Degradation of Organics and Change Concentration in Per-Fluorinated Compounds (PFCs) during Ozonation and UV/H2O2 Advanced Treatment of Tertiary-Treated Sewage

Sustainability

Ilho Kim¹  Jai-yeop Lee¹  Jesmin Akter¹  Hyun-Ju Ha²  In Geol Yi²  Chang-Min Park²  Mok-Young Lee²  Da-Hye Hong² 

[1] Department of Civil and Environmental Engineering, University of Science and Technology, Daejeon 34113, Korea;Department of Water Environment Research, Seoul Metropolitan Government Research Institute of Public Health and Environment, Seoul 13818, Korea;

关键词: organic compound;    PFCs;    tertiary wastewater;    O₃/UV/H₂O₂;   

DOI  :  10.3390/su14095597

来源: DOAJ

【 摘 要 】

This study aimed to investigate the effect of H₂O₂ 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 O₃ and UV/H₂O₂ process. The degradation of organic pollutants from tertiary effluent is a significant challenge because biological treatment cannot degrade these recalcitrant pollutants. Therefore, the O₃/UV/H₂O₂ process was an effective method for treating recalcitrant organics. Several batch tests were conducted to investigate the direct UV photolysis, UV/H₂O₂, 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, H₂O₂ dosage = 50 mg/L, ozone feed rate = 5.8 mg/L/min. Moreover, UV irradiation, with the addition of H₂O₂, 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.

【 授权许可】

Unknown