Assessment of standard aeration efficiency of different aerators and its relation to the overall economics in shrimp culture |
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| Institution: | 1. Instituto Interamericano de Tecnología y Ciencias del Agua, Universidad Autónoma del Estado de México, Carretera Toluca-Atlacomulco km 14.5, Toluca, Estado de México, 50200, Mexico;2. Facultad de Ingeniería, Universidad Autónoma del Estado de México, Ciudad Universitaria, Toluca, Estado de México, 50130, Mexico;1. Technical University of Denmark, DTU Aqua, Section for Aquaculture, The North Sea Research Centre, P.O. Box 101, DK-9850 Hirtshals, Denmark;1. Instituto Agronômico de Pernambuco – IPA, Departamento de Assistência Técnica e Extensão Rural – DEAT, Av. General San Martin, 1371, Bongi, Recife, PE, 50761-000, Brazil;2. Laboratório de Produção de Camarão – LPC, Centro de Ciências Agrárias/Universidade Estadual do Maranhão – UEMA, Cidade Universitária Campus Paulo VI, s/n, Jardim São Cristovão, São Luís, MA, 65055-310, Brazil;3. Programa de Pós-Graduação em Recursos Pesqueiros e Aquicultura, Universidade Federal Rural de Pernambuco – UFRPE, Recife, PE, 52171-900, Brazil;4. Centro de Aquicultura da Universidade Estadual Paulista – UNESP, Jaboticabal, SP, 14884-900, Brazil;5. Laboratório de Sistemas de Produção Aquícola, Departamento de Pesca e Aquicultura, UFRPE, Av. Dom Manoel de Medeiros, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia;2. School of Science and Engineering, Teesside University, Middlesbrough, TS1 3BA, UK;3. Department of Surgery, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia;4. Centre for Research in Biotechnology for Agriculture (CEBAR), Level 3, Research Management & Innovation Complex, University of Malaya, 50603, Kuala Lumpur, Malaysia;5. Centre for Energy Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia;1. School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand;2. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;3. Research and Development Institute, Valaya Alongkorn Rajabhat University under The Royal Patronage, Pathum Thani 13180, Thailand;4. Faculty of Fisheries Technology and Aquatic Resources, Maejo University, Chiang Mai, 50290, Thailand;1. Department of Environmental Sciences, Informatics and Statistics, Università Ca’ Foscari Venezia, Via Torino 155, Venice Mestre, 30170, Italy;2. Edmund Mach Foundation, Via Edmund Mach 1, 38010, San Michele all''Adige, Italy |
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| Abstract: | Aerators are essential for maintaining the dissolved oxygen level in shrimp culture operations. Many types of aerators are promoted as suitable for shrimp culture, but their comparative efficiencies and water circulation patterns are least understood. The aerators viz, modified paddlewheel, Scorpion jet, Venture jet, Wavesurge were evaluated to compare the standard aeration efficiency at different saline conditions with the commonly used paddle wheel. The modified paddlewheel had the highest mean aeration efficiency of 2.018 kg O2/ kWh at 35‰, followed by the paddlewheel with 1.434 kg O2/ kWh at 20‰ water salinity. Compared to this, the Scorpion jet and the Wavesurge have shown the highest aeration efficiency of 0.667 and 0.412 kg O2/ kWh at 20 and 35‰ water salinities, respectively, whereas the Venture jet has given only. The aerator's performance was better at medium water salinities (20 and 35‰) than low (5‰) or high saline (50‰) conditions. In addition to aeration, the paddlewheel aerator has given the maximum water circulation speed 3 ft/sec and coverage distance of 24 m. The cost economics were derived by keeping all other expenses constant except aeration associated costs. The internal rate of returns in shrimp culture with a modified paddle wheel was 127 % compared to the commonly used paddle wheel (120 %). However, the scorpion and wavesurge aerators have shown returns of 47 % and 27 % respectively across the salinities. The selection and sizing of aerators based on the biomass and efficiency of the aeration systems can make considerable headway in decreasing the cost of production and energy use. |
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| Keywords: | Aeration efficiency Water circulation Production cost economics optimum energy use Shrimp culture Environment |
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