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.
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