Study on Degradation and Mineralization of Oxalic Acid by Electrochemical Oxidation Process
| Autor: | Cheng-Hong Liu, 劉政宏 |
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| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 In this study, we utilize electrochemical oxidation process to mineralize 10 mM oxalic acid. It shows great TOC removal efficiency when using Cl- as solution anion, due to the formation of hypochlorite on the anode. Over 95% of TOC is removed to meet 4 mg/L of the standard of drinking water when 2 mM of oxalic acid is treated. In the electrogenerated hypochlorite system, oxalic acid is mineralized into CO2 and H2O without formation of any other intermediates. We also find that the degradation of oxalic acid by electrogenerated hypochlorite is better than the chemical dosage of commercial hypochlorite solution. We also utilize electro-Fenton system to treat oxalic acid. It is found that except for the Cl- oxidized on the anode, the existence of Fe2+ may also be oxidized on the anode. Therefore, the mineralization efficiency of oxalic acid decreases. pH value is a major factor that affect the mineralization efficiency. If the solution pH could be kept at low value, better TOC removal could be reached. In addition, we also calculate the observed reaction constant kobs with different condition of operation. When industrial wastewater is treated, almost 99% of COD could be removed when electro-Fenton process is utilized due to the large amount of Cl- contained in the solution that can oxidize the intermediate. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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