Recycling processing method for radioactive liquid waste containing sodium nitrate

Nitric acid is recovered by reacting sulfuric acid to low and medium level radioactive liquid wastes containing Na nitrate in a glass-lined reaction vessel and by heating under reduced pressure. Sodium hydrogen sulfate Na as a reaction product is neutralized into Na sulfate and then electrolyzed, and resultant Na hydroxide is recovered. On the other hand, sulfuric acid is recycled so as to be used again for the reaction with radioactive liquid wastes containing Na nitrate, and residual liquid of electrolysis is recycled and electrolyzed. Then, miscellaneous materials accumulated in the system are separated and removed by a chelate resin method. With such procedures, nitric acid can be recovered with no influences on anodic corrosion in an electrolysis bath, thereby enabling to prolong the life time of the equipments and improve process reliability. (T.M.)