摘要
通过实验室土柱模拟方法,研究了不同场龄渗滤液中有机污染物、氮以及Fe、Mn、Zn、Cd在包气带中的迁移转化规律。结果表明,不同场龄渗滤液理化性质差别很大,随着场龄的增加,COD从40 194 mg/L降低到1 778 mg/L,NH4+浓度从1 758 mg/L升高到2 166 mg/L,金属浓度则减小。经过以细砂为介质的包气带后,新渗滤液易对地下水造成高浓度有机物污染,而老渗滤液更容易造成地下水的高浓度氮污染。Fe、Mn和Cd在包气带中比较稳定,而Zn的迁移能力很强,易对地下水构成威胁。
The transport and transformation of organic contaminants,nitrogen,Fe, Mn,Zn and Cd in vadose zone polluted by acetigenic and methanogenic lanfill leachate were studied in laboratory columns. Experimental results demonstrated that the physical and chemical characteristics of landfill leachate can exhibit considerably temporal variations. COD was reduced from 40 194 mg/L to 1 778 mg/L, NH4＋ was enhanced from 1 758 mg/L to 2 166 mg/L, concentration of metals decreased as the landfill age increasing. After flowing through the vadose zone, the organic matter content in the young leachate was so high that it had the inclination to pollute the groundwater, and so was the high concentration of nitrogen in the old leachate. Most of the Fe, Mn and Cd were reserved in the vadose zone, but Zn was flowed out easily and would threaten the quality of groundwater.
出处
《环境工程学报》
CAS
CSCD
北大核心
2008年第9期1189-1193,共5页
Chinese Journal of Environmental Engineering
基金
国家“973”重点基础研究发展规划项目(2004CB418505)
国家自然科学基金资助项目(50478009)
关键词
渗滤液
场龄
包气带
有机物
金属
氮
landfill leachate
landfill age
vadose zone
organic materials
metals
nitrogen
