Solid Waste Management and Landfill Hydraulics: Leachate Generation Kinetics, Liner Permeability, and Gas Recovery Systems
Municipal Solid Waste (MSW) management involves the collection, segregation, biological stabilization, and ultimate engineered disposal of municipal refuse. Sanitary landfills represent the final containment facility designed to isolate non-recyclable solid waste from surrounding soil, surface water, and groundwater regimes. A critical hydraulic parameter in landfill design is the estimation of Leachate Generation Rates , which occur when percolating meteoric precipitation extracts dissolved organic and inorganic contaminants from decomposing waste layers. The water balance method evaluates potential leachate volume ($L_0$) as: $$L_0 = P - R - ET - \Delta S$$ Where $P$ is total precipitation, $R$ is surface runoff, $ET$ is evapotranspiration, and $\Delta S$ is the change in internal moisture storage capacity of the solid waste bed. Seepage velocity ($v_s$) through a compacted clay liner (CCL) under hydraulic head $h$ and liner thickness $d_c$ is evaluated using Darcy’s Law : ...