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) × 106 to (2.9 ±0.3) × 106 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) × 109 to (8.5 ±0.2) × 109 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).
Document Type: Research Article
Publication date: August 1, 2011
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