Carbon disulfide and hydrogen sulfide removal with a peat biofilter.
Simultaneous removal of H2S and CS2 was studied with a peat biofilter inoculated with a Thiobacillus strain that oxidizes both compounds in an acidic environment. Both sulfurous gases at concentrations below 600 mg S/m3 were efficiently removed, and the removal efficiencies were similar, 99%, with an empty bed retention time (EBRT) of more than 60 sec. Concentrations greater than 1300-5000 mg S/m3 caused overloading of the filter material, resulting in high H2SO4 production, accumulation of elemental sulfur, and reduced removal efficiency. The highest sulfur removal rate achieved was 4500 g-S/day/m3 filter material. These results indicate that peat is suitable as a biofilter material for the removal of a mixture of H2S and CS2 when concentrations of gases to be purified are low (less than 600 mg/m3), but it is still odorous and toxic to the environment and humans.
Department of Environmental Sciences, University of Kuopio, Finland. tarja.hartikainen@uku.fi
T
T
Hartikainen
J
J
Ruuskanen
P J
PJ
Martikainen
D000393:Air Pollutants / Q000378:metabolism / Q000493:pharmacokinetics*; D000397:Air Pollution / Q000517:prevention & control*; D002246:Carbon Disulfide / Q000378:metabolism / Q000493:pharmacokinetics*; D005374:Filtration; D006862:Hydrogen Sulfide / Q000378:metabolism / Q000493:pharmacokinetics*; D012987:Soil; D013855:Thiobacillus / Q000502:physiology*
D000393:Air Pollutants; D012987:Soil; D002246:Carbon Disulfide; D006862:Hydrogen Sulfide