Experimental investigation and thermomechanical performance evaluation of supercritical water oxidation of n‐dodecane/tributyl phosphate

BACKGROUND Nuclear energy has brought immense benefits while also generating a large amount of wastewater that urgently needs to be processed. Supercritical water oxidation (SCWO) technology serves as an efficient method for wastewater treatment. In this study, a SCWO experiment was carried out with...

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Published in:Journal of chemical technology and biotechnology (1986) 2024-08, Vol.99 (8), p.1847-1859
Main Authors: Mi, Zhaoxia, Wang, Shuzhong, Sun, Shenghan, Li, Yanhui, Zhang, Fan, Duan, Yuanwang
Format: Article
Language:English
Subjects:
Catalysts
catalytic decomposition
Cerium oxides
Chemical oxygen demand
Decomposition
Decomposition reactions
Dodecane
energy and exergy efficiency
Exergy
kinetics
Nuclear energy
Nuclear reactor components
Nuclear reactors
Organic solvents
Oxidation
Parameters
Performance evaluation
Solvents
Supercritical water oxidation
Thermodynamics
Wastewater treatment
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Summary:BACKGROUND Nuclear energy has brought immense benefits while also generating a large amount of wastewater that urgently needs to be processed. Supercritical water oxidation (SCWO) technology serves as an efficient method for wastewater treatment. In this study, a SCWO experiment was carried out with organic solvent of 30% tributyl phosphate (TBP) and 70% n‐dodecane. This study investigated the operating parameters and the effects of enhanced oxidation techniques on chemical oxygen demand (COD) removal efficiency. An organic solvent SCWO process was developed, and its energy and exergy efficiencies were assessed using Aspen Plus. RESULTS The COD removal was about 96.18% at the experimental parameters of 500 °C, 10 min, 25 MPa, oxidation coefficient of 1.5 and material concentration of 4 wt%. COD removal increased by 3.09% with the addition of CeO2. Finally, the overall energy and exergy efficiencies of the SCWO system were found to be 58.8% and 9.1% respectively by Aspen Plus. CONCLUSION It was found that the reaction temperature had the greatest effect on the COD removal rate compared with other reaction parameters. The decomposition of organic solvents can be divided into two stages, fast and slow, and the addition of alkali and catalyst can effectively promote the decomposition of waste organic solvents. The experiments showed that SCWO is feasible for the treatment of n‐dodecane/TBP. © 2024 Society of Chemical Industry (SCI).
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.7686