Oxidation of ibuprofen in water by UV/O3 process: Removal, byproducts, and degradation pathways

Suppressing Organic Bromine but Promoting Bromate: Is the Ultraviolet/Ozone Process a Double-Edged Sword for the Toxicity of Wastewater to Mammalian Cells?

“…However, UV/O 3 may be more economical for the same degradation goal. For example, the E EO values for UV/O 3 , O 3 , and UV processes were 16.55, 77.19, and 108.37 kWh/m 3 , respectively, at 99.8% degradation of 10 mg/L ibuprofen . Similar findings have been reported when the UV/O 3 process was used to treat synthetic wastewater and drinking water with multiple pollutes, ,, mainly due to the fact that UV/O 3 can degrade refractory organics in a shorter period of time.…”

“…For example, the E EO values for UV/O 3 , O 3 , and UV processes were 16.55, 77.19, and 108.37 kWh/m 3 , respectively, at 99.8% degradation of 10 mg/L ibuprofen. 19 Similar findings have been reported when the UV/O 3 process was used to treat synthetic wastewater and drinking water with multiple pollutes, 53,75,76 mainly due to the fact that UV/O 3 can degrade refractory organics in a shorter period of time. This serves as a reminder that to meet specific degradation requirements, the additional UV equipment costs for long-term use can be covered.…”

“…Electron paramagnetic resonance (EPR) tests indicated that a quartet-signal with the intensity of 1:2:2:1 was observed during UV/O 3 (Figure d), and the generated signal was assigned to ·OH . As a potent oxidant, ·OH is responsible for the amplified oxidation of DOM (according to the following possible reactions, eqs – ) and the elevation of bromate levels during the UV/O 3 process. normalO 3 + DOM → DOM oxi · OH + DOM → DOM oxi DOM + italichv → DOM • → DOM oxi …”

“…The relative intensity (RI) of the components was calculated, using the molecular formula intensity of each The UV/O 3 process provides greater oxidation of specific DOM and higher mineralization rates than O 3 alone. 19,53 This may be due to the fact that UV/O 3 promotes the production of hydroxyl radicals (•OH), which is nonselective and considered the strongest oxidant available for water treatment. 17 Both O 3 and •OH react with highly aromatic compounds, while •OH also oxidizes more saturated formulas.…”

“…UV/O 3 is a typical advanced oxidation process, wherein the synergistic effect of UV and O 3 on pollutant degradation has been established. , Previous studies have demonstrated that compared to individual UV or O 3 processes, the UV/O 3 process exhibits superior performance in terms of organic contaminant oxidation, such as ibuprofen, p -nitroaniline, and sucralose. ,− Moreover, the UV/O 3 process enhanced the mineralization of organic matter by O 3 when applied to wastewater treatment, especially at higher irradiation doses. ,, The benefits can be attributed to multiple reactions that occur during UV/O 3 , including direct oxidation, UV photolysis, and radical reactions.…”