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

通过证实生活垃圾填埋场中甲烷厌氧氧化与好氧氧化的共存,提出了甲烷自然减排的新途径.分别选取暴雨过后垃圾填埋表层30～60 cm的覆土、1.5 m以下的垃圾以及底层矿化垃圾做硫酸盐还原菌阳性反应实验,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...

New Way for Natural Mitigation of Methane in Domestic Waste Landfill Sites: Co-oxidation of Anaerobic and Aerobic Oxidation

A new way for natural mitigation of methane was put forward by authenticating co-oxidation of anaerobic and aerobic oxidation of methane in domestic waste landfill sites.The soil at 30-60 cm,the waste below 1.5 m from the surface,and the aged waste at the bottom,were selected for the experiments of sulfate-reducing bacteria positive reaction.The results showed that sulfate-reducing bacteria nearly existed in all landfill layers of waste landfill bodies,and aged waste at the bottom contained most,the surface soil contained least.Waste samples with 50%:50% of coarse and fine particle size proportion showed the best methane oxidation effect of aerobic and anaerobic oxidation,and anaerobic oxidation accounted for above 20%.Microbial activity in aged waste and its methane co-oxidation rate both reached the maximum value as moisture content was 25%.Anaerobic oxidation rate could reach more than 30% as moisture content was close to 70%.Supplement of exogenous methane could culture methane-oxidizing bacteria and shorten the time of aerobic oxidation to 50% at the most.However,both aerobic and anaerobic oxidation would be weakened as the amount of exogenous methane was beyond 2 mL.