Evaluation of toxicity of anaerobic and aerobic microorganisms of landfilm leach and effluent produced by the fenton process

• Main Authors: Oliveira, Elaine Gurjão de, Leite, Valderi Duarte, Albuquerque, Maria Virgínia da Conceição, Lopes, Wilton Silva, Sousa, José Tavares de, Ramos, Railson de Oliveira, Rodrigues, Roberta Milena Moura, Costa, Evelyne Morgana Ferreira
• Format: Article in Journal/Newspaper
• Language: Portuguese
• Published: Sustenere Publishing 2021
• Subjects: Urban solid waste; Toxicity; Advanced oxidative process; Biochemical potential of methane; Resíduos sólidos urbanos; Toxicidade; Processo oxidativo avançado; Potecial bioquímico de metano; Fenton; Beluga; Beluga*
• Online Access: http://www.sustenere.inf.br/index.php/rica/article/view/6077

In this work, the toxicity of anaerobic and aerobic microorganisms from the Fenton process effluent applied to the treatment of leachate from the sanitary landfill (LAS) was studied. The leachate used was collected at the metropolitan landfill in the city of João Pessoa (PB). After collection, the substrate was transported to the Experimental Station for Biological Treatment of Sanitary Sewage (EXTRABES) for chemical characterization, taking into account the quantification of organic and nitrogenous material and other parameters, taking as reference the analytical methods recommended by APHA (2012). Toxicity tests to anaerobic microorganisms from landfill leachate and effluent from the fenton process were carried out following the methodology proposed by Angelidaki et al. (2009), the Biochemical Methane Potential (BMP). The evaluation of the toxicity of the 'in natura' leachate and the effluent from the fenton process to aerobic organisms was determined by the reduction of the oxygen consumption rate (TCO), using an open-type Beluga respirometer and semi-continuous aeration. After performing the fenton process, removal efficiencies of 96.4% of the color, 85.3% of the total COD and 41.7% of the Abs54 were observed. In the results from the BMP tests, it was found that the percentages of 4, 6, 8 and 10% of the effluent from the fenton process added to the substrate, providing inhibition levels above 50% in the production of biogas in relation to the control with period of 40 days of monitoring, confirming the toxic potential of LAS even after oxidative treatment. Only in the tests carried out with 2% of LAS added to the substrate, no inhibition was observed, as 122 mL.N.biogas.gCOD-1 was produced. In the tests carried out with 'in natura' LAS, the production of biogas was about 5.3 times lower. Regarding aerobic microorganisms, no decrease in TCO was observed, there was an increase in TCO of 2.15 and 6.94 mgO2.L-1.h-1 for the tests with application of 2 and 10% of fenton effluent, respectively. It was concluded ...