Application of chemical precipitation and membrane bioreactor hybrid process for piggery wastewater treatment |
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| Authors: | Thipsuree Kornboonraksa Hong Shin Lee Seung Hwan Lee Chart Chiemchaisri |
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| Affiliation: | 1. Department of Environmental Engineering, School of Civil and Environmental Engineering, Kumoh National Institute of Technology, Gyeongbuk 730-701, Republic of Korea;2. Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand;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. School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia;1. Gebze Institute of Technology, Department of Environmental Engineering, 41400 Gebze, Turkey;2. Gebze Institute of Technology, Department of Chemistry, 41400 Gebze, Turkey;1. Environment and Public Health Research Group, Aquatic Research Centre, School of Environment and Technology, University of Brighton, Cockcroft Building, Lewes Road, Brighton, BN2 4GJ, United Kingdom;2. Thames Water Utilities Limited, Clearwater Court, Vastern Road, Reading, Berkshire RG1 8DB, United Kingdom;1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China;2. Institute for Environmental Genomics, Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73019, USA;3. Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
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| Abstract: | This study was conducted to investigate the chemical precipitation (CP) and membrane bioreactor (MBR) hybrid process for the treatment of piggery wastewater. Average removal efficiencies for BOD, COD and turbidity in CP process were 64.3%, 77.3% and 96.4%, respectively. CP process had a moderate effect on NH3–N removal (40.4%) which improved up to 98.2% mainly due to nitrification and filtration processes in MBR. The average removal efficiencies of BOD, COD and turbidity in MBR were 99.5%, 99.4% and 99.8%, respectively. Monod equation was used to explain the microbial activities in terms of specific growth rate. The specific growth rate of bacteria in aeration tank (N-batch) and anoxic tank (D-batch) were 0.013 and 0.005 d?1 with a biomass yield of 0.78 and 0.43 mg MLSS produced/mg COD utilized, respectively. Microorganisms from the N-batch and D-batch showed a low-level of nitrifying and moderate-level of denitrifying capabilities which were 1.08 mg NH3–N/(g MLVSS.h) and 2.82 mg NO3–N/(g MLVSS.h), respectively. Carbohydrates were the main component in extracellular polymeric substance (EPS) compounds that could be attached to the membrane surface easily and led to membrane biofouling. The increase of MLSS, EPS and sludge viscosity concentration, decrease of sludge floc size and incomplete chemical cleaning procedure resulted in the increase of membrane resistance. Total membrane resistance increased from 3.19 × 1012 m?1 to 5.43 × 1014 m?1. |
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