Water Treatment by DC Diaphragm Discharge

conference paper

English

Electrical discharges generated in liquid phase are commonly used for the removal of various organic compounds from water. This contribution presents results obtained from the investigation of the diaphragm discharge created by the application of DC non-pulsed high voltage up to 2 kV. Water solutions containing selected organic dyes and some additives such as electrolytes were treated by the discharge and destruction of organic molecules was studied. Spectroscopic methods, particularly absorption and optical emission spectroscopy were used for determination of dye concentration and plasma diagnostics. Influence of discharge conditions and solution properties on the dye removal was investigated. The diaphragm discharge is created in a small pin-hole in the dielectric diaphragm which is placed between two high voltage electrodes. When the DC voltage is used plasma streamers propagated from the hole towards each side electrode differ especially in their propagation velocity and energy distribution. Due to this phenomenon, processes occurring in the solution on each side of the diaphragm also run in different velocity. The work compares the dye decomposition on both sides of the diaphragm, as well as the dependence of the dye destruction on initial solution conductivity and power supplied to the reactor. Influence of iron and selected electrolytes added to the dye solution on the dye removal was studied, too.

diaphragm discharge, water treatment, dye decomposition

STARÁ, Z.; PROCHÁZKOVÁ, J.; KRČMA, F.

2006

6. 12. 2006

FCH VUT

Brno

80-214-3320-5

The Seventh European Meeting on Environmental Chemistry, EMEC7, Book of Abstracts

139

139

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