Abstract: A method of concentrating and drying water-containing fluent media, especially waste water concentrates, wherein an additive is incorporated in the water-containing fluent media for separating the solids thereof without the formation of scale and the liquid is evaporated. The additive comprises precipitates containing hydroxides, phosphates or arsenates of magnesium, calcium, zinc, aluminum or iron.

Abstract: An improved heat treatment for spent ion exchange resins containing radioive inorganic compounds is described for converting the resin into a form which can be safely stored, either directly or embedded in concrete or bituminous. The resin is heated, in the presence of an inert gas such as nitrogen or a reducing gas such as carbon monoxide, to a temperature sufficient to effect a carbonization of the resin but too low to cause the radioactive compounds in the resin to evaporate or sublimate. The resulting low-temperature carbonization of the resin effectively fixes the non-volatile compound to the resin, and prevents a later radiolytic decomposition of such compounds during storage.

Abstract: A thin film treatment apparatus, especially a thin film evaporator, comprising a rotor having a shaft and a rotationally symmetrical wall arranged about said rotor. The rotor is equipped with essentially radial, elastically resilient scraper elements extending up to such wall. These scraper elements are of essentially blade-shaped construction, and these scraper elements and the rotor are at least partially covered with an elastomeric material.

Abstract: There is disclosed a process for the production of solid particles of bioinjurious waste, e.g., radioactive concentrates, wherein a liquid, and in a given case a binder containing waste is divided into drops and supplied energy in a gaseous medium, the liquid is evaporated and the drops form solid particles. There is supplied carrier free energy to at least partially vaporize the liquid of the drops, in a given case under reduced pressure and in a given case with a binder forming solid particles from the drops.

Abstract: Solid radioactive or toxic wastes are prepared for long-term storage by adding a hardenable binding agent to a container filled with the waste under a partial vacuum. The improved homogeneity of mixing of the binder and waste is enhanced by removing the partial vacuum prior to the hardening of the binder. The temperature of the container is maintained, during the addition of the binder agent to the waste, at a temperature at least equal to the melting temperature of the binder to assure thorough impregnation of the waste thereby. Preferably, the container supporting the resultant waste-binder matrix is placed in a larger container, and the space between the two containers is filled with bituminous material or concrete to provide added security against water penetration during storage.

Abstract: A method for the production of spherical particles. The starting material for the particles and organic substances are used to form a liquid aqueous mix from which drops are formed. The starting material is introduced into an aqueous solution in the form of a fine powder. The solution contains condensable or curable organic substances. As the starting material a non-metal, metalloid or a compound of one of these is used.