Fenton's catalytic oxidation process to treat landfill leachate

Many types of advanced oxidation processes (AOPs), namely Fenton (Fe 2+ /H2O2) with different doses, Fenton-like (UV/Fe 2+ /H2O2), photo-Fenton (Fe 2+ /H2O2/TiO2), and plasma technology have been investigated for the removal of organic matters (COD content) from landfill leachate. Fenton's oxidation was the most effective as the most effective ratio 1/10 (Fe 2+ /H2O2) which allow the COD removal reached 50-80% and the biodegradability increased by 40 to 60 %. The leachate was characterised by high COD, the synthetic feed to simulate the composition of domestic landfill leachate which the main source of COD is the Glucose. The oxidation by batch treatment was performed on different synthetic leachate concentrations and two types of doses: (single, triple and high) Fenton‟s reagents. The first single Fenton‟s reagent removal efficiency of COD was less than those of a triple Fenton‟s reagents for all tested leachates under similar operating conditions. But the removal efficiency of COD by using the high dose of Fenton regent was the highest percent which remove up to 90% of original COD. The COD removal of domestic landfill leachate and a glucose based-synthetic one as a function of the operating variables (H2O2, Fe 2+ , TiO2, UV (400watt) and Plasma technology) led to results that ranged between 30% and 90% while the removal efficiencies decreased in the order: Fenton of high dose > Plasma > Fenton of triple dose > Fenton of single dose > photo-Fenton > Fentonlike > UV/Fe 2+ /H2O2. Fenton process however generated an important quantity of iron sludge which will require further disposal, when performed under optimal COD removal conditions.