Degradation of Organics and Change Concentration in Per-Fluorinated Compounds (PFCs) during Ozonation and UV/H 2 O 2 Advanced Treatment of Tertiary-Treated Sewage

Jesmin Akter, Jai-yeop Lee, Hyun-Ju Ha, In Geol Yi, Da-Hye Hong, Chang-Min Park, Mok-Young Lee and Ilho Kim
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Jesmin Akter: Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Korea
Jai-yeop Lee: Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Korea
Hyun-Ju Ha: Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea
In Geol Yi: Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea
Da-Hye Hong: Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea
Chang-Min Park: Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea
Mok-Young Lee: Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea
Ilho Kim: Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Korea

Sustainability, 2022, vol. 14, issue 9, 1-12

Abstract: This study aimed to investigate the effect of H 2 O 2 addition, ozone feed rate, and UV addition on the change in the concentration of organics such as COD Mn , COD Cr , TOC, and PFCs in tertiary-treated effluent from a sewage treatment plant (STP) during the O 3 and UV/H 2 O 2 process. The degradation of organic pollutants from tertiary effluent is a significant challenge because biological treatment cannot degrade these recalcitrant pollutants. Therefore, the O 3 /UV/H 2 O 2 process was an effective method for treating recalcitrant organics. Several batch tests were conducted to investigate the direct UV photolysis, UV/H 2 O 2 , and ozone-based advanced oxidation process to degrade COD Mn , COD Cr , TOC, and PFCs. The chemical oxygen demand (COD) and total organic carbon (TOC) with UV irradiation showed 95% and 50% removal efficiency percentages under optimal conditions (initial pH = 6.7, H 2 O 2 dosage = 50 mg/L, ozone feed rate = 5.8 mg/L/min. Moreover, UV irradiation, with the addition of H 2 O 2 , and a sufficient dose of ozone, demonstrated the efficient removal of organic compounds by the indication of radical oxidation. (·OH) is the dominant mechanism. However, AOPs are not sufficient to fully treat the PFC compound; thus, additional procedures are required to degrade PFCs. In this study, the removal of organic recalcitrant contaminants and the change in added PFC concentration in tertiary-treated sewage were investigated by applying the ozone-based advanced oxidation process.

Keywords: organic compound; PFCs; tertiary wastewater; O 3 /UV/H 2 O 2 (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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