The suitability of catalytic supercritical water oxidation (SCWO) technology for oily wastewater treatment is investigated. The effect of temperature, reaction time, oxygen excess, etc. on the extent of water purification is evaluated. The use of Cu2+, Mn2+, and Co2+ salts as catalysts accelerates the reaction and ensures a satisfactory level of water purification at temperatures as low as 380A degrees C. The chemical oxygen demand (COD) decreases by more than 90% in the presence of Cu2+. Mn2+ and Co2+ are also fairly effective wastewater treatment catalysts. On the whole, CSWO is a highly effective process for removing organic compounds from oil wastewaters.