Development of surrogate correlation models to predict trace organic contaminant oxidation and microbial inactivation during ozonation.
The performance of ozonation in wastewater depends on water quality and the ability to form hydroxyl radicals (·OH) to meet disinfection or contaminant transformation objectives. Since there are no on-line methods to assess ozone and ·OH exposure in wastewater, many agencies are now embracing indicator frameworks and surrogate monitoring for regulatory compliance. Two of the most promising surrogate parameters for ozone-based treatment of secondary and tertiary wastewater effluents are differential UV(254) absorbance (ΔUV(254)) and total fluorescence (ΔTF). In the current study, empirical correlations for ΔUV(254) and ΔTF were developed for the oxidation of 18 trace organic contaminants (TOrCs), including 1,4-dioxane, atenolol, atrazine, bisphenol A, carbamazepine, diclofenac, gemfibrozil, ibuprofen, meprobamate, naproxen, N,N-diethyl-meta-toluamide (DEET), para-chlorobenzoic acid (pCBA), phenytoin, primidone, sulfamethoxazole, triclosan, trimethoprim, and tris-(2-chloroethyl)-phosphate (TCEP) (R(2) = 0.50-0.83) and the inactivation of three microbial surrogates, including Escherichia coli, MS2, and Bacillus subtilis spores (R(2) = 0.46-0.78). Nine wastewaters were tested in laboratory systems, and eight wastewaters were evaluated at pilot- and full-scale. A predictive model for OH exposure based on ΔUV(254) or ΔTF was also proposed.
Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, Las Vegas, NV 89154-4015, United States. daniel.gerrity@unlv.edu
Daniel
D
Gerrity
Sujanie
S
Gamage
Darryl
D
Jones
Gregory V
GV
Korshin
Yunho
Y
Lee
Aleksey
A
Pisarenko
Rebecca A
RA
Trenholm
Urs
U
von Gunten
Eric C
EC
Wert
Shane A
SA
Snyder
D001412:Bacillus subtilis / Q000502:physiology; D004146:Dioxanes / Q000737:chemistry; D004203:Disinfection / Q000379:methods; D004926:Escherichia coli; D005453:Fluorescence; D017665:Hydroxyl Radical; D017909:Levivirus; D050296:Microbial Viability; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone; D010865:Pilot Projects; D015203:Reproducibility of Results; D013171:Spores, Bacterial; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D004146:Dioxanes; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D017665:Hydroxyl Radical; D010126:Ozone; C025223:1,4-dioxane