title: Evaluation of the Treatment Process of Landfill Leachate Using the Toxicity Assessment Method.
abstract: Landfill leachate is composed of a complex composition with strong biological toxicity. The combined treatment process of coagulation and sedimentation, anaerobics, electrolysis, and aerobics was set up to treat landfill leachate. This paper explores the effect of different operational parameters of coagulation and sedimentation tanks and electrolytic cells, while investigating the combined process for the removal efficiency of physicochemical indices after processing the landfill leachate. Meanwhile, a battery of toxicity tests withVibrio fischeri, zebrafish larvae, and embryos were conducted to evaluate acute toxicity and calculated the toxicity reduction efficiency after each treatment process. The combined treatment process resulted in a 100% removal efficiency of Cu, Cd and Zn, and a 93.50% and an 87.44% removal efficiency of Ni and Cr, respectively. The overall removal efficiency of chemical oxygen demand (COD), ammonium nitrogen (NH₄⁺-N), and total nitrogen (TN) were 93.57%, 97.46% and 73.60%, respectively. In addition, toxicity test results showed that the acute toxicity of landfill leachate had also been reduced significantly: toxicity units (TU) decreased from 84.75 to 12.00 for zebrafish larvae, from 82.64 to 10.55 for zebrafish embryos, and from 3.41 to 0.63 forVibrio fischeri. The combined treatment process was proved to be an efficient treatment method to remove heavy metals, COD, NH₄⁺-N, and acute bio-toxicity of landfill leachate.
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, No. 1 GeHu Road, Wujin District, Changzhou 213164, Jiangsu, China. captainqiu1013@163.com.|Yangtze Delta Region Institute of Tsinghua University, No. 705, Yatai Road, Nanhu District, Jiaxing 314006, Zhejiang, China. captainqiu1013@163.com.
authors.forename: Aifeng
authors.initials: A
authors.lastname: Qiu
authors.affiliation: Yangtze Delta Region Institute of Tsinghua University, No. 705, Yatai Road, Nanhu District, Jiaxing 314006, Zhejiang, China. caiq@tsinghua.edu.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Cai
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, No. 1 GeHu Road, Wujin District, Changzhou 213164, Jiangsu, China. zhaoyuan12@tsinghua.org.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Environmental and Safety Engineering, Changzhou University, No. 1 GeHu Road, Wujin District, Changzhou 213164, Jiangsu, China. water8820@163.com.
authors.forename: Yingqing
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Yangtze Delta Region Institute of Tsinghua University, No. 705, Yatai Road, Nanhu District, Jiaxing 314006, Zhejiang, China. liqian_zhao@hotmail.com.
authors.forename: Liqian
authors.initials: L
authors.lastname: Zhao
mesh_terms: D048908:Aliivibrio fischeri / Q000302:isolation & purification; D057919:Biological Oxygen Demand Analysis; D019216:Metals, Heavy / Q000737:chemistry*; D009584:Nitrogen; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D009584:Nitrogen
keywords: Vibrio fischeri; electrolytic biological filter; landfill leachate; toxicity reduction; zebrafish embryos; zebrafish larvae