DURATION OF LEACHING METALS FROM THE LANDFILL BODY AT MUNICIPAL SOLID WASTE DISPOSAL SITES 

I. V. Galitskaya^1,*, V. S. Putilina^1,**, and T. I. Yuganova^1,***

¹ Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences, Ulanskii per., 13, str. 2, Moscow, 101000 Russia
*E-mail: galgeoenv@mail.ru
**E-mail: vputilina@yandex.ru
***E-mail: tigryu@gmail.com

Based on the analysis of Russian and foreign publications, we have studied the following aspects of municipal solid waste disposal: the duration of leaching metals from a landfill body, the mobility of metals under aerobic and anaerobic conditions, and the forms of their binding in the solid phase. The rate of leaching metals decreases exponentially with time starting from the early stages of degradation to the stage of methane formation. Numerous studies have shown that less than 1% of heavy metals is leached from landfills during 30 years of waste storage. As a rule, metals are leached at the early stages of landfill life, and subsequently their mobility is significantly reduced as a result of sorption processes. Changes in conditions at the stage of stable methanogenesis can lead to a significant increase in the mobility of heavy metals in a landfill. Situations are analyzed where, after the closure of a landfill, oxygen may be released with atmospheric precipitation, changes in anaerobic conditions to aerobic and an increase in the mobility of bound metals are possible. It is noted that, due to the significant buffering capacity of the waste, an increase in the influx of metals into the filtrate will not occur for a long time.

Key words: municipal solid waste landfill, leaching, heavy metals, groundwater contamination, landfill stability 

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