Hybrid reactor based on hydrodynamic cavitation, ozonation, and persulfate oxidation for oxalic acid decomposition during rare-earth extraction processes
- Authors
- Choi, Jongbok; Cui, Mingcan; Lee, Yonghyeon; Ma, Junjun; Kim, Jeonggwan; Son, Younggyu; Khim, Jeehyeong
- Issue Date
- 4월-2019
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Hydrodynamic cavitation@persulfate@ozone process; Ozone; Persulfate; Sulfate radical; Hydroxyl radical; Rare-earth extraction wastewater
- Citation
- ULTRASONICS SONOCHEMISTRY, v.52, pp.326 - 335
- Indexed
- SCIE
SCOPUS
- Journal Title
- ULTRASONICS SONOCHEMISTRY
- Volume
- 52
- Start Page
- 326
- End Page
- 335
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/66497
- DOI
- 10.1016/j.ultsonch.2018.12.004
- ISSN
- 1350-4177
- Abstract
- A cost-effective method for treating oxalic acid (OA) during rare-earth extraction was developed using hydrodynamic cavitation (HC), ozone (O-3), and persulfate (PS) (HC@PS@O-3 process). The results showed that the optimal inlet pressure during HC was 5.10 kg cm(-2) with an orifice plate diameter of 2 mm. Moreover, HC was shown to activate PS, providing an alternative activation method to base or heat as an ultrasound activation method for chemical oxidation. O-3 was also shown to activate PS. For OA oxidation using the HC@PS@O-3 process, the optimum pH was 3 and the reaction rate increased with increasing temperature. Further, the activation energy was 36.69 kJ mol(-1). The mechanisms unveiled in this study will allow optimization of the HC@PS@O-3 process as a chemical oxidation technology. The kinetic investigation and economic evaluation of the HC@PS@O-3 process can be used as the basis for real wastewater treatment processes in the future.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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