Landfill leachate , generation , composition , and some findings from leachate treatment at Swedish plants

VA N N 2 2 0 0 7 Abstract The aim of the paper is to present some fundamental conditions for the landfill leachate generation, and discuss possible variations due to the composition of the deposited refuse. Consideration is given to changes in the refuse, and its (future) influence on the leachate composition with respect to impurities. The major factors defining the composition are discussed as well as the change in time of the leachate. However, this paper is limited to what is defined as anaerobic phases inside the landfill. In an extended perspective a “second” long lasting aerobic phase is likely to occur. Some comments are given on the leachate composition as found at a number of Swedish landfills, typically contradicting a number of widespread “convictions”.