Kinetics and Transformations of Diverse Dissolved Organic Matter Fractions with Sulfate Radicals

• DOI: 10.1021/acs.est.1c08388
• Publication Date: 2022-03-18T14:43:55Z
• Authors: Xin Lei; Yu Lei; Jingmeng Guan; Paul Westerhoff; Xin Yang
• Keywords: Disinfection; Kinetics; Halogenation; Sulfates; 0211 other engineering and technologies; 02 engineering and technology; Dissolved Organic Matter; Water Pollutants, Chemical; 6. Clean water; Water Purification

Dissolved organic matter (DOM) scavenges sulfate radicals (SO4•–), and SO4•–-induced DOM transformations influence disinfection byproduct (DBP) formation when chlorination follows advanced oxidation processes (AOPs) used for pollutant destruction during water wastewater treatment. Competition kinetics experiments transient were conducted in the presence of 19 fractions. Second-order reaction rate constants reactions with SO4•– (kDOM,SO4•–) ranged from (6.38 ± 0.53) × 106 M–1 s–1 to (3.68 0.34) 107 MC–1 s–1. kDOM,SO4•– correlated specific absorbance at 254 nm (SUVA254) (R2 = 0.78) or total antioxidant capacity 0.78), suggesting that more aromatics antioxidative moieties reacted faster SO4•–. exposure activated DBP precursors increased carbonaceous (C-DBP) yields (e.g., trichloromethane, chloral hydrate, 1,1,1-trichloropropanone) humic acid fulvic fractions despite great reduction their carbon, chromophores, fluorophores. Conversely, reduced nitrogenous dichloroacetonitrile trichloronitromethane) effluent algal without forming C-DBP precursors. as a function (concentration time) provides guidance on optimization strategies SO4•–-based AOPs realistic matrices.