Decomposition of Persistent Organics in Water Using a Gas–Liquid Two-Phase Flow Plasma Reactor

Decomposition of Acetic Acid Using Multiple Bubble Jets with Pulsed Electrical Discharge

“…The net energy efficiency by subtracting heat loss in a solution was 0.36-0.73 (g TOC /kWh) in this experiment showing comparable value. The modified energy efficiency based on gap voltage in previous work are 1.1 (g TOC /kWh) for dielectric barrier electrode and 2.2 9 10 -2 (g TOC /kWh) for pin-plate electrode systems respectively, using an Ar gasliquid two phase flow [3]. Furthermore, the comparison of conventional energy efficiency with other similar works on acetic acid decomposition for different systems was made.…”

“…Recently, the advanced water treatment technology using electrically discharged gas bubbles with strong oxidizing ability has been intensively investigated to achieve the decomposition of persistent harmful substances in liquid-phase plasma [2]. The direct injection of O and OH radicals, which are generated by pulsed electrical discharge within gas bubbles, into the solution to be decomposed, is a very short time chemical decomposition process for improving energy efficiency [3,4]. This is because the oxidation potential of O and OH radicals is higher than that of O 3 at atmospheric pressure, although the lifetime of O and OH radicals is shorter than that of O 3 in water.…”

Decomposition of Persistent Organic Compounds in Water Using Pulsed Discharge on Water

“…OH in the ground state is known to be converted to hydrogen peroxide and water by the following reactions of OH groups [4,7]: The acetic acid in solution appears to have been decomposed by OH in the ground state generated above the water and on the water surface by the discharge.…”

“…Katayama and colleagues measured OH in the ground state by a laser-induced fluorescence technique, and discussed the difference in the amount of decomposition of acetic acid in discharges in Ne versus Ar [4]; for the present research as well, such measurements must be performed in the future. However, in this discussion, the number of OH radicals in the ground state is considered in terms of data on the emission intensity due to the transition from an excited state and the hydrogen peroxide concentration, and actual measurement of OH in the ground state has not been performed.…”

Characterization of a Multiple Bubble Jet With a Streamer Discharge

“…I N recent years, a great deal of interest has been shown in the application of electrical discharges in bubbling water to oxidize persistent harmful contaminants using O and OH radicals [1]. The direct injection method of O and OH radicals into the solution, which are produced by a streamer discharge in bubbles, is very effective in improving the decomposition efficiency in liquid, because these radicals have a very short lifetime in atmospheric air and oxygen [2].…”