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Treatment of medical radioactive liquid waste using Forward Osmosis (FO) membrane process

Authors
Lee, SongbokKim, YoungjinPark, JungmiShon, Ho KyongHong, Seungkwan
Issue Date
15-6월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
Forward Osmosis; Radioactive liquid waste; Wastewater treatment; Membrane fouling; Radioactive iodine
Citation
JOURNAL OF MEMBRANE SCIENCE, v.556, pp.238 - 247
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
556
Start Page
238
End Page
247
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/74927
DOI
10.1016/j.memsci.2018.04.008
ISSN
0376-7388
Abstract
d The use of forward osmosis (FO) for concentrating radioactive liquid waste from radiation therapy rooms in hospitals was systematically investigated in this study. The removal of natural and radioactive iodine using FO was first investigated with varying pHs and draw solutions (DSs) to identify the optimal conditions for FO concentration. Results showed that FO had a successful rejection rate for both natural and radioactive iodine (I-125) of up to 99.3%. This high rejection rate was achieved at a high pH, mainly due to electric repulsion between iodine and membrane. Higher iodine removal by FO was also attained with a DS that exhibits a reverse salt flux (RSF) adequate to hinder iodine transport. Following this, actual radioactive medical liquid waste was collected and concentrated using FO under these optimal conditions. The radionuclides in the medical waste (I-131) were removed effectively, but the water recovery rate was limited due to severe membrane fouling. To enhance the recovery rate, hydraulic washing was applied, but this had only limited success due to combined organic-inorganic fouling of the FO membrane. Finally, the effect of FO concentration on the reduction of septic tank volume was simulated as a function of recovery rate. To our knowledge, this study is the first attempt to explore the potential of FO technology for treating radioactive waste, and thus could be expanded to the de-watering of the radioactive liquid wastes from a variety of sources, such as nuclear power plants.
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Hong, Seung kwan
공과대학 (건축사회환경공학부)
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