title: On-line sensor monitoring for chemical contaminant attenuation during UV/H2O2 advanced oxidation process.
abstract: A combination of surrogate parameters and indicator compounds were measured to predict the removal efficiency of trace organic compounds (TOrCs) using low pressure (LP)-UV/H2O2 advanced oxidation process (AOP), engaged with online sensor-based monitoring system. Thirty-nine TOrCs were evaluated in two distinct secondary wastewater effluents in terms of estimated photochemical reactivity, as a function of the rate constants of UV direct photolysis (kUV) and hydroxyl radical (OH) oxidation (kOH). The selected eighteen TOrCs were classified into three groups that served as indicator compounds: Group 1 for photo-susceptible TOrCs but with minor degradation by OH oxidation (diclofenac, fluoxetine, iohexol, iopamidol, iopromide, simazine and sulfamethoxazole); Group 2 for TOrCs susceptible to both direct photolysis and OH oxidation (benzotriazole, diphenhydramine, ibuprofen, naproxen and sucralose); and Group 3 for photo-resistant TOrCs showing dominant degradation by OH oxidation (atenolol, carbamazepine, DEET, gemfibrozil, primidone and trimethoprim). The results indicate that TOC (optical-based measurement), UVA254 or UVT254 (UV absorbance or transmittance at 254 nm), and total fluorescence can all be used as suitable on-line organic surrogate parameters to predict the attenuation of TOrCs. Furthermore, the automated real-time monitoring via on-line surrogate sensors and equipped with the developed degradation profiles between sensor response and a group of TOrCs removal can provide a diagnostic tool for process control during advanced treatment of reclaimed waters.
authors.affiliation: Department of Chemical and Environmental Engineering, College of Engineering, University of Arizona, Tucson, AZ 85721, United States; Department of Soil, Water and Environmental Science, College of Agriculture and Life Science, University of Arizona, Tucson, AZ 85721, United States.
authors.forename: Hye-Weon
authors.initials: HW
authors.lastname: Yu
authors.affiliation: Department of Chemical and Environmental Engineering, College of Engineering, University of Arizona, Tucson, AZ 85721, United States; Agilent Technologies Inc., Wilmington, DE 19808, United States.
authors.forename: Tarun
authors.initials: T
authors.lastname: Anumol
authors.affiliation: Department of Chemical and Environmental Engineering, College of Engineering, University of Arizona, Tucson, AZ 85721, United States.
authors.forename: Minkyu
authors.initials: M
authors.lastname: Park
authors.affiliation: Department of Soil, Water and Environmental Science, College of Agriculture and Life Science, University of Arizona, Tucson, AZ 85721, United States.
authors.forename: Ian
authors.initials: I
authors.lastname: Pepper
authors.affiliation: Xylem Services GmbH, Boschstraße 4, 32051 Herford, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Scheideler
authors.affiliation: Department of Chemical and Environmental Engineering, College of Engineering, University of Arizona, Tucson, AZ 85721, United States; National University of Singapore, NUS Environmental Research Institute (NERI), Singapore 117411, Singapore. Electronic address: snyders2@email.arizona.edu.
authors.forename: Shane A
authors.initials: SA
authors.lastname: Snyder
mesh_terms: D052244:Endocrine Disruptors / Q000032:analysis / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D006861:Hydrogen Peroxide / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D010575:Pesticides / Q000032:analysis*; D004364:Pharmaceutical Preparations / Q000032:analysis* / Q000737:chemistry; D010782:Photolysis; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D052244:Endocrine Disruptors; D006861:Hydrogen Peroxide; D009930:Organic Chemicals; D010575:Pesticides; D004364:Pharmaceutical Preparations; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Indicator; On-line sensor; Surrogate; Trace organic compound (TOrC); UV/H(2)O(2); Water reuse