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Hydrogen production from xylose by moderate thermophilic mixed cultures using granules and biofilm up-flow anaerobic reactors
Affiliation:1. Chemistry Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand;2. Bio-Mass Conversion to Energy and Chemicals (Bio-MEC) Research Unit, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand;3. Department of Biology, Faculty of Science, Thaksin University, Phathalung, 93110, Thailand;4. Energy Technology Program, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkla, 90110, Thailand;5. Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen, 40002, Thailand;6. Research Group for Development of Microbial Hydrogen Production Process, Faculty of Technology, KhonKaen University, KhonKaen, 40002, Thailand;1. Department of Hydraulic and Sanitation, University of São Paulo, Av. Trabalhador Sãocarlense, 400, Centro, CEP 13566-590, São Carlos, SP, Brazil;2. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, Km 235, CEP 13565-905, São Carlos, SP, Brazil;1. Institute of Microbiology, University of Innsbruck, Technikerstraße 25d, 6020, Innsbruck, Austria;2. Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Songkhla, 90112, Thailand;3. Research Group for Development of Microbial Hydrogen Production Process, Faculty of Technology, Khon Kaen University, Khon Kaen, 40002, Thailand;4. Biotechnology Program, Department of Biology, Faculty of Science, Thaksin University, Phatthalung, 93210, Thailand;1. Amity Institute of Biotechnology, Amity University Haryana, Gurgaon 122413, India;2. Department of Chemical Engineering, Feng Chia University, Taichung 40724, Taiwan;1. Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand;2. Research Group for Development of Microbial Hydrogen Production Process from Biomass, Khon Kaen University, Khon Kaen 40002, Thailand;3. Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai 90112, Thailand;1. Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Songkhla 90112, Thailand;2. Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand;3. Department of Biology, Faculty of Science, Thaksin University, Phatthalung, 93210 Thailand;1. Department of Environmental Engineering, Daegu University, Gyeongsan, Gyeongbuk 38453, Republic of Korea;2. Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan;3. Department of Civil Engineering, Daegu University, Gyeongsan, Gyeongbuk 38453, Republic of Korea;4. Sustainable Environmental Process Research Institute, Daegu University, Jillyang, Gyeongsan, Gyeongbuk 38453, Republic of Korea;5. Department of Civil, Environmental and Architectural Engineering, Korea University, Anam-Dong, Seoul 02841, Republic of Korea
Abstract:Continuous H2 production from xylose by granules and biofilm up-flow anaerobic reactor using moderate thermophilic mixed cultures was investigated. The maximum H2 yield of 251 mL H2/g-xylose with H2production rate of 15.1 L H2/L?d was obtained from granules reactor operating at the organic loading rate (OLR) of 60 g-xylose/L?d and hydraulic retention time (HRT) of 4 h. Meanwhile the highest H2 production rate of 13.3 L H2/L?d with an H2 yield of 221 mL H2/g–xylose was achieved from the biofilm reactor. Both reactors were dominated by Thermoanaerobacterium species with acetate and butyrate as main fermentation products. The microbial community of the biofilm reactor was composed of Thermoanaerobacterium species, while granules reactor was composed of Clostridium sp., Thermoanaerobacterium sp. and Caloramator sp. The granular reactor was more microbial diversity and more balance between economic efficiency in term of the hydrogen production rate and technical efficiency in term of hydrogen yield.
Keywords:Dark fermentation  Biohydrogen  Xylose  Thermophilic mixed culture  Granular reactor  Biofilm reactor
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