Abstract
One of the most common treatment methods for spent ion exchange resins is their immobilization in cement, which reduces the release of radionuclides into the environment. Although this method is efficient, it considerably increases the final volume of the waste due to its low incorporation capacity. This work aims to evaluate the degradation of ion exchange resins by the Fenton process (H2O2/Fe2+). The resin evaluated was a mixture of cationic and anionic resins, both non-radioactive. The reactions were conducted by varying the catalyst concentration (25, 50, 100, and 150 mmol L−1) and the volume of hydrogen peroxide. Three different temperatures were evaluated by varying the flow of reactants, which were 50, 60, and 70 °C. Cement specimens were prepared from the treated solutions and two parameters were assessed—namely, final setting time and axial compressive strength. The results showed that the experimental conditions were suitable to dissolve the resins, and the Fe3+ produced as precipitate during the experiments increased the resistance of the final product. The immobilized product complied with the limits established by regulation.
Highlights
Ion exchange resins (IER) are among the most common radioactive wastes generated from nuclear reactors
There are many treatment methods under development at research institutes, capable of degrading the resin and increasing its incorporation in the cement matrix. These techniques aim to reduce waste volume and cost compared to a common direct immobilization approach. In this context, Advanced Oxidation Processes (AOPs) are considered a good option, since they are performed at room temperature and pressure [2,3]
AOPs are capable of degrading many organic compounds by means of highly reactive hydroxyl radicals [4]
Summary
Ion exchange resins (IER) are among the most common radioactive wastes generated from nuclear reactors. There are many treatment methods under development at research institutes, capable of degrading the resin and increasing its incorporation in the cement matrix. These techniques aim to reduce waste volume and cost compared to a common direct immobilization approach. In this context, Advanced Oxidation Processes (AOPs) are considered a good option, since they are performed at room temperature and pressure [2,3]. According to [6], the immobilization of IER treated by Fenton’s reagent may reduce costs regarding final disposal and transport by 50% when compared to direct immobilization
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
