Abstract: In order to make up for the lack of laboratory simulation research on in-situ aerobic remediation of existing landfill sites of more than 10 years age, the ability of aerobic ventilation to improve the biodegradability of existing domestic waste was investigated with refuse of 10 years landfill age in the actual landfill site by comparing the changes in main indicators of solid waste and leachate during the operation of aerobic and anaerobic bioreactors in the laboratory. The results demonstrated that the degradation of existing refuse followed a first-order kinetic reaction under anaerobic and aerobic ventilation conditions, the degradation rate of refuse and the decay rate of organic matter in leachate under aerobic ventilation conditions were significantly faster than that under anaerobic conditions. The attenuation coefficients of cellulose to lignin ratio, refuse degradation stabilization normalization index, biodegradable substance content, and refuse organic matter content under aerobic ventilation conditions were 6.0, 4.0~4.3, 3.0~4.0, and 1.7~1.8 times of those under anaerobic conditions, respectively; and as for the COD, BOD5, and B/C of leachate, the multiples were 8.0, 7.0 and 2.5, respectively.

Key words: stock domestic waste, aerobic ventilation, refuse biodegradation, leachate