Tratamento de lixiviado de aterro sanitário: estudos preliminares da aplicação de processo de eletrocoagulação e sistemas integrados

Abstract

There is a need for process strategies and integrated systems for sanitary landfill leachate (SLL) treatment. In this regard, the present work preliminarily evaluated the possible application of a pre-treatment with an electrocoagulation (EC) process followed by a post-treatment based on electro-oxidation, configured as follows: (anode/cathode) EC ➝ BDD/Steel and EC ➝BDD/Al. To assess the efficiency of the EC and integrated processes, the removal of Abs. 254 nm, total organic carbon (TOC), and turbidity were investigated. For the best-performing SLL treatment (EC ➝ BDD/Al), the acute toxicity indices (Artemia salina - LC50%) were evaluated, as well as the identification of possible degradation products and/or the formation of contaminants of emerging concern (CECs) using gas chromatography (GC-MS). The main contribution of this research is associated with the preliminary development of an integrated system (EC ➝ BDD/Al) for SLL treatment, achieving results such as 73% TOC removal, 25% total nitrogen removal, an increase in the biodegradability index from 0.18 to 0.35, and the degradation/oxidation of 2,2'-methylenebis[6-(1,1-dimethylethyl)-4-methyl-, which is considered by the scientific community to be a CEC. Therefore, this research presents an emerging possibility for SLL treatment, contributing to reducing the environmental impact caused by incorrect and/or ineffective disposal of SLL in water bodies.