Removal mechanism of trace oxytetracycline by aerobic sludge |
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| Authors: | Man-hong Huang Yu-dong Yang Dong-hui Chen Liang Chen Hui-dong Guo |
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| Institution: | 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;2. Shanghai Institute of Technology, Shanghai 200235, China;3. Shanghai Kanghuan Solid Waste Treatment Co., Ltd, Shanghai 201815, China;1. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan;2. National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-0053, Japan;3. Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan;1. CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Civil and Environmental Engineering, National University of Singapore, 21 Lower Kent Ridge Road, 119077, Singapore;1. Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba and Unidad de Investigación y Desarrollo en Tecnología Farmacéutica (UNITEFA) CONICET-UNC, Ciudad Universitaria, X5000HUA Córdoba, Argentina;2. Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina;3. IFEG (CONICET), Ciudad Universitaria, X5000HUA Córdoba, Argentina;1. Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, PR China;2. Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, PR China;3. Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, PR China;4. College of Resources, Sichuan Agricultural University, Chengdu 611130, PR China;5. State Key Laboratory of Environment-friendly Energy Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defense Science & Technology, Southwest University of Science and Technology, Mianyang 621010, PR China |
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| Abstract: | To investigate the mechanism of removal of selected pharmaceuticals in activated sludge systems, laboratory-scale batch experiments were conducted to assess the adsorption and degradation behavior of trace oxytetracycline (OTC). The adsorption equilibrium of OTC was observed in 30 min and the adsorption process could be well described by a pseudo-second-order model with a rate of 0.362 L μg?1 min?1. The OTC adsorption rate decreased with increasing temperature and could be fitted by the Freundlich isotherm. The linear partition coefficients (Kd) were 1.19, 0.999, and 0.841 L g?1 at temperatures of 15, 20, and 25 °C, respectively. Thermodynamic analysis revealed that the adsorption of OTC onto the inactivated sludge was spontaneous (ΔG = ?16.7 to ?17.0 kJ mol?1), enthalpy-driven (ΔH = ?24.9 kJ mol?1), entropy-retarded (ΔS = ?27.4 J (mol K)?1), and predominantly a physical adsorption. |
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