Effect of leachate recirculation frequency on the stabilization of anaerobic bioreactor landfill
渗滤液回灌频率对生物反应器填埋场的影响研究

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.