The degradation efficiency of dye using a needle to plate in liquid phase discharge system was investigated. A laboratory scale experiment on dye degradation in pulsed corona discharges was carried out. Effects of operating parameters(such as applied voltage, pH, conductivity and initial concentrati...
The degradation efficiency of dye using a needle to plate in liquid phase discharge system was investigated. A laboratory scale experiment on dye degradation in pulsed corona discharges was carried out. Effects of operating parameters(such as applied voltage, pH, conductivity and initial concentration) and structural parameters(such as electrode gap distance, materials, thickness and type of electrode material, etc.) on the methyl orange degradation were tested. Also, for the application of AOPs such as Fenton process, combination of liquid phase discharge and ferrous iron have been studied for dye wastewater treatment. The experimental results showed that the pulsed discharge process could treat dye wastewater efficiently. The voltage polarity had a large effect on the OH radical emission intensity. Therefore, very long streamer channels and strongest electric field were produced when positive polarity was used. The degradation rate increased with an increase in applied pulse voltage and frequency. The decrease of initial pH enhanced the methyl orange degradation by promoting the generation and selectivity of OH radicals. Therefore, the degradation was more efficient in the acidic solution. The methyl orange degradation was fastest in 50μS/cm conductivity solution, followed by 50 and 200μS/cm, indicating that 50μS/cm was the most favorable in the aspect of radical generation among the experimented conditions. The pulsed corona discharges decreased the pH of solution by producing organic acids and increased conductivity due to charge carriers and organic byproducts generated from methyl orange degraded by discharges. The methyl orange of initial concentration from 20 to 60mg/L was effectively degraded in pulsed corona discharges. The lower initial concentration of methyl orange, the faster degradation was observed. The degradation quantity of initial concentration increased, but degradation slope on discharge time decreased with the increasing initial concentration. And the degradation rate displayed changed under solutions of differing electrode materials and thickness. In addition, the degradation rate in the case of 5 cm gap distance, was characterized by intensity ultraviolet radiation. It was found that the better degradation efficiency occurred using the three needle to plate discharge system, which had more discharge anodes. The combined treatment of pulsed corona discharge with ferrous sulfate addition enhanced the efficiency of methyl orange degrading further, and iron salt addition played a catalysis role primarily in the process of combined treatment. Experimental results showed the existence of optimal iron concentrations(0.3mM) for the methyl orange degradation. The formation of hydrogen peroxide by the pulsed corona discharge was dependent upon both the applied electric field and the solution conductivity. With the addition of iron salt, a synergistic effect was improved in the degradation of various dye.
The degradation efficiency of dye using a needle to plate in liquid phase discharge system was investigated. A laboratory scale experiment on dye degradation in pulsed corona discharges was carried out. Effects of operating parameters(such as applied voltage, pH, conductivity and initial concentration) and structural parameters(such as electrode gap distance, materials, thickness and type of electrode material, etc.) on the methyl orange degradation were tested. Also, for the application of AOPs such as Fenton process, combination of liquid phase discharge and ferrous iron have been studied for dye wastewater treatment. The experimental results showed that the pulsed discharge process could treat dye wastewater efficiently. The voltage polarity had a large effect on the OH radical emission intensity. Therefore, very long streamer channels and strongest electric field were produced when positive polarity was used. The degradation rate increased with an increase in applied pulse voltage and frequency. The decrease of initial pH enhanced the methyl orange degradation by promoting the generation and selectivity of OH radicals. Therefore, the degradation was more efficient in the acidic solution. The methyl orange degradation was fastest in 50μS/cm conductivity solution, followed by 50 and 200μS/cm, indicating that 50μS/cm was the most favorable in the aspect of radical generation among the experimented conditions. The pulsed corona discharges decreased the pH of solution by producing organic acids and increased conductivity due to charge carriers and organic byproducts generated from methyl orange degraded by discharges. The methyl orange of initial concentration from 20 to 60mg/L was effectively degraded in pulsed corona discharges. The lower initial concentration of methyl orange, the faster degradation was observed. The degradation quantity of initial concentration increased, but degradation slope on discharge time decreased with the increasing initial concentration. And the degradation rate displayed changed under solutions of differing electrode materials and thickness. In addition, the degradation rate in the case of 5 cm gap distance, was characterized by intensity ultraviolet radiation. It was found that the better degradation efficiency occurred using the three needle to plate discharge system, which had more discharge anodes. The combined treatment of pulsed corona discharge with ferrous sulfate addition enhanced the efficiency of methyl orange degrading further, and iron salt addition played a catalysis role primarily in the process of combined treatment. Experimental results showed the existence of optimal iron concentrations(0.3mM) for the methyl orange degradation. The formation of hydrogen peroxide by the pulsed corona discharge was dependent upon both the applied electric field and the solution conductivity. With the addition of iron salt, a synergistic effect was improved in the degradation of various dye.
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