Denitrification of coking wastewater with micro-electrolysis |
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| Authors: | Yanli Lv Yanqiu Wang Mingjun Shan Xue Shen Ying Su |
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| Institution: | 1. Postgraduate Program of Environment and Sustainable Technologies, Federal University of Fronteira Sul, Rua Jacob Reinaldo Haupenthal 1580, 97900-00, Cerro Largo, RS, Brazil;2. Postgraduate Program of Chemical Engineering, West Paraná State University, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil;3. Postgraduate Program of Mining, Metallurgy and Materials Engineering, Federal University of Rio Grande do Sul, Campus do Vale Setor IV, Av. Bento Gonçalves, 9500, Bairro Agronomia, Porto Alegre, RS, Brazil;4. Postgraduate Program of Chemical Engineering Federal University of Rio Grande do Sul, Campus do Vale Setor IV, Av. Bento Gonçalves, 9500, Bairro Agronomia, Porto Alegre, RS, Brazil;1. School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, Henan Province, Henan Engineering Laboratory of Environmental Functional Materials and Pollution Control, Xinxiang, Henan, 453007, PR China;2. Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Technology for Complex Trans–Media Pollution, Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing 100044, China;3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;1. Department of Environmental Science and Engineering, College of Ecology and Environment, Hainan University, Haikou, 570228, China;2. Operation Services Division of Hospital Wastewater Treatment, General Affairs Department, Sanya Central Hospital, Sanya, 520000, China;3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China;1. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China;3. Department of Architecture and Environment, Shenzhen Polytechnic College, Shenzhen 518055, Guangdong, China |
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| Abstract: | The denitrification for the coking wastewater was conducted by means of original battery principle with Fe-C micro-electrolysis. Fe-C serves as positive and negative electrodes, by which N02?-N and TN were reduced to nitrogen, and then the purpose of denitrifieation for coking wastewater was realized. The influences of pH value, carbon particle size, Fe/C ratio (mass ratio), reaction time and coagulation pH value on removal rate of N02?-N and TN were investigated. Coking wastewater originated from Jiamusi Coal Chemistry Engineering Company. The optimum conditions of treatment were as follows: the initial pH was 3.0, the dosage of Fe 73.5 g/L, reaction time 70 min, mass ratio of Fe/C ratio 1.0:1.3, coagulation pH 9.0 and sedimentation time 40 min. Under those conditions, nitrogen removal efficiencies of N02?-N and TN were beyond 50% and 45%, respectively. |
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