Experimental Investigation of Electrical Discharge Plasma in Air Microbubbles Water Mixture

Abstract

This research focused on studying a DC plasma discharge underwater with mixed high-density of air micro-bubbles water by experimental research for generating of free radicals and highly chemically active species in the activated water. The simple laboratory-made high voltage DC power supply based on half wave rectifier of voltage doubler circuit of 12 kVp. A point-to-point electrode setup was immersed in the water. Electrical DC-discharge plasma though micro air-bubbles water was investigated by current and voltage probe. The yields from electrical discharge plasma in the water were measured by detecting of pH, conductivity, ozone (O3), nitrate (NO3-), and hydrogen peroxide (H2O2). During underwater discharge plasma with mixture of micro air-bubbles in water condition, the maximum voltage and current were applied approximately 5 kVp and 1 Ap, respectively. The chemically reactive species concentrations of water were measured as a function of treatment time for 4 minutes. The results shown that O3, H2O2 and N03-obtained more than 5 mg/L, 25 mg/L, and 90 mg/L, respectively. Moreover, the discharge plasma with the air micro-bubbles water presented significantly correlation between chemical active species production and the input energy transfer.