Avaliação do tratamento de percolado de aterro sanitário pelo processo de peroxicoagulação eletroquímica utilizando eletrodos híbridos de ferro e alumínio

Abstract

The decomposition of residues in landfills generates a dark colored liquid known as leachate, which has in its composition harmful pollutants to the environment. Advanced electro- oxidative processes are presented as a form of treatment of this effluent mainly due to the degradation capacity of these compounds. This work consists of an investigation about the treatment of the leachate by means of the process of electrochemical peroxicoagulation (EPC) using a hybrid electrode composed of two aluminum plates and two plates of iron. A response surface methodology (RSM) based on 10 experimental runs was used, considering the initial concentration H 2 O 2 (mg L -1 ) and current intensity (A) as independent variables, the variables being response to % removal of 254 nm absorbance and turbidity. The pH of the solution was kept constant ~ 4, at an air addition rate of 1.6 L min -1 . The best EPC process conditions were observed in 1283 mg H 2 O 2 L -1 and current intensity of 1.6 A, obtaining 83.2% removal for absorbance and 91.3% for turbidity at electrolysis time of 60 minutes. Within this proposal, it is possible to point out that PCE presented an efficient technique and with prospects of minimizing the environmental impacts caused by the discharge of landfill leachate into water bodies, in compliance with current legislation.