Degradation of Bisphenol S Using ${\mathrm{O}}_3$ and/or ${\mathrm{H}}_2{\mathrm{O}}_2$ with UV in a Flow-Through Reactor

In this paper, degradation of bisphenol S (BPS) in spiked water and postsecondary-treated wastewater by a variety of oxidation processes was investigated in a flow-through reactor. Kinetics of degradation in ${\mathrm{O}}_3$, ultraviolet $(\mathrm{UV})/{\mathrm{O}}_3$, $\mathrm{UV}/{\mathrm{H}}_2{\mathrm{O}}_2$, and $\mathrm{UV}/{\mathrm{O}}_3/{\mathrm{H}}_2{\mathrm{O}}_2$ were determined and reported. The degradation of BPS by ${\mathrm{O}}_3$ alone was competitive with the UV-promoted methods. An increase in BPS loss with ${\mathrm{O}}_3$ was observed in postsecondary-treated wastewater, demonstrating its potential application as a treatment method for BPS. Total organic carbon (TOC) as an indicator of the extent of organic compound mineralization and sulfate as a by-product produced during degradation were measured. It was noted that although the loss of BPS was similar in the $\mathrm{UV}/{\mathrm{O}}_3/{\mathrm{H}}_2{\mathrm{O}}_2$ and the ${\mathrm{O}}_3$ processes, the overall mineralization rate was different, indicating that the combination technique offers a more efficient system in terms of overall mineralization rate. The $\mathrm{UV}/{\mathrm{O}}_3/{\mathrm{H}}_2{\mathrm{O}}_2$ process was the most effective and led to complete mineralization of $50\mathrm{mg}/\mathrm{L}$ BPS within 90 min in both spiked water and postsecondary-treated wastewater.