| Summary: | 博士 === 國立高雄科技大學 === 工學院工程科技博士班 === 107 === Under neutral pH, the combination of EDTA-Fe and peroxide effectively promotes catalytically oxidative reactions. Under the same dosage and operational conditions, the oxidative effect of EDTA-Fe and peroxide is also superior to the conventional Fenton’s reagents. In addition, this oxidative technique has been patented by Intellectual Property Office of Taiwan. However, two major problems were aimed to be further investigated: the treatment of dyeing wastewater COD and bacterial inhibition. Due to diverse demands and advanced technologies in dyeing industry as well as the global water-saving trend, new techniques for dyeing wastewater treatment are gaining interest. Moreover, considering the growing need of peroxide in bacterial disinfection, the use of a catalyst might be able to reduce the use of peroxide. Because of these reasons, the combination of EDTA-Fe and peroxide must be investigated in detail.
In order to remove the COD of the dyeing wastewater, the EDTA-Fe and peroxide as well as titanium dioxide were separately tested. The enhanced oxidative effect of EDTA-Fe and peroxide was confirmed and further applied in the treatment of the highly contaminated dyeing wastewater from the dyeing bath. On the other hand, various dosages of EDTA-Fe and peroxide were employed to inhibit the growth of bacteria. All the results were summarized into three research manuscripts, namely, “Photo- and chemo-catalytic oxidation of dyes in water”, “Removal of chemical oxygen demand directly from dyeing bath effluent by activated carbon adsorption”, and “Bactericidal effects of oxidative stress generated by EDTA-Fe and hydrogen peroxide”. The main conclusions of these studies include: (1) More than 80% of the acid and reactive dyes were easily oxidized. In case where titanium dioxide was added with UV light, the percent removal of dye increased which indicated the additive nature of these oxidizing reactions. (2) Activated carbon that saturated with COD of the dyeing wastewater could be regenerated by EDTA-Fe and peroxide, which allowed the treatment of the dyeing wastewater COD from the beginning of the contamination. (3) The EDTA-Fe enhanced oxidative effectiveness at neutral pH; therefore, the use of peroxide dosage could be reduced if the same oxidative effectiveness was desired. For more detailed conclusions including dosages, operational conditions, and other parameters, please refer to the three written articles in the text.
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