Size fractionation of organic matter and heavy metals in raw and treated leachate |
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| Authors: | Rui Li Dongbei Yue Jianguo Liu Yongfeng Nie |
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| Institution: | 1. Université de Franche-Comté, Laboratoire de Chrono-Environnement, UMR CNRS 6249, 1, Place Leclerc, F-25030 Besançon cedex, France;2. Université de Sfax, Faculté des Sciences de Sfax, Unité de recherche UR/11ES72, Biodiversité et Ecosystèmes Aquatiques, Route Soukra, CP 3000 Sfax, Tunisia;1. Residues and Resource Reclamation Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;1. College of Environmental Science and Engineering, Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha 410082, PR China;2. China National Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410014, PR China;1. University of Kinshasa (UNIKIN), Faculty of Science, Department of Chemistry, B.P. 190, Kinshasa XI, Democratic Republic of the Congo;2. Faculty of Science, F.-A. Forel Institute and Institute of Environmental Sciences, University of Geneva, 66, Boulevard Carl-Vogt, CH – 1205 Geneva, Switzerland;3. University of Kinshasa (UNIKIN), Faculty of Science, Department of Environmental Sciences, B.P. 190, Kinshasa XI, Democratic Republic of the Congo;4. University of Geneva, Institute for Environmental Sciences, enviroSPACE Lab., Uni Carl-Vogt, 66 Boulevard Carl-Vogt, CH – 1205 Geneva, Switzerland;5. Université Pédagogique Nationale (UPN), Croisement Route de Matadi et Avenue de la Libération, Quartier Binza/UPN, B.P. 8815, Kinshasa, Democratic Republic of the Congo;1. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong Special Administrative Region;3. City University of Hong Kong, Shenzhen Research Institute, Shenzhen 518057, China;4. Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Center for Water Quality and Conservation of the Pearl River Delta, Guangzhou University, Guangzhou 510006, China;5. Monitoring Centre of Pearl River Valley Aquatic Environment, Guangzhou 510611, China;6. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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| Abstract: | This study characterized the organic matter and heavy metals in the leachate from two typical municipal solid waste (MSW) sanitary landfills in China, the recently established (3-year-old) Liulitun landfill and the mature (11-year-old) Beishenshu landfill, using a size fractionation procedure. The organic matter of all raw and treated leachate samples primarily existed in a truly-dissolved fraction with an apparent molecular weight (AMW) of <1 kDa, and its percentage decreased with an increase in overall AMW. The leachate from the newer landfill had a higher percentage of truly-dissolved organic matter. After anaerobic treatment, this leachate had a similar size fraction of organic matter to that seen for the raw leachate of the mature landfill. Biochemical processes had different removal efficiencies for various types of AMW organic matter, and the concentration of moderate AMW organic matter appeared to increase throughout these processes. Most of the heavy metals existed in a colloidal fraction (AMW >1 kDa and particle size <0.45 μm). The behaviors of different species of heavy metals had large variations. The size fractions of heavy metal species were significantly affected by treatment processes and landfill age, except for Zn. The concentration ratio of heavy metals to organic matter was maximal in the colloidal fraction and showed an inverse change to that seen for organic matter concentration changes caused by biochemical processes. Consequently, the pollution levels of heavy metals were substantially increased by treatment processes, although their concentrations decreased. |
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