Biofiltration removal of odor emitted from grit-water separator in a municipal sewage plant was studied. The height and volume of biofilter media were 1.5m and 55 m3 respectively, and the volume of odor gas to be treated was 12 000 m3·h-1. The 120d observation showed that the initial concentration of H2S and NH3 was 1.96~4.63 mg·m-3, 2.21~5.68 mg·m-3. After treatment, the concentration was reduced to 0.03~0.97 mg·m-3 for H2S and under 0.46 mg·m-3 for NH3. The removal ratio of H2S exceeded 80%, and the concentration of NH3 in outflux was better than level 1 National Standard. Odor removal strains consisted of bacteria, yeast and mould, such as Bacillus, Pseudomonas, Zoogloea, Acinetobacter, Thiobacillus, Saceharomyces, Candida, Aspergillus, Penicillium,and Rhizopus, among which bacteria was dominant and reached 1.8~3.1×108 CFU per gram dry filter media.
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