Pilot study on the advanced treatment of landfill leachate using a combined coagulation,fenton oxidation and biological aerated filter process |
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| Authors: | Xiaojun Wang Sili Chen Xiaoyang Gu Kaiyan Wang |
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| Institution: | 1. School of Environmental Science and Engineering, South China University of Technology, Guangzhou Higher Education Mega Center, 510006, PR China;2. South China Institute of Environmental Science, State Environmental Protection Administration, Guangzhou, 510655, PR China;1. Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, United States;2. Department of Civil and Environmental Engineering, Lamar University, Beaumont, TX 77710, United States;3. Brown and Caldwell, Upper Saddle River, New Jersey 07458, United States;1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;2. The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, China;3. Hualu Environmental Technology Co., Ltd., Guangzhou, China;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People’s Republic of China;2. Thi Qar University, Nasiriyah, Iraq;1. College of Environment And Energy, South China University of Technology, Guangzhou 510006, China;2. HuaLu Environmental Technology Co., Ltd., Guangzhou, China;1. Program of Chemical Engineering, West Parana State University - UNIOESTE, Campus of Toledo, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil;2. Program of Environment and Sustainable Technologies, Federal University of South Border, Rua Major Antônio Cardoso 1580, 97900-00, Cerro Largo, RS, Brazil;1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, China;2. Key Laboratory of Special Wastewater Treatment of Sichuan Province Higher Education System, College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China |
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| Abstract: | Mature landfill leachate is typically non-biodegradable. A combination process was developed that includes coagulation, Fenton oxidation, and biological aerated filtering to treat biologically-produced effluent. In this process, coagulation and Fenton oxidation were applied in order to reduce chemical oxygen demand (COD) organic load, and enhance biodegradability. Poly-ferric sulfate (PFS) at 600 mg l?1 was found to be a suitable dosage for coagulation. For Fenton oxidation, an initial pH of 5, a total reaction time of 3 h, and an H2O2 dosage of 5.4 mmol l?1, with a (H2O2)/n(Fe2+) ratio of 1.2 and two-step dosing were selected to achieve optimal oxidation. Under these optimal coagulation and Fenton oxidation conditions, the COD removal ratios were found to be 66.67% and 56%, respectively. Following pretreatment with coagulation and Fenton oxidation, the landfill leachate was further treated using a biological aerated filter (BAF). Our results show that COD was reduced to 75 mg l?1, and the color was less than 10 degrees. |
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