Redução da DQO via tratamento oxidativo avançado em efluente industrial oriundo da síntese de Picoxystrobin

Abstract

Water pollution by organic compounds from human activities, such as industry, agriculture, and urban areas, is a global concern. Although there are effective methods for removing or degrading persistent organic compounds, such as advanced oxidation, adsorption, membrane separation, and aerobic biochemical treatment, these approaches present challenges such as high energy consumption, carbon emissions, high investment and operational costs, and the generation of hazardous waste. Advanced Oxidative Processes (AOPs) are efficient methods for wastewater treatment and environmental pollutant remediation. These processes involve the use of highly reactive oxidizing compounds, such as hydrogen peroxide (H2O2) and sodium persulfate. AOPs have been shown to be highly effective in removing a wide range of pollutants, including toxic chemicals, pesticides, dyes, and pharmaceutical products. The aim of this study was to evaluate the reduction of Chemical Oxygen Demand (COD) through advanced oxidative processes applied to an industrial effluent generated during the synthesis of picoxystrobin. Laboratory-scale electro-oxidation tests were conducted at the agricultural pesticide company's laboratory in Taquari/RS, aiming to find a viable treatment route for the picoxystrobin effluent at the Effluent Treatment Station. The effluent used was collected from the production process of the fungicide Picoxystrobin and had an approximate COD of 237,000.00 mg O2 / L, as well as high chloride levels (> 50 g/L) and a significant amount of methanol, dimethylacetamide, and toluene in its composition. Despite employing various treatment methods and combinations, the maximum removal achieved was 41.95% through the combined use of steel electrodes, graphite, hydrogen peroxide, and polymer. Although total COD removal was not achieved, the results obtained are still significant considering the complexity and high organic load of the effluent in question. Advanced Oxidative Processes have shown promise as an approach for treating industrial effluents with high levels of COD.