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US 8,772,015 B2Granted
Biofilter media to remove odour causing compounds from waste gas streams
AssigneeBiorem Technologies Inc.
InventorsHidayat Husain, Brian P. Herner
Life of this patent
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Abstract
A biofilter media has one or more of a set of desired physical characteristics. The set of physical characteristics includes a sphericity of 0.75 to 1, a particle size of 1 to 16 or 4 to 8 mm, a uniformity coefficient of 2 or less and a surface area of 800 to 2000 m2/m3 of media. The media is coated, supports microorganisms and is used to treat a waste gas stream.
Claims13
A process for removing contaminants from a gas stream, the process comprising,
- a) providing a biofilter having a medium, the medium comprising granules, wherein each granule comprises a core and a coating, wherein the granules or their cores have a sphericity of 0.75 to 1, a particle size of 1 to 16 mm and a uniformity coefficient of between 1 and 2, wherein the biofilter further comprises microorganisms;
- and,
- b) flowing the gas stream through the biofilter at a rate providing an empty bed residence time (EBRT) of 15 seconds or less,
- wherein the contaminants comprise hydrogen sulfide, a volatile organic compound or a reduced sulfur compound, and
- wherein the coating includes one or more of a bonding agent, an adsorptive agent, and nutrients for the microorganisms.
2 more elements
A process for removing contaminants from a gas stream, the process comprising,
- a) providing a biofilter having a medium, the medium comprising granules, wherein each granule compromises a core and a coating, wherein the granules or their cores have a sphericity of 0.75 to 1, a uniformity coefficient of between 1 and 1.5 and a particle size of 1 to 16 mm, wherein the biofilter further comprises microorganisms;
- and,
- b) flowing the gas stream through the biofilter at a rate providing an empty bed residence time (EBRT) of 20 seconds or less,
- wherein the contaminants comprise hydrogen sulfide, a volatile organic compound or a reduced sulfur compound;
- and
- wherein 80% or more of the granules or their cores are of a size that would be retained between square grid sieves having openings differing in width by 4 mm or less.
3 more elements
Dependencies are inferred from the claim text.