Choi Jongbok, Cui Mingcan, Lee Yonghyeon, Ma Junjun, Kim Jeonggwan, Son Younggyu, Khim Jeehyeong
School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Nanjing Green-Water Environment Engineering Limited by Share Ltd, 211500, People's Republic of China.
Ultrason Sonochem. 2019 Apr;52:326-335. doi: 10.1016/j.ultsonch.2018.12.004. Epub 2018 Dec 4.
A cost-effective method for treating oxalic acid (OA) during rare-earth extraction was developed using hydrodynamic cavitation (HC), ozone (O), and persulfate (PS) (HC@PS@O process). The results showed that the optimal inlet pressure during HC was 5.10 kg cm 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 was also shown to activate PS. For OA oxidation using the HC@PS@O process, the optimum pH was 3 and the reaction rate increased with increasing temperature. Further, the activation energy was 36.69 kJ mol. The mechanisms unveiled in this study will allow optimization of the HC@PS@O process as a chemical oxidation technology. The kinetic investigation and economic evaluation of the HC@PS@O process can be used as the basis for real wastewater treatment processes in the future.
采用水力空化（HC）、臭氧（O）和过硫酸盐（PS）（HC@PS@O工艺）开发了一种在稀土萃取过程中处理草酸（OA）的经济高效方法。结果表明，HC过程中的最佳入口压力为5.10 kg/cm，孔板直径为2 mm。此外，HC被证明可激活PS，为作为化学氧化的超声激活方法的碱或加热提供了一种替代激活方法。O也被证明可激活PS。对于使用HC@PS@O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。本研究揭示的机理将有助于优化HC@PS@O工艺作为一种化学氧化技术。HC@PS@O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。
