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US 9,850,503 B2Granted
Control of conductivity in anaerobic fermentation
OwnerRyan H. Senaratne, Peter Simpson Bell +2inventors
InventorsRyan H. Senaratne, Peter Simpson Bell, Song Liu, Syrona R. Scott
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Abstract
Process are provided which are effective for controlling medium conductivity during fermentation of a CO-containing gaseous substrate while providing an STY of about 10 g ethanol/(L·day) or more. The process includes balancing medium conductivity, specific carbon uptake or cell density levels.
Claims5
A process for fermenting a CO-containing gaseous substrate to produce ethanol comprising:
- providing a CO-containing gaseous substrate to a fermentation medium;
- contacting the resultant CO-containing fermentation medium with one or more acetogenic bacteria;
- determining a specific carbon uptake of the CO-containing gaseous substrate by the one or more acetogenic bacteria in the CO-containing fermentation medium and measuring the CO-containing fermentation medium conductivity;
- providing the CO-containing gaseous substrate to the CO-containing fermentation medium comprising the one or more acetogenic bacteria in an amount effective for maintaining a conductivity of 4 to 30 mS/cm and where the SCU of the one or more acetogenic bacteria is 0.0001 to 3, wherein SCU is the rate of specific carbon uptake by the one or more acetogenic bacteria in the CO-containing fermentation medium, measured as mmole/minute/gram dry cells.
1 more element
Dependencies are inferred from the claim text.