Steam plasma jet for treatment of contaminated water with high-concentration 1,4-dioxane organic pollutants

Abstract

A steam plasma jet (SPJ) by using both water and 1,4-dioxane aqueous solution (DAS) as working medium was injected into contaminated water to decompose 1,4-dioxane. The optical emission spectroscopy analysis showed that the formation of the excited species CH * and C * 2 depended on the concentration of 1,4-dioxane. The influences of SPJ gas temperatures for different working mediums were discussed. The 1,4-dioxane decomposition was enhanced when DAS was used as working medium and SPJ was injected into DAS. Synthesis gas (a mixture of H2 and CO) and CO2 were the main products in gaseous effluents.

Fast propagation of an underwater secondary streamer by the appearance of a continuous component in the discharge current

“…Introduction. -In recent years, discharges in water or on water surface have been studied for application in water treatments because the discharges can decompose organic compounds and inactivate microorganisms in water by the generation of ultraviolet rays, charged particles, and reactive oxygen species [1][2][3]. Especially, pre-breakdown phenomena called streamers in liquids have potential for application in medical treatment because the spatiotemporal scale and the discharge current are very small [4].…”