TY - JOUR
T1 - Hybrid reactor based on hydrodynamic cavitation, ozonation, and persulfate oxidation for oxalic acid decomposition during rare-earth extraction processes
AU - Choi, Jongbok
AU - Cui, Mingcan
AU - Lee, Yonghyeon
AU - Ma, Junjun
AU - Kim, Jeonggwan
AU - Son, Younggyu
AU - Khim, Jeehyeong
N1 - Funding Information:
This work was supported by the National Research Foundation (NRF) project (No. 2017R1D1A1B03030079) and the Korean Ministry of the Environment as the Subsurface Environment Management (SEM) project (No. 2018002480009). The Korea Basic Science Institute (Western Seoul Center) is acknowledged for the data analysis (SD301).
Funding Information:
This work was supported by the National Research Foundation ( NRF ) project (No. 2017R1D1A1B03030079 ) and the Korean Ministry of the Environment as the Subsurface Environment Management ( SEM ) project (No. 2018002480009). The Korea Basic Science Institute (Western Seoul Center) is acknowledged for the data analysis (SD301).
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/4
Y1 - 2019/4
N2 - 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.
AB - 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.
KW - Hydrodynamic cavitation@persulfate@ozone process
KW - Hydroxyl radical
KW - Ozone
KW - Persulfate
KW - Rare-earth extraction wastewater
KW - Sulfate radical
UR - http://www.scopus.com/inward/record.url?scp=85059940049&partnerID=8YFLogxK
U2 - 10.1016/j.ultsonch.2018.12.004
DO - 10.1016/j.ultsonch.2018.12.004
M3 - Article
C2 - 30660376
AN - SCOPUS:85059940049
SN - 1350-4177
VL - 52
SP - 326
EP - 335
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
ER -