%0 Journal Article %A Nanaboina, Venkateswarlu %A Korshin, Gregory V. %D 2010 %T Evolution of Absorbance Spectra of Ozonated Wastewater and Its Relationship with the Degradation of Trace-Level Organic Species %U https://acs.figshare.com/articles/journal_contribution/Evolution_of_Absorbance_Spectra_of_Ozonated_Wastewater_and_Its_Relationship_with_the_Degradation_of_Trace_Level_Organic_Species/2742934 %R 10.1021/es1005175.s001 %2 https://acs.figshare.com/ndownloader/files/4420420 %K Absorbance Spectra %K absorbance spectra %K ozone concentrations %K DEET %K Ozonated Wastewater %K treatment times %K EfOM chromophores %K degradation %K ozonated wastewater %K evolution %K EfOM absorbance %K 320 nm %K wastewater ozonated %X This study examined the evolution of absorbance spectra of wastewater ozonated using varying initial ozone concentrations or treatment times; concomitant changes of concentrations of trace-level pharmaceuticals were also quantified. The absorbance of ozonated wastewater decreased due to the degradation of chromophores in effluent organic matter (EfOM). The relative decrease of absorbance (ΔA/A0) ranged from <30% for λ < 250 nm to >80% for λ > 320 nm. The removal of atenolol, carbamazepine, DEET, diclofenac, gemfibrozil, ibuprofen, iopromide, naproxen, propranolol, sulfamethoxazole, trimethoprim, and p-chlorobenzoic acid was strongly correlated with ΔA/A0 values. The observed features were hypothesized to correspond to the engagement of kinetically distinct groups of EfOM chromophores. Modeling of the evolution of EfOM absorbance and concurrent degradation of trace-level organic species based on this hypothesis confirmed its applicability and utility for practical applications and theoretical exploration. %I ACS Publications