Ex-situ 화학적 산화처리 적용을 위하여 다양하게 활성화(heat, Fe^2+, UV)된 persulfate를 이용한 TCE 분해에 대한 연구

Abstract

Rreactivity of persulfate (PS) for oxidation of TCE under various conditions such as heat, Fe^2+, and UV was investigated. It was found that degradation rate of TCE increased with increasing temperature from 15 to 35℃. At pH 7.0, the rate constants (k) at 15, 25, 30, and 35℃ were 0.07, 0.30, 0.74, and 1.30 h^?1, respectively. For activation by Fe^2+, removal efficiency of TCE increased with increasing Fe^2+ concentration from 1.9 mM to 11 mM. The maximum removal efficiency of TCE was approximately 85% when pH of the solution dropped from 7.0 to 2.5. Degradation of TCE by UVactivated PS was the most effective, showing that the degradation rate of TCE increased with inreasing PS dosage; the rate constants (k) at 0.5, 2.5, and 10 mM were 34.2, 40.5, and 55.9 h^?1, respectively. Our results suggest that PS activation by UV/PS process could be the most effective in activation processes tested for TCE degradation. For oxidation process by PS, however, pH should be observed and adjusted to neutral conditions (i.e., 5.8-8.5) if necessary Rreactivity of persulfate (PS) for oxidation of TCE under various conditions such as heat, Fe2+, and UV was investigated. It was found that degradation rate of TCE increased with increasing temperature from 15 to 35℃. At pH 7.0, the rate constants (k) at 15, 25, 30, and 35℃ were 0.07, 0.30, 0.74, and $1.30h^{-1}$, respectively. For activation by Fe2+, removal efficiency of TCE increased with increasing Fe2+ concentration from 1.9 mM to 11 mM. The maximum removal efficiency of TCE was approximately 85% when pH of the solution dropped from 7.0 to 2.5. Degradation of TCE by UV-activated PS was the most effective, showing that the degradation rate of TCE increased with inreasing PS dosage; the rate constants (k) at 0.5, 2.5, and 10 mM were 34.2, 40.5, and $55.9h^{-1}$, respectively. Our results suggest that PS activation by UV/PS process could be the most effective in activation processes tested for TCE degradation. For oxidation process by PS, however, pH should be observed and adjusted to neutral conditions (i.e., 5.8-8.5) if necessary.