Treatment of landfill leachate effluent by chemical coagulation and electrocoagulation: without correction of pH

Abstract

The objective of the present study is to see the difrence between traditional physicochemical process such as chemical coagulation and electrocoagulation process treating a Landfill Leachate effluent. As it's known Leachate is difficult to treat to meet to the discharge standards for its variable composition and proportion of refractory materials. We used Jar test experiments for chemical coagulation, Aluminium sulphate (Al2(SO4)3,10 H2O) as a coagulant, we also perform to compare the removal efficiencies of different pollutants as phenol, nitrate and total organic carbon for each method. Experimental results of electrocoagulation using an aluminum electrode with a current density of 166.6 A/m2 and a residence time of 150 min have shown its important removal capacity as total organic carbon and turbidity were 78.24% and 98 % consecutively, who were better than chemical coagulation results. Furthermore, it can be concluded that the electrocoagulation technique is rapid since the active agents of coagulation are produced as the experiment proceeds.