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Biofilter for removal of nitrogen oxides from contaminated gases under aerobic conditions

Patent ·
OSTI ID:871787
 [1]
  1. Idaho Falls, ID
+ Show Author Affiliations

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.

Research Organization:
EG & G IDAHO INC
DOE Contract Number:
AC07-76ID01570
Assignee:
Lockheed Martin Idaho Technologies Company (Idaho Falls, ID)
Patent Number(s):
US 5795751
OSTI ID:
871787
Country of Publication:
United States
Language:
English

References (2)

Denitrification: production and consumption of nitric oxide. journal January 1994
The use of denitrifying bacteria for the removal of nitrogen oxides from combustion gases journal December 1993

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Related Subjects

/435/
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