Tratamento combinado de lixiviado e esgoto sanitário em sistemas de biomassa em suspensão e biomassa aderida

Abstract

The combined treatment of landfill leachate and sanitary sewage in wastewater treatment plants has drawn much interest from researchers in recent decades. In fact, this approach has been intensified in Brazil due to the fact that the formation of leachate lasts for decades after the closure of landfills. In this context, the present work evaluated a biological treatment process combining suspended (activated sludge reactor) and attached (submerged filter using APG support medium) biomass for the treatment of a mixture of synthetic sewage and landfill leachate. The system was operated in ten operating conditions with the following proportion of leachate in the influent mixture: 0%, 0.5%, 1%, 2%, 5% and 10%. The results showed highest proportion of leachate for which good treatment performance was achieved was 2%. For this condition, the removal of COD and ammonium was, on average, 86.7% and 94.7%, respectively. The submerged filter, placed downstream of the activated sludge reactor, proved to be important in the retention of solid from the effluent of the latter, reducing the turbidity of the treated effluent. The effluent of this operational condition was in accordance with the Brazilian legislation for discharging in water bodies.