The invention relates to a method and an arrangement for operating a system in which dismantling works are performed underwater in a liquid-filled vessel (10) of a nuclear facility, the liquid being guided in a circuit (20) and flowing through at least one filter device (26, 28, 30). The liquid in the circuit flows through at least a first filter device (26) in the form of a coarse filter and a second filter device (28), in which at least one device from the group of ion exchangers (1, 2, 3), reverse osmosis systems, ultrafiltration systems, activated carbon filters, zeolite filters, and biological filters is used for filtration.

Apparatus for drying Spent Ion-Exchange Resins (SIER), which can intensify the SIER drying process, reduce power consumption, and accelerate discharge of SIER when the drying process is completed. The apparatus comprises a sealed cylindrical body, and a blow-down choke installed in an upper part of the sealed cylindrical body and a nozzle to feed the spent ion-exchange resins is installed inside the body, and a nozzle to retrieve dried ion-exchange resins is installed in its bottom part and equipped with a locking device. An external heater is provided for the body, and a drive shaft that is installed in alignment inside the body, capable of rotation, and equipped with a stirrer. A lower part of the drive shaft with lower screw winding is installed in alignment inside the nozzle to retrieve dried ion-exchange resins. The nozzle to retrieve dried ion-exchange resins is equipped with a water draining device.

Apparatus for drying Spent Ion-Exchange Resins (SIER), which can intensify the SIER drying process, reduce power consumption, and accelerate discharge of SIER when the drying process is completed. The apparatus comprises a sealed cylindrical body, and a blow-down choke installed in an upper part of the sealed cylindrical body and a nozzle to feed the spent ion-exchange resins is installed inside the body, and a nozzle to retrieve dried ion-exchange resins is installed in its bottom part and equipped with a locking device. An external heater is provided for the body, and a drive shaft that is installed in alignment inside the body, capable of rotation, and equipped with a stirrer. A lower part of the drive shaft with lower screw winding is installed in alignment inside the nozzle to retrieve dried ion-exchange resins. The nozzle to retrieve dried ion-exchange resins is equipped with a water draining device.

The present invention relates to a process for the decontamination of radioactively contaminated material comprising the steps of a) providing radioactively contaminated material in a decontamination bath (200), b) providing a reactor unit (107) comprising a first reactor chamber (102) connected to a second reactor chamber (103), c) electrolyzing water with a ph>7 in the first reactor chamber (102) and generating (H.sub.3O.sub.2).sub.n, d) generating nanobubbles in the electrolyzed water of the second reactor chamber (103), e) optionally repeating steps c) and d), f) applying pressure to the water which contains nanobubbles, g) transferring the pressurized water which contains nanobubbles to a decontamination bath (200) containing an α-ray generator and the radioactively contaminated materiel, h) charging the nanobubbles with the α-particles emitted by the α-ray generator, and i) bringing the charged nanobubbles in contact with the radioactively contaminated material in the decontamination bath (200).

An adsorbent and photocatalytic decontamination gel consisting of a colloidal solution comprising, preferably consisting of: 8% to 30% by weight, preferably 10% to 30% by weight, more preferably 15% to 20% by weight, better still 15% to 20% by weight, the value 15% being excluded, even better still 16% to 20% by weight, for example 20% by weight of TiO.sub.2, optionally doped, relative to the weight of the gel; optionally 0.01% to 10% by weight, preferably 0.1% to 5% by weight, relative to the weight of the gel, of at least one dye and/or of at least one pigment; optionally 0.1% to 2% by weight, relative to the weight of the gel, of at least one surfactant; optionally 0.05% to 5% by weight, preferably 0.05% to 2% by weight, relative to the weight of the gel, of at least one superabsorbent polymer; and the balance of solvent.

A method and apparatus for the electrochemical removal of material from a surface in which two or more fluid jets or flows are arranged to impinge on the surface of the object and an electrical current flows through one fluid flow path, through the object, and then through a second fluid flow path.

A process for recovering uranium from components contaminated with uranium oxide includes providing a cleaning apparatus with a cleaning solution for dissolving the uranium oxide of the components, carrying out a cleaning process by introducing a batch of components into the cleaning apparatus, and carrying out a measurement for determining the uranium content of the components. The cleaning and the measuring are repeated if a limit value for the uranium content is exceeded. The components are discharged from the process if the uranium content falls below a limit value. The cleaning is carried out on a plurality of successive batches of components until a control measurement indicates an unsatisfactory cleaning action of the cleaning solution. The uranium oxide dissolved in the cleaning solution is recovered after indication of the unsatisfactory cleaning action.

A method for decommissioning a nuclear facility includes: separating a nuclear reactor pressure vessel from biodegradable concrete; decommissioning a concrete structure; covering the biodegradable concrete; and decommissioning the biodegradable concrete.

The invention relates to a method for aerobic and anaerobic cultivation of microorganisms. The invention also relates to a method for producing a preparation for cleaning contaminated liquids and surfaces. Likewise, the invention relates to a method for cleaning contaminated liquids and surfaces.

The invention relates to a method for aerobic and anaerobic cultivation of microorganisms. The invention also relates to a method for producing a preparation for cleaning contaminated liquids and surfaces. Likewise, the invention relates to a method for cleaning contaminated liquids and surfaces.