A sorption-filtration material for recovery of radioactive iodine from gaseous aerosol exhausts

The efficiency of radioactive iodine recovery was studied as influenced by the type of filtration material and sorbent (OU-A carbon), sorbent surface density, and type and concentration of impregnating agent (AgNO₃, TEA, KI, BaI₂, etc.). A regression equation adequately describing the correlation dependence of ¹³¹I break through the sorption-filtration material on the sorbent surface density (OU-A carbon, 50–200 g m^–2) and impregnating agent concentration (AgNO₃ and TEA, 1–25 wt %) was obtained. The dynamic capacity of impregnated OU-A carbon for molecular iodine was determined; it varies from 170 to 350 mg g^–1. Based on these experimental results, a heat-resistant sorption-filtration material (Filosorb-D) for recovery of radioactive iodine was developed; this material consists of one or two layers of filtration material (FPA, PP-PE) containing imbedded impregnated OU-A carbon (100–500 g m^–2) and one layer of FSB-75-11 or MVFE-22 filtration material to remove aerosols. The operation properties of the Filosorb-D sorption-filtration material are as follows: filtration velocity up to 6 cm s^–1, aerodynamic resistance 480 Pa, efficiency of radioactive iodine recovery 99.0–99.9%, operation life 10 000–15 000 h, and desorption of radioactive iodine and sorbent carry-away < 1–2%.Translated from Radiokhimiya, Vol. 46, No. 6, 2004, pp. 559–563.Original Russian Text Copyright © 2004 by Kornienko, Ampelogova, Krupennikova.