Syngas fermentation of Clostridium carboxidivoran P7 in a hollow fiber membrane biofilm reactor: Evaluating the mass transfer coefficient and ethanol production performance |
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| Institution: | 1. Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA;2. Center for Sustainable and Environmental Technologies, Iowa State University, Ames, IA 50011, USA;1. Chemical Engineering Laboratory, Faculty of Sciences, University of La Coruña, Rúa da Fraga 10, E-15008 La Coruña, Spain;2. Institute of Microbiology and Biotechnology, University of Ulm, Albert Einstein Allee 11, D-89081 Ulm, Germany;1. LEQUIA, Institute of the Environment, University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain;2. Group of Molecular Microbial Ecology, Institute of Aquatic Ecology (IEA), University of Girona, Campus Montilivi, E-17071 Girona, Catalonia, Spain;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Republic of Korea;2. Department of Chemical Engineering, Kyung Hee University, Gyeonggi-do 446-701, Republic of Korea;3. College of Engineering, Swansea University, Swansea SA2 8PP, United Kingdom;4. Fuel Cell Institute, National University of Malaysia, 43600 UKM, Bangi, Malaysia;5. Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Republic of Korea;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea;2. Department of Chemical Engineering, Kyung Hee University, Gyeonggi-do 446-701, Republic of Korea;3. Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Republic of Korea;1. Biosystems and Agricultural Engineering Department, Oklahoma State University, Stillwater, OK, United States;2. Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, United States |
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| Abstract: | Gasification followed by syngas fermentation is a unique hybrid process for converting lignocellulosic biomass into fuels and chemicals. Current syngas fermentation faces several challenges with low gas–liquid mass transfer being one of the major bottlenecks. The aim of this work is to evaluate the performance of hollow fiber membrane biofilm reactor (HFM-BR) as a reactor configuration for syngas fermentation. The volumetric mass transfer coefficient (KLa) of the HFM-BR was determined at abiotic conditions within a wide range of gas velocity/flowrate passing through the hollow fiber lumen and liquid velocity/flowrate passing through the membrane module shell. The KLa values of the HFM-BR were higher than most reactor configurations such as stir tank reactors and bubble columns. A continuous syngas fermentation of Clostridium carboxidivorans P7 was implemented in the HFM-BR system at different operational conditions, including the syngas flow rate, liquid recirculation between the module and reservoir, and the dilution rate. It was found that the syngas fermentation performance such as syngas utilization efficiency, ethanol concentration and productivity, and ratio of ethanol to acetic acid depended not only on the mass transfer efficiency but also the characteristics of biofilm attached on the membrane module (biofouling or abrading of the biofilm). The HFM-BR results in a highest ethanol concentration of 23.93 g/L with an ethanol to acetic acid ratio of 4.79. Collectively, the research shows the HFM-BR is an efficient reactor system for syngas fermentation with high mass transfer. |
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| Keywords: | Syngas fermentation Lignocellulosic biomass Mass transfer Hollow fiber membrane biofilm reactor Ethanol |
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