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 Report · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/6595741· OSTI ID:6595741

Sublette, K L

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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90096
• OSTI ID: 6595741
• Report Number(s): DOE/PC/90096-T4; ON: DE93006002
• Country of Publication: United States
• Language: English

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59 BASIC BIOLOGICAL SCIENCES
BACILLUS
BACTERIA
BIOCONVERSION
BIOREACTORS
BIOTECHNOLOGY
CHALCOGENIDES
CHEMICAL REACTIONS
CULTURE MEDIA
DENITRIFICATION
DESULFOVIBRIO
DESULFURIZATION
DOCUMENT TYPES
FEASIBILITY STUDIES
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
MICROORGANISMS
MOLASSES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
PROGRESS REPORT
SEWAGE
SULFATE-REDUCING BACTERIA
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFUR-OXIDIZING BACTERIA
THERMAL POWER PLANTS
THIOBACILLUS FERROXIDANS
WASTES