Oxidant Formation and the Decomposition of Organic Compounds in Foaming Systems

Abstract

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.

Organic contaminants removal by the technique of pulsed high-voltage discharge in water

“…Cream was placed at the bottom of the reactor to form foam in bubbling situation. The removal efficiency was improved in the foaming system for low mass transfer resistance and the generation of more hydrogen peroxide and ozone [45]. The electrostatically atomized ring-mesh reactor was consisted of electrostatic atomization part and corona discharge part (Fig.…”

Degradation of Methylene Blue by RF Plasma in Water

“…Pawłet [8] employed the pulse discharge in forming conditions for an AOP and obtained approximately 40 mg/L of hydrogen peroxide after exposing the foam made of pure water (50 mL) to discharge for 5 min. Aoki et al [9] used a electrode-chamber system of dielectric-barrier discharges (DBDs) to generate glow-like plasmas inside bubbles in water, and Ishijima et al [10] investigated multi-bubble plasma generated by intense microwaves from a slot antenna.…”

Water Treatment Using Discharge on the Surface of a Bubble in Water

“…There are many reports for water treatment using electrical discharge in water and discharge characteristics 1–13. A new type of discharge method, which is the discharge inside bubbles in water operating in a bubbled water, has been proposed in order to use not only ozone but also atomic oxygen, OH, and another radicals generated effectively for water treatment 14…”