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Testing Stability of Chlorophenols and Lindane (-Hch) in Different Leachates Originating From Anaerobic Municipal Waste Decomposition

Department of Soil Protection, ETH Zuerich, Institute of Terrestrial Ecology, Grabenstr. 3, CH-8952 Schlieren, Switzerland

Klaus Pecher

Department of Hydrology, The University of Bayreuth, P.O. Box 101251, D-8580 Bayreuth, Germany

The degradation potential of landfill leachates for several chlorinated phenols and a pesticide (lindane) was investigated. Acidogenic and methanogenic model leachates from a laboratory waste lysimeter, as well as methanogenic leachate from a disposal site, were examined. In the assays with acidogenic leachates only lindane was metabolized completely within 60 days. In the methanogenic leachates, lindane and chlorophenols were metabolized immediately. No lindane metabolites could be detected. Detected chlorophenol metabolites pointed at reductive dehalogenation as the dominant degradation process, whereby ortho-dechlorination was strictly preferred. Transformation reactions were confined to samples which were biologically active.

Key Words: Chlorophenols • lindane • anaerobic degradation • municipal waste • reductive dehalogenation • xenobiotics • acid fermentation • methanogenesis • sequential waste stabilization.

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