Pre-treatment of landfill leachate using potassium ferrate(VI)

Potassium ferrate was used in the decontamination of leachate from the landfill in Janczyce, which is part of the Municipal Waste Treatment Plant in Janczyce and has been operating since 2003. The aim of the research is to assess the effectiveness of pre-treatment of landfill leachate with the use of potassium ferrate(VI) (K2FeO4). The potassium ferrate(VI) (K2FeO4) used acts as an oxidant and coagulant. The effects of the K2FeO4 dose, the duration of the oxidation process and pH were modelled. Analysis of the test results indicates a high elimination efficiency for colour and UVA254. The elimination of pollutants measured by the chemical oxygen demand (COD) index is slightly worse. Based on the results obtained, a mathematical model was developed for the oxidation pro-cess of landfill leachate with K2FeO4 as oxidant and coagulant. The best COD elimination results (45%) were obtained for a potassium ferrate(VI) dose equal to 2.0 g center dot L-1, pH = 4.5 and after 90 min of landfill leachate oxidation. The best leachate pre-treatment effects were achieved in terms of colour elimination, where managed to reduce the colour by 97% and UV absorbance by approx. 60% at a potassium ferrate(VI) dose equal to 4.5 g center dot L-1 and, pH = 5.01 and landfill leachate oxidation duration of 60 min.