This study aimed to evaluate the physical, chemical and biochemical characteristics of the percolate produced by recently collected solid residue (RSU) columns with or without residue layer from building demolition (RCC). For this, the RSU was sequentially conditioned in layers of 0.15 m and 7 kN m-3 density to obtain two columns of 2.47 m height. One of the columns received a RCC 0.30 cm layer, positioned at its base. Samples of the leachate were collected every fifteen days for the following characterization: pH, EC and concentration of TS, TSS, COD, BOD, total N, Ca, Mg, Fe, Mn, Cd, Cu, Zn, Pb, Ni and Cr. The presence of the RCC layer in the columns provided no alterations in EC, but caused a decrease in concentrations of BOD, COD, TOC, TS, TSS, Ca, Mn and Fe in the leachate. Based on high values of pH, organic matter and macronutrient concentrations (N, Ca and Mg) and low concentrations of heavy metals, the landfill leachate for fertirrigation must be considered as a viable form of final disposal of this wastewater.
landfill; leachates; urban residues
