to the reduction in electrical double-layer,and Cr(Ⅵ)can be convertedgradually to less toxic Cr(Ⅲ).Clayliner compacted to the maximum dry density may avoid leak-age effectively.