Degradation of high-concentration simulated organic wastewater by DBD plasma

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Abstract
In this study, the high-concentration simulated organic wastewater by dissolving methyl violet in water was degraded using dielectric barrier discharge (DBD) plasma generated in air and O2 respectively. The decoloration rate and chemical oxygen demand (COD) of wastewater were evaluated during plasma treatments with the initial concentration of methyl violet of 300 mg L−1. Results showed that the highest decoloration rate of around 100% within 10 mins and the highest COD decrease by 33% within 60 mins could be achieved with the O2 plasma treatment at the discharge voltage of 10 kV, while air plasma treatment shows lower efficiency in decolorizing the methyl violet solution and lower COD decrease (24%) after 60 mins-treatment. UV-Vis and chemical analysis of generated by-products during plasma-enabled degradation process revealed that the methyl violet molecules could be completely decomposed into some refractory organics in the solution. Based on the experimental results and literature review, a pathway of methyl violet degradation attributed to energetic electrons and highly reactive species generated by DBD was proposed.
Funding Information
  • National Natural Science Foundation of China (Grant Nos. 11565003 and 11665005)
  • Natural Science Foundation of Jiangxi Province (Grant Nos. 20181BAB201018)
  • Post-Graduate Innovation Funds of Jiangxi Province (YC2018-S395)

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