渗滤液回流对不同填埋结构甲烷变化规律的影响研究

Effect of leachate recirculation on methane concentration changing in different landfilling structure of municipal solid waste

建立了大型模拟填埋试验装置,研究了渗滤液回流对不同填埋结构甲烷变化规律的影响。每周对填埋气体中甲烷浓度进行监测。结果表明厌氧填埋中回流操作使甲烷浓度峰值提前了147d,峰值为59.6%(体积分数,下同);准好氧填埋中回流操作使甲烷浓度峰值提前259d,峰值为44.7%。回流操作使甲烷产气高峰提前,增加产气量,加快填埋垃圾稳定,减轻渗滤液污染。厌氧填埋中进行回流操作有利于甲烷的回收利用;准好氧填埋结构可有效减少甲烷的排放,减小对环境的危害。稳定期的垃圾填埋体进行回流产生一定的甲烷,但浓度较低,最高仅26.0%,没有利用价值。

In order to study the effect of leachate recirculation on methane concentration changing in different landfilling structure of municipal solid waste, the large scale landfilling installations were built by semi-aerobic landfilling and anaerobic landfilling theories. The methane concentration was regularly monitored per week. The results showed that, leachate recirculation used in anaerobic landfilling made the peak concentration of methane output bring forward, lessening 147 days than non recirculation, the peak concentration was 59.6%. And leachate recirculation used in semi-aerobic landfilling made the peak concentration of methane output bring forward, lessening 259 days than non-recirculation, the peak concentration was 44.7 %. So it could be concluded that leachate recirculation accelerated the stabilization of landfill, reduced environmental pollution as well as. The aerobic landfill is advantageous to methane recycling. The semi-aerobic landfill reduces the amount of methane.