Mathematical modeling of biological sulfide removal in a fed batch bioreactor |
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| Affiliation: | 1. School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran;2. Environmental Research Center in Petroleum and Petrochemical Industry, Shiraz University, Shiraz, Iran;3. Center of Biotechnology Research of Shiraz University, Iran;1. Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, C/ Dr. Mergelina, s/n. 47011, Valladolid, Spain;2. CADAGUA S. A., Gran Vía 45-7, 48011 Bilbao, Spain;3. Independent Researcher, Spain;1. School of Chemical Engineering, University of Campinas (UNICAMP), Zip Code 13083-852, Campinas, São Paulo, Brazil;2. Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, São Paulo, Brazil;3. Chemical Engineering and Food Engineering Department - Federal University of Santa Catarina, Zip Code 88040-900, Florianópolis, Santa Catarina, Brazil;4. Department of Chemical Engineering, Federal University of São Carlos, Zip Code 13565-905, São Carlos, São Paulo, Brazil;5. Department of Biochemistry, Federal University of Santa Catarina, Zip Code 88040-900, Florianópolis, Santa Catarina, Brazil;1. Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Di Biasio 43, 03043 Cassino (FR), Italy;2. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy;3. Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, National University of Ireland Galway, University Road, Galway H91 TK33, Ireland;4. School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom;5. Microbial Communities Laboratory, School of Natural Sciences and Ryan Institute, National University of Ireland Galway, University Road, Galway H91 TK33, Ireland;6. UNESCO-IHE, Institute for Water Education, PO Box 3015, 2601 DA Delft, The Netherlands;1. Laboratory for Research on Advanced Processes for Water Treatment, Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico;2. Department of Chemical Engineering and Food Technologies, Wine and Agrifood Research Institute (IVAGRO), Faculty of Sciences, University of Cadiz, Av. República Saharaui s/n, 11510 Puerto Real, Cádiz, Spain;3. Tecnologico de Monterrey, Escuela de Ingeniería y Ciencias, Epigmenio González 500, San Pablo, 76130 Santiago de Querétaro, Qro, Mexico |
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| Abstract: | In this study, biological sulfide removal is investigated in a fed batch bioreactor. In this process, sulfide is converted into elemental sulfur particles as an intermediate in the oxidation of hydrogen sulfide to sulfate. The main product is sulfur at low dissolved oxygen or at high sulfide concentrations and also more sulfates are produced at high dissolved oxygen. According to the carried out reactions, a mathematical model is developed. The model parameters are estimated and the model is validated by comparing with some experimental data. The results show that, the proposed model is in a good agreement with experimental data. According to the experimental result and mathematical model, sulfate and sulfur selectivity are sensitive to the concentration of dissolved oxygen. For sulfide concentration 0.2 (mM) in the bioreactor and dissolved oxygen of 0.5 ppm, only 10% of sulfide load is converted to sulfate, while it is 60% at the same sulfide concentration and dissolved oxygen of 4.5 ppm. At high sulfide load to the bioreactor, the concentration of uneliminated sulfide increases; it leads to more sulfur particle selectivity and consequently, less sulfate selectivity. |
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