| Title |
Wastewater Reuse Technology Using Multi-AOPs: Integration of UV, Photocatalysis, and Sulfate Radical-Based Processes |
| Authors |
박준영(Park, Junyoung) ; 이상민(Lee, Sangmin) ; 진가현(Jin, Gahyeon) |
| DOI |
https://doi.org/10.12652/Ksce.2025.45.2.0213 |
| Keywords |
하폐수 재이용 기술; 과황산염; 티타늄 다이옥사이드; 자외선; 다중 자외선 기반 고도산화공정 Wastewater reuse technologies; Persulfate; TiO2; UV; Multi-UV-based advanced oxidation processes |
| Abstract |
As climate change intensifies, wastewater reuse technologies are emerging as crucial solutions for future water treatment challenges, particularly in addressing the urgent need for high-purity water in the semiconductor industry. This study investigated the application of multi-UV-based advanced oxidation processes (AOPs) that incorporate persulfate (PS) and titanium dioxide (TiO2) for treating effluent from wastewater treatment plants to meet semiconductor industry water quality standards. The treatment characteristics and efficiency of UV/PS and UV/TiO2/PS processes were systematically evaluated in lab-scale batch reactors, focusing on key operational parameters including UV light intensity, PS dosage, and TiO2 concentration. In the UV/PS process, optimal conditions of 26 W UV output and 3.7 mM (= 1 g/L) PS dosage achieved a maximum total organic carbon (TOC) removal efficiency of 89.08 % with a second-order rate constant of 1.98×10-2 L/mg·min. However, when UV treatment was applied independently, the TOC levels in treated water showed unstable patterns with an increasing trend. To address this limitation, the UV/TiO2/PS process was employed at 39 W UV output with
3.7 mM PS and 2 g/L TiO2, which resulted in an enhanced TOC removal efficiency of 92.58 % and a second-order rate constant of 2.18×10-2 L/mg·min. Although the overall removal efficiency was only marginally improved by the addition of TiO2, its inclusion significantly enhanced the stability of the AOPs process, ensuring consistent performance during long-term operation. These findings provide valuable insights for the development of industrial water reuse technologies by applying AOPs to effluent from wastewater treatment plants. |