title: AOPs with ozone and UV radiation in drinking water: contaminants removal and effects on disinfection byproducts formation.
abstract: In this study, the advanced oxidation with ozone and UV radiation (with two low pressure UV lamps, at 254 and 185 nm wavelength) were experimented on a surface water in order to study the removal of two odorous compounds (geosmin and 2-methylisoborneol) and a pesticide (metolachlor), the influence on organic compounds (UV absorbance and THM precursors) and bromate formation. Different batch tests were performed with ozone concentration up to 10 mg/L, UV dose up to 14,000 J/m2 and a maximum contact time of 10 minutes. The main results show that metolachlor can be efficiently removed with ozone alone while for geosmin and MIB a complete removal can be obtained with the advanced oxidation of ozone (with concentration of 1.5-3 mg/L and contact time of 2-3 minutes) with UV radiation (with doses of 5,000-6,000 J/m2). As concerns the influence on the organic precursors, all the experimented processes show a medium removal of about 20-40% for UV absorbance and 15-30% for THMFP (trihalomethanes formation potential). As concerns bromate formation, the advanced oxidation of ozone/UV 254 nm shows a bromate formation that is about 40% lower with respect to conventional oxidation with ozone.
authors.affiliation: Department of Civil Engineering, University of Brescia, via Branze 38, Brescia, 25123, Italy. carlo.collivignarelli@ing.unibs.it
authors.forename: C
authors.initials: C
authors.lastname: Collivignarelli
authors.forename: S
authors.initials: S
authors.lastname: Sorlini
mesh_terms: D000081:Acetamides / Q000302:isolation & purification; D001892:Camphanes / Q000302:isolation & purification; D004203:Disinfection; D006540:Herbicides / Q000302:isolation & purification; D009284:Naphthols / Q000302:isolation & purification; D009812:Odorants; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D000081:Acetamides; D001892:Camphanes; D006540:Herbicides; D009284:Naphthols; D010083:Oxidants, Photochemical; C005536:2-methylisoborneol; D010126:Ozone; C001278:geosmin; C051786:metolachlor