渗滤液回灌频率对生物反应器填埋场的影响研究

通过模拟实验研究了渗滤液回灌周期为1、2、3和5 d的4个模拟垃圾柱的产甲烷过程和渗滤液水质的变化情况.在用NaOH调节回灌渗滤液pH值的前提下,回灌频率越高,模拟厌氧型生物反应器填埋垃圾柱先开始产甲烷,但当回灌周期低于3 d时,开始产甲烷的时间相差不多.从渗滤液水质看,回灌周期为3 d的垃圾柱渗滤液COD、VFA等有机污染物浓度下降最快.综合考虑启动时间、运行费用和填埋场的稳定进程,在厌氧型生物反应器填埋场中,实施3 d/次的渗滤液回灌频率最为合适.

Effect of leachate recirculation frequency on the stabilization of anaerobic bioreactor landfill

The methanogenesis process and the changes of leachate of 4 simulated landfill columns with a leachate recirculation period of 1, 2, 3 and 5 days respectively have been studied through simulated experiment. Under the condition of adjusting the pH value of recirculated leachate with NaOH, the simulated anaerobic bioreactor landfill with higher leachate recirculation frequency began to produce methane earlier. But the difference between the time to produce methane was smaller while the recirculation period was under 3 days. It was shown that decline rate of COD, VFA concentration of leachate was fastest when the recirculation period is 3 days. Considering the time to begin to produce methane, the running cost in the start-up period and the stabilization rate in the methanogensis phase, the best period to recirculate leachate is 3 days in an anaerobic bioreactor landfill.