| Summary: | 碩士 === 弘光科技大學 === 環境工程研究所 === 105 === Bisphenol A (BPA) is one of the most frequently detected and discussed chemicals with potential estrogenic effects in humans and is categorized as endocrine disruption compounds (EDCs). The major application of BPA is used as intermediate for polycarbonate plastic and epoxy resin productions. The mass production and widely use of plastic products in Taiwan lead to the occurrences of trace BPA in surface water, drinking and industrial effluents which threat human health. Therefore, Taiwan EPA regulates BPA as Class 4 toxic chemicals.
Advanced oxidation processes (AOPs) have been investigated broadly for wastewater treatment. Main processes discussed are UV/H2O2, ozonation, UV/TiO2, UV/ZnO and Fenton reaction, etc. Because BPA causes major environmental problem, properly treatment of BPA is very important.
In this work, four AOPs such as UV/H2O2, UV/persulfate, Fe2+/persulfate and heat/persulafte have been investigated to utilize hydroxyl and sulfate radicals to effectively degrade BPA and mineralize total organic carbons (TOC). The operating parameters such as hydrogen peroxide dosage, persulfate dosage, ferrous dosage, temperature, UV energy are evaluated to find optimal conditions. The pseudo first order rate constants, energy consumption, and inhibition effect are included to evaluate four AOPs. The results show that BPA in wastewater can be effectively degraded. The TOC is mineralized in different tendency dependent on process type. UV/persulfate presents the highest rate constant and Fe2+/persulfate shows the lowest energy consumption. Anions such as chloride, sulfate and nitrate in wastewater show no significant effect on BPA degradation in UV/H2O2 as well as UV/persulfate processes. The sulfate radical is the major oxidation species contributed to the BAP degradation observed from scavenger study.
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