A Compilation of Current Readings: Leachate Recirculation

Publish Date: 1997

The principal objective of this study was to simulate leachate quantity and quality, as well as biogas generation at sanitary landfills under both management scenarios of single-pass leaching and leachate recirculation practices. This objective was satisfied by developing a numerical model, PITTLEACH-2(1), based on fundamental relationships among hydrologic, hydraulic, physical/chemical and biological processes of landfill leaching and stabilization. The principles of unsaturated flow and contaminant transport in porous media were utilized to predict leachate behavior and landfill stabilization in three general areas, including moisture distribution and flow, leachate organic strength, and overall methane production. The microbially-mediated processes of solid waste anaerobic decomposition were simulated in terms of hydrolytic conversion of solid organic constituents (hydrolysis), acid formation (acidogenesis), and methane fermentation (methanogenesis). The model predicts the hydrolysis product concentrations, total volatile acid concentrations, acidogenic and methanorganic populations, methane production rates, and leachate pH values.

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