The production property of H 2O 2 formed by O 3 photolysis reaction in O 3/UV process and applied CT value of H 2O 2 as a control parameter of O 3/UV process was studied. The removal efficiencies of A 254, specific UV absorbance, haloacetic acid formation potential, pesticides, phthalates, and bisphenol-A by O 3, UV and O 3/UV combined processes were presented. In all the target parameters, the highest efficiency was obtained from O 3/UV process. From each efficiency of the tested processes, enhancement factor (E factor) was calculated, indicating the efficiency enhanced by O 3/UV process as compared to the summation efficiency of O 3 and UV only processes. E factor ranged from 0.9 to 2.5, showing the synergic effect of O 3 and UV combination for almost all target compounds. This synergetic effect was useful to validate the application of O 3/UV in water treatment. Photolysis of aqueous O 3 directly yielded H 2O 2, which then, along with O 3, participated in secondary reactions to produce hydroxyl radical. In the entire O 3 dose rates, the concentration of H 2O 2 rose with increase of the reaction time, drawing the parabolic pattern. The higher O 3 dose rate provided the faster H 2O 2 formation rate and the higher concentration at steady state. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).
|Number of pages||7|
|Journal||ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts|
|Publication status||Published - 2004 Dec 1|
|Event||228th ACS National Meeting - Philadelphia, PA, United States|
Duration: 2004 Aug 22 → 2004 Aug 26
All Science Journal Classification (ASJC) codes