Comprehensive study on a two-stage anaerobic digestion process for the sequential production of hydrogen and methane from cost-effective molasses
SCIE
SCOPUS
- Title
- Comprehensive study on a two-stage anaerobic digestion process for the sequential production of hydrogen and methane from cost-effective molasses
- Authors
- Park, MJ; Jo, JH; Park, D; Lee, DS; Park, JM
- Date Issued
- 2010-06
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- Two-stage anaerobic digestion process has been frequently applied to the sequential production of hydrogen and methane from various organic substrates/wastes. In this study, a cost-effective byproduct of food industry, molasses, was used as a sole carbon source for the two-stage biogas-producing process. The two-stage process consisted of two reactor parts named as the first-stage hydrogenic reactor (HR) operated at pH 5.5 and 35 degrees C and the second-stage methanogenic reactor (MR) at pH 7.0 and 35 degrees C. Microbial community analysis revealed that Clostridium butyricum was the major hydrogen-producing bacteria and methanogens consisted of hydrotrophic bacteria like Methanobacterium beijingense and acetotrophic bacteria like Methanothrix soehngenii. In the first-stage process, hydrogen could be efficiently produced from diluted molasses with the highest production rate of 2.8 (+/- 0.22) L-H-2/L-reactor/d at the optimum HRT of 6 h. In the second-stage process, methane could be also produced from residual sugars and VFAs with a production rate of 1.48 (+/- 0.09) L-CH4/L-reactor/d at the optimum HRT of 6 d, at which overall COD removal efficiency of the two-stage process was determined to be 79.8%. Finally, economic assessment supported that cost-effective molasses was a potent carbon source for the sequential production of hydrogen and methane by two-stage anaerobic digestion process. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
- Keywords
- Anaerobic digestion; Two-stage process; Hydrogen; Methane; Molasses; CLOSTRIDIUM-TYROBUTYRICUM JM1; BIOHYDROGEN PRODUCTION; ETHANOL-PRODUCTION; YEAST SUPPORTS; SP NOV.; FERMENTATION; BUTYRICUM; SYSTEM; CELLS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25841
- DOI
- 10.1016/j.ijhydene.2010.03.135
- ISSN
- 0360-3199
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol. 35, no. 12, page. 6194 - 6202, 2010-06
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