Aplicação do processo de peroxicoagulação no tratamento de lixiviado do aterro sanitário

Abstract

This work had as objective to evaluate the treatment of landfill leachate (LL) using the Peroxicoagulation process (PC). The PC reactor was built on a laboratory scale in a batch system, consisting on a borosilicate beaker and electrodes composed of four parallel aluminum plates connected to a continuous current source. The experiments were conducted at controlled pH ~ 4 and with the addition of 1,6 L min -1 dissolved air, and the aliquots were removed at electrolysis times of 0, 5, 15, 30, 45, 60, 90 and 120 minutes. A response surface methodology (RSM) was applied to evaluate the best experimental conditions of current intensity (0.7 – 4.3 A) and initial concentration of H 2 O 2 (434.3-1565.7 mg L -1 ). The higher efficiency in the reduction of the parameters Aromatic Compounds in 254 nm and Color in 455 nm was verified in the electrolysis time of 5 minutes, where the best conditions of the reactor were 4.2 A and 432.32 mg L -1 , and obtaining removals of 68 % and 99 %, respectively. The PC process can be considered as a form of treatment of LL to promote the minimization of the environmental impacts caused by the discharge of this effluent into water bodies.