Supercritical water oxidation (SCWO) was a promising technology for treatment organic-containing wastewater. When exceeding critical point of water (Tc = 374℃; Pc = 22.1MPa), the values of density, dielectric constant, hydrogenous bond and ionic product of water drop down, so supercritical water acts as a non-polar solvent of high diffusivity and excellent transport properties. Consequently, even non-polar organic compounds and gases like oxygen become completely miscible with the supercritical f...