Structure optimization of CycloBio fluidized sand biofilters based on numerical simulation |
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| Institution: | 1. College of Fisheries, Ocean University of China, Qingdao 266003, China;2. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;1. Jiyang College ZheJiang A & F University, Zhu’ji 311800, PR China;2. Key Laboratory of Chemical Utilization of Forestry Biomass of Zhejiang Province Zhejiang A & F University, Lin’an, Zhejiang Province, 311300, China;3. Department of Chemistry, Liaocheng University, Liaocheng 252059, PR China;1. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Columbusstrasse, D-27568, Bremerhaven, Germany;2. The University of Bremen, Bremen, Germany;3. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences Section 3.2, Geomechanics and Rheology, Telegrafenberg, D-14473, Potsdam, Germany;1. Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, 1, 3, 119991 Moscow, Russia;2. A.N. Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia;3. N.I. Pirogov Russian National Research Medical University, Ostrovitianov str. 1, 117997 Moscow, Russia;4. Department of Chemistry, University of Birmingham, Birmingham, UK;1. Division of Marine Bioscience, College of Ocean Science and Technology, Korea Maritime and Ocean University, Busan 606-791, Republic of Korea;2. Inland Research Institue, National Institute of Fisheries Science, Changwon 51688, Republic of Korea;1. Faculty of Civil and Environmental Engineering, Technion, Haifa 32000, Israel;2. Dor Research Facility, Ministry of Agriculture and the Built Environment, Israel;3. Central Fish Health Laboratory, Nir David, Ministry of Agriculture and the Built Environment, Israel |
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| Abstract: | To improve the removal efficiency for dissolved wastes within CycloBio (CB) fluidized sand biofilters (FSBs) in recirculating aquaculture systems, we investigated their structural design and optimization using computational fluid dynamics (CFD) modeling tools, an orthogonal test method, and experimental verification. Results showed that the effects of structural parameters on bed expansion from large to small were: cone height, cone diameter and slot width. The best combination was: cone height 60 mm, cone diameter 165 mm, and slot width 1.0 mm. The solid phase was well distributed not only in the radial direction, but also in the axial direction in the optimized CB FSB. The bed expansion (40%–120%) was increased about 13%. Energy savings were 21%–28% at the same bed expansion. When the optimized CB FSB was used to treat synthetic aquaculture wastewater, with three bed expansions and four levels of C/N, total ammonia nitrogen removal rate expressed per unit of expanded bed volume was high, from 629 to 881 g m?3 day?1. All results indicated that the structure of the optimized CB FSB was more reasonable and that the combination of CFD simulation and the orthogonal test method could be successfully applied to structural optimization. |
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| Keywords: | Recirculating aquaculture system Cyclobio fluidized sand biofilters Numerical simulation Optimization design Orthogonal test |
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