Plasma induced degradation of Indigo Carmine by bipolar pulsed dielectric barrier discharge (DBD) in the water-air mixture

Article type: Research Article

Authors: ZHANG, Ruo-bing | WU, Yan | LI, Guo-feng | WANG, Ning-hui | LI, Jie

Affiliations: Institute of Electrostatic and Special Power, Dalian University of Technology, Dalian 116024, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: Degradation of the Indigo Carmine (IC) by the bipolar pulsed DBD in water-air mixture was studied. Effects of various parameters such as gas flow rate, solution conductivity, pulse repetitive rate and ect., on color removal efficiency of dying wastewater were investigated. Concentrations of gas phase O_3 and aqueous phase H_2O_2 under various conditions were measured. Experimental results showed that air bubbling facilitates the breakdown of water and promotes generation of chemically active species. Color removal efficiency of IC solution can be greatly improved by the air aeration under various solution conductivities. Decolorization efficiency increases with the increase of the gas flow rate, and decreases with the increase of the initial solution conductivity. A higher pulse repetitive rate and a larger pulse capacitor C_p are favorable for the decolorization process. Ozone and hydrogen peroxide formed decreases with the increase of initial solution conductivity. In addition, preliminary analysis of the decolorization mechanisms is given.

Keywords: water treatment, water-air mixture, DBD, Indigo Carmine

Journal: Journal of Environmental Sciences, vol. 16, no. 5, pp. 808-812, 2004