Purification of high conductive liquid using gas-liquid phases discharge reactor

Water purification by streamer discharge using pulsed power generator under the high conductivity water containing pollutants has been investigated. A gas-liquid separated reactor was developed to treat high conductive solution. A wire electrode was placed in the gas phase and a plane electrode was immersed in the water. The pulsed high voltage generated by six stacked Blumlein line was applied to the wire electrode to generate streamer discharge in gas phase, which propagated into the air bubble injected into the water. Indigo carmine solution was employed as a specimen. Natrium chloride was used to adjust the solution conductivity in the range from 10 to 30000 ¿S/cm. The solution of 30000 ¿S/cm conductivity was successfully decolorized at energy efficiency of 75 mg/Wh. Some species of gas such as air, oxygen, nitrogen and argon was injected to clarify dominant reactions of the decolorization. The result showed that the ozone produced by gas phase discharges mainly contributed to decolorize the solution. The decolorization rate depended on chloride ion supplied from natrium chloride by scavenging of hydroxyl radical and on copper ion eluted from the plane electrode by redox reactions like Fenton reactions.