生活垃圾填埋场甲烷自然减排的新途径:厌氧与好氧的共氧化作用

采用暴雨过后垃圾填埋表层30～60 cm的覆土、表层1.5 m以下的垃圾,以及刚刚开挖出来的9年矿化垃圾进行硫酸盐还原菌阳性反应试验,结果表明生活垃圾填埋体不同填埋层都存在不同数量级的硫酸盐还原菌,且底层矿化垃圾中的硫酸盐还原菌的数量最多,表层覆土中最少.颗粒大小比例为50%:50%的垃圾样品表现出最佳的甲烷好氧与厌氧...

A new way of natural mitigation of methane in a refuse landfill:Anaerobic and aerobic co-oxidation

The surface soil and refuse at 30~60 cm and 1.5 m of depth, respectively, and the aged refuse at the bottom of the refuse landfill, were selected for the experiments of Sulfate-reducing Bacteria(SRB) positive reaction. It was found that SRB nearly existed in all layers of solid waste landfill bodies, and aged refuse at the bottom contained most, the surface soil least of SRB. Garbage samples with 50%: 50% of coarse and fine particle size proportion showed the best of aerobic and anaerobic methane oxidation effect, and anaerobic oxidation accounted for above 20%.Microbial activity in aged refuse and co-oxidation rate of methane reached the maximum value with 25% of moisture content. Anaerobic oxidation rate could reach more than 30% as the moisture content was close to 70%. Supplement of exogenous methane could shorten the time of aerobic oxidation to 50%. However, both aerobic and anaerobic oxidation would be weakened as the amount of exogenous methane was beyond 2 mL. Therefore, a new way for natural mitigation of methane in refuse landfill was put forward based on the co-oxidation of anaerobic and aerobic oxidation of methane.