Biofilter for removal of nitrogen oxides from contaminated gases under aerobic conditions
A biofilter is described 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 is described 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. 6 figs.
- Research Organization:
- EG & G Idaho Inc
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC07-76ID01570
- Assignee:
- Lockheed Martin Idaho Technologies Co., Idaho Falls, ID (United States)
- Patent Number(s):
- US 5,795,751/A/
- Application Number:
- PAN: 8-719,831
- OSTI ID:
- 672663
- Country of Publication:
- United States
- Language:
- English
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