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Int. J. Environ. Res. Public Health 2016, 13(12), 1262; doi:10.3390/ijerph13121262

Evaluation of the Treatment Process of Landfill Leachate Using the Toxicity Assessment Method

1
School of Environmental and Safety Engineering, Changzhou University, No. 1 GeHu Road, Wujin District, Changzhou 213164, Jiangsu, China
2
Yangtze Delta Region Institute of Tsinghua University, No. 705, Yatai Road, Nanhu District, Jiaxing 314006, Zhejiang, China
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 31 October 2016 / Revised: 13 December 2016 / Accepted: 14 December 2016 / Published: 21 December 2016
(This article belongs to the Section Environmental Health)
View Full-Text   |   Download PDF [1924 KB, uploaded 21 December 2016]   |  

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 with Vibrio 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 for Vibrio 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. View Full-Text
Keywords: landfill leachate; electrolytic biological filter; Vibrio fischeri; zebrafish larvae; zebrafish embryos; toxicity reduction landfill leachate; electrolytic biological filter; Vibrio fischeri; zebrafish larvae; zebrafish embryos; toxicity reduction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Qiu, A.; Cai, Q.; Zhao, Y.; Guo, Y.; Zhao, L. Evaluation of the Treatment Process of Landfill Leachate Using the Toxicity Assessment Method. Int. J. Environ. Res. Public Health 2016, 13, 1262.

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