Investigation of Aerobic Recirculation on Landfill Leachate from Municipal Solid Wastes (MSW)

As leachate in waste landfill may cause secondary pollution, which is one of the key problems for leachate derived from the waste landfill, therefore, the treatment of leachate is an essential part in waste landfill. To evaluate effects of aerobic condition on leachate, we established five columns filled with garbage in LiuLiTun landfill, Haidian District, Beijing. Column 1 was under the condition of anaerobic, column 2 to column 5 were all in aerobic. Approximately one hundred earthworms were added in column 4, and 5 Liters of original leachate were added in column 5. All the columns were re-circulated three times every week, and quantity and normal water index of leachates generated in all the treatments were tested. Chemical parameters that are used in the test included CODCr and ammonia-nitrogen and pH and so on.The results showed that comparison with anaerobic condition, in the aerobic condition, 1,67 percent less leachate generated; 2, there was a trend to form neutral environment; 3, the maximum temperature that system can reach were higher, and less time was needed to this. It may be concluded aerobic condition promote the degradation of leachate greatly. Furthermore, there were beneficial aspects to add earthworm and sludge in column, including declining of the CODCr and ammonia-nitrogen, reaching stable stage earlier and improving the stability course of landfill.