Degradation of 1,4-dioxane in water using activated persulfate by different electrodes

• Main Authors: WANG,CHING-HSIANG, 王靖翔
• Other Authors: CHEN, Ku-Fan
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/bpje67

碩士 === 國立暨南國際大學 === 土木工程學系 === 107 === In recent years, electrochemical persulfate oxidation has been applied to the treatment of organic pollutants in wastewater. However, the mechanisms of the removal of pollutants in the system has not been well studied. In this study, batch experiments were performed to remove 1,4-dioxane and Reactive Black 5 (RB5) by electrochemical persulfate oxidation. The objectives of this study were to： (1) evaluate the activation/reaction of persulfate at different voltages. (2) assess the efficiency of electro-activated persulfate for the degradation of RB-5 and 1,4-dioxane using platinum, graphite, and TiO2 electrodes at different voltages. (3) assess the mineralization of 1,4-dioxane and RB5 degradation by electro-activated persulfate at different voltages. The experimental results of persulfate activation under different voltages show that the decomposition efficiency of persulfate under different voltages was 10 V > 7V > 5 V > 3 V > 1 V. The results demonstrate that the application of voltage can activate persulfate. The RB-5 removal was higher at 10 V than other voltages. The high voltages provided more electrons to the anode that effectively activated persulfate to remove the contaminant. The Pt/Ti electrodes had better performance for 1,4-dioxane degradation than graphite electrodes. When the concentration of persulfate increased to 50 mM, the removal efficiency of 1,4-dioxane by the Pt/Ti electrodes at 10 V reached 99% while the graphite electrodes caused 92% of 1,4-dioxane removal after 240 min of reaction. Electrode areas needs to be increase to enhance the removal of the contaminants in the future. Electrochemical persulfate oxidation is limited by many factors, which may affect the degradation of contaminants. However, this technology still has its potential for application. The results of this study will contribute to the future application of electrochemical persulfate oxidation.