Biological removal of H2S from the livestock manure using a biofilter
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In this paper, the biological removal of H2S from air had been investigated using a self-made biofilter with efficient bioceramics and a polyhedral hollow ball. The biological removal efficiency of H2S had been analyzed at different experimental conditions, such as inlet H2S concentration, residence time, initial pH value, and reaction temperature etc. The results showed that the initial pH value had a slight effect on H2S removal efficiency from pH 3 to 9. The optimal initial pH value was 5.5, while the H2S removal efficiency was 100%. The H2S removal efficiency increased with increases in the nutrient solution spraying rate. The appropriate temperature was 25°C in the temperature range from 15 to 30°C. The H2S removal efficiency dropped with the increase of air input and inlet H2S concentration. After being isolated and screened, six strains of heterotrophic sulfide oxidizing bacteria and one strain autotrophic sulfide oxidizing bacteria were determined to be involved in the removal of H2S within the biofilter. The reaction kinetics of H2S was in accordance with first order reaction kinetics.
Keywordsremoval of H2S biofilter degradation
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