Treatment of municipal landfill leachate using a combined anaerobic digester and activated sludge system |
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| Authors: | S Kheradmand A Karimi-Jashni M Sartaj |
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| Institution: | 1. Department of Civil & Environmental Engineering, University of Shiraz, Shiraz 7134851156, Iran;2. Department of Civil Engineering, Isfahan University of Technology, Isfahan 841568311, Iran;1. Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA;2. Waste Management, Gaithersburg, MD 20882, USA;1. Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Envirosource Sdn Bhd, No. 13A, Jalan Jernang Jaya 1, Taman Jernang Jaya, 43650 Bandar Baru Bangi, Selangor, Malaysia;1. College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, PR China;2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;3. Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China;4. School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, PR China;1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China;2. Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China |
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| Abstract: | The main objective of this study was to assess the feasibility of treating sanitary landfill leachate using a combined anaerobic and activated sludge system. A high-strength leachate from Shiraz municipal landfill site was treated using this system. A two-stage laboratory-scale anaerobic digester under mesophilic conditions and an activated sludge unit were used. Landfill leachate composition and characteristics varied considerably during 8 months experiment (COD concentrations of 48,552–62,150 mg/L). It was found that the system could reduce the COD of the leachate by 94% at a loading rate of 2.25 g COD/L/d and 93% at loading rate of 3.37 g COD/L/d. The anaerobic digester treatment was quite effective in removing Fe, Cu, Mn, and Ni. However, in the case of Zn, removal efficiency was about 50%. For the rest of the HMs the removal efficiencies were in the range 88.8–99.9%. Ammonia reduction did not occur in anaerobic digesters. Anaerobic reactors increased alkalinity about 3.2–4.8% in the 1st digester and 1.8–7.9% in the 2nd digester. In activated sludge unit, alkalinity and ammonia removal efficiency were 49–60% and 48.6–64.7%, respectively. Methane production rate was in the range of 0.02–0.04, 0.04–0.07, and 0.02–0.04 L/g CODrem for the 1st digester, the 2nd digester, and combination of both digesters, respectively; the methane content of the biogas varied between 60% and 63%. |
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