Biological hydrogen production from CO: Bioreactor performance |
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| Institution: | 1. School of Bioprocess Engineering, University Malaysia Perlis, Jejawi Complex 3, 02600 Arau, Perlis, Malaysia;2. Faculty of Chemical Engineering, Noushirvani Institute of Technology, University of Mazandaran, Babol, Iran;3. Department of Environmental Science, Faculty of Natural Resources and Marine Science, Tarbiat Modares University (TMU), Nour, Iran;4. School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, Nibong Tebal, Seberang Perai Selatan, 14300 Penang, Malaysia;1. Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India;2. Center for the Environment, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India;3. Department of Chemical Engineering, Annamalai University, Annamalainagar, 608002, Tamil Nadu, India;1. School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea;2. Bioenergy & Environmental Sustainable Membrane Technology (BEST) Research Group, Department of Chemical Engineering, COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan;3. Gwangju Bio/Energy R&D Center, Korea Institute of Energy Research (KIER), Gwangju 61003, Republic of Korea;1. Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing, 100029, China;2. Department of Biological & Agricultural Engineering, University of California, Davis, CA, 95616, USA;1. Chemical Engineering Department, Jadavpur University, Kolkata 700032, India;2. Chemical Engineering Department, Heritage Institute of Technology, Kolkata 700107, India |
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| Abstract: | This paper presents an alternative solution to the current problem faced by the world; diminishing of fossil fuel. Bioconversion of synthesis gas to hydrogen as clean fuel was catalyzed by a photosynthetic bacterium, Rhodospirillum rubrum. The clean fuel production was biologically mediated by the water–gas shift reaction in a 2 l bioreactor. The work performed was on agitation effects on hydrogen production, KLa and power consumption. The results show that 500 rpm was the suitable agitation rate to be employed. The hydrogen production was optimized at 0.44 ± 0.023 atm giving a KLa of 86.4 ± 3.5 h−1. The production rate was 9.6 mmol H2/h. The maximum light conversion efficiency at agitation speed of 800 rpm, light intensity of 500 lux (732 kW/m2) and 4 g/l inlet acetate concentration was about 10.84 ± 1.73%. At this condition, the maximum CO conversion efficiency was found to be 81 ± 5.6%. The ratio of power per volume was calculated to be 322.30 ± 12.14 kW/m3 and foaming problem was successfully avoided. The corresponding power consumption was estimated to be about 0.64 ± 0.03 kW, while the output hydrogen energy was determined to be 643.2 ± 26 kW. A prolonged operation of continuous hydrogen production employing a microsparger showed stable behaviour for a duration of 27 days. |
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