Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, PR China.
School of Environmental Science and Engineering, Donghua University, Shanghai 200051, PR China.
Waste Manag. 2017 May;63:292-298. doi: 10.1016/j.wasman.2016.09.003. Epub 2016 Sep 12.
The aim of this study was to provide an alternative way to remove bio-refractory organics and ammonical-nitrogen from mature municipal solid waste (MSW) landfill leachate by combining biological and photochemical processes. To achieve this objective, the effectiveness of anoxic aged refuse-based bioreactor (ARB) for biological leachate pretreatment followed by Advanced Oxidation Processes (AOPs) by heterogeneous photocatalysis (TiO/UV) and persulfate (SO) oxidation were tested. The results obtained after ARB based pre-treatment demonstrated a mean 72%, 81% and 92% degradation of COD, NHN and TN, respectively. However, this treated leachate cannot be discharged without another treatment; hence, it was further treated by UV-mediated TiO photocatalysis and SO oxidation. An average 82% of COD was abated at optimum condition (1gL TiO; pH 5) whereas, using an optimum 1.5gL persulfate at pH 5, 81% COD reduction occurred. Acidic and alkaline pH favored COD and NHN removal respectively. The results of this study demonstrated that coupling ARB with AOPs is potentially applicable process to deal with bio-recalcitrant compounds present in mature landfill leachate.
本研究旨在提供一种替代方法，通过结合生物和光化学过程，从成熟的城市固体废物（MSW）垃圾渗滤液中去除生物难降解有机物和氨氮。为了实现这一目标，测试了缺氧老化垃圾基生物反应器（ARB）对生物渗滤液进行预处理，然后通过非均相光催化（TiO/UV）和过硫酸盐（SO）氧化进行高级氧化工艺（AOPs）。ARB 预处理后的结果表明，COD、NHN 和 TN 的平均降解率分别为 72%、81%和 92%。然而，未经进一步处理，这种处理后的渗滤液不能排放；因此，它进一步通过 UV 介导的 TiO 光催化和 SO 氧化进行处理。在最佳条件（1gL TiO；pH 5）下，COD 平均减少了 82%，而在 pH 5 下使用最佳的 1.5gL 过硫酸盐，则发生了 81%的 COD 减少。酸性和碱性 pH 分别有利于 COD 和 NHN 的去除。本研究结果表明，ARB 与 AOPs 相结合是处理成熟垃圾渗滤液中存在的生物难降解化合物的潜在适用工艺。
