Bench-scale ozonation for removing constituents of emerging concern

Abstract

This study assessed the efficiencies of removing constituents of emerging concern (CECs) with ozone and ozone in combination with hydrogen peroxide (O3/H2O2) in a bench-scale flow-through system. Five CECs were selected for evaluation: atrazine, caffeine, carbamazepine, primidone, and tris (2-chloroethyl) phosphate (TCEP). Two modeling compounds, 2-methylisoborneol (MIB) and geosmin, were used to establish bench-scale operating conditions that mimicked previous pilot-and demonstration-scale removals. The study demonstrated that CEC removal efficiencies in bench-scale systems are generally consistent with removals in full-scale systems. As such, the bench-scale system can be used to predict full-scale removals. Additionally, bench-scale results showed that CEC removal efficiencies were generally higher in State Project water (SPW) than in Colorado River water (CRW) or an SPW/CRW blend. In all probability, these results were a consequence of the rapid formation of hydroxyl radicals in SPW. relatively.