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标题：Effect of pretreatment by coagulation on stabilized landfill leachate during anaerobic treatment
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作者：Joginder Singh Yadav ; Anil Kumar Dikshit ; Carla Aparecida Ng 等
期刊名称：Cogent Environmental Science
电子版ISSN：2331-1843
出版年度：2016
卷号：2
期号：1
页码：1209993
DOI：10.1080/23311843.2016.1209993
语种：English
出版社：Taylor and Francis Ltd
摘要：Abstract Landfill leachate contains both larger fractions of higher molecular weight organic materials and heavy metals. The study investigated the effect of coagulation as pretreatment during anaerobic treatment process on stabilized landfill leachate. Anaerobic studies were done on the raw stabilized leachate and on the pretreated leachate, where coagulation was used as a pre-treatment process for leachate. Landfill leachate samples were collected from India’s largest and oldest landfill i.e. Deonar landfill, Mumbai. The leachate was characterized by high TS (10,910 mg/l), COD (2,300 mg/l), BOD (238 mg/l), TOC (716 mg/l) and low BOD/COD ratio (0.10). FeCl₃ and PACl were used as coagulants for the coagulation process. The highest removal efficiency obtained by FeCl₃ and PACl for COD was 53 and 59%, respectively. The highest removals of TOC were 52 and 57% by FeCl₃ and PACl, respectively. The optimum pH and dose for FeCl₃ was found to be 8 and 7 g/l, respectively. The best pH and dose for PACl was found to be 6 and 10 g/l, respectively. Anaerobic batch reactor treatment was applied as secondary treatment on pre-treated leachate and also on raw leachate. Anaerobic batch experiment was performed for batch time 72 h with solids retention time of 10 days. When anaerobic batch treatment was done on raw leachate, it showed constant 35% TOC and 38% COD removal after 40 h. In the case of anaerobic batch experiment after coagulation, the overall TOC and COD removal was found to be 70 and 72%, respectively.
关键词：anaerobic biological process ; coagulation ; chemical oxygen demand ; landfill leachate