Abstract: Aiming at the leachate treatment challenges caused by the mixing of rainwater and sewage in landfills under different operating conditions, this study was guided by the pollution control throughout the whole life cycle of landfills. Three typical municipal solid waste landfills in Ganzhou, Hefei and Shenzhen in southern China were selected, and the key technologies for rainwater-sewage separation in landfills were systematically analyzed around three typical engineering scenarios, such as newly-built landfill areas, closure treatment, and waste excavation & restoration. By standardizing the calculation of rainwater and leachate flow rates, scenario-specific technical schemes were proposed: the collaborative control technology of “horizontal zoning + vertical zoning + three-dimensional anti-seepage” was adopted for newly-built landfill areas， the comprehensive treatment measures of “stockpile reshaping + full-area drainage + three-dimensional anti-seepage”were implemented for closed landfill areas， and the combined measures of “zoned excavation + dynamic membrane coverage +vertical barrier” were applied for excavated landfill areas. The results showed that the constructed scenario-specific technical system could significantly reduce the leachate generation from the source, lower the subsequent leachate treatment load and operational costs, and effectively prevent and control the pollution risks to soil and groundwater. The research results can provide practical technical basis and engineering reference for the pollution prevention and control throughout the whole life cycle of municipal solid waste landfills.

Key words: waste landfill, rainwater and sewage diversion, new construction project of reservoir area, landfill closure project, landfill waste excavation project