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

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY Journal of chemical technology and biotechnology Pub Date : 2024-06-11 DOI:10.1002/jctb.7686

Zhaoxia Mi, Shuzhong Wang, Shenghan Sun, Yanhui Li, Fan Zhang, Yuanwang Duan

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Abstract

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).

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正十二烷/磷酸三丁酯超临界水氧化实验研究与热力学性能评估

核能在带来巨大利益的同时，也产生了大量急需处理的废水。超临界水氧化（SCWO）技术是一种高效的废水处理方法。本研究使用 30% 磷酸三丁酯 (TBP) 和 70% 正十二烷的有机溶剂进行了 SCWO 实验。本研究调查了操作参数和增强氧化技术对化学需氧量（COD）去除效率的影响。实验参数为 500 °C、10 分钟、25 兆帕、氧化系数 1.5 和材料浓度 4 wt%，COD 去除率约为 96.18%。添加 CeO2 后，COD 去除率提高了 3.09%。最后，Aspen Plus 发现 SCWO 系统的总能效和放能效分别为 58.8% 和 9.1%。有机溶剂的分解可分为快慢两个阶段，碱和催化剂的加入可有效促进废有机溶剂的分解。实验表明，SCWO 处理正十二烷/TBP 是可行的。© 2024 化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.