Degradation of landfill leachate using transpiring-wall supercritical water oxidation (SCWO) reactor

Abstract

Oxidation of landfill leachate wastewater was studied in a transpiring-wall SCWO reactor, operated under varied temperature and pressure 320-430 °C, 18-30 MPa. Effect of temperature and pressure on COD and BOD removal efficiency was investigated. COD and BOD removal efficiency being 99.23%, 98.06% were achieved at 430 °C, 30 MPa, which increased with temperature and pressure. The modified pseudo first-order rate model was regressed from experimental data, taking into account the induction time (t(ind)) effect. The resulting pre-exponential factor A and activation energy E(a) were 34.86 s(-1) and 32.1 kJ mol(-1), respectively, assuming that the reaction order for feed wastewater (based on COD) and oxidant were first order and zero order, respectively.