Abstract
The use of "sanitary landfills" for the disposal of municipal solid wastes is quite prevalent in the United States and accounts for over 50% of the mechanisms currently used for urban refuse disposal. The decomposition processes which occur are primarily biological in nature and are the result of anaerobic and aerobic microorganisms. This biological action is responsible for most of the gases that are produced in the landfill. However, in addition to the biological activities, the contributions to quasi-decomposition from chemical engineering-chemistry processes should be considered. These processes involve a liquid medium, water, which is present at the landfill in the form of ground water or rainfall. Water contributes to the quasi-decomposition of the landfill contents by leaching, solubility, reactions, etc. These operations contribute to environmental degradation by soil contamination and possible water supply pollution.
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