Effects of Ozonation and Catalytic Ozonation on the Removal of Natural Organic Matter from Groundwater

Effects of ozone as a stand-alone and coagulation-aid treatment on the reduction of trihalomethanes precursors from high DOC and hardness water

“…However the values obtained in this study can be compared with some published literature showing DOC reduction ranged from 5% to 25% under typical ozone dose of 0.4e1 mg Ozone/mg DOC (Tuhkanen et al, 1994;Molnar et al, 2012). Pryor et al (2002) have reported up to 25% TOC reduction at lower applied ozone doses of 0.3e0.5 mg Ozone/mg DOC.…”

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

“…Unfortunately, regardless of the expansive list of the catalysts reported to enhance ozonation, the underpinning mechanisms are not well understood [21,22]. The generally proposed mechanism involves either the chemisorption of ozone or organic molecules or both on the catalyst surface, which may lead to either the formation of active species [36] or the formation of metal-organic complexes with higher reactivity toward molecular ozone [51]. In this work, no initial organic adsorption on the bare TiO 2 was observed in the dark control experiment, however, the intermediates generated by direct ozone attack, known to transform organic compounds and functional groups into smaller molecular weight saturated species, could be adsorbed on the catalyst [45].…”

Chlorine for Water Disinfection: Properties, Applications and Health Effects

“…Ozone is one of the powerful oxidant and disinfectant that can be used to remove DBP precursors (Chiang et al 2009;Kasprzyk-Horden et al 2003;Molnar et al 2012). The decomposition of ozone in water generates hydroxyl radicals (E OH/H2O = 2.72 V), which are of the most powerful oxidants that can be used for water treatment.…”