PNNL

Abstract

Carboxylated poly(diaryloxy)phosphazene was examined as the active constituent of the composite membranes to seperate tritiated water (HTO) from light water. These membranes were tested with water containing 10 800 pCi/l and 3 mu-Ci/l of tritiated water, repectively, under cross-flow filtration conditions. Reductions in the permeate of nearly 30% HTO were observed with these tritium concentrations. Low temperature (5 degrees C), low pressure (137.9-551.6 kPa), and high pH (near 10 or above) were required to obtain such reductions (rejection). Salt species (Na2SO4, CaCl2 and CaSO4) at various concentrations and pressures, within a 137.9-551.6 kPa range, did not appear to affect the HTO seperation efficiency. Mass balances performed during these experiments indicate an unaccounted small amount of tritium (0.5-2.2%). Sorption experiments with the polyphosphazene suggest that the membrane does not operate by an ion exchange mechanism; that is, tritium accumulation within the membrane.