Pilot Scale Evaluation of Ozone-Granular Activated Carbon Combinations for Trihalomethane Precursor Removal

Drinking-water treatment with ozone

“…Peyton and Glaze (25,31) have verified the earlier work of Taube (32), who showed that the UV photolysis of ozone in water yields hydrogen peroxide rather than two hydroxyl radicals, as occurs in wet air. Thus, the ozone-UV process resembles the ozone-peroxide process but offers the additional advantage that direct photolysis and photosynthesized processes also occur to decompose organic substrates.…”

Destruction of pollutants in water with ozone in combination with ultraviolet radiation. II. Natural trihalomethane precursors

“…Of the advanced treatment methods for removal of precursors, one has been seriously proposed, that is, the use of granular-activated-carbon filtration (23). With the prospect of combined adsorption and biological degradation ( 14), this method becomes increasingly attractive, but it is as yet unproven for THM control under conditions as severe as those described here (24). For these cases, ozone with ultraviolet radiation may well become a viable alternative.…”

Destruction of pollutants in water with ozone in combination with ultraviolet radiation. 3. Photolysis of aqueous ozone

“…Thus, an advantage of the photolytic ozonation system for water treatment is that there are multiple pathways for hydroxyl radical generation, so that the reaction system can "adjust" the mechanistic pathway to suit reaction conditions. Conclusions (1) Hydroxyl radical is the principal active species in photolytic ozonation.…”