Title :
Degradation of indigo carmine using bipolar pulsed dielectric barrier discharge (DBD) in the water-air mixture
Author :
Ruo-bing, Zhang ; Guo-feng, Li ; Wu Van
Author_Institution :
Ins. of Electrostal, & Special Power, Dalian Univ. of Technol, China
Abstract :
Oxidative decolonization of indigo carmine by bipolar pulsed DBD in the water-air mixture was studied using the dynamic UV-Vis spectrum of the solution. Effects of various parameters such as gas flow rate, solution conductivity, pulse repetitive rate and etc., on color removal efficiency of dying wastewater were investigated. Concentrations of gas phase O3 and aqueous phase H2O2 under various conditions were measured. Experimental results show 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. Decolonization 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 Cp are favorable for the decolonization process. Ozone and hydrogen peroxide formed decreases with the increase of initial solution conductivity. In addition, preliminary analysis of the decolonization mechanisms is given.
Keywords :
discharges (electric); gas mixtures; liquid mixtures; wastewater; water treatment; H2O2; air aeration; aqueous phase; bipolar pulsed dielectric barrier discharge; color removal efficiency; dying wastewater; dynamic UV-Vis spectrum; gas flow rate; gas phase; indigo carmine; oxidative decolonization; pulse capacitor; pulse repetitive rate; solution conductivity; water-air mixture; Chemical compounds; Conductivity; Degradation; Dielectrics; Electrodes; Inductors; Plasma chemistry; Plasma properties; Steel; Water pollution;
Conference_Titel :
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE
Print_ISBN :
0-7803-8486-5
DOI :
10.1109/IAS.2004.1348415