(FR2711922-A1)       A gaseous effluent contg. organic impurities, H2 S and NH3, is purified and bio-deodorised by (a) passing the effluent, at at least 400 m/h, through a bed of inert inorganic granulate opt. a zeolite, supporting a biomass formed by mainly autrophic bacteria able to degrade the impurities, (b) wetting the bed with a liq. and (c) recovering the purified and deodorised gaseous effluent at the outlet from the bed. All the nutrients needed by the biomass are carried by the wetting liq. and/or gaseous effluent. The system of the granulate and the biomass allows of the simultaneous degradation of the impurities physico-chemically and biologically.    ADVANTAGE -   Highly charged gaseous effluents can be treated even with large, frequent alterations in the degree of pollution.    (EP650758-B1)      A gaseous effluent contg. organic impurities, H2S and NH3, is purified and bio-deodorised by (a) passing the effluent, at at least 400 m/h, through a bed of inert inorganic granulate opt. a zeolite, supporting a biomass formed by mainly autrophic bacteria able to degrade the impurities, (b) wetting the bed with a liq. and (c) recovering the purified and deodorised gaseous effluent at the outlet from the bed. All the nutrients needed by the biomass are carried by the wetting liq. and/or gaseous effluent. The system of the granulate and the biomass allows of the simultaneous degradation of the impurities physico-chemically and biologically.    ADVANTAGE -   Highly charged gaseous effluents can be treated even with large, frequent alterations in the degree of pollution.    (US5858768-A)      A gaseous effluent contg. organic impurities, H2S and NH3, is purified and bio-deodorised by (a) passing the effluent, at at least 400 m/h, through a bed of inert inorganic granulate opt. a zeolite, supporting a biomass formed by mainly autrophic bacteria able to degrade the impurities, (b) wetting the bed with a liq. and (c) recovering the purified and deodorised gaseous effluent at the outlet from the bed. All the nutrients needed by the biomass are carried by the wetting liq. and/or gaseous effluent. The system of the granulate and the biomass allows of the simultaneous degradation of the impurities physico-chemically and biologically.    ADVANTAGE -   Highly charged gaseous effluents can be treated even with large, frequent alterations in the degree of pollution.