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Understanding the effects of environmental conditions (e.g. temperature and pH value) on organic carbon dissolution behavior is very important for quantifying the biodegradation of municipal solid waste. However, the dissolving of organic carbon from solid waste has not been sufficiently described. In this paper, the dynamic of organic carbon dissolution under different temperature and pH value conditions are analyzed by both experiment data and model simulation. The results revealed that lower leaching pH values are favor for dissolving organic carbon especially rapidly dissolution fraction of the solid samples. Under high temperature extraction condition, the dissolution rate of rapidly dissolution fraction was also improved and the amounts of biodegradable products exceed low temperature extraction amount. The dissolving rates of organic carbon were in the order of 0.045-0.22 m/kg/h for all leaching conditions. The labile fractions of water extractable organic carbon were ranged from 3.5% to 20.3%. Therefore, the water extractable organic carbon extracted from MSW consists of substantial amount of stable fraction, indicating that anaerobic bioremediation of old landfill site is ineffective.

DISSOLUTION AND BIODEGRADATION KINETICS OF WATER EXTRACTABLE ORGANIC CARBON FROM MUNICIPAL SOLID WASTE UNDER VARIOUS CONDITIONS