• UV/O3 process had higher TAIC mineralization rate than O3 process. • Four possible degradation pathways were proposed during TAIC degradation. • pH impacted oxidation processes with pH of 9 achieving maximum efficiency. • CO32– negatively impacted TAIC degradation while HCO3– not. • Cl– can be radicals scavenger only at high concentration (over 500 mg/L Cl–).
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Triallyl isocyanurate (TAIC, C
12H
15N
3O
3) has featured in wastewater treatment as a refractory organic compound due to the significant production capability and negative environmental impact. TAIC degradation was enhanced when an ozone(O
3)/ultraviolet(UV) process was applied compared with the application of an independent O
3 process. Although 99% of TAIC could be degraded in 5 min during both processes, the O
3/UV process had a 70%mineralization rate that was much higher than that of the independent O
3 process (9%) in 30 min. Four possible degradation pathways were proposed based on the organic compounds of intermediate products identified during TAIC degradation through the application of independent O
3 and O
3/UV processes. pH impacted both the direct and indirect oxidation processes. Acidic and alkaline conditions preferred direct and indirect reactions respectively, with a pH of 9 achieving maximum Total Organic Carbon (TOC) removal. Both CO
32– and HCO
3– decreased TOC removal, however only CO
32– negatively impacted TAIC degradation. Effects of Cl
– as a radical scavenger became more marked only at high concentrations (over 500 mg/L Cl
–). Particulate and suspended matter could hinder the transmission of ultraviolet light and reduce the production of HO· accordingly.
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