The work presented focuses on the leachate from the uncontrolled landfill of the city of Tangier .The massive production of the latter creates risks of soil pollution, rivers and groundwater. It is necessary to collect and treat it before discharging into the natural environment. For this reason, we have conducted a physicochemical and biological characterization of the crude leachate, analyzing the physicochemical and biological parameters of the sample taken from the leachate flowing north.

The results revealed strong mineral filler, metallic, organic and biological. We thought to use several methods of treatment; sand filtration, sawdust filtration, adsorption by chemically activated sawdust using sodium hydroxide 3N and adsorption by powdered clay. We will prove that leachate of Tangier's landfill could be effectively treated using adsorption by powdered clay. The average yield of treatment is influenced by the porosity of clay.