包气带介质截留不同龄垃圾渗滤液中的有机污染物

从渗滤液场龄和包气带岩性两方面着手,研究了不同岩性包气带介质对不同场龄渗滤液中有机污染物的截留作用规律。结果表明:新渗滤液经过以细砂、亚粘土为介质的包气带后,细砂和亚粘土中有机物的质量分数分别从0.70%和0.87%增大至0.80%和1.00%以上,而老渗滤液使细砂和亚粘土中有机物的质量分数降至0.70%和0.50%以下。新渗滤液经过包气带后,包气带介质中有机物的含量增大,而老渗滤液使包气带介质中有机物的含量降低,亚粘土较细砂更容易受到渗滤液污染的影响。即渗滤液性质对包气带介质中有机物含量具有方向性的影响作用,而包气带介质亚粘土比细砂更容易放大这种作用效果。

The Organic Materials of Different Age Landfill Leachate Retarded by Vadose Zone

The retardance of organic contaminants in acetigenic and methanogenic lanfill leachate by different vadose zone lithology was studied in laboratory columns.Experimental results demonstrated that the organic content of clay and fine sand in the vadose zones was increased from 0.70% and 0.87% to above 0.80% and 1.00% contaminated by young leachate and decreased to below 0.70% and 0.50% polluted by old leachate.In the vadose zone the organic matter content rose when contaminated by young leachate,however decreased when polluted by old leachate.Silt as the vadose material was more easily impacted by leachate than clay.It means that the property of landfill leachate influences the organic matter content in the vadose zone;furthermore silt would more likely exaggerate the effects more than clay.