Remediação de um efluente da indústria de resina polifenólica: associação do processo fenton e tratamento biológico

Abstract

Effluents require cost-effective and highly efficient methods due to the constant need to reduce recalcitrant levels. The aim of this study was to use a fungus isolated in the Dois Vizinhos region to treat waste from the polyphenolic resin industry, using a chemical treatment to enable bioremediation. The characterization of the effluent revealed a high phenolic load, an extremely high chemical oxygen demand (COD) value (108,437.50 mgO2 L-1), and an equally high biochemical oxygen demand (BOD5) value (59,811.94 mgO2 L-1). The biodegradability ratio of the effluent, denoted by 0.55, indicated the potential for biodegradation. The effluent also exhibited a high color value, denoted by 74,621.21 UC, due to the high phenol concentration in the medium. The study demonstrated the need for oxidative chemical treatment prior to biological treatment, using Fenton's treatment with ferrous sulfate concentrations equivalent to 1.66 g L-1 and hydrogen peroxide equivalent to 4.35 g L-1. The combination of chemical and biological processes resulted in reductions of 60.7% in the total phenolic load, 96.12% in COD, and 80% in color, indicating a promising combination of processes, although adaptations are needed for better remediation efficacy.