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http://dx.doi.org/10.14478/ace.2018.1026

Treatment of Waste Solution of Waste Refrigerant Decomposition Process Using Atmospheric Pressure Plasma  

Ko, Eun Ha (Department of Chemistry and Chemical Engineering, Inha University)
Yoo, Hyeonseok (Department of Chemistry and Chemical Engineering, Inha University)
Jung, Yong-An (Chemical Analysis Center, Korea Testing Certification)
Park, Dong-Wha (Department of Chemistry and Chemical Engineering, Inha University)
Kim, Dong-Wook (Department of Chemistry and Chemical Engineering, Inha University)
Choi, Jinsub (Department of Chemistry and Chemical Engineering, Inha University)
Publication Information
Applied Chemistry for Engineering / v.29, no.4, 2018 , pp. 479-483 More about this Journal
Abstract
Our group reported the thermal decomposition of R-22 ($CHClF_2$) refrigerants by nitrogen thermal plasma in previous studies. However, it was proposed that the wastewater generated from the end part of the process contains high concentration of fluoride ion which is a component of R-22. The additional post-treatment process to neutralize the $F^-$ ions in the wastewater was investigated in this study. The wastewater generated through the decomposition of R-22 with the same procedure in the previous work was treated using the neutralizer, $Ca(OH)_2$, and the atmospheric pressure plasma jet (APPJ) independently as a post-treatment process. Wastewater samples were collected directly after the treatment for ion-chromatography analysis to trace the change of the concentration of $F^-$ ion in the wastewater. The fluoride concentration in the wastewater showed the highest value when the single water was used as a neutralizer, and the concentration of fluoride in the wastewater was dramatically reduced when the post-treatments were performed.
Keywords
HCFC-22; $CHClF_2$; $N_2$ thermal plasma; water waste treatment;
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