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Evolution on qualities of leachate and landfill gas in the semi-aerobic landfill

Journal of Environmental Sciences 2008年第4期20卷 499-504页

作者： HUANG Qifei YANG Yufei PANG Xiangrui WANG Qi Research Institute of Solid Waste Management Chinese Research Academy of Environmental Sciences Beijing 100012 China Civil and Environment Engineering School University of Science and Technology Beijing Beijing 100083 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150001 China

To study the characteristics of stabilization in semi-aerobic landfill, large-scale simulated landfill was constructed based on the semi- aerobic landfill theory. Consequently, the concentrations of chemical oxygen demand （COD）, ammonia nitrogen, and nitrite nitrogen, and the pH value in leachate, as well as the component contents of landfill gas composition （methane, carbon dioxide, and oxygen） in landfill were regularly monitored for 52 weeks. The restflts showed that COD and ammonia concentrations declined rapidly and did not show the accumulating rule like anaerobic landfill, and remained at about 300 and 100 mg/L, respectively, after 48 weeks. Meanwhile, the descending rate reached 98.9% and 96.9%, respectively. Nitrate concentration increased rapidly after 24 weeks and fluctuated between 220-280 mg/L after 43 weeks. The pH values were below 7 during the first 8 weeks and after that leachates appeared to be alkaline. Carbon dioxide was the main composition in landfill gas and its concentration remained at a high level through the whole stabilization process. The average contents of carbon dioxide, oxygen, and methane varied between 19 vol.%-28 vol.%, 2 vol.%-8 vol.%, and 5 vol.%-13 vol.%, respectively. A relative equilibrium was reached after 48 weeks. The highest temperature in the landfill chamber could amount to 75.8 degrees centigrade.

关键词： semi-aerobic landfill stabilization leachate landfill gas

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