The reaction of ozone with NOM (Natural Organic Matter) can occur by two different
pathways: that involving molecular ozone and by way of reactions with hydroxy 1
radicals which are produced from the decomposition of molecular ozone. As such, the
formation of ketoacids and Assimilable Organic Carbon(AOC) can be controlled by
controlling the pathway by which ozone reacts with NOM. The ratios of[OHㆍ]/[O₃] (Rст
values) were determined under the various ozonation conditions. The Rст values
increased with increasing initial ozone concentration. The Rст values (ranges from 10
to 35℃) increased linearly as temperature increased (within the range from 10 to
35℃). However, Rст was independent of hydraulic retention time (HRT). Operational
conditions were found to affect the formation of AOC. The conditions where the
molecular ozone reaction predominated resulted in an increase in the formation of AOC.
