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오태협,이한욱,박성직,박재우,Oh, Tae Hyup,Lee, Hanuk,Park, Sung Jik,Park, Jae-Woo 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
Fenton is the reaction using the OH· radicals generating by interaction between hydrogen peroxide and Fe<sup>2+</sup> which can oxidize the contaminants. Fe<sup>2+</sup> ions are oxidized to Fe<sup>3+</sup> ions by reaction with H<sub>2</sub>O<sub>2</sub> and formed OH· radicals. UV-Fenton process includes the additional reaction that generates the OH· radicals by photodegradation of H<sub>2</sub>O<sub>2</sub>. In methylorange (MO) decolourization experiment with UV-Fenton, optimal Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio was obtained at 1 : 10. Based on the obtained condition (H<sub>2</sub>O<sub>2</sub>= 10mM, Fe<sup>2+</sup> = 1 mM) with/without UV-fenton experiment was carried out. Removal efficiency and sludge production were measured at 30 min. The case of w/o UV irradiation and only H<sub>2</sub>O<sub>2</sub> was hardly treated and only Fe<sup>2+</sup> showed 65% removal owing to coagulation. When UV-Fenton process in optimal ratio (Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> = 1 : 10), UV irradiation showed better removal efficiency than of w/o UV irradiation. Also, MO decolourization was a function of the hydrogen peroxide concentration (x<sub>1</sub>), Fe<sup>2+</sup>:H<sub>2</sub>O<sub>2</sub> ratio (x<sub>2</sub>), and numbers of UV lamp (x<sub>3</sub>) from the application of the response surface methodology. Statistical results showed the order of significance of the independent variables to be hydrogen peroxide concentration > numbers of UV l amp > Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio.