Effects of different layouts of fine-pore aeration tubes on sewage collection and aeration in rectangular water tanks |
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| Institution: | 1. CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai RD, Qingdao, 266071, PR China;2. University of Chinese Academy of Sciences, 19(A) Yuquan Road, Beijing, 100049, PR China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai RD, Qingdao, 266071, PR China;1. Department of Biosystems Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran;2. Department of Fisheries, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran;1. Department of Biological and Environmental Engineering, Cornell University, Riley Robb Hall, Ithaca, NY 14853, USA;2. Aquaculture Systems Technology, New Orleans, LA, USA;3. Department of Mechanical and Aerospace Engineering, Cornell University, Grumman Hall, Ithaca, NY 14853, USA;1. Institute of Agricultural Bio-Environmental Engineering, College of Bio-systems Engineering and Food Science, Zhejiang University, Hangzhou 310058, PR China;2. Department of Biological and Environmental Engineering, Cornell University, Riley Robb Hall, Ithaca, NY 14853, USA;1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510640, China;2. Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou, 510380, China;1. Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40014Jyväskylä, Finland;2. Natural Resources Institute Finland (LUKE), Survontie 9A, 40500Jyväskylä, Finland |
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| Abstract: | Sewage collection and dissolved oxygen (DO) management have always been the focus of industrialized recirculating aquaculture. However, there are still no reports on how to achieve efficient sewage collection and increase DO in rectangular water tanks. In the present study, the performance of sewage collection and aeration in rectangular water tanks were compared among three fine-pore aeration tubes (disc-type diffuser, four corner-type diffuser and distribute-type diffuser) layouts at three airflow rates, 6, 18, and 30 m3/h. The results of computational fluid dynamics (CFD) modeling and bait collection tests revealed that sewage collection using the four corner-type diffuser was better than using the disc-type diffuser and the distribute-type diffuser. Using the four corner-type diffuser, a strip-shaped sewage collector could be set up at the bottom of the tank to collect sewage at an airflow rate of 18 m3/h and a disc-shaped sewage collector could be set up at the bottom of the tank to collect sewage at an air flow rate of 30 m3/h. In terms of aeration, volumetric oxygen transfer coefficient (KLa20), standard oxygen transfer rate (SOTR), and standard oxygen transfer efficiency (SOTE) of the distribute-type diffuser were all the highest at the three airflow rates, followed by four corner-type diffuser, and finally the disc-type diffuser, indicating that the aeration performance in the distribute-type diffuser was optimal. However, there were no significant differences in KLa20, SOTR, and SOTE between the four corner-type diffuser and the distribute-type diffuser at both 18 and 30 m3/h airflow rates. Therefore, four corner-type diffusers were the optimal choice for recirculating aquaculture, considering the sewage collection and aeration requirements. The results of the present offer novel insights on the application of CFD in recirculating aquaculture, in addition to basic data and theoretical guidance on how to achieve efficient sewage collection and aeration in recirculating aquaculture. |
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| Keywords: | Aeration tube Layout Oxygen transfer Sewage collection Rectangular tank Computational fluid dynamics |
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