Biofilter for removal of nitrogen oxides from contaminated gases

Details Biofilter for removal of nitrogen oxides from contaminated gases Biofilter for removal of nitrogen oxides from contaminated gases

1996-09-30

1998-08-18

Lankford, Jr., Leon B.

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing element or inorganic compound except carbon dioxide

435170, 4352625, 435266, 55220, C12P 300, C12P 104, A61L 901

Patent

active

057957517

ABSTRACT:
A biofilter for reducing concentrations of gaseous nitrogen oxides in a polluted gas comprises a porous organic filter bed medium disposed in a housing, the filter bed medium including a mixed culture of naturally occurring denitrifying bacteria for converting the nitrogen oxides to nitrogen gas, carbon dioxide, and water. A method of reducing concentrations of nitrogen oxides in polluted gas comprises conducting the polluted gas through the biofilter so that the denitrifying bacteria can degrade the nitrogen oxides. A preferred filter medium is wood compost, however composts of other organic materials are functional. Regulation of pH, moisture content, exogenous carbon sources, and temperature are described.

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patent: 5409834 (1995-04-01), Birowell
Apel, W. A., et al, The Use of Denitrifying Bacteria for the Removal of Nitrogen Oxides from Combustion Gases, Fuel vol. 72, pp. 1715-1718 (1993).
Ye, R. W., et al, Denitrification Production: and Consumption of Nitric Oxide, Applied and Environmental Microbiology, vol. 60, No. 4, pp. 1053-1058 (1994).
Wood, S. C., Select the Right NO.sub.x Control Technology, Chemical Engineering Progress, pp. 32-38, (Jan. 1994).
Cho, S. M., Properly Apply Selective Catalytic Reduction for NO.sub.x Removal, Chemical Engineering Progress, pp. 39-45 (Jan. 1994).
Garg, A., Specify Bettery Low-NO.sub.x Burner for Furnaces, Chemical Engineering Progress, pp. 46-49, (Jan. 1994).

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