Influence of the Diameter of the Infiltration-Percolation Column on Sand in the Treatment of Leachates from the Grand Agadir Landfill
Analyses of the stabilised leachate collected from the landfill revealed high levels of biodegradable organic matter (COD varies between 8971 and 26451 mg O2/L and BOD5 varies between 1181 and 2451 mg O2/L) and mineral matter (conductivity varies between 79 and 105.2 mS/cm). This study focuses on the treatment of stabilised leachate from the Greater Agadir landfill (Morocco) using the infiltration percolation technique on filters of the same height 200 cm and different diameters 11, 16 and 20 cm filled with raw titaniferous sand (TFS). Through this study, it appears that the leachate from the city is loaded with organic and mineral matter. The results of the leachate infiltration on these columns show that the decrease of these parameters is inversely proportional to the diameter and that there is a discolouration and a decrease in turbidity, pH and COD and BOD5 and SO42- and NO2- and PO43- . In the 200 cm high and 20cm diameter column, the results show that the reduction rate of turbidity, BOD5, COD, EC, sulphate, nitrite, nitrate, and orthophosphate reached 97.22%, 86.29%, 97.25%, 97.64%, 92.30%, 92.69%, 96.51%, and 92.83% respectively. This treatment technique showed significant purification performance in the removal of organic and mineral matter in the leachate.