Biofiltration is a promising technology for reducing odor and gas emissions from livestock operations. Two important operating parameters in biofiltration - media moisture content (MC), and gas retention time (RT) - were studied to determine their effects on sulfur (S) and nitrogen (N) balances. Laboratory experiments were carried out to determine S and N accumulation in and emissions from biofilters with various media MC (30%, 40%, 50% wb) and RT (5, 10, 20 s). The biofilter media was a mixture of compost and wood chips. The media bed was 0.20 m deep and 0.30 m in diameter Two trials (replications) were run. Results showed that 47% to 94% of the hydrogen sulfide (H2S) and 25% to 90% of the ammonia (NH3) were removed by the biofilters. Removal efficiency varied with treatment. Biofilters with 50% MC and 20 s RT had the largest removal efficiencies for both H2S and NH3, with average H2S removal rates of 92.8% in Trial 1 and 94.2% in Trial 2. Average NH3 removal efficiencies of these biofilters (50% MC and 20 s RT) were 90.3% in Trial 1 and 75.8% in Trial 2. S and N accumulation in the biofilter media was also affected by MC and RT. Accumulation models for S and N in the media were developed and reported.
|Original language||English (US)|
|Number of pages||15|
|Journal||Transactions of the American Society of Agricultural Engineers|
|State||Published - Dec 1 2000|