Influence of Elevated Temperature and Pressure on Treatment of Landfill Leachate by Potassium Ferrate(VI)

Abstract The significant problem is the treatment of landfill leachate characterized by high chemical oxygen demand (COD) and total organic carbon (TOC) presence biodegradation inhibitors such as heavy metals oily substances. For case (pH 7.9, color 1550 mg Pt/L, COD 1880 O 2 /L, TOC 620 mg/L, nitrogen (TN) 220 phosphorus (TP) 6 mg/L metals), effect elevated pressure temperature on decrease value potassium ferrate(VI) (K FeO 4 ) was investigated. Taguchi method (TM) employed for optimizing process parameters (repetition, pH, K concentration, time, temperature, pressure). Maximizing criterion function signal-to-noise (S/N), optimal were determined: pH 3.5, 2.0 g/L, time 45 min, 30 °C, 1 MPa. At conditions, a color, COD, TOC, TP above 91%. Additionally, TN 48.2%. Comparatively, at atmospheric (0.1013 MPa) 19 TP, 99.9%, 83.0%, 79.0%, 19.1%, 100%, respectively. Addition may improve compound removal decreases energy consumption in subcritical water oxidation. Graphical abstract