The effect of hydraulic retention time on thermophilic dark fermentative biohydrogen production in the continuously operated packed bed bioreactor |
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| Affiliation: | 1. Dokuz Eylul University, Department of Environmental Engineering, Izmir, Turkey;2. Dokuz Eylul University, The Graduate School of Natural and Applied Sciences, Department of Biotechnology, Izmir, Turkey;1. Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Social and Preventive Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China;2. Institute of Agricultural Engineering, Huanghe S & T University, Zhengzhou 450006, China;3. Henan International Joint Laboratory of Biomass Energy and Nanomaterials, Zhengzhou 450002, China;1. Tampere University, Faculty of Engineering and Natural Sciences, P.O. Box 541, FI-33104, Tampere, Finland;2. Department of Civil, Architectural and Environmental Engineering, University of Napoli Federico II, Via Claudio, 21, 80125, Napoli, Italy;3. INRAE, Univ Montpellier, LBE, Narbonne, France;1. Green Energy Technology Research Group, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Environment and Labor Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Department of Environmental Engineering and Science, Feng Chia University, Taiwan;4. Green Energy Development Center, Feng Chia University, Taiwan;1. Department of Safety Health and Environmental Engineering, Central Taiwan University of Science and Technology, Taichung, Taiwan;2. Department of Chemical Engineering, Feng Chia University, Taichung, Taiwan;3. Department of Environmental Engineering and Science, Feng Chia University, Taichung, Taiwan;4. Department of Chemical and Materials Engineering, Tunghai University, Taichung, Taiwan;5. Research Center for Smart Sustainable Circular Economy, Tunghai University, Taichung, Taiwan;6. Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan |
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| Abstract: | The main objective of the study is to investigate the effect of hydraulic retention times on continuous dark fermentative biohydrogen production in an up-flow packed bed reactor (UPBR) containing a novel microorganism immobilization material namely polyester fiber beads. The hydrogen producing dark fermentative microorganisms were obtained by heat-pretreatment of anaerobic sludge from the acidogenic phase of an anaerobic wastewater treatment plant. Glucose was the sole carbon source and the initial concentration was 15 ± 1 g/L throughout the continuous feeding. UPBR was operated under the thermophilic condition at T = 48 ± 2 °C and at varying HRTs between 2 h and 6 h. The hydrogen productivity of continuously operated UPBR increased with increasing HRT. Hydrogen production volume varied between 4331 and 6624 ml/d, volumetric hydrogen production rates (VHPR) were obtained as 3.09–4.73 L H2/L day, and hydrogen production yields (HY) were 0.49 mol/mol glucose-0.89 mol/mol glucose depending on HRT. Maximum daily hydrogen volume (6624 ml/d), the yield (0.89 mol/mol glucose) and VHPR (4.73 L H2/L day) were obtained at HRT = 6 h. The production rate and the yield decreased with increasing organic loading rate due to substrate inhibition. |
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| Keywords: | Biohydrogen Immobilization Continuous dark fermentation Thermophilic Packed-bed reactor Hydraulic retention time |
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