Abstract: A method for purifying flue-gasses and other hot, oxidative waste gasses originating from industrial installations, combustion furnaces, engines and the like, whereby the hot gas to be purified is passed through at least one spraying chamber or -area and is contacted therein with a gas washing liquid, which is sprayed into the hot gas flow and cools the gas to below 100.degree. C., whereby residual liquids with a high C.Z.V.-value, which comprise complex builders, compounds of heavy metals, sulphur- and nitrogen compounds, and originating amongst others from fixing-baths and the like from the photographic, photochemical and galvanic industries, are used as gas washing liquid.

Abstract: A method for processing residual fixing-baths, whereby a residual fixing-bath after demetalization by means of sulfide or by means of electrolysis, is acidified with a mixture of nitric acid and sulphuric acid, and the precipitated sulphur is removed. A liquid suitable as a gas washing liquid for flue gases and/or liquid fertilizer component is also prepared by an integrated processing of two or three waste materials.

Abstract: A method for processing ash residues and other solide combustion products, derived from combustion of waste materials in furnaces whereby the ash and other combustion products are gradually supplied in a continuous manner into the high side of a glaze-kiln, showing a sloping course, which is heated from its lower side, and are fused and glazed in a continuously proceeding process at high temperatures and a glaze-kiln, useful in this method.

Abstract: A method for processing residual liquids comprising organic complexes of heavy metals, sulphur and nitrogen compounds and amongst others originating from fixing baths and the like of the photographic and photochemical industries, whereby the residual liquid is sprayed in at least one spraying chamber or area with addition of nitrates and calcium ions into a hot, oxidizing gas flow, in particular originating from industrial installations or combustion furnaces.

Abstract: A method is provided for combusting multifarious waste material. The waste to be combusted is subjected to a self maintaining pyrolysis in a long, horizontal chamber oven under oxygen depleted conditions, and is subsequently completely combusted under a supply of adequate air. A chamber oven is provided with an upper row of closable air inlet apertures at the upper side, divided over the wall length, and a lower row of closable air inlet apertures at the lower side, divided over the wall length. A larger air inlet aperture is provided in each one of the side walls in the vicinity of the oven throat, and air inlet apertures are also provided in the off-gas conduit.