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Development of reactor configurations for an electrofuels platform utilizing genetically modified iron oxidizing bacteria for the reduction of CO2 to biochemicals
- Source :
- Journal of Biotechnology. 245:21-27
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Electrofuels processes are potentially promising platforms for biochemical production from CO2 using renewable energy. When coupled to solar panels, this approach could avoid the inefficiencies of photosynthesis and there is no competition with food agriculture. In addition, these systems could potentially be used to store intermittent or stranded electricity generated from other renewable sources. Here we develop reactor configurations for continuous electrofuels processes to convert electricity and CO2 to isobutyric acid (IBA) using genetically modified (GM) chemolithoautotrophic Acidithiobacillus ferrooxidans. These cells oxidize ferrous iron which can be electrochemically reduced. During two weeks of cultivation on ferrous iron, stable cell growth and continuous IBA production from CO2 were achieved in a process where media was circulated between electrochemical and biochemical rectors. An alternative process with an additional electrochemical cell for accelerated ferrous production was developed, and this system achieved an almost three-fold increase in steady state cell densities, and an almost 4-fold increase in the ferrous iron oxidation rate. Combined, this led to an almost 8-fold increase in the steady state volumetric productivity of IBA up to 0.063±0.012mg/L/h, without a decline in energy efficiency from previous work. Continued development of reactor configurations which can increase the delivery of energy to the genetically modified cells will be required to increase product titers and volumetric productivities.
- Subjects :
- 0301 basic medicine
Chemistry
business.industry
Bioengineering
02 engineering and technology
General Medicine
021001 nanoscience & nanotechnology
Electrochemistry
Pulp and paper industry
Applied Microbiology and Biotechnology
Ferrous Compounds
Ferrous
Electrochemical cell
Renewable energy
03 medical and health sciences
030104 developmental biology
Iron bacteria
Biochemistry
Bioreactor
Steady state (chemistry)
0210 nano-technology
business
Biotechnology
Subjects
Details
- ISSN :
- 01681656
- Volume :
- 245
- Database :
- OpenAIRE
- Journal :
- Journal of Biotechnology
- Accession number :
- edsair.doi...........9de8943e7eab95aa756f986cecc55fce