Treatment of landfill leachate by Fenton and plasma technologies

Advanced oxidation processes, namely photo-Fenton, Fenton-like, Fenton and UV/H202 and plasma have been investigated for the removal of organic matters from landfill leachate. Fenton's oxidation was the most effective and the most effective ratio 1/10 (Fe2+/H202) COD removal reached 50-80% and the biodegradability increased by 40 to 60 %. The oxidation batch treatment was performed on different synthetic leachate concentration and two types of doses:(single and triple 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. The COD removal of domestic landfill leachate and a glucose based-synthetic one as a function of the operating variables (H202, Fe2+, Ti02 , UVand Plasma) led to results that ranged between 30% and 90% while the removal efficiencies decreased in the order: photo-Fenton > Fenton-like > Fenton > UVIH202, > UV. Fenton process however generated an important quantity of iron sludge which will require further disposal. The advanced plasma process which relies on cold liquid plasma as source of light for radical productions was used as a new technique to treat landfill leachate solutions. The efficiency of single plasma process and its combination with conventional Fenton catalytic process as an integrated process on COD removal were investigated. The experimental procedure was carried out in a bench-scale continuous stirred tank catalytic reactor where the plasma unit probe was immersed in the liquid phase generating periodic pulses for various periods of time. The process involved the use of both Fe2+ catalyst and hydrogen peroxide while the plasma process required an additional NaCl diluted solution to promote the electrolysis by increasing the conductivity of the operating solutions.EThOS - Electronic Theses Online ServiceGBUnited Kingdo