Keywords: old landfills, landfill leachate, COD removal, colour removal, AOPs, advanced oxidation processes, ozonation, Fenton reaction, chemical oxygen demand
Removal of COD and colour from old-landfill leachate by Advanced Oxidation Processes
This research aims to apply Advanced Oxidation Processes (AOPs) using ozonation, combined O3/H2O2 and Fenton reaction for simultaneous COD and colour removal from old-landfill leachate. The efficiencies of the AOPs for both COD and colour removal could be ranked in this order; Fenton reaction > O3/H2O2 > O3. The Fenton reaction, operated at pH 3 could significantly remove more than 85% of colour and 80% of COD from the leachate. Fenton reaction could also enhance biodegradability of the old-landfill leachate. Moreover, the reaction rates of these AOP processes for COD and colour removal were found to follow the second-order kinetics.