Reducción de la carga contaminante de lixiviados producidos en el relleno sanitario de El Inga mediante el proceso de oxidación química con peróxido de calcio

Abstract

The final disposal of urban solid waste in landfills, generates a large number of leachates with a high pollutant load, causing severe environmental impacts such as the affectation to the quality of surface and underground water, so it is of great importance that they are adequately treated. Currently, in the Sanitary Landfill of El Inga, leachates are treated through physical processes of flocculation, coagulation, sedimentation, filtration, as well as a parallel process of reverse osmosis. These processes are highly expensive and present difficulty in complying with the standards established by current environmental regulations. In the present investigation, a chemical treatment of leachate from pool 13 of the landfill is proposed, using the process of chemical oxidation with calcium peroxide as a possible solution to reduce the contaminant load of COD, BOD, nitrates, nitrites, ammoniacal nitrogen parameters, sulfur, and allow them to approach the value of environmental legislation. Initial data of COD of 5112.9 ppm and BOD of 718.3 ppm were obtained after the treatment. An efficiency of 33.47% reduction was obtained with the first peroxide concentration and 57.45% with the second COD concentration. While for BOD, an efficiency of 0.15% and 93.53% respectively was obtained. The efficiency percentages reveal that the oxidative treatment decreases the pollutant load and can be used as a pretreatment for leachate.