Radioactive liquid waste processing device

Purpose: To improve the processing device for radioactive liquid wastes by applying pervaporation method. Constitution: Pervaporation is used in which specific ingredients in the liquid phase are selectively permeated to be separated and concentrated by providing the liquid phase on the high pressure side and reducing the pressure or flowing a carrier gas on the lower pressure side of membranes. In this method, there is no reduction in the amount of liquids permeated and the separation efficiency as the liquids are concentrated as in the conventional reverse osmometry. As a result, low temperature processing is possible and, there is no corrosion problem for materials as compared with the evaporization method and, thus, concentration of volatiling material such as ammonia and boric acid is made possible and the range of application uses is widened. Further, a highly concentrating operation is possible up to the solubility limit of material to be treated and energy utilization efficiency can be improved as compared with the evaporization method. While the concentration of the volatizing material is impossible in the evaporization method and concentration of boric acid is impossible in the reverse osmometry, the device can provide an excellent performance over these prior arts. (Kawakami, Y.)