Removal of trace organic compounds (TOrCs) from wastewater effluent has been identified as one of the main challenges for water reuse applications. Exposure of wastewater effluent to solar light leads to the attenuation of TOrCs by indirect photolysis due to the generation of singlet oxygen by photosensitizers present in the wastewater. In this work, indirect photolysis removal rates were measured for TOrCs commonly found in wastewater effluent. The second-order rate constants for TOrCs with singlet oxygen were determined from laboratory experiments utilizing competition kinetics under solar light and UVA (300-400 nm) as light sources. Methylene Blue and Rose Bengal were used as singlet oxygen photosensitizers, whereas furfuryl alcohol, a probe compound for singlet oxygen, was used as a competition agent. In particular, results show that phenolic compounds, such as bisphenol A and p-cresol, which have singlet oxygen reaction rate constants in the order of 108 M-1s-1, are sensitive to pH variations in the range usually encountered in wastewater effluents.

Kinetics of singlet oxygen indirect photolysis of trace organic compounds (TOrC) in wastewater effluent

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.