Department of Civil & Environmental Engineering, University of Shiraz, Shiraz 7134851156, Iran.
Waste Manag. 2010 Jun;30(6):1025-31. doi: 10.1016/j.wasman.2010.01.021. Epub 2010 Mar 2.
The main objective of this study was to assess the feasibility of treating sanitary landfill leachate using a combined anaerobic and activated sludge system. A high-strength leachate from Shiraz municipal landfill site was treated using this system. A two-stage laboratory-scale anaerobic digester under mesophilic conditions and an activated sludge unit were used. Landfill leachate composition and characteristics varied considerably during 8 months experiment (COD concentrations of 48,552-62,150 mg/L). It was found that the system could reduce the COD of the leachate by 94% at a loading rate of 2.25g COD/L/d and 93% at loading rate of 3.37g COD/L/d. The anaerobic digester treatment was quite effective in removing Fe, Cu, Mn, and Ni. However, in the case of Zn, removal efficiency was about 50%. For the rest of the HMs the removal efficiencies were in the range 88.8-99.9%. Ammonia reduction did not occur in anaerobic digesters. Anaerobic reactors increased alkalinity about 3.2-4.8% in the 1st digester and 1.8-7.9% in the 2nd digester. In activated sludge unit, alkalinity and ammonia removal efficiency were 49-60% and 48.6-64.7%, respectively. Methane production rate was in the range of 0.02-0.04, 0.04-0.07, and 0.02-0.04 L/g COD(rem) for the 1st digester, the 2nd digester, and combination of both digesters, respectively; the methane content of the biogas varied between 60% and 63%.
本研究的主要目的是评估采用厌氧-活性污泥组合系统处理卫生填埋场渗滤液的可行性。使用该系统处理来自设拉子市垃圾填埋场的高强度渗滤液。使用中温条件下的两级实验室规模厌氧消化池和活性污泥单元。在 8 个月的实验期间（COD 浓度为 48552-62150mg/L），垃圾渗滤液的组成和特性变化很大。结果表明，该系统在 2.25g COD/L/d 和 3.37g COD/L/d 的负荷率下，可将渗滤液的 COD 降低 94%和 93%。厌氧消化池处理对去除 Fe、Cu、Mn 和 Ni 非常有效。然而，对于 Zn，去除效率约为 50%。对于其余的重金属，去除效率在 88.8-99.9%之间。在厌氧消化池中没有发生氨还原。厌氧反应器使第一消化池的碱度增加了 3.2-4.8%，使第二消化池的碱度增加了 1.8-7.9%。在活性污泥单元中，碱度和氨的去除效率分别为 49-60%和 48.6-64.7%。第一消化池、第二消化池和两个消化池组合的甲烷产率分别为 0.02-0.04、0.04-0.07 和 0.02-0.04L/g COD（去除）；沼气中的甲烷含量在 60%-63%之间变化。
