Reduction of nitric oxide to elemental nitrogen byThiobacillus Denitrificans

Lee, Kuoh H.; Sublette, Kerry L.

doi:10.1007/bf02920268

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…Up to 96% removal of NO was observed with Thiobacillus denitrificans for a gas stream containing 5000 ppm of NO. However, simultaneous SO 2 /NO x removal from flue gas was not technically feasible by a combined system with Desulfovibrio desulfuricans and T. denitrificans due to the NO inhibition to D. desulfuricans ( , ). The presence of 3−8% oxygen in the flue gases of utility boilers adversely affected the anoxic denitrification process, whereas the nitrification process needed a very high empty bed contact time (EBRT) on the order of 10−14 min.…”

Section: Introductionmentioning

confidence: 99%

Integrated System for the Treatment of Oxides of Nitrogen from Flue Gases

Barman

Philip

2005

Environ. Sci. Technol.

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A novel and effective system was developed for the complete treatment of NOx from flue gases. The system consisted of photocatalytic or ozone oxidation of NOx, followed by scrubbing and biological denitrification. Maximum photocatalytic oxidation of NOx was achieved while using powdered TiO2 at a catalytic loading rate of 10 g/h, relative humidity of 50%, and a space time of 10 s. The used catalyst was regenerated and reused. A total of 72% of oxidized NO was recovered as HNO3/HNO2 in the regeneration process. Stoichiometrically, 10% excess ozone was able to affect 100% oxidation of NO to NO2. Presence of SO2 adversely influenced the oxidation of NO by ozone. The scrubbing of NO was effective with distilled water. Heterotrophic denitrifiers were able to denitrify the leachate with an efficiency of 90%, using sewage (COD 450 mg/L) as electron donor. The new integrated treatment system seems to be a promising alternative for complete treatment of NOx from flue gases.

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Section: Introductionmentioning

confidence: 99%

Integrated System for the Treatment of Oxides of Nitrogen from Flue Gases

Barman

Philip

2005

Environ. Sci. Technol.

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“…Thiobacillus denitrificans , a strict autotroph and facultative anaerobe, may be cultured anaerobically in aqueous phase batch reactors using NO as a terminal electron acceptor. Thiosulfate can serve as an energy source, CO 2 as a carbon source, and ammonium ions as a source of reduced nitrogen 45. Up to 96% removal was observed with Thiobacillus denitrificans for a gas stream containing 5000 ppm NO.…”

Section: Recent Biological Technologies For Nox Removalmentioning

confidence: 98%

Bioprocesses for the removal of nitrogen oxides from polluted air

Yao

Veiga

Kennes

2005

J of Chemical Tech & Biotech

135

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Nitrogen oxides (NOx) of environmental concern are nitrogen monoxide (NO) and nitrogen dioxide (NO 2 ). They are hazardous air pollutants that lead to the formation of acid rain and tropospheric ozone. Both pollutants are usually present simultaneously and are, therefore, called NOx. Another compound is N 2 O which is found in the stratosphere where it plays a role in the greenhouse effect. Concern for environmental and health issues coupled with stringent NOx emission standards generates a need for the development of efficient low-cost NOx abatement technologies. Under such circumstances, it becomes mandatory for each NOx-emitting industry or facility to opt for proper NOx control measures. Several techniques are available to control NOx emissions: selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), adsorption, scrubbing, and biological methods. Each process offers specific advantages and limitations. Since bioprocesses present many advantages over conventional technologies for flue gas cleaning, a lot of interest has recently been shown for these processes. This article reviews the major characteristics of conventional non-biological technologies and recent advances in the biological removal of NOx from flue gases based on the catalytic activity of either eucaryotes or procaryotes, ie nitrification, denitrification, the use of microalgae, and a combined physicochemical and biological process (BioDeNOx). Relatively uncomplicated design and simple operation and maintenance requirements make biological removal a good option for the control of NOx emissions in stationary sources.

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“…The beads were stable and active for 3 months in a continuous flow system. Lee and Sublette (1990) evidenced that T. denitrificans can also remove gaseous nitrogen compounds, such as NO in the presence of thiosulfate and carbon dioxide. They demonstrated that NO can act as an electron acceptor for this bacterium.…”

Section: Addition Of Soluble Sulfur Sourcesmentioning

confidence: 99%

Interactions of the sulfur and nitrogen cycles: microbiology and process technology

Chazal¹,

Lens²

2020

Environmental Technologies to Treat Sulphur Pollution: Principles and Engineering

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Microorganisms play a key role in the biogeochemical cycling of numerous elements. This is particularly the case for the elements of living biomass such as carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus. When studying these cycles, the interactions between the different elements are of utmost importance. This chapter describes the interactions between the sulfur and nitrogen cycles, with particular attention paid to processes allowing nitrogen removal from polluted environments using sulfur cycle conversions. 13.1.1 The nitrogen cycle The nitrogen cycle largely depends on microbial activities (Figure 13.1). Gaseous N 2 from the air is reduced in soil or water to ammonium by bacterial nitrogen fixationstep (1) in Figure 13.1. These bacteria possess the Nif genes that code for a specialized enzyme, nitrogenase, which catalyzes this N 2 reduction under well-defined conditions. In soil, it is present in free-living microorganisms such as Azotobacter sp. and Klebsiella sp. or in symbiotic bacteria such as Rhizobium sp. growing in association with plants. Nitrogen fixation also occurs in aquatic habitats by Cyanobacteria. Ammonium thus formed is incorporated into organic

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Reduction of nitric oxide to elemental nitrogen byThiobacillus Denitrificans

Cited by 10 publications

References 2 publications

Integrated System for the Treatment of Oxides of Nitrogen from Flue Gases

Integrated System for the Treatment of Oxides of Nitrogen from Flue Gases

Bioprocesses for the removal of nitrogen oxides from polluted air

Interactions of the sulfur and nitrogen cycles: microbiology and process technology

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