Dimensionamento de sistema de tratamento de lixiviado de aterro sanitário com ênfase na eficiência de remoção de DBO e DQO.

Abstract

This work aimed to propose and design an integrated system for the treatment of landfill leachate, aiming for high efficiency in pollutant removal and compliance with environmental legislation. The system consisted of screening, a homogenization tank, an anaerobic lagoon, a facultative lagoon, activated sludge, a secondary clarifier, and polishing ponds, using hydraulic and kinetic criteria consolidated in the literature. The results demonstrated high overall efficiency, with 98.84% removal of BOD and 95.28% of COD, reducing concentrations to 31.17 mg·L⁻¹ and 332.69 mg·L⁻¹, respectively. The activated sludge system stood out as the main stage of degradation of the remaining organic matter. It is concluded that the proposed arrangement presented technical coherence and high theoretical performance in leachate treatment, showing potential for real-scale application. However, the removal of recalcitrant compounds, ammoniacal nitrogen, and metals may require complementary processes in more restrictive scenarios.