TREATMENT OF LANDFILL LEACHATE BY OZONATION, ULTRAFILTRATION, NANO FILTRATION AND MEMBRANE BIOREACTOR

This paper reports on the results of landfill leachate treatment with membrane bioreactor (MBR), ultrafiltration, nanofiltration and ozonation. Due to low biodegradability caused by the landfill age, treatment with MBR reduced organic matter by only 23%. Ultrafiltration reduced organic matter by up to 23%, depending on the membrane pore size. Ozonation removed 56% of COD with an ozone dose of 1.24 mg O3/mg COD, but results suggest even higher possible removal with higher ozone doses. Removal of organic matter by ozonation was not complete, since most ozonated organic molecules only changed their form, while only 35% was completely removed from the leachate. With nanofiltration applied as a single process, 91% removal efficiency was achieved and overall efficiency increased to 96% with further ozonation of nanofiltration permeate.