Electro-Fenton,hydrogenotrophic and Fe2+ ions mediated TOC and nitrate removal from aquaculture system: Different experimental strategies |
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| Authors: | Jurate Virkutyte Veeriah Jegatheesan |
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| Institution: | 1. University of Kuopio, Department of Environmental Sciences, Waste Management Group, Yliopistonranta 1E, Kuopio 70211, Finland;2. James Cook University, School of Engineering, Townsville, 4811 QLD, Australia;1. School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Chemical & Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia;3. Innovation Center in Agritechnology For Advanced Bioprocessing (ICA), Universiti Teknologi Malaysia, 84600 Pagoh, Johor, Malaysia;1. Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;2. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China;3. Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;4. Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China;1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA;4. Department of Chemical & Petroleum Engineering, University of Wyoming, Laramie, WY, 82071, USA;5. School of Energy Resources, University of Wyoming, Laramie, WY, 82071, USA;1. University of North Carolina Wilmington, Center for Marine Science, Aquaculture Program 601 S. College Road, Wilmington, NC 28403-5927, USA;2. North Carolina State University, Department of Biological and Agricultural Engineering, Raleigh, NC 27513, USA |
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| Abstract: | A number of methods for denitrification were studied including Electro-Fenton method, hydrogenotrophic as well as innovative Fe2+ mediated denitrification and their technical feasibility in terms of changes in TOC and nitrate concentrations, effect of different Fenton’s reagent dosage, current and the effect of the pH was investigated. This study was carried out using tailor made electrodialytic reactor. It was found that the highest TOC removal was achieved at pH 2.2 and 2.4 (77.1% and 97.8%, respectively) at the anode and the lowest accumulation of 33% at pH of 6.2 at the cathode. The highest TOC removal in terms of using different H2O2 concentrations was achieved at 40 mM reaching as high as 97.3%. Regardless experimental strategy, initially nitrates migrated towards the cathode due to the strong hydraulic gradient under the applied electric current. During the course of experiments, nitrates were transported towards the anode where their concentration decreased. The highest nitrate removal was achieved at 0.12 mA cm?2 electric current density (94.8%) at the anode and a complete removal at the cathode. Hydrogenotrophic denitrification was the highest reaching 92.5%, however, when Fe2+ ions as electron donor was used for the destruction of nitrates, only 66.6% removal was achieved. Denitrification using only Fe2+ ions was a factor 1.4 less than using electrically generated hydrogen or a Fenton’s reagent. |
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