Abstract: In a process for removing hydrogen sulfide from an oxygen-containing gas stream by passing the gas stream through caustic-impreganted activated carbon, the stream containing from about 5 ppm to about 10,000 ppm by volume of hydrogen sulfide, improvement in which the breakthrough capacity of the caustic-impregnated activated carbon for hydrogen sulfide is extended by the addition of ammonia to the air stream at or about the time that the aforementioned breakthrough capacity has been reached or exceeded, the amount of added ammonia being such that its concentration is at least equal to the concentration of hydrogen sulfide but preferably not greater than about 50 ppm by volume.

Abstract: In a process for removing amines having normal boiling points under 100.degree. C., present in an oxygen-containing gas, which comprises passing the amine-containing gas through activated carbon and releasing the gas into the atmosphere, said gas containing from about 5 ppm by volume to about 5,000 ppm by volume of amines, the improvement which comprises adding about 500 ppm to about 30,000 ppm by volume of gaseous carbon dioxide to said gas prior to passing the gas through the activated carbon.

Abstract: In a process for removing hydrogen sulfide from an oxygen-containing gas stream by passing said gas stream through activated carbon, said stream containing from about 5 ppm to about 10,000 ppm by volume, which comprises adding ammonia to said stream prior to its passage through the carbon, improvement in which the amount of added ammonia is such that its concentration will be at least equal to the concentration of the hydrogen sulfide and not greater than 10,000 ppm with the proviso that when the concentration of hydrogen sulfide exceeds 4,000 ppm by volume, the concentration of the ammonia will not be greater than 6,000 ppm by volume.

Abstract: An improved catalytic process for the ozonation of water containing organic contaminants is disclosed. In this process the water, which may be either waste water or potable water, containing organic contaminants is contacted with ozone, preferably at a pH in the range of about 6.8 to about 7.8 (controlled by buffering if necessary), in the presence of a mixed heterogeneous catalyst comprising water insoluble salts, preferably an insoluble carbonate, sulfate, oxide, halide or sulfide, of at least two metals selected from the group consisting of copper, cadmium and the group VIII metals, preferably iron, cobalt or nickel although other group VIII metals such as platinum or Palladium may be used if desired.