4.8 Article

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

Journal

BIORESOURCE TECHNOLOGY
Volume 264, Issue -, Pages 174-179

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.05.074

Keywords

Hydrogen; High-calorific bio-H-2; High-pressure; pH; Lactate

Funding

  1. Next Generation Carbon Upcycling Project through the National Research Foundation (NRF) - Ministry of Science and ICT, Republic of Korea [2017M1A2A2042517]
  2. R&D Center for Reduction of Non-CO2 Greenhouse gases - Korea Ministry of Environment (MOE) as Global Top Environment RD Program [2017002410003]

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For the use of biologically produced H-2, 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-H-2. 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 H-2 content increased from 55% to 80%, whereas the H-2 yield decreased from 1.5 to 0.9 mol H-2/mol hexoseadded. The highest H-2 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 H-2 yields at high-pressure conditions, HPDF was found to be economically beneficial for obtaining high-calorific bio-H-2 owing to the low CO2 removal cost.

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