(JP10500351-W)      Sparingly soluble gaseous substances (II) are removed from a gas (I) by contacting with microorganisms capable of degrading (II); (I) is led into a suspension of the microorganisms to form small bubbles in the suspension; the microorganisms degrade (II) on the surface of the bubbles. The gas which rises to the surface of the suspension may be directed to another similar or different biodegradation stage. Also claimed is an appts. for removing (II) from (I), comprising a microorganism suspension chamber (16) having below its liq. filling level (22) a feed pipe (24) for (I), as well as bioreactor (12) in direct contact with the chamber; the bioreactor(s) contain filler or packing comprising immobilised microorganisms capable of degrading (II). Further claimed is an isolated and purified microorganism culture capable of degrading (II) in a suspension, designated Thiobacillus sp. T330 DSM 8985, which is capable of degrading carbon disulphide and hydrogen sulphide in (I).    USE -   (I) is an industrial or agricultural waste gas, and (II) consists of noxious and generally toxic contaminants, e.g. CS2, H2S, (CH3)2S, mercaptan, styrene and/or toluene.    (US5747331-A)      Sparingly soluble gaseous substances (II) are removed from a gas (I) by contacting with microorganisms capable of degrading (II); (I) is led into a suspension of the microorganisms to form small bubbles in the suspension; the microorganisms degrade (II) on the surface of the bubbles. The gas which rises to the surface of the suspension may be directed to another similar or different biodegradation stage. Also claimed is an appts. for removing (II) from (I), comprising a microorganism suspension chamber (16) having below its liq. filling level (22) a feed pipe (24) for (I), as well as bioreactor (12) in direct contact with the chamber; the bioreactor(s) contain filler or packing comprising immobilised microorganisms capable of degrading (II). Further claimed is an isolated and purified microorganism culture capable of degrading (II) in a suspension, designated Thiobacillus sp. T330 DSM 8985, which is capable of degrading carbon disulphide and hydrogen sulphide in (I).    USE -   (I) is an industrial or agricultural waste gas, and (II) consists of noxious and generally toxic contaminants, e.g. CS2, H2S, (CH3)2S, mercaptan, styrene and/or toluene.