OTIMIZAÇÃO DO PROCESSO DE OXIDAÇÃO ELETROQUÍMICA DE POLUENTES ORGÂNICOS ATRAVÉS DE ELETRODO DE DIAMANTE DOPADO COM BORO

Abstract

The tanning industries, known for their large job creation and significant financial transfer, cause a high environmental impact on water resources due to the large number of pollutants present in their effluents. Advanced treatment methods, as well as advanced oxidation processes, are considered a viable alternative for this type of effluent. However, there is a need to further improve these processes, through experimental planning methodologies, focusing on maximizing pollutant removal and minimizing expenses during treatments. In this scenario, the main objective of this study is to evaluate and improve the electrochemical oxidation process using boron-doped diamond (DDB) electrodes specifically for the efficient handling of organic toxins. As a representative of these polluting substances, the azo dye Acid Black 2 (AB2) was selected as the focus of manipulation. Furthermore, the effectiveness of the process will be evaluated through key indicators, including reduction in Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC), using Taguchi's experimental design for optimization. Furthermore, investigate the influence of operational factors and the toxicity of the generated effluent. The use of the electro-oxidation process was efficient in the initial experiments, removing 95.7% of AB2, 97.4% of COD and 83.62% of TOC and improved after optimization, reaching up to 100% removal of AB2 and causing the energy consumption values for all removal responses. Furthermore, the occurrence followed second-order kinetics for optimized treatment and effluent toxicity after electrochemical oxidation did not increase.