Effect of process integration on the exergy balance of a two-stage process for fermentative hydrogen production |
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| Authors: | Ala Modarresi Walter Wukovits Domenico Foglia Anton Friedl |
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| Institution: | 1. Department of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada;2. Department of Civil and Environmental Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada;3. GreenField Specialty Alcohols Inc., Chatham, Ontario N7M 5J4, Canada;1. Microbial Biotechnology and Genomics, CSIR – Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, Delhi 110007, India;2. Department of Chemical Engineering, Konkuk University, 1 Hwayang-Dong, Gwangjin-Gu, Seoul 143-701, Republic of Korea;3. Department of Biotechnology, Pune University, Pune 411007, India;1. Laboratory of Environment-Enhancing Energy, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;2. Key Laboratory for Industrial Biocatalysis, Ministry of Education of China, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;3. Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;1. Biotechnology Program, Faculty of Science, Thaksin University, Phatthalung, 93210 Thailand;2. Department of Industrial Biotechnology, Faculty of Agro-Industry, Prince of Songkla University, Songkhla, 90112, Thailand;3. Department of Biology, Faculty of Science, Thaksin University, Phatthalung, 93210, Thailand;4. Research Center in Energy and Environment, Thaksin University, Phatthalung, 93210, Thailand;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. School of Life Science and Technology, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | In this paper, a process for the fermentative production of hydrogen is analysed with respect to its exergy efficiency. Parametric studies show the influence of used feedstock, applied process parameters as well as process and heat integration measures on exergy efficiency. It is shown that heat integration and recirculation of fermentor effluents reduce process irreversibilites and the amount of exergy leaving the process in waste streams. Nevertheless, depending on the used feedstock, a large amount of exergy leaves the process via by-products. Internal use of by-products and waste materials for providing process heat could increase chemical exergy efficiency up to 74%. |
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