Practical use of response surface methodology for optimization of veterinary antibiotic removal using UV/H2O2 process |
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| Institution: | 1. Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok, 10900, Thailand;2. Department of Veterinary Technology, Faculty of Veterinary Technology, Kasetsart University, Bangkok, 10900, Thailand;3. Integrated Biorefinery Excellent Center (IBC), School of Energy and Environment, University of Phayao, Phayao, 56000, Thailand;1. ADS Environmental Services Sdn. Bhd., Lot 1-1 (Mc No.2), Likas, 88400, Kota Kinabalu, Sabah, Malaysia;2. Department of Physics and Physical Oceanography Memorial University of Newfoundland, St. John''s, NL, A1B 3X7, Canada;3. Northwest Atlantic Fisheries Centre, 80 East White Hills, St John''s, Newfoundland and Labrador, A1C 5X1, Canada;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. Fisheries Engineering Research Division, National Institute of Fisheries Science, 216, Gijang-haeanro, Gijang-eup, Gijang-gun, Busan, 46083, Republic of Korea;2. Department of Marine Production Management, Chonnam National University, 50 Daehak-ro, Yeosu, Jeollananm-Do, 59626, Republic of Korea;3. Division of Marine Production System Management, Pukyong National University, 45 Yongso-ro, Busan, 48513, Republic of Korea;1. School of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China;2. Zhejiang Institute of Freshwater Fisheries, Huzhou, 313001, China;1. Department of Biology, NTNU Norwegian University of Science and Technology, Trondheim, Norway;2. Department of Biotechnology and Food Science, NTNU Norwegian University of Science and Technology, Trondheim, Norway;3. SINTEF Ocean, Trondheim, Norway |
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| Abstract: | Three of the most commonly used veterinary antibiotics—enrofloxacin (ENR), sulfamethoxazole (SMX), and oxytetracycline (OTC)—were chosen as representative antibiotics for UV/H2O2 treatments. The objective was to determine the optimization of UV/H2O2 to remove antibiotics from aquaculture discharge water using response surface methodology. The degradation of the antibiotics was investigated under varying UV/H2O2 conditions in environments with different levels of pH, water matrices, humic acid, and constituent ions. The degradation results demonstrated that increasing the H2O2 dosage facilitated ENR degradation at a neutral pH while facilitating degradation of SMX and OTC at a slightly acidic pH. The optimum removal conditions for ENR, which was used in all influential effect experiments and the contact tank experiments, was obtained at 10 mM H2O2, a pretreated COD of 87.51 mg L?1, and an initial pH of 6.15. Among the tested anions, only the presence of Cl- showed slight positive effects on ENR degradation, due to the generation of secondary active radicals. During the reaction, the hydroxyl radical ( OH) was present at a higher pH while singlet oxygen (1O2) was slightly present at a lower pH. The experimental results from H2O2 sequential addition indicated that freshly added H2O2 could quench the recently generated OH and therefore a high H2O2 concentration with frequent adding was not necessary. Our contact system reduced the ENR concentration in both the effluent reservoir and in the UV irradiation zone. The overall results supported the use of the UV/H2O2 system to treat remnant antibiotics in the discharge water. |
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| Keywords: | Antibiotic removal Advance oxidation process Response surface methodology UV-assisted chemical oxidation |
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