High-calorific bio-hydrogen production under self-generated high-pressure condition

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For the use of biologically produced H2, removal of CO2 is an indispensable process. Unlike conventional CO2 removal methods, this study proposed a self-generated high-pressure dark fermentation (HPDF) process as a novel strategy for directly producing high-calorific bio-H2. The pressure was automatically increased by self-generated gas, while the maximum pressure inside fermenter was restricted to 1, 3, 5, 7, and 10 bar in a batch operation. As the pressure increased from 1 to 10 bar, the H2 content increased from 55% to 80%, whereas the H2 yield decreased from 1.5 to 0.9 mol H2/mol hexoseadded. The highest H2 content of 80% was obtained at both of 7 and 10 bars. Increased lactate production with increased abundance of lactic acid bacteria was observed at high-pressure. Despite the lower H2 yields at high-pressure conditions, HPDF was found to be economically beneficial for obtaining high-calorific bio-H2 owing to the low CO2 removal cost.
Publisher
ELSEVIER SCI LTD
Issue Date
2018-09
Language
English
Article Type
Article
Citation

BIORESOURCE TECHNOLOGY, v.264, pp.174 - 179

ISSN
0960-8524
DOI
10.1016/j.biortech.2018.05.074
URI
http://hdl.handle.net/10203/244530
Appears in Collection
CE-Journal Papers(저널논문)
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