Degradation of Bisphenol S Using O3 and/or H2O2 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 O3, ultraviolet (UV)/O3, UV/H2O2, and UV/O3/H2O2 were determined and reported. The degradation of BPS by O3 alone was competitive with the UV-promoted methods. An increase in BPS loss with O3 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 UV/O3/H2O2 and the O3 processes, the overall mineralization rate was different, indicating that the combination technique offers a more efficient system in terms of overall mineralization rate. The UV/O3/H2O2 process was the most effective and led to complete mineralization of 50mg/L BPS within 90min in both spiked water and postsecondary-treated wastewater.