Applying surrogates and indicators to assess removal efficiency of trace organic chemicals during chemical oxidation of wastewaters.
To respond to concerns associated with wastewater-derived contaminants water utilities are looking for new approaches for monitoring trace organic chemicals in conventional and advanced water treatment processes. This study examines the use of a combination of surrogate parameters and indicator compounds tailored to monitor the removal efficiency of advanced oxidation processes employed by treatment plants engaged in indirect potable water reuse programs. Potential surrogate parameters and indicator compounds, identified by reviewing previous publications and classified by their structural properties, were tested in pilot- and full-scale treatment systems. Dilantin, DEET, meprobamate, and iopromide are good indicators to assess optimized oxidation conditions while ozonating tertiary-treated wastewaters. UVA reduction, ozone byproduct formation, such as simple organic acids, and ozone exposure correlated with "sweet spot" compounds, where ozone exposure correlated with trace organic removal across five tertiary-treated wastewaters. Findings indicate that the proposed framework can serve as a conservative monitoring approach for advanced oxidation processes as well as other indirect potable reuse processes to ensure proper removal of identified and unidentified wastewater-derived organic contaminants, to detect failures in system performance, and is protective of public health.
Dickenson
Eric R V
ER
Advanced Water Technology Center (AQWATEC), Environmental Science and Engineering Division, Colorado School of Mines, Golden, Colorado 80401, USA.
Drewes
Jörg E
JE
Sedlak
David L
DL
Wert
Eric C
EC
Snyder
Shane A
SA
D007202:Indicators and Reagents / Q000737:chemistry; D009930:Organic Chemicals / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010126:Ozone; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
D007202:Indicators and Reagents; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D010126:Ozone