Trichloroethylene(TCE) was the most common and abundant pollutants in the refractory substances and this was difficult to be degradable by conventional methods. Therefore, a considerable interest has been devoted to developing new process where TCE can be easily decomposed. In this study, the series of ultrasonic irradiation for removal of TCE in aqueous solution has been selected as a model reaction in the batch reactor system in order to obtain the basic data investigate the influence of various experimental parameters such as pH, reaction temperature, and intensity. The products obtained from the ultrasonic irradiation were analysed by GC/MS and UV spectroscopy. The intermediates of ultrasonic irradiation of TCE was identified as Cl₂, HCl, Cl⁻, chloroform, dichloroethene, trichloroethane , and tetrachloroethane. After the ultrasonic irradiation of TCE con - taining aqueous solution for 20 min their pH s were decreased from 7.0 to 2.4 respectively. Further irradiation of this solution did not change their pH values. This can be attributed to the formation of HCl obtained by the reaction between H · radical and Cl⁻ which could be produced by the ultrasonic irradiation of water and reactants containing chlorine. Acidic solution showed a good capability in the degradation of TCE. In general, the rate of reaction is proportional to the reaction temperature obeying the Arrhenius law. However, in the ultrasonic irradiation, this suggests as the reaction temperature increase the decomposition rate of reactant decrease. This result meant that the increase of reaction temperature due to the increase of vapor pressure of water accelerated the decrease of acoustic intensity which was can be proportional to the decomposition rate of TCE solution. It was found that more than 80% of TCE solution was removed within 2 hours in all reaction conditions. The reaction order in the degradation of TCE solution was verified as the pseudo-first order. From the fore-mentioned results, it can be concluded that the refractory organic compounds could be removed by the ultrasonic irradiation with radicals, such as H · and OH · radical causing the high increase of pressure and temperature. Finally, it appeared that the technology using ultrasonic irradiation can be applied to the treatment of refractory substances which are difficult to be decomposed by the conventional methods.
I. 서론
II. 실험장치 및 방법
III. 실험결과 및 고찰
IV. 결론