LEACHING OF POLLUTANTS OUT OF THE PRODUCTS OF MECHANICAL-BIOLOGICAL TREATMENT OF MUNICIPAL SOLID WASTE: LEACHATE COMPOSITION AND ADMISSIBILITY OF DISPOSAL AT MSW LANDFILLS

Yuganova T.I ¹

¹Sergeev Institute of Environmental Geoscience RAS (IEG RAS) Ulansky per. 13, bld. 2, Moscow, 101000

Parameters of leaching pollutants from the products of mechanical-biological treatment (MBT) of municipal solid waste (MSW) are considered. The evolution of the composition of filtrates during MBT has been studied. Treated waste with fresh and mature MSW was compared. This is important for assessing the risk of groundwater pollution from landfills receiving stabilized waste (SW). The admissibility of SW burial at MSW landfills was analyzed in accordance with the criteria adopted in some European countries. The relationship between leaching of dissolved organic carbon (DOC) and heavy metals (HMs) is considered, and a direct linear correlation is revealed for several HMs. The indicators of metal leaching were analyzed by the statistical method of principal components to reveal the relationship of parameters that determine potential emissions from SW. The analysis showed that Cu has affinity for mobile humic acids (HAs) or DOC, while Zn, Cr and Ni and, to a lesser extent, Cd, Pb and Cu have affinity for solid HAs. These differences in the interaction of immobile and mobile humic substances with HMs require further attention in order to develop individual schemes for monitoring MBT-waste and optimize treatment processes to achieve the desired quality of SW.

Key words: municipal solid waste, mechanical-biological treatment, stabilized waste, leaching, leachate composition, organic matter, heavy metals, burial admissibility

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