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Long-term Operation of Continuous Culture of the Hyperthermophilic archaeon, Thermococcus onnurineus for Carbon Monoxide-dependent Hydrogen Production
- Source :
- Biotechnology and Bioprocess Engineering. 25:485-492
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- In this study, we performed a kinetic analysis of CO-dependent H2 production by metabolically engineered Thermococcus onnurineus NA1, MC01 in terms of the cell activity as well as mass transfer rate. We conducted continuous cultures with varying dilution rate, CO flow rate, or agitation speed. Despite oscillations in cell density, the cultures reached steady states at all operating conditions. As the dilution rate increased from 0.1 to 0.3 h−1, specific activity of H2 production (SAHP) and volumetric cell production rate were linearly increased. Also, the SAHP remained almost constant at the fixed dilution rate of 0.3 h−1 even though the CO transfer rate was changed by adjusting the CO flow rate or the agitation speed. This relationship could be expressed as a typical Luedeking-Piret model, implying that high cell density culture with a sufficient growth rate is essential to obtain higher H2 productivity. On the other hand, more elevated CO transfer at the same dilution rate improved H2 production rate (HPR) by the increase of the cell density, not in the rise of SAHP. Through the continuous culture, 108 mmol/g-cell/h and 121 mmol/L/h of SAHP and HPR, respectively, could be achieved at a dilution rate of 0.3 h−1 with CO supply rate of 0.07 vvm and agitation speed of 700 rpm. Considering high H2 production activity and long-term stability of the strain over 1,000 h, MC01 is confirmed to have an outstanding potential for CO-dependent H2 production.
- Subjects :
- 0106 biological sciences
0303 health sciences
Biomedical Engineering
Analytical chemistry
Bioengineering
01 natural sciences
Applied Microbiology and Biotechnology
Volumetric flow rate
Dilution
03 medical and health sciences
chemistry.chemical_compound
chemistry
010608 biotechnology
Specific activity
Biohydrogen
Growth rate
Industrial and production engineering
030304 developmental biology
Biotechnology
Carbon monoxide
Hydrogen production
Subjects
Details
- ISSN :
- 19763816 and 12268372
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Biotechnology and Bioprocess Engineering
- Accession number :
- edsair.doi...........2d9d9fa1a4c4e0551c7c05ff8d909617
- Full Text :
- https://doi.org/10.1007/s12257-020-0005-x