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Hybrid reactor based on hydrodynamic cavitation, ozonation, and persulfate oxidation for oxalic acid decomposition during rare-earth extraction processes
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2018-12-04 , DOI: 10.1016/j.ultsonch.2018.12.004
Jongbok Choi , Mingcan Cui , Yonghyeon Lee , Junjun Ma , Jeonggwan Kim , Younggyu Son , Jeehyeong Khim

A cost-effective method for treating oxalic acid (OA) during rare-earth extraction was developed using hydrodynamic cavitation (HC), ozone (O3), and persulfate (PS) (HC@PS@O3 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. O3 was also shown to activate PS. For OA oxidation using the HC@PS@O3 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@O3 process as a chemical oxidation technology. The kinetic investigation and economic evaluation of the HC@PS@O3 process can be used as the basis for real wastewater treatment processes in the future.



中文翻译:

基于水力空化,臭氧化和过硫酸盐氧化的混合反应堆,用于稀土萃取过程中的草酸分解

开发了一种利用水力空化(HC),臭氧(O 3)和过硫酸盐(PS)处理稀土萃取过程中草酸(OA)的经济有效方法(HC @ PS @ O 3工艺)。结果表明,在HC期间的最佳入口压力为5.10 kg cm -2,孔板直径为2 mm。此外,显示出HC可以激活PS,从而提供了一种替代碱或热的激活方法,作为化学氧化的超声激活方法。O 3也显示出激活PS。对于使用HC @ PS @ O 3工艺的OA氧化,最佳pH为3,反应速率随温度升高而增加。此外,活化能为36.69 kJ mol -1。这项研究中揭示的机制将使作为化学氧化技术的HC @ PS @ O 3工艺得以优化。HC @ PS @ O 3工艺的动力学研究和经济评估可作为未来实际废水处理工艺的基础。

更新日期:2018-12-04
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