垃圾填埋初期渗滤液循环对其产生量的影响

Influence of Recirculation Operations to the Output of Leachate in Initial Landfill Stage

探讨了不同循环方式下垃圾填埋初期渗滤液产生量的规律,通过填埋模拟柱(填埋垃圾170kg)进行模拟雨水渗入、渗滤液原液循环和渗滤液经过好氧生物处理后循环至垃圾层的实验.结果表明,渗滤液循环能增加填埋层起始渗滤液的产生速率;填埋层初期净产液量不但取决于循环液量,还和循环水质密切相关;渗滤液原液循环4周后抑制微生物水解作用,从而减少了垃圾净产渗滤液量;渗滤液经过好氧生物处理后循环,能加速垃圾中易降解物质水解过程,即加快渗滤液产出,此后加速水解垃圾中的难降解物质,即能增加累积净产液量;Gompertz模型可模拟不同循环方式下填埋层累积渗滤液净产生量随时间变化的规律.

Experiments were conducted through simulation columns (with 170 kg of waste) to simulate the infiltration of rain, direct recirculation of the leachate without any pretreatment, recirculation of the leachate pretreated by aerobic biodegradation. The results indicate that (1) the output rate of leachate in the initial landfill stage can be enhanced through recirculation of leachate. (2) The net output of leachate in the initial landfill stage is depended on volumes and the quality of recycled leachate. (3) Microbial hydrolyzation is restrained and the net output of leachate is reduced by direct recirculation of the leachate without any pretreatment after four weeks. (4) Through recirculation of the leachate pretreated by aerobic biodegradation, it helps to improve microbial hydrolyzation, which can accelerate the output of leachate, and hereafter improve the hydrolyzation of non-degradable substance, namely to increase the cumulate volume of the net output of leachate. (5) Gompertz model can be used to simulate the rule of cumulate volume of the net output of leachate with time in the landfill layer by different recirculation operations.