Aqueous 1-naphthol Decomposition by DC Water Plasma at Atmospheric Pressure

Water thermal plasma is one of the effective methods to decompose persistent organic pollutants in waste liquid At present work, the decomposition of high concentration 1-naphthol in direct current (DC) water plasma was investigated. The experimental results showed that the major gaseous effluents were H2 (42.1—50.4%), CO2 (11.7—15.2%), CO (3.9—76%), CH4 (0.01—0.15%) and the content of the syngas was over 49.6%. The gas temperature was 5500 K under the condition of current at 7A and intial concentration at 500 mg/L. The decomposition efficiencies of 1-naphthol, COD and TOC were increased with the increase of the current (6A—SA). The maximum decomposition efficiency of 1-naphthol was over 99.5% at the current of 8 A. The higher initial concentration can lead to lower 1-naphthol degradation. This study provided an experimental analysis for the application of water vapor plasma technology in treatment of high concentration organic wastewater.