| Summary: | 碩士 === 輔英科技大學 === 環境工程與科學系碩士班 === 107 === In this study, the wastewater containing Acid Red 18 dye was treated by electro-Fenton process, and the Acid Red 18 was a kind of mono-azo dye. Various operating conditions, such as H2O2 concentration, pH value, applied voltage,electrolyte concentration and type,affected the degradation of Acid Red 18 were discussed. The degradation of Acid Red 18 was described by pseudo-first order reaction kinetics. The dynamic flow reactor was adopted in this study. The materials of cathode and anode plates are stainless steel and graphite, respectively. The Fe3+ species was reduced to Fe2+ in electro-Fenton process, and the additive amount of Fe2+ used in Fenton process decreased, thereby cut down the sludge produced.
In this study, Acid Red 18 concentration (1.65mM), ferrous ion concentration (2.5mM) and reaction time (30min) remain unchanged. According to the results, the degradation of Acid Red 18 is fastest when the concentration of H2O2 is 30mM and the residual concentration is also lowest. The regulation of pH is quite important in electro-Fenton process. When the pH is higher or lower than 3, the degradation rate constant is lower than that at pH3. The appropriate applied voltage in our electro-Fenton system is around 10V. It was found the degradation mechanism depended on applied voltage. When the electrolyte concentration is controlled among 0.2~0.5mM,the higher electrolyte concentration is, the faster Acid Red 18 degrades. For different kind of electrolyte, Acid Red 18 degrades faster in wastewater containing monovalent electrolyte than bivalent electrolyte.
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