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|Title:||Degradation of pesticide by combined photofenton-ozonation process and study of its synergistic effect|
Combined photofenton-ozonation (PFO)
|Abstract:||This study presents degradation of pesticide, carbaryl, by combined photofenton-ozonation (PFO) process. Experiments were conducted under pH (3-9), ferrous ion dosage (0-600 mg/l), hydrogen peroxide (0-4 g/l) and ozone dosages (0.12-0.57 g/h) for optimized reaction conditions of carbaryl degradation. Five experimental sets (UV/Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>,UV /O<sub>3</sub>, Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>, O<sub>3</sub> and UV/Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>/O<sub>3</sub>) were conducted under optimized conditions to prove synergistic effect. Kinetic study revealed increased rate constant in combined process (PFO, 0.0194 min<sup>-1</sup>) compared to individual process (photofenton, 0.0120 min<sup>-1</sup>; ozonation, 0.0112 min<sup>-1</sup>). Presence of inorganic ions such as nitrate indicated fragmentation of active pesticide structure. Complete removal of parent carbaryl and 86% mineralization was achieved at the end of 180 min treatment with combined processes.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.70(09) [September 2011]|
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