Abstract: The object of the present invention is a method and an apparatus for underwater decomposition of organic content of aqueous waste solutions, involving the measurement and, if necessary, adjustment of the pH and electric conductivity of the solution, maintaining optimum pH and/or electric conductivity during the process, and further involving the partial or total decomposition of organic materials contained by the solution. The apparatus comprises a feed tank, at least one decomposition loop, and a storage tank. The method according to the invention is characterized by submerging electrodes in the solution, producing and maintaining an electric arc between the electrodes and the electrically conductive the solution, where the arc is produced by an electric current of at least 0.

Abstract: The object of the present invention is a method for underwater decomposition of organic content of aqueous waste solutions, involving the measurement and, if necessary, adjustment of the pH and electric conductivity of the solution, maintaining optimum pH and/or electric conductivity during the process, and further involving the partial or total decomposition of organic materials contained by the solution. A further object of the invention is an apparatus for underwater decomposition of organic content of electrically conductive aqueous waste solutions, comprising a feed tank, at least one decomposition loop, and a storage tank.

Abstract: A complex separation process and apparatus for decreasing non-radioactive salt content of waste solutions of nuclear power stations. The process significantly decreases in non-radioactive salt-content of waste solutions arising from nuclear power stations.Process is essentially based upon a suitable combination of up-to-date separating operations, such as precipitation, filtration, ultra-filtration, reverse osmosis, ion-exchange, evaporation and crystallization. Practically total amount of components carrying radioactivity (except tritium) can be effectively separated from the non-radioactive salts. Part of inactive salts (alkali nitrates) can be handled as industrial waste and the other part (boric acid) can be recycled. In the process precipitation, ion-exchange, reverse osmosis and crystallization are operations completing or replacing each other. Reverse osmosis is used not only for separating water and soluble, but for the separation of solved components.