title: Removal of selected endocrine disrupting chemicals and personal care products in surface waters and secondary wastewater by ozonation.
abstract: This study investigated the removal of parabens, N,N-diethyl-m-toluamide (DEET), and phthalates by ozonation. The second-order rate constants for the reaction between selected compounds with ozone at pH 7 were of (2.2 +/-0.2) X 10(6) to (2.9 +/-0.3) X 10(6) M 1/s for parabens, (2.1+/- 0.3) to (3.9 +/-0.5) M-1/s for phthalates, and (5.2 +/-0.3) M-1/s for DEET. The rate constants for the reaction between selected compounds with hydroxyl radical ranged from (2.49 +/-0.06) x 10(9) to (8.5 +/-0.2) x 10(9) M-1/s. Ozonation of selected compounds in secondary wastewater and surface waters revealed that ozone dose of 1 and 3 mg/L yielded greater than 99% depletion of parabens and greater than 92% DEET and phthalates, respectively. In addition, parabens were found to transform almost exclusively through the reaction with ozone, while DEET and phthalates were transformed almost entirely by hydroxyl radicals (.OH).
authors: Environmental Research Group, Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia. khengsoo@um.edu.my
authors: Kheng Soo
authors: KS
authors: Tay
authors: Noorsaadah Abd
authors: NA
authors: Rahman
authors: Mhd Radzi Bin
authors: MR
authors: Abas
mesh_terms: D003671:DEET / Q000032:analysis / Q000737:chemistry; D052244:Endocrine Disruptors / Q000032:analysis / Q000737:chemistry*; D006795:Household Products / Q000032:analysis*; D007302:Insect Repellents / Q000032:analysis / Q000737:chemistry; D007700:Kinetics; D008296:Malaysia; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D010226:Parabens / Q000032:analysis / Q000737:chemistry; D010795:Phthalic Acids / Q000032:analysis / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D052244:Endocrine Disruptors; D007302:Insect Repellents; D010226:Parabens; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; D003671:DEET; D010126:Ozone