期刊
BIORESOURCE TECHNOLOGY
卷 298, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122549
关键词
Acetogenesis; Syngas fermentation; Biomass boosting; Eubacterium limosum
资金
- C1 Gas Refinery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2015M3D3A1A01064883]
- New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grants from the Ministry of Trade, Industry and Energy [20173010092460]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173010092460] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015M3D3A1A01064883] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study employed a simultaneous gas feeding and cell-recycled reaction (SGCR) system to ferment CO using Eubacterium limosum KIST612. A bubble column reactor was equipped with an ex-situ hollow fiber membrane module to enable cell recycling. The internal gas circulation rate was adjusted by controlling the pump speed to provide sufficient gas supplement to the microorganism. Gas feedings were conducted by either the use of a gas-tight bag (Batch), a pressurized gas cylinder (Continuous), or a sequential combination of the two (Mixed feeding). Mixed feeding mode achieved higher biomass (9.7 g/L) and acetate (9.8 g/L) concentrations than Batch mode (3.2 g/L biomass and 7.0 g/L acetate) or Continuous mode (5.0 g/L biomass and 8.1 g/L acetate). The high acetate titer in Mixed feeding mode was achieved due to the high concentration of cells secured in a short time at the initial operation stage and maintaining a high specific growth rate.
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