Sulfide production and wastewater quality in pressure mains |
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| Affiliation: | 1. Water and Environmental Engineering, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan;2. Research Center for Environmental Quality Management, Kyoto University, 1-2 Yumihama, Otsu, 520-0811, Japan;3. Division of Earth and Environmental Science, Graduate School of Science and Engineering, Kagoshima University, Korimoto 1-21-24, Kagoshima 890-0065, Japan;1. LSQM – Laboratório de Síntese Química de Materiais – DEMat, Universidade Federal do Rio Grande do Norte – UFRN, P.O. Box 1524, 59078-97 Natal, RN, Brazil;2. LIEC, Universidade Federal de São Carlos – UFSCar, P.O. Box 676, 13565-905 São Carlos, SP, Brazil;3. Departamento de Química Física y Analítica, Universitat Jaume I, 12071 Castello, Spain;4. Instituto de Física de São Carlos, Universidade de São Paulo, USP, 13560-970 São Carlos, SP, Brazil;5. Universidade Estadual do Piauí, Departamento de Química – CCN, Rua João Cabral, P.O. Box 2231, 64002-150 Teresina, PI, Brazil;1. State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Key Laboratory of Superlight Materials & Surface Technology, Harbin Engineering University, Ministry of Education, Harbin, 150001, China;1. John and Willie Leone Family Department of Energy and Mineral Engineering and The EMS Energy Institute, The Pennsylvania State University, 110 Holser Building, University Park, PA 16802, United States;2. School of Chemical and Petroleum Engineering, Curtin University of Technology, GPO Box U1987, Perth 6845, Western Australia, Australia;3. University of New South Wales, High Street, Kensington, NSW 2052, Australia |
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| Abstract: | An empirical model for predicting sulfide production in pressure mains (Hvitved-Jacobsen et al., 1988) was evaluated and modified based on results obtained from two intercepting pressure mains located in the Northern part of Jutland, Denmark. Mass balances in pipe influent and effluent were made for volatile fatty acids, VFA (formate, acetate, propionate and butyrate), dissolved COD, DOC and sulfide and biofilm surface rate for sulfide and organic matter were calculated. Relatively high sulfide formation rates were observed at low temperatures (5–12°C). The sulfide production rate strongly depended on wastewater quality in terms of VFA and dissolved carbohydrate concentration. Based on these two sets of observations — wastewater quality and temperature — the original empirical model was modified. |
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