TREATMENT OF RADIOACTIVE WASTE LIQUID

摘要

PURPOSE:To extremely decrease the volume of the final matter to be disposed by subjecting the dry solid which is formed by heating and evaporating a radioactive waste liquid contg. a sodium compd. further to heating to decompose and remove the sodium compd. to obtain the radioactive solid residue. CONSTITUTION:A storage tank 32 in which the radioactive waste liquid 30 contg. sodium nitrate is connected to a screw feeder type microwave denitrating device 34 consisting of a microwaveguide 38 for heating and a screw 40 for stirring and transferring the object to be heated. A denitrated matter withdrawing port 44 of this device 34 is connected to a sodium oxide decomposing device 46 having a microwaveguide mounting port 54 and a discharge port 60. The denitrated matter from the device 34 is further heated by microwaves and the evaporated matter is discharged from the discharge port 60. The radioactive solid residue 58 which is not decomposed and evaporated is thereby made to remain in the bottom of a crucible 50 mounted in the lower part of the decomposing device 46.