| Summary: | 碩士 === 臺灣大學 === 環境工程學研究所 === 98 === This study investigated the treatment of dimethyl phthalate (DMP) via various oxidation proesses such as 1) electrochemical oxidation (EC), 2) ozonation (OZ) with EC (EC/OZ), 3) ultraviolet (UV) with EC (EC/UV) and 4) photo ozonation with EC (EC/OZ/UV). The efficiencies of decomposition of DMP (ηDMP) and mineralization of total organic carbons (ηTOC) were evaluated under different operation voltages, pH values and concentrations of applied ozone (CO3, in).
The results showed that ηDMP is about 8% at reaction time (t) of 80 min, under the EC process with EV = 4 V. During the EC/UV process with EV = 4 V, PUV = 100 watts (W), the ηDMP and ηTOC are 47.5 and 11.5%, respectively. These are higher than 30.4 and 5.7% under UV process. However, the ability of oxidation in terms of ηTOC under EC process is too weak. For the EC/OZ process with EV = 4 V and CO3,in = 10 mg L-1, ηDMP and ηTOC are 94.4 and 4.2%, respectively, after t = 80 min. An increase of CO3, in from 10 to 16 mg L-1 further increases ηDMP to 99% and ηTOC to 30% after t = 80 min. As for the EC/UV/OZ process with Ev = 4 V, CO3, in = 10 mg L-1 and PUV = 100 W, the DMP was nearly completely decomposed at t = 60 min, while the ηTOC is 62.7% after t = 80 min. In case of CO3, in increased from 10 to 30 mg L-1, the value of ηTOC raises to 88.3% after t = 80 min.
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