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    Treatment of Medical Radioactive Liquid Waste Using Forward Osmosis (FO) Membrane Process

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    Type
    Article
    Authors
    Lee, Songbok
    Kim, Youngjin cc
    Park, Jungmi
    Shon, Ho Kyong
    Hong, Seungkwan cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2018-04-07
    Online Publication Date
    2018-04-07
    Print Publication Date
    2018-06
    Permanent link to this record
    http://hdl.handle.net/10754/627549
    
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    Abstract
    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 (125I) 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 (131I) 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 dewatering of the radioactive liquid wastes from a variety of sources, such as nuclear power plants.
    Citation
    Lee S, Kim Y, Park J, Shon HK, Hong S (2018) Treatment of Medical Radioactive Liquid Waste Using Forward Osmosis (FO) Membrane Process. Journal of Membrane Science. Available: http://dx.doi.org/10.1016/j.memsci.2018.04.008.
    Sponsors
    This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korean government(MSIP:Ministry of Science, ICT) (No. 2017M2B2A9072516)
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2018.04.008
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S037673881830259X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2018.04.008
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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