Microbial reduction of SO{sub 2} and NO{sub x} as a means of by- product recovery/disposal from regenerable processes for the desulfurization of flue gas. Technical progress report, June 11, 1992--September 11, 1992
Based on the work described simultaneous SO{sub 2}/No{sub x} removal from flue gas based on direct contact of the gas with SRB and T. denitrificans co-cultures or cultures-in-series has been eliminated as a viable process concept at this time. The technical reasons are as follows: (1) NO inhibition of SO{sub 2} reduction by D. desulfuricans - Although the NO concentrations used in the experiments described above are somewhat higher than that found in a typical flue gas, it is quite possible that at lower NO concentrations (or partial pressures) the inhibiting effects will simply take longer to become apparent. (2) Nitrate suppression of NO removal - As noted previously, the cultivation of T. denitrificans in a microbial flue gas treatment system (either one or two stages) would require sulfide-limiting conditions. Therefore, the electron acceptor must be in excess, requiring nitrate in the T. denitrificans process culture. As shown in experiments described above, nitrate significantly suppresses the removal of NO from a feed gas making simultaneous SO{sub 2}/NO{sub x} removal impractical by microbial means. (3) O{sub 2} inhibition of SO{sub 2} and NO reduction - It has been demonstrated that D. desulfuricans working cultures are tolerant of up to 1.7% O{sub 2} in the feed gas. However, further increases in the O{sub 2} partial pressure in the feed gas resulted in O{sub 2} inhibition of SO{sub 2} reduction. These inhibiting levels of O{sub 2} are comparable to those concentrations found in flue gases (3). Therefore, in any process in which raw flue gas contacts a D. desulfuricans culture marginal stability at best can be expected.
- Research Organization:
- Tulsa Univ., OK (United States). Center for Environmental Research and Technology
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90096
- OSTI ID:
- 10109692
- Report Number(s):
- DOE/PC/90096-T4; ON: DE93006002
- Resource Relation:
- Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microbial reduction of SO{sub 2} and NO{sub x} as a means of by-product recovery/disposal from regenerable processes for the desulfurization of flue gas. Technical progress report, September 11, 1992--December 11, 1992
Microbial reduction of SO sub 2 and NO sub x as a means of by-product recovery/disposal from regenerable processes for the desulfurization of flue gas
Related Subjects
01 COAL, LIGNITE, AND PEAT
59 BASIC BIOLOGICAL SCIENCES
FLUE GAS
DESULFURIZATION
DENITRIFICATION
FEASIBILITY STUDIES
DESULFOVIBRIO
CULTURE MEDIA
SULFUR DIOXIDE
BIOCONVERSION
NITROUS OXIDE
THIOBACILLUS FERROXIDANS
PROGRESS REPORT
BIOTECHNOLOGY
FOSSIL-FUEL POWER PLANTS
BIOREACTORS
SULFATE-REDUCING BACTERIA
MOLASSES
SEWAGE
200202
014000
550700
NOXIOUS GAS AND PARTICULATE EMISSIONS
COMBUSTION
MICROBIOLOGY