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.