Improved photo-fermentative hydrogen production by biofilm reactor with optimizing carriers and acetate concentration |
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| Affiliation: | 1. Department of Chemical and Process Engineering, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia;2. Research Centre for Sustainable Process Technology, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia;3. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia;1. CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China;2. Centre of Wastewater Resource Recovery, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, PR China;3. School of Environmental and Chemical Engineering, Anhui Vocational and Technical College, Hefei, Anhui 230011, PR China;1. State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin 150090, China;2. The University of Queensland, Australia;1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, 400044, China;2. Institute of Engineering Thermophysics, Chongqing University, Chongqing 400044, China;3. Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Chongqing University of Technology, 400044, China;1. The MaREI Centre, Environmental Research Institute, University College Cork, Cork, Ireland;2. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400044, China;3. School of Engineering, University College Cork, Cork, Ireland |
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| Abstract: | To enhance photo-fermentative hydrogen production (PFHP), biofilm reactor (BR) was employed as an ideal strategy with optimization on key factors of acetate concentration and carriers in this work. Optimal conditions for hydrogen production were acetate concentration of 4 g/L and carriers (silicon sheet) of 10 cm × 1 cm at amount of 1 piece. Biofilm formed on silicon sheet strongly improved hydrogen production compared with control reactor (CR). Cumulative hydrogen volume was enhanced about 20% from 2850 ± 130 mL/L of CR to 3349 ± 153 mL/L of BR and hydrogen yield was increased 20% from 2.61 ± 0.13 mol H2/mol acetate of CR to 3.06 ± 0.15 mol H2/mol acetate of BR at 4 g/L acetate. Protein and deoxyribonucleic acid (DNA) were important components to form the biofilm and they occupied 90% of extracellular polymeric substances (EPS). In particular, DNA, nearly 50% content of EPS, likely indicated a substantial contribution to biofilm formation and bacterial communication. Moreover, it suggested biofilm could regulate free cells to decline EPS secretion for improved hydrogen production. This work indicates BR could be a promising and economic strategy to enhance hydrogen production by photo-fermentation. |
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| Keywords: | Photo-fermentation Biohydrogen production Biofilm Carrier Extracellular polymeric substances |
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