APPARATUS FOR CONCENTRATING WASTE LIQUID, APPARATUS FOR PROCESSING WASTE LIQUID AND METHOD OF CONCENTRATING WASTE LIQUID

摘要

This invention relates to a waste liquid concentration technique which removes water of a waste liquid therefrom at a high decontamination efficiency. The invention uses a porous film which transmits gas such as steam but not liquid such as water as a concentration film of the waste liquid. When the waste liquid is concentrated by use of this porous film, the waste liquid is brought into contact with the porous film in the form of steam flow to concentrate it. Since the waste liquid is turned to the steam flow, most of various metal ions and surfactants existing in the waste liquid are separated from the steam flow. The mist contained in the steam flow and the metal ions in the mist are removed from the steam by the porous film when the steam passes therethrough. Therefore, the waste liquid can be processed at a high decontamination efficiency and moreover, stably for an extended period. If this waste liquid concentration technique is applied to a processing apparatus for the waste liquid having high electric conductivity that is generated from a nuclear power plant, for example, various tanks, desalting devices, ion exchange resin and the like, otherwise disposed downstream of the concentrator become unnecessary and the processing system can be simplified drastically.