Feeding preparation strategy for the supercritical water oxidation (SCWO) system for disposing of liquid hazardous waste

Supercritical water oxidation (SCWO) technology has a great potential application for the disposal of liquid hazardous wastes. The feeding process is vital for the safety and normal operation of SCWO. This paper describes the feeding preparation strategy of SCWO with multilevel grouping and programming. Based on the physicochemical properties, the liquid hazardous wastes from various industrial manufacturers were first grouped into acid, neutral and alkaline groups. By mixing between samples, the primary grouping tanks were determined to be acid, alkali, amphoteric reacting, organic and organic high-chlorine liquid wastes. By distributing acid, alkali, amphoteric reacting liquid wastes into organic wastes, three parallel feeding routes are regulated for the homogenizing tank phase, which avoids the reaction between wastes. By calculating with the linear programming optimization model of MATLAB, the waste compatibility ratio of each feeding route was determined to meet the feeding requirements of SCWO. The feeding preparation strategy of this paper provides a practical instruction for the SCWO design and operation. HIGHLIGHTS Supercritical water oxidation (SCWO) technology has great potential application for the disposal of liquid hazardous wastes.; This paper describes the feeding preparation strategy of SCWO with multilevel grouping and programming.; The feeding preparation strategy of this paper provides a practical instruction for the SCWO design and operation.