No abstract

In the present work, we investigated the degradation behavior of phenol sparingly dissolved in water with ozone treatment with/without subsidiary additions of CaCO 3 and/or H 2 O 2 . The enhancement effects of these additives for ozone-oxidation processing were investigated based on the variation of pH value and amounts of organic acids produced in the aqueous phase. Addition of a small amount of CaCO 3 in the aqueous phase, which could maintain the pH in a range of high values, resulted in a significant enhancement on the ozone-degradation rate of phenol instead of giving rise to negative scavenger effects. Addition of H 2 O 2 under the presence of 0.1 g/L of CaCO 3 in the aqueous phase most enhanced the ozone-degradation of phenol in a range of dissolved ozone concentrations examined and caused small net production of organic acid components. The apparent first-order rate constant for phenol degradation was well correlated in terms of the dissolved ozone concentration under the influences of the addition of oxidation promoters for practical purposes.