Examining the Role of Effluent Organic Matter Components on the Decomposition of Ozone and Formation of Hydroxyl Radicals in Wastewater |
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Authors: | Sarah Gonzales Andria Peña |
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Affiliation: | 1. Department of Civil, Environmental and Architectural Engineering , University of Colorado , Boulder , Colorado , 80309 , USA;2. Department of Chemical Engineering , University of Puerto Rico , Mayaguez , Puerto Rico , 00681 , USA |
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Abstract: | The impact of wastewater derived effluent organic matter (EfOM) on the decomposition of ozone and formation of hydroxyl radicals (HO●) was evaluated for four wastewaters (sites A, B, C1 and C2). The reactivity of EfOM was assessed by fractionation into four apparent molecular weight (AMW) fractions (<10 kDa, <5 kDa, <3 kDa, and <1 kDa). The RCT, defined as the ratio of HO● exposure to ozone exposure (∫HO●dt?/?∫O3dt), was measured for all fractions and bulk waters (at times greater than 5 seconds), with an initial ozone dose equal to the total carbon concentration of EfOM (ozone:DOC ratio of 1). The RCT of all the samples and ozone first-order decay rates of two of the waters increased significantly (95% confidence) from the bulk sample to the <10 kDa fraction, and decreased with AMW. This indicates that the intrinsic capacity of different molecular weight fractions of the EfOM have different reactivity with ozone. |
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Keywords: | Ozone Effluent Organic Matter RCT Wastewater Hydroxyl Radical |
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