Biofiltration of nitric oxide
Conference
·
OSTI ID:351120
- Univ. of California, Davis, CA (United States). Dept. of Civil and Environmental Engineering
Results of recent experiments on nitrogen transformations in biofilters suggest that oxides of nitrogen may be both oxidized or reduced within these systems. Under the proper conditions, nitric oxide (+2) can be reduced to molecular nitrogen (0) through microbial denitrification, or nitric oxide can be sequentially oxidized to nitrite (+3) and then to nitrate (+5) through microbial nitrification. There are major implications of these findings for the use of biofilters as air pollution control devices since economical NO{sub x} control technologies may be possible and should be exploited. Oxidation of ammonia ({minus}3) to nitrite (+3) by bacteria of the genus Nitrosomonas and oxidation of nitrite (+3) to nitrate (+5) by bacteria of the genus Nitrobacter are ubiquitous reactions in soil and natural waters. The intermediates, nitrous oxide (+1) and nitric oxide (+2) are potentially oxidizable by nitrifying bacteria in the presence of atmospheric concentration of oxygen. The oxidation of nitric oxide within a biofilter was demonstrated. The authors have observed removal up to 70% in laboratory scale aerobic biofilters with a NO feed of 80 ppmv and an empty bed contact time of 12 minutes. Nitric oxide removal appears to be linear with nitric oxide concentration. Removal rates are a function of the flow rate of the gas, suggesting diffusion limitations. The biofilter system was sensitive to pH changes resulting from nitrification. Improved removal efficiency at shorter contact times may be possible with increased biomass and better distribution.
- OSTI ID:
- 351120
- Report Number(s):
- CONF-970677--
- Country of Publication:
- United States
- Language:
- English
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