Radioactive wastewater treatment using selective ion exchangers

摘要

It is well known that in the Hungarian PWR-type nuclearpower plant Paks the radioactive waste waters are collectedin common tanks. These water streams contain radioactiveisotopes in ultra-low concentration and inactive compoundsas major components (borate 1.7 g/dm3, sodium-nitrate 0.4g/dm3, sodium-hydroxide 0.16 g/dm3, and oxalate 0.25 g/dm3).These low salinity solutions were evaporated by adding sodium-hydroxide, until 400 g/dm3 salt content is reached. There isabout 6000 m3 concentrated evaporator bottom residues in thetanks of the PWR. We have developed a complex technology forthe selective separation of the long live radionuclides and forthe partial recycle of boric acid from this evaporator bottomresidue.