Performance evaluation of water circulating system in soil washing system for highly concentrated radiation-contaminated soil

Ishiyama, Shintaro

For the purpose of performance evaluation of new water circulating system (Amount of evaporation: 40 kg/h) in radiation contaminated soil washing process, decontamination water washing and water circulating tests for the system were conducted with over 570,000 Bq/kg radiation contamination soil in FUKUSHIMA and the following results were derived;(1) Interfusion of fission product due to dissociation from contaminated soil into filtrate was observed after filter press, and interfusion amount of FP for contaminated moor soil and village road soil reached to 35% and 0.01%, respectively. (2) Condensation water with very low contamination and impurity was produced by the water circulating machine and 86-88% recovery rate from filtrate was achieved. (3) Almost FP was concentrated in concentrated solution and concentration rate of solution reached to 7.2-8.6.