Removal of Refractory Organic Compounds Using Peroxy Radical and Ozone Reaction in Aqueous Solution |
| Journal |
Materials Science Forum (Volume 569) |
| Volume |
Eco-Materials Processing and Design IX |
| Edited by |
Byungsei Jun, Hyungsun Kim, Chanwon Lee, Soo Wohn Lee |
| Pages |
33-36 |
| DOI |
10.4028/www.scientific.net/MSF.569.33 |
| Online since |
January, 2008 |
| Authors |
Jong Tae Jung,
Jong Oh Kim,
Bum Gun Kwon,
Dong Ha Song
|
| Keywords |
Ozone, Peroxy Radical, Refractory Organic Compounds, Titania (TiO2), UV |
| Abstract |
This study was conducted to evaluate the treatment performance of the system using
peroxy radical/ozone reaction for refractory organic compounds removal in aqueous solution. The
effect of initial humic acid concentration was conducted under the conditions of humic acid
concentration 10 mg/L, 30 mg/L, 50 mg/L and 100 mg/L. Reaction rate constant (k) in 30 mg/L of
humic acid concentration was higher than that of humic acid concentration 10 mg/L, 50 mg/L amd
100 mg/L. However, it decreased over the range of 30 mg/L of humic acid concentration due to the
action of internal filter of humic acid itself. Reaction rate constant (k) in the initial 20 minute of
reaction time was accelerated by decreasing hydraulic retention time (HRT). This may be ascribed
to increase the reaction time between peroxy radical and ozone. pH is a key for both ozone stability
and TiO2 surface property in aqueous solution. Reaction rate constant (k) of acid solution on pH
variation was smaller compared to that of neutral or basic circumstances because ozone decomposes
easily into hydroxyl radicals in neutral or basic solution. At reaction rate constant (k) for humic acid
degradation in each unit process, peroxy radical/ozone combined system was higher than that of
ozone only due to the effective production of hydroxyl radical. An obvious difference between
ozone and peroxy radical/ozone is the consequence of hydroxyl radical produced by the reaction of
ozone molecules and peroxy radicals. |
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