METHOD FOR TREATING RADIOACTIVE WASTE SOLUTION AND DEVICE FOR TREATING SAME

• Main Authors: NUMATA, MAMORU, KATO, TAKASHI, MORIMOTO, YASUTOMI, SUZUKI, YASUHIRO
• Format: Patent
• Language: English; French; German
• Published: 15.02.2012
• Subjects: CHEMISTRY; DECONTAMINATION ARRANGEMENTS THEREFOR; METALLURGY; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; SEPARATION; TRANSPORTING; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

There is provided a method for treating a radioactive liquid waste containing a sodium salt, the method comprising: a liquid waste reducing step of partially reducing sodium nitrate contained in a radioactive liquid waste to convert the radioactive liquid waste into a reduced solution containing at least one of sodium hydroxide, sodium hydrogencarbonate, and sodium carbonate; and an electrodialysis step of performing electrodialysis of the reduced solution by supplying the reduced solution to an anode chamber of an electrolytic cell, the electrolytic cell including an anode and a cathode disposed on both sides of a permeable membrane which a sodium ion selectively permeates, wherein, in the electrodialysis step, a sodium ion that has permeated the permeable membrane is separated and recovered as sodium hydroxide in a cathode chamber, a radioactive substance left in the anode chamber is separated as a radioactive substance concentrated solution, and the separated sodium hydroxide and radioactive substance concentrated solution are recovered; and a production rate of the at least one of sodium hydroxide, sodium hydrogencarbonate, and sodium carbonate in the liquid waste reducing step is equalized with a recovery rate of the sodium ion in the electrodialysis step.