Uso de geobag como unidade integrante do sistema de tratamento de lixiviado de aterros sanitários: estudo de caso no aterro sanitário de Rio das Ostras, RJ.

Abstract

The aim of the study was to evaluate the landfill leachate treatment process combined with sludge septic using geobags. Were conducted campaigns in Rio das Ostras landfill, where were collected samples of raw leachate, from the pond where it is mixed leachate and septic, which is the geobags affluent, the geobags effluent, the wetland affluent and wetland effluent. All the samples were submitted to physicochemical analysis (pH, conductivity, COD, DOC, ammonia, serial solids) and toxicity test with test organisms belonging to three different trophic levels (Danio rerio, Daphnia similis and Aliivibrio fischeri). In addition, clotting test was performed with the same polymer used in landfill and batch test with the sludge inside the geobag. The found results showed a 90% reduction in COD parameter, to 97% suspended solids and 52% for DOC after treatment by geobag. A reduction in toxicity to Daphnia similis and Danio rerio when the leachate was mixed with septic sludge was observed. To Aliivibrio fischeri, there was a reduction in toxicity in the effluent geobag. These results showed that the potential for using the geobag as part of leachate treatment systems, considering the specificity of the study (combined treatment with septic sludge), can contribute to solving one of the major environmental problems arising from landfills in medium and small municipalities.