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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (5): 054018.

• THE 8TH INTERNATIONAL CONFERENCE ON APPLIED ELECTROSTATICS •

The structure optimization of gas-phase surface discharge and its application for dye degradation

Ying CAO (曹颖)1, Jie LI (李杰)1,2, Nan JIANG (姜楠)1,2, Yan WU (吴彦)1,2 , Kefeng SHANG (商克峰)1,2 and Na LU (鲁娜)1,2

1. 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
• Received:2017-10-31 Published:2017-12-20
• Supported by:

The authors would like to thank National Natural Science Foundation of China (No. 51477025)

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.