Treatment of Landfill Leachate Using A/o-coagulation-bdd: Ⅰ. Parameter Optimization

SHAN Yingchun1, WANG Qingwei2, PAN Weiyi3, SHI Wanzi3, SUN Haimei3, SUN Weiling1,†

ACTA Scientiarum Naturalium Universitatis Pekinensis - - Contents - SHAN Yingchun, WANG Qingwei, PAN Weiyi, et al

1. The Key Laboratory of Water and Sediment Sciences (MOE), College of Environmental Sciences and Engineering, Peking University, Beijing 100871; 2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037; 3. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, Shenzhen 518055; † Corresponding author, E-mail: wlsun@pku.edu.cn

Abstract Landfill leachate was treated by A/o-coagulation-bdd combined processes, and the operation parameters were optimized. The optimal HRT and sludge recirculation ratio was 10.7 days and 3.5 for A/O treatment process. Reaction ph and optimal dose of ferric chloride coagulation treatment was 5.5 and 0.4 g/l. The current density and A/V ratio (anode area/reaction volum) for best performance of BDD was 60 ma/cm2 and 4 m1. CODCR concentration in raw leachte and final effluent were 13375 mg/l and 60 mg/l, with the removal efficiency of 99.5%. TOC concentration before and after treatment by combined treatment process were 6893 mg/l and 12 mg/l, with the removal efficiency of 99.8%. Ammonia nitrogen was completely removed by the combined treatment processes from 1889 mg/l to 0 mg/l. The contribution of A/O, coagulation, and BDD was 59.0%, 32.9%, and 7.6% for CODCR removal of total CODCR, was 50.5%, 46.1%, and 13.2% for TOC removal, was 84.3%, 2.5%, and 3.2% for ammonia nitrogen removal, respectively. Key words landfill leachate; A/O; coagulation; BDD; organic matter; ammonia nitrogen

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