Efficient Separation
of Tritiated Water from Light
Water Based on Membrane Distillation by Gas–Liquid Exchange
Posted on 2024-10-31 - 08:03
The
removal of tritiated water (HTO) from “ALPS-treated
water” originating from the disabled Fukushima Daiichi Nuclear
Power Plant (FDNPP) is an important environmental issue. In this paper,
we report a new method of separating HTO from light water (H2O) based on membrane distillation by gas–liquid exchange.
HTO-containing water loaded on a hydrophobic membrane modified with
a photothermal black dye was exposed to artificial sunlight. The heat
generated from the dye upon sunlight exposure vaporized the water,
with the HTO-containing water vapor penetrating through the membrane.
The permeated HTO-containing water vapor was mixed with H2O added to hydrophilic filters under the membrane. Gas–liquid
exchange occurred in these filters and significantly decreased the
percentage of HTO in the water collected under all filters. The increases
in both the filter number and H2O content in the hydrophilic
filters increased the efficiency of HTO separation. When four hydrophilic
filters containing H2O and four hydrophobic filters were
set alternately, the ratio of HTO collected under these filters decreased
to 12 ± 0.3%. This process was also effective for the removal
of 137Cs from 137Cs-containing water.
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Miyoshi, Hirokazu; Fujiwara, Masahiro (2024). Efficient Separation
of Tritiated Water from Light
Water Based on Membrane Distillation by Gas–Liquid Exchange. ACS Publications. Collection. https://doi.org/10.1021/acssusresmgt.4c00305