Journal
OZONE-SCIENCE & ENGINEERING
Volume 34, Issue 1, Pages 42-48Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01919512.2011.637387
Keywords
Ozone; Effluent Organic Matter; R-CT; Wastewater; Hydroxyl Radical
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Funding
- Civil, Environmental and Architectural Engineering (CEAE) department at the University of Colorado, Boulder
- U.S. National Science Foundation [0926396]
- Summer Multicultural Access to Research Training (SMART) program
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The impact of wastewater derived effluent organic matter (EfOM) on the decomposition of ozone and formation of hydroxyl radicals (HO center dot) 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 R-CT, defined as the ratio of HO center dot exposure to ozone exposure (integral HO(center dot)dt / integral O(3)dt), 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 R-CT 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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