Treatment of mature landfill leachate by biofilters and Fenton oxidation |
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| Authors: | B Xie Z Lv BY Lv YX Gu |
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| Institution: | 1. Department of Environmental Science & Technology, Shanghai Key Laboratory on Urbanization Ecological Process and Ecorestoration, Shanghai 200062, East China Normal University, PR China;2. Shanghai Environment Engineering & Technology Co., Ltd., Shanghai 200070, PR China;1. École des Métiers de l’Environnement, Campus de Ker Lann, Bruz 35170, France;1. Jiangsu Provincial Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Key Laboratory of Environment Remediation and Ecological Health (Zhejiang University), Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China;3. Centre for Water Resources Research, School of Architecture, Landscape and Civil Engineering, University College Dublin, Belfield, Dublin 4, Ireland;4. Department of Environmental Science & Engineering, Fudan University, Shanghai 200438, China;5. Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA;1. College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou 310014, PR China;2. College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China;3. Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, PR China;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;2. Thi Qar University, Nasiriyah, Iraq;3. Al-Mustansiryiah University, College of Engineering, Baghdad, Iraq |
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| Abstract: | A series of processes by biofilter and Fenton oxidation to treat mature landfill leachate has been devised. At a hydraulic loading rate of 20 l m?3 d?1, a biofilter packed with aged refuse is found to remove 80% of chemical oxygen demand (COD), 89% of ammonia nitrogen and 96% of total phosphorus (TP). Particularly, TP levels dropped below 1 mg l?1. The optimal condition for Fenton oxidation was selected to be an initial pH of 5, a dosage of 0.01 and 0.02 mol l?1 of FeSO4 and H2O2, respectively, and a duration of 3 h, where COD removal efficiency reaches 58.6%, and BOD5/COD ratio is raised from 0.05 to 0.20. Subsequent treatment by a biofilter packed with slag reduces COD, ammonia nitrogen levels to less than 100, 25 mg l?1, respectively. A pilot scale experiment conducted in situ demonstrates that this series of processes exhibits a high efficiency in removing pollutants from mature landfill leachate and it is viable for application. |
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