渗滤液
地下水
环境科学
浸出(土壤学)
有机质
污染物
生物反応器型埋立
污染
环境化学
地下水污染
分解
异型生物质的
化学
环境工程
含水层
生态学
土壤科学
地质学
土壤水分
生物
有机化学
酶
岩土工程
生物化学
作者
Peter Kjeldsen,Morton A. Barlaz,Alix P. Rooker,Anders Baun,Anna Ledin,Thomas Højlund Christensen
标识
DOI:10.1080/10643380290813462
摘要
The major potential environmental impacts related to landfill leachate are pollution of groundwater and surface waters. Landfill leachate contains pollutants that can be categorized into four groups (dissolved organic matter, inorganic macrocomponents, heavy metals, and xenobiotic organic compounds). Existing data show high leachate concentrations of all components in the early acid phase due to strong decomposition and leaching. In the long methanogenic phase a more stable leachate, with lower concentrations and a low BOD/COD-ratio, is observed. Generally, very low concentrations of heavy metals are observed. In contrast, the concentration of ammonia does not decrease, and often constitutes a major long-term pollutant in leachate. A broad range of xenobiotic organic compounds is observed in landfill leachate. The long-term behavior of landfills with respect to changes in oxidation-reduction status is discussed based on theory and model simulations. It seems that the somewhere postulated enhanced release of accumulated heavy metals would not take place within the time frames of thousands of years. This is supported by a few laboratory investigations. The existing data and model evaluations indicate that the xenobiotic organic compounds in most cases do not constitute a major long-term problem. This may suggest that ammonia will be of most concern in the long run.
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