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Int. J. Mol. Sci. 2015, 16(4), 8266-8293; doi:10.3390/ijms16048266

Biohydrogen Production: Strategies to Improve Process Efficiency through Microbial Routes

School of Applied Biosciences, Kyungpook National University, Daegu 702-701, Korea
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Patrick Hallenbeck
Received: 21 January 2015 / Revised: 1 April 2015 / Accepted: 3 April 2015 / Published: 14 April 2015
(This article belongs to the Special Issue Photosynthesis and Biological Hydrogen Production)
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Abstract

The current fossil fuel-based generation of energy has led to large-scale industrial development. However, the reliance on fossil fuels leads to the significant depletion of natural resources of buried combustible geologic deposits and to negative effects on the global climate with emissions of greenhouse gases. Accordingly, enormous efforts are directed to transition from fossil fuels to nonpolluting and renewable energy sources. One potential alternative is biohydrogen (H2), a clean energy carrier with high-energy yields; upon the combustion of H2, H2O is the only major by-product. In recent decades, the attractive and renewable characteristics of H2 led us to develop a variety of biological routes for the production of H2. Based on the mode of H2 generation, the biological routes for H2 production are categorized into four groups: photobiological fermentation, anaerobic fermentation, enzymatic and microbial electrolysis, and a combination of these processes. Thus, this review primarily focuses on the evaluation of the biological routes for the production of H2. In particular, we assess the efficiency and feasibility of these bioprocesses with respect to the factors that affect operations, and we delineate the limitations. Additionally, alternative options such as bioaugmentation, multiple process integration, and microbial electrolysis to improve process efficiency are discussed to address industrial-level applications. View Full-Text
Keywords: biohydrogen; dark fermentation; photofermentation; bioenergy; renewable resources biohydrogen; dark fermentation; photofermentation; bioenergy; renewable resources
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Chandrasekhar, K.; Lee, Y.-J.; Lee, D.-W. Biohydrogen Production: Strategies to Improve Process Efficiency through Microbial Routes. Int. J. Mol. Sci. 2015, 16, 8266-8293.

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