Removal of humic substances from landfill leachate by Fenton oxidation and coagulation |
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| Authors: | Yanyu Wu Shaoqi Zhou Fanghui Qin Huaping Peng Yanglan Lai Yiming Lin |
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| Affiliation: | 1. College of Environmental Science and Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, 510006 Guangzhou, PR China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, 510641 Guangzhou, PR China;3. Key Laboratory of Environmental Protection and Eco-remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou Higher Education Mega Center, 510006 Guangzhou, PR China;1. Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India;2. CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, 440020, India;1. LIWET, Department of Industrial Biological Sciences, Ghent University, Campus Kortrijk, Graaf Karel de Goedelaan 5, B-8500 Kortrijk, Belgium;2. BIOMATH, Department of Mathematical Modeling, Statistics and Bioinformatics, Ghent University, Gent, Belgium;3. EnVOC, Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium;4. Kenya Industrial Research and Development Institute (KIRDI), P.O. Box 30650-00100, Nairobi, Kenya;1. LEQUiA, Institute of the Environment, University of Girona, C/Maria Aurelia Company, 69, Facultat de Ciencies, E-17003 Girona, Spain;2. Shanghai Key Laboratory for Urban Ecological Process and Eco-Restoration, School of Ecology & Environmental Science, East China Normal University, Shanghai 200241, China |
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| Abstract: | In this study, chemical oxygen demand (COD) was characterized as total organic constituents and the isolated humic substances (HS) were characterized as an individual organic contaminant in landfill leachate. It was found that the HS content of landfill leachate was 83.3%. The results of laboratory tests to determine the roles of HS in reducing the organic content of landfill leachate during Fenton process are presented. Furthermore, the performances of oxidation and coagulation of Fenton reaction on the removal of HS and COD from leachate were investigated. The change curves of HS removal were similar to those of COD. The HS removal was 30% higher than COD removal, which indicated that HS were mostly degraded into various intermediate organic compounds but not mineralized by Fenton reagent. The oxidation removal was greatly influenced by initial pH relative to the coagulation removal. The oxidation and coagulation removals were linear dependent with hydrogen peroxide and ferrous dosages, respectively. Ferrous dosage greatly influenced the coagulation removal of COD at low ratio ([H2O2]/[Fe2+] < 3.0), but not at extremely high ratio ([H2O2]/[Fe2+] > 6.0). The coagulation removal of HS was not affected obviously by oxidation due to both Fenton oxidation and coagulation remove high molecular weight organics preferentially. Higher temperature gave a positive effect on oxidation removal at low Fe2+ dosage, but this effect was not obvious at high Fe2+ dosage. |
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