Department of Civil Engineering, University of Peradeniya, Peradeniya, 20400, Sri Lanka; School of Engineering and Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, VIC, 3000, Australia.
Department of Civil Engineering, University of Peradeniya, Peradeniya, 20400, Sri Lanka.
Chemosphere. 2022 Nov;307(Pt 3):136013. doi: 10.1016/j.chemosphere.2022.136013. Epub 2022 Aug 13.
This study describes the collection of landfill leachate from seven sites in different climatic zones of Sri Lanka and characterizes the landfills through the analyses of leachate quality. Membrane bioreactors (MBRs) with different configurations were employed to treat some of those leachates. An aerobic MBR (AMBR) system was operated in three Phases. In the first Phase, an AMBR alone, in the second Phase an anaerobic reactor followed by an anoxic reactor and an AMBR and in the third Phase an anoxic reactor followed by an AMBR were operated. In Phases I and II, the sludge retention time (SRT) and the hydraulic retention time (HRT) were kept at infinite (as no intentional wasting of sludge was made) and 96 h; in Phase III, the SRT was varied from 60, 30, 20 to 10 days and under each SRT, the HRT was varied from 96, 48, 24 and 12 h. The optimum operating conditions for the configuration used in Phase III was established through extensive experiments which had a SRT. The three MBR configurations removed more than 93%, 64.8% and 59% of BOD, COD and total nitrogen respectively. They also removed large amounts of slowly biodegradable substances and nitrogenous compounds other than NH, NO and NO. Relationships between SRT and MLSS as well as SRT and fouling rate of membrane have been found. The study illustrates the capabilities of MBR in treating landfill leachate.
本研究描述了从斯里兰卡七个不同气候区的垃圾填埋场采集的渗滤液，并通过对渗滤液质量的分析来对垃圾填埋场进行特征描述。采用不同配置的膜生物反应器（MBR）来处理其中一些渗滤液。一个好氧 MBR（AMBR）系统分三个阶段运行。在第一阶段，单独运行一个 AMBR；在第二阶段，一个厌氧反应器后面接着一个缺氧反应器和一个 AMBR；在第三阶段，一个缺氧反应器后面接着一个 AMBR。在第一阶段和第二阶段，污泥停留时间（SRT）和水力停留时间（HRT）保持无限（因为没有故意排泥）和 96 小时；在第三阶段，SRT 分别从 60、30、20 到 10 天变化，在每个 SRT 下，HRT 从 96、48、24 和 12 小时变化。通过广泛的实验确定了第三阶段所用配置的最佳运行条件，该条件下的 SRT。三种 MBR 配置分别去除了超过 93%、64.8%和 59%的 BOD、COD 和总氮。它们还去除了大量的难生物降解物质和除 NH、NO 和 NO 以外的含氮化合物。发现了 SRT 与 MLSS 之间以及 SRT 与膜污染速率之间的关系。该研究说明了 MBR 处理垃圾渗滤液的能力。
