Decreasing methane production in hydrogenogenic UASB reactors fed with cheese whey |
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| Affiliation: | 1. División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica. Camino a la Presa San José 2055, Lomas 4a Sección, C.P. 78216, San Luis Potosí, S.L.P, Mexico;2. División de Geociencias Aplicadas, Instituto Potosino de Investigación Científica y Tecnológica. Camino a la Presa San José 2055, Lomas 4a Sección, C.P. 78216, San Luis Potosí, S.L.P, Mexico;1. Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering (EESC), University of São Paulo (USP), Environmental Engineering, Bloco 4-F, Av. João Dagnone, 1100 – Santa Angelina, 13.563-120 São Carlos, SP, Brazil;2. Chemical Engineering Department, Polytechnic School, University of São Paulo (DEQ/EP/USP), Av. Prof. Lineu Prestes 580, Bloco 18 – Conjunto Das Químicas, SP, 05508-000, Brazil;1. Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla, C.P. 76230, Querétaro, Qro, Mexico;2. Posgrado en Biociencias, Universidad de Guanajuato CIS, Ex Hacienda El Copal Km. 9, Carretera Irapuato-Silao, Guanajuato, Mexico;3. Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, C.P. 04510, Mexico;1. Mauá School of Engineering, Mauá Institute of Technology, Praça Mauá 1, CEP 09.580-900, São Caetano do Sul, SP, Brazil;2. São Carlos School of Engineering, University of São Paulo (EESC/USP), Av. Trabalhador São-Carlense 400, CEP 13.566-590, São Carlos, SP, Brazil;1. CTBE: Brazilian Bioethanol Science and Technology Laboratory - CNPEM, Rua Giuseppe Máximo Scolfaro, 10.000 Bairro Guará, Barão Geraldo, 13.083-970 Campinas, SP, Brazil;2. Laboratorio de Ecología Microbiana, Instituto de Investigaciones Biológicas Clemente Estable, Av. Italia 3318, Montevideo, Uruguay;3. Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering (EESC), University of São Paulo (USP), Engenharia Ambiental - Bloco 4-F, Av. João Dagnone, 1100 - Santa Angelina, 13.563-120 São Carlos, SP, Brazil;1. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, CEP 13565-905 São Carlos, SP, Brazil;2. Department of Hydraulic and Sanitation, University of São Paulo, Av. Trabalhador Sãocarlense, 400, Centro, CEP 13566-590 São Carlos, SP, Brazil |
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| Abstract: | One of the problems in fermentative hydrogen producing reactors, inoculated with pre-treated anaerobic granular sludge, is the eventual methane production by hydrogen-consuming methanogens. In this study, strategies such as reduction of pH and HRT, organic shock loads and repeated biomass heat treatment were applied to hydrogenogenic UASB reactors fed with cheese whey, that showed methane production after certain time of continuous operation (between 10 and 60 days). The reduction of pH to 4.5 not only decreased methane production but also hydrogen production. Organic shock load (from 20 to 30 g COD/L-d) was the more effective strategy to decrease the methane production rate (75%) and to increase the hydrogen production rate (172%), without stopping reactor operation. Repeated heat treatment of the granular sludge was the only strategy that inhibited completely methane production, leading to high volumetric hydrogen production rates (1.67 L H2/L-d), however this strategy required stopping reactor operation; in addition homoacetogenesis, another hydrogen-consuming pathway, was not completely inhibited. This work demonstrated that it was possible to control the methane activity in hydrogen producing reactors using operational strategies. |
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| Keywords: | Biohydrogen Heat treatment Homoacetogenesis Methane Organic shock load UASB |
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