Evaluation of the effects of chemically enhanced primary treatment on landfill leachate and sewage co-treatment in publicly owned treatment works
Evaluation of the effects of chemically enhanced primary treatment on landfill leachate and sewage co-treatment in publicly owned treatment works
复制标题
公营处理厂化学强化一级处理垃圾渗滤液及污水协同处理效果评价
DOI：
10.1016/j.jwpe.2021.102116
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发表时间：
2021
影响因子：
7
通讯作者：
Zhao, Renzun
中科院分区：
文献类型：
--
作者：
Patel, Harsh V.;Brazil, Brian;Lou, Helen H.;Jha, Manoj K.;Luster-Teasley, Stephanie;Zhao, Renzun
本研究评估了化学强化一级处理（CEPT）对公共处理厂（POTW）垃圾渗滤液和污水协同处理的效果。研究了 CEPT 中最常用的两种混凝剂：氯化铁和硫酸铝。在处理过程中对大量有机物、pH 变化、紫外线吸收等进行了评估。铁和铝混凝剂可去除 54%–74% 的有机物。在大多数情况下，铁混凝剂被发现比铝混凝剂去除有机物的效果更好。值得注意的是，氯化铁混凝使处理过的渗滤液的紫外线吸收率显着增加了 10 倍，而硫酸铝仅略微降低了紫外线吸收率。讨论了理论模型，以阐明各种 pH 情况下的共沉淀行为。由铁和有机物形成的复合物会加剧这种情况，这些复合物在紫外线范围内具有特征光吸收。傅里叶变换红外 (FTIR) 光谱支持此类复合物的形成。此外，渗滤液中的挥发性酸通过其缓冲能力在调节 pH 值方面发挥着重要作用。
This study evaluated the effects of Chemically Enhanced Primary Treatment (CEPT) on co-treatment of landfill leachate and sewage in publicly owned treatment works (POTWs). Two most frequently used coagulants in CEPT, ferric chloride and aluminum sulphate, were studied. Bulk organic matter, pH variation, UV absorption, etc. were evaluated during the treatment processes. 54 %–74 % organic matter removal was achieved by ferric and aluminum coagulants. Ferric coagulant was found to perform better for organic matter removal than aluminum in most cases. Notably, ferric chloride coagulation increased the UV absorbance of treated leachate significantly by up to 10 times, while aluminum sulphate only slightly decreased it. Theoretical models are discussed to elucidate co-precipitation behaviors under various pH scenarios. It is exacerbated by the complexes formed by ferric and organic matter, which have characteristic light absorption in the UV range. The formation of such complexes is supported by the Fourier Transform Infra-Red (FTIR) spectroscopy. In addition, the volatile acids in leachate were found to play an important role in mediating pH through their buffering capacity.