Decontamination of Wastewater Containing Acetone by Continuous Supercritical Water Oxidation

This study was conducted to investigate the destruction removing efficiency (DRE) of wastewater containing acetone by supercritical water oxidation (SCWO). A 200mL Inconel 625 reactor with continuous flow of pressurized hot water was used in this study. The experimental conditions were controlled at sub- and supercritical state of water. Reactor's temperature was set in the ranges of 350~480� and pressure in between 23~27Mpa. The DRE of acetone depended upon both reactor temperature and acetone concentration. The DRE was evaluated by the removal efficiency of chemical oxygen demand (COD) and total organic carbon (TOC) of acetone solution. Acetone at the 4~15% (v/v) and reaction temperature at 350�, the COD and TOC removal are around 40~60%. As reaction temperature raise to 480�, the DRE of TOC and COD were �98%. For SCWO system presently used in our lab, optimum concentration for acetone destruction were in between 8~10%. Higher reaction temperature will be helpful to promote DRE. As reaction temperature above the auto ignition temperature 465� of acetone, oxidation of acetone could be greatly enhanced and resulted in highly destruction efficiency by SCWO.