The structure optimization of gas-phase surface discharge and its application for dye degradation |
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Affiliation: | 1. School of Environmental Science & Technology, Dalian University of Technology, Dalian 116023, People's Republic of China;2. School of Electrical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China |
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Abstract: | A gas-phase surface discharge (GSD) was employed to optimize the discharge reactor structure and investigate the dye degradation. A dye mixture of methylene blue, acid orange and methyl orange was used as a model pollutant. The results indicated that the reactor structure of the GSD system with the ratio of tube inner surface area and volume of 2.48, screw pitch between a high-voltage electrode of 9.7 mm, high-voltage electrode wire diameter of 0.8 mm, dielectric tube thickness of 2.0 mm and tube inner diameter of 16.13 mm presented a better ozone (O3) generation efficiency. Furthermore, a larger screw pitch and smaller wire diameter enhanced the O3 generation. After the dye mixture degradation by the optimized GSD system, 73.21% and 50.74% of the chemical oxygen demand (COD) and total organic carbon removal rate were achieved within 20 min, respectively,and the biochemical oxygen demand (BOD) and biodegradability (BOD/COD) improved. |
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Keywords: | gas-phase surface discharge (GSD) structure optimization ozone (O3) dye degradation |
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