The present work deals with the leachate treatment using the following processes: coagulation-flocculation by alumina sulfate followed by anionic polyelectrolyte, on one hand. This treatment is preceded by a pretreatment using NaOH and KOH. On the other hand, adsorption by bark Alep pine powder and fibers of date palm leaves is used. Monitoring of physicochemical parameters of that leachate gave a pH of 8,46; an electrical conductivity of 18,24mS/cm, an orthophosphate concentration of 0,35mg/l, an oxidability of 125mg O2/l and a turbidity of 252FAU. Pretreatment with precipitation was considered. For treatment by coagulation - flocculation and for the precipitation, Leachate treatment preceded by pretreatment gives better results with optimal doses. Note that the best pretreatment is by soda which gives an optimum turbidity of 54FAU with minimum doses of alumina sulfate. Then, using adsorption for leachate treatment requires the least investment cost. Adsorption with 2g of Alep pine bark/100ml of leachate gave the best results of turbidity.

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