Abstract
Molten salt oxidation (MSO) is an advanced method for waste resins treatment; nevertheless, the research about gas product variations of resins under different stoichiometric air feed coefficient (α) is rare. The optimal working condition of hazardous waste disposal is obtained through thermodynamic equilibrium calculation, and the method to improve the treatment efficiency is found to guide the optimization of the actual experiment. In this paper, Fact Sage was used to calculate the oxidation products of cation exchange resins (CERs) at different temperatures and α, focusing on the similarities and differences through the contents of CO, CH4, CO2, and SO2 during the oxidation of CERs, the MSO of CERs, and the theoretical calculation. The results indicated that the gas products of the calculation and reality of the oxidation process of CERs are quite different, while the CO contents of CERs during MSO are close to the calculated values. The main reason for this consequence is that in the oxidation process of CERs, the S in the sulfonic acid group will form thermally stable C-S with the styrene–divinylbenzene skeleton. Moreover, the introduction of carbonate can promote the destruction of C-S and absorb SO2 as sulfate, weakening the influence of C-S on the oxidation products of CERs. The gas chromatograph results indicated that the SO2 content is reduced from 0.66% in the process of CERs oxidation to 0.28% in MSO of CERs. When 1.25 times stoichiometric air feed coefficient is fed, the sulfate content in the carbonate is the highest at 900 °C, which is 23.4%.
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Funding
This work was financially supported by the Decommissioning of nuclear facilities and special funds for radioactive waste management ([2019]1276), the National Natural Science Foundation of China (22176045, 21976047 and 21790373), and the University and Local Integration Development Project of Yantai, China (2020XDRHXMPT36), and the Sino-Russian Cooperation Fund of Harbin Engineering University (2021HEUCRF004).
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Yun Xue: methodology, formal analysis, software, writing original draft, and writing — reviewing and editing. Yue-Lin Wang: project advisor, validation, formal analysis, and writing — reviewing and editing. Yang-Hai Zheng: data curation, supervision, conceptualization, and writing — reviewing and editing. Yu-Sheng Yang: software, methodology, validation, and writing — reviewing and editing. Wen-Da Xu: formal analysis, conceptualization, methodology, and writing — reviewing and editing. Yong-De Yan: conceptualization, resources, investigation, and writing — reviewing and editing. Ran Zhao: supervision, formal analysis, software, and writing — reviewing and editing. Qing-Guo Zhang: methodology, validation, software, data curation, and writing — reviewing and editing. Xin Liu: data curation, supervision, software, and writing — reviewing and editing. Fu-Qiu Ma: formal analysis, conceptualization, methodology, writing — reviewing and editing. Mi-Lin Zhang: supervision, formal analysis, software, and writing — reviewing and editing.
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Xue, Y., Wang, YL., Zheng, YH. et al. Effects of oxygen content on gaseous and solid products during molten salt oxidation of cation exchange resins. Environ Sci Pollut Res 30, 16729–16740 (2023). https://doi.org/10.1007/s11356-022-24762-3
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DOI: https://doi.org/10.1007/s11356-022-24762-3