The article presents the results of the analysis of chemical composition of drainage water from the landfill of the municipal solid waste (MSW) and simulation reactor for waste decomposition forecasting. The analysis of cationic and anionic water drainage under accelerated MSW fracture simulation has shown that in the initial period in the drainage water disposal mainly carbonates, chlorides, fluorides pass, and then sulfates and nitrates. After covering the polygon anaerobically chlorides

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... tes and carbonates share increases, while carbonates precipitate as insoluble salts, phosphates and other salts are formed. Anionic composition of drainage water MSW quite large and contains extractable anions other than those listed in the bioreactor, and even bromides. High carbonate content indicates dissolution of carbon dioxide from the atmosphere and formation of carbonate salts. And heavy elements, especially strontium, remain as insoluble salts in the sediments.