In situ hypochlorous acid generation for the treatment of syntan wastewater |
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| Institution: | 1. Department of Chemical Engineering, IIT, Madras, Chennai 600036, India;2. Department of Chemistry, IIT, Madras, Chennai 600036, India;1. Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6 Bd Maréchal Juin, 14050 Caen, France;2. Renault SAS, Engineering Mechanic Direction, FRCTL L47 2 61, 1 allée Cornuel, F-91510 Lardy, France;3. Institut de Recherches sur la Catalyse et l''Environnement de Lyon, IRCELYON, Université Lyon 1, CNRS. 2, Av. Albert Einstein, F-69626 Villeurbanne, France;1. Department of Jute and Fibre Technology, University of Calcutta, Kolkata 700 019, India;2. ICAR- National Institute of Research on Jute and Allied Fibre Technology, Kolkata 700 040, India;1. Northeast Biotechnology Network (RENORBIO), Federal Rural University of Pernambuco (UFRPE), Recife, Pernambuco, Brazil;2. Design and Communication Centre, Academic Region Agreste Centre, Federal University of Pernambuco (UFPE), Caruaru, Pernambuco, Brazil;3. Center of Sciences and Technology, Catholic University of Pernambuco (UNICAP), Recife, Brazil;4. Advanced Institute of Technology and Innovation (IATI), Recife, Brazil;1. Research and Educational Center “Nonlinear Dynamics”, Yaroslavl State University, Yaroslavl, Russia;2. Astronomical Institute, Slovak Academy of Science, Slovakia;1. Department of Microbiology, Tokyo Medical University, Tokyo, Japan;2. Health Care Science, Graduate School of Bunkyo Gakuin University, Tokyo, Japan;3. Department of Infectious Diseases, International University of Health and Welfare, Chiba, Japan |
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| Abstract: | A new treatment process was employed to treat wastewater generated from a factory manufacturing syntan (synthetic tannin). In this treatment process, in-situ production of hypochlorous acid was achieved by the use of an aqueous sodium chloride solution for chlorine production. As the graphite anode and stainless steel cathode zones were kept unseparated, the hypochlorous acid was produced by electrolysis. The hypochlorous acid was utilized for the oxidation of organic matter present in the wastewater. The results showed that for an initial COD concentration of 10,000 mg/l, a turbidity of 277 NTU, a tannin concentration of 4000 mg/l, a temperature of 27±1°C, a current density of 42.5 mA/cm2, a sodium chloride content of 3% and an electrolysis period of 210 min showed an effluent COD concentration of 230 mg/l, a turbidity of 9 NTU, a tannin concentration below the detection limit and a temperature of 37±2°C. |
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