ABSTRACT
Studies in landfill covers have been done in order to control CH4 emissions across layers without compromising leachate generation. The purpose of this paper is to present preliminary Landfill gas (LFG) emission investigation and infiltration conducted in three different cover layers in an Experimental Cell at Muribeca’s Landfill in Brazil: Methanotrophic Layer (mix clay/compost layer), Capillary Barrier Layer (clay/gravel layer) and Conventional Layer. Results show that capillary barrier has major capability to retain biogas because of the distribution gravel layer below the soil layer and saturation maintenance above air incoming point in most of the observation period. Methanotrophic cover layer followed the same emission probably pattern due to methane oxidation. On the other hand, conventional layer was more efficient for minimizing infiltration than the other two, and the capillary barrier presented much higher infiltration in periods where the rainfall was greater than 25 mm in 3 days.
