Abstract: A method for purifying a gaseous hydride, which comprises bringing a crude gaseous hydride into contact with at least one material selected from copper arsenides, copper phosphides, copper silicides, copper selenides, copper borides or copper sulfides to remove oxygen contained in the crude gaseous hydride.

Abstract: The invention refers to a process, a filter, as well as a device for the elimination of bacteria and/or viruses and/or fungi and/or spores and/or germs and/or allergens and/or pollutants and/or odors, etc from the breathing air by means of a filter consisting of one or several chemisorption mass layers. In order to avoid that biofilters which have been in operation for a longer time do not release fungi spores and bacteria under certain circumstances, the invention proposes that downstream of a biofilter, bulk material is used alternately as very strongly alkaline or very strongly acid chemisorption layers, or vice versa. As bulk material for the individual chemisorption mass layers coal coke of the type III or IV of crushed coke is used, with strongly alkaline and strongly acid chemisorption layers.

Abstract: After aerating sewage sludge in a composting process, a stream of process air is treated to remove odors therefrom by injecting into the airstream an atomized mixture of dilute sulfuric acid and dilute surfactant to remove ammonia and odorous organic compounds therefrom. The airstream is then oxidized with bleach to remove sulfides and treated with a hydrogen peroxide solution to remove chlorine introduced by the bleach while maintaining the oxidation reaction. A dilution fan is used to further dilute the scrubbed airstream as the airstream is exhausted to the atmosphere.

Abstract: A method for purifying a gaseous hydride, which comprises bringing a crude gaseous hydride into contact with at least one material from nickel arsenides, nickel phosphides, nickel silicides, nickel selenides, or nickel borides to remove oxygen contained in the crude gaseous hydride.