(426c) Advanced Oxidation Processes with DC-Corona Discharge

Abstract

This
contribution presents the results of degradation of organic constituents and non-biodegradable
hazardous pollutants from wastewater and off-gas with DC-Corona discharge. A corona
discharge reactor equipped with brush type discharge electrode was investigated.
The set up consisted of a continuously rinsed tube- type electrostatic
precipitator made of glass. The tube of 1 m net length and 76 mm inner diameter
was equipped with brush electrodes of different brush diameter and wire
diameter. During operation the water film acted as earthed counter electrode.

The
current/voltage data was modeled to develop an adapted correlation for brush
discharge at specific operation conditions. The effect of brush discharge corona
current on formation of oxidizing reagents was investigated and modeled and generation
of the oxidizing reagent ozone, formed through brush discharge was optimized. DC-Corona
discharge with brush type discharge electrodes generates UV-radiation at elevated
operation corona current. The radiation intensity of UV-C radiation was determined.

Degradation
of selected constituents like acetone, EDTA, phenol etc. was recorded for specific
corona current. Degradation rate of selected constituents was higher in the
domain of ozone formation. Complete elimination of acetone and partial
degradation of EDTA and phenol was recorded at a corona current of 0.3-0.45mA.