Summary: A foaming apparatus for gas treatment is proposed. Despite a small amount of required liquid, the foaming column can be used not only for polluted gas treatment, but also for a specific type of water and for wastewater purification. In general, the electrical discharge may be applied directly to the foam, partly consisting of pollutant, or before or after the foaming zone or both. In the experiments proposed here, electrical discharge was only used within the foam. Sufficient amounts of various oxidants, high concentrations of hydrogen peroxide (about 50 mg/l), gaseous ozone, dissolved ozone and hydroxyl radicals, were generated using pulse power supply. The reactor was then used for the acetaldehyde treatment and to remove color of wastewaters caused by various pollutants, such as indigo blue, indigo carmine, methylene blue and humic acids.
This works reports on electrical discharge performed in a foaming environment. This new method allows for an effective treatment of polluted gas by contacting the large streams of gas with small amount of liquid. The possibility of generation of oxidants in the foaming column was examined. Hydrogen peroxide (HzOz), hyboxyl radicals and the small amount of ozone were generated in the foam. It was possible to obtain 40 mg~z02/dm3 at 14.5 kV of applied voltage and 5 dm3/min oxygen substrate gas flow. In case of air the maximum concentration was 35 m g~~0~/ d m 'in the same applied voltage and gas flow conditions.
The effect of electrode rotation on the ozone generation process is presented. An ozonizer with an electrode rotating system might be one possible way to increase ozone-synthesis efficiency. The research presented shows that with electrode rotation the ozone-generation efficiency increases by about 15% compared to an ozonizer with a non-rotating electrode; discharge also becomes more homogenous.
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