Effects of operational parameters on aeration on/off time in an intermittent aeration membrane bioreactor |
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| Affiliation: | 1. Department of Environmental Engineering, Daejeon University, 96-3, Yongun-dong, Dong-gu, Daejeon 300-716, South Korea;2. Division of Construction, Environment and System Engineering, Kwandong University, 7 Imchun-ri, Yangyang-up, Yangyang-gun, Kangwon-do 215-800, South Korea;3. Section of Environment Investigation, Chungnam Institute of Health and Environment Research, 44-1, Gayang-dong, Dong-gu, Daejeon 300-091, South Korea;1. Bioprocess Engineering, Department of Biotechnology, Technische Universität Berlin, Ackerstr. 71-76, ACK24, D-13355 Berlin, Germany;2. Process Dynamics and Operation, Technical University of Berlin, Sekr. KWT-9, Str. des 17. Juni 135, D-10623 Berlin, Germany;3. School of Engineering Design & Technology University of Bradford, BD7 1DP, UK;4. School of Chemical Engineering, National Technical University of Athens, 15780 Athens, Greece;1. Section of Systems Engineering and Technology, Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, N-0349 Oslo, Norway;2. Industrial Strategic Market Consultant, 257 Gano Street #7 Providence, Rhode Island 02906, United States;3. Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., GR-15780, Athens, Greece;4. Department of Mechanical, Aerospace and Civil Engineering, Brunel University, Institute of Environment, Health and Societies, Kingston Lane, Uxbridge, Middlesex UB8 3PH, UK;1. Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA;3. Department of Biotechnology, Graduate School, Korea University, 1 Anam-Dong, Seongbuk-Gu, Seoul 136-701, Republic of Korea;4. Department of Environmental Engineering, University of Seoul, Jeonnong-Dong, Dongdaemun-Gu, Seoul, Republic of Korea;1. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China;2. School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia;1. Department of Environmental Engineering, Yildiz Technical University, 34220 Istanbul, Turkey;2. Bioengineering Department, Istanbul Medeniyet University, Goztepe, 34700 Istanbul, Turkey;3. Department of Environmental Engineering, Harran University, 63300 Osmanbey, Sanliurfa, Turkey;4. School of Environmental Science and Engineering, Tongji University, Shanghai, PR China |
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| Abstract: | This study was performed to evaluate the operational parameters on aeration on/off time in an intermittent aeration membrane bioreactor for wastewater treatment. The membrane bioreactor has 5.5 L of effective working volume including a microfiber membrane. The influent wastewater contained 133mg/L of BOD, 195 mg/L COD, 98 mg/L SS, 30 mg/L total nitrogen, and 3.8 mg/L total phosphorous. Operational conditions related to aeration on/off time were 8.8 h HRT, 10 LMH flux, 10 L/min air flow, and 6300 mg/L MLSS. For 2 h/cycle, aeration on/off time was operated for 12 cycles in three variations: 60/60 min, 50/70 min (I), and 40/80 min. Suction on/off time was 10/2 min, 8/2 min, and 8/2 min, respectively, but also 50/70 min (II) when aeration on/off time was operated at 8300 mg/L MLSS. The BOD removal efficiency rate of this process was higher than 97% regardless of the aeration on/off time distribution. To get higher than 82% total nitrogen removal efficiency rate, aeration off time in the reactor needs to be more than 70 min. The specific denitrification rate was 2.68 mgNO3-N/gMv/h at 40/80 min on/off aeration times, which was 2.6 times more than at 60/60 min, and 1.4 times more than at 50/70 min (I) for 6300 mg/L MLSS. The specific nitrification rate was 1.96 mgNH4-N/gMv/h at on/off aeration times of 50/70 min, 1.4 times less than at 40/80 min, but was ineffective for nitrification. Microbial activity was affected only a little by variation in aeration on/off time, though oxygen demand was reduced by aeration off time and allowed microbial concentration to increased. EPS (extracellular polymeric substance) per unit of microorganisms increased with aeration off time. |
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