Comparison between a moving bed membrane bioreactor and a conventional membrane bioreactor on organic carbon and nitrogen removal |
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| Authors: | Shuai Yang Fenglin Yang Zhimin Fu Ruibo Lei |
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| Institution: | 1. Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China;2. State Key Laboratory of Coastal and Offshore Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, PR China;1. Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali – Università degli Studi di Palermo, Viale delle Scienze, 90128 Palermo, Italy;2. Facoltà di Ingegneria e Architettura – Università di Enna “Kore”, Cittadella Universitaria, 94100 Enna, Italy;1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Basic Research Service, Ministry of Science and Technology of the People’s Republic of China, Beijing 100862, China;3. State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, China;4. School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;1. Department of Water Managment and Environment, Faculty of Natural Resources and Environment, The Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan;2. Chemical Engineering Department, Taibah University, KSA, Saudi Arabia;3. Chemical Engineering Department, Faculty of Engineering and Technology, The University of Jordan, 11942 Amman, Jordan;4. Department of Civil Engineering, Faculty of Engineering, Jerash University, Jerash, Jordan;5. Department of Paper Science and Engineering, Faculty of Natural Resources, University of Wisconsin Stevens Point, Stevens Point, WI 54481, USA;1. Department of Civil Engineering, University of Granada, 18071 Granada, Spain;2. Institute for Water Research, University of Granada, 18071 Granada, Spain;3. Department of Chemical Engineering, University of Granada, 18071 Granada, Spain;1. Department of Civil Engineering, University of Granada, 18071 Granada, Spain;2. Institute for Water Research, University of Granada, 18071 Granada, Spain;1. Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore;3. Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan, 030006, China |
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| Abstract: | A membrane bioreactor filled with carriers instead of activated sludge named a moving bed membrane bioreactor (MBMBR) was investigated for simultaneously removing organic carbon and nitrogen in wastewater. Its performance was compared with a conventional membrane bioreactor (CMBR) at various influent COD/TN ratios of 8.9–22.1. The operational parameters were optimized to increase the treatment efficiency. COD removal efficiency averaged at 95.6% and 96.2%, respectively, for MBMBR and CMBR during the 4 months experimental period. The MBMBR system demonstrated good performance on nitrogen removal at different COD/TN ratios. When COD/TN was 8.9 and the total nitrogen (TN) load was 7.58 mg/l h, the TN and ammonium nitrogen removal efficiencies of the MBMBR were maintained over 70.0% and 80.0%, respectively, and the removed total nitrogen (TN) load reached to 5.31 mg/l h. Multifunctional microbial reactions in the carrier, such as simultaneous nitrification and denitrification (SND), play important roles in nitrogen removal. In comparison, the CMBR did not perform so well. Its TN removal was not stable, and the removed total nitrogen (TN) load was only 1.02 mg/l h at COD/TN ratio 8.9. The specific oxygen utilization rate (SOUR) showed that the biofilm has a better microbial activity than an activated sludge. Nevertheless, the membrane fouling behavior was more severe in the MBMBR than in the CMBR due to a thick and dense cake layer formed on the membrane surface, which was speculated to be caused by the filamentous bacteria in the MBMBR. |
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