Chulalongkorn University, Bangkok, Thailand.
Water Sci Technol. 2012;66(8):1774-80. doi: 10.2166/wst.2012.324.
Two-stage membrane bioreactor (MBR) system was applied to the treatment of landfill leachate from a solid waste disposal site in Thailand. The first stage anoxic reactor was equipped with an inclined tube module for sludge separation. It was followed by an aerobic stage with a hollow fiber membrane module for solid liquid separation. Mixed liquor sludge from the aerobic reactor was re-circulated back to anoxic reactor in order to maintain constant mixed liquor suspended solids (MLSS) concentration in the aerobic reactor. The removal of micro-pollutants from landfill leachate along the treatment period of 300 days was monitored. The results indicated that two-stage MBRs could remove biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NH(4)(+) by 97, 87 and 91% at steady operating condition. Meanwhile organic micro-pollutant removals were 50-76%. The removal efficiencies varied according to the hydrophobic characteristic of compounds but they were improved during long-term MBR operation without sludge discharge.
两段式膜生物反应器（MBR）系统被应用于处理来自泰国某固体废物处理场的垃圾渗滤液。第一段缺氧反应器配备了斜管模块用于污泥分离。接下来是有氧阶段，使用中空纤维膜模块进行固液分离。为了保持有氧反应器内混合液悬浮固体（MLSS）浓度的稳定，从有氧反应器中回流混合液污泥到缺氧反应器。在 300 天的处理期间监测了微污染物从垃圾渗滤液中的去除情况。结果表明，两段式 MBR 可以在稳定运行条件下将生化需氧量（BOD）、化学需氧量（COD）和 NH4+分别去除 97%、87%和 91%。同时，有机微污染物的去除率为 50-76%。去除效率根据化合物的疏水性特征而变化，但在没有污泥排放的长期 MBR 运行过程中得到了提高。
