Title: Removal of COD and colour from old-landfill leachate by Advanced Oxidation Processes

Authors: Chavalit Ratanatamskul, Parinya Auesuntrachun

Addresses: Faculty of Engineering, Department of Environmental Engineering, Chulalongkorn University, Payatai Road, Patumwan, Bangkok 10330, Thailand. ' Faculty of Engineering, Department of Environmental Engineering, Chulalongkorn University, Payatai Road, Patumwan, Bangkok 10330, Thailand

Abstract: 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.

Keywords: old landfills; landfill leachate; COD removal; colour removal; AOPs; advanced oxidation processes; ozonation; Fenton reaction; chemical oxygen demand.

DOI: 10.1504/IJEWM.2009.027410

International Journal of Environment and Waste Management, 2009 Vol.4 No.3/4, pp.470 - 480

Published online: 22 Jul 2009 *

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