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.
Highlights
Landfilling is still a widely employed method for municipal waste treatment [1]
Landfill leachate is a sort of organic refractory effluent with complex pollutant constituents and high concentrations of poisons [4,5], including high contents of organic matter, inorganic substances, and xenobiotics consisting of aromatics, phthalates, phenols, pesticides, and other pollutants [6,7]
In order to minimize the toxicity of landfill leachate, several treatment methods have been applied to landfill leachate, including advanced oxidation technology, air stripping methods, adsorption methods, membrane treatment methods, etc
Summary
Landfilling is still a widely employed method for municipal waste treatment [1]. Leachate is generated from landfill, which is caused by the percolation of rainwater and moisture mixed with the degradation of solid waste [3]. Landfill leachate is a sort of organic refractory effluent with complex pollutant constituents and high concentrations of poisons [4,5], including high contents of organic matter (biodegradable and biorefractory), inorganic substances (metals, NH4 + -N, and chlorides), and xenobiotics consisting of aromatics, phthalates, phenols, pesticides, and other pollutants [6,7]. Advanced oxidation processes have proven to be an efficient method to degrade refractory organic pollutants, including ozone oxidation, photocatalytic
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