Stabilization Process Analysis of Landfill Units Based on the Carbon Life Cycle and the Sustainable Landfill Model

摘要

The physicochemical features and biochemical methane potential production of exploited waste were used to evaluate the stabilization process of municipal solid waste (MSW) in a closed unit of Xiaping Landfill, Shenzhen, China. The samples of MSW aged 3-7 landfill years were collected. The MSW aged 3-4 years was initially stable, and the MSW aged 6-7 years was well stabilized. The gas generation of the landfill was characterized by a rapid production peak and a short production cycle, which were related to the high rapidly degradable component (RDC) content and relatively low moderately degradable and slowly degradable component contents (MDC and SDC). Modified multiphase methane production (MMPM) and multiphase methane production rate models (MMPRM) were developed to evaluate the stabilization status of the landfill in the hot and humid region of southern China. Moreover, the carbon balance analysis indicated that the biodegradable organic carbon content and gas production of MSW in China were higher than those in the United States and Europe, whereas the residual carbon of final storage quality (FSQ) was lower. The primary MSW stabilization process was characterized by biogas production from the decomposition of RDCs.