Method of volume-decreasing radioactive liquid wastes

Purpose: To recover suspended iron particles in radioactive liquid wastes and decrease the volume of the wastes, by capturing the suspended iron of small particle size with disposal type hydrophilic cartridges and subjecting the cartridges to burning treatment. Method: Filter materials comprising hydrophilic and burnable cotton and cellulose members, or those prepared by coating them with colloids resulting positive zeta potential in water are used as the cartridge filters. For the separation of suspended iron from the system, a depth type filter is used and a plates type filter is disposed as a post filter. As a result, suspension comprising fine particles of less than 1 μ can efficiently be separated to provide the surface potential adsorption effect in addition to the mechanical sieving effect. Furthermore, since a great amount of suspension iron can be held in the filter materials, instead of making them into concentrated liquid, evaporation step or the like is unnecessary. (Moriyama, K.)