AVALIAÇÃO DO PROCESSO DE REMOÇÃO DE CORANTE TÊXTIL UTILIZANDO COGUMELO PLEUROTUS OSTREATUS E O COMPOSTO RESIDUAL DE SUA PRODUÇÃO

Abstract

The release of textile effluents without treatment, or subjected to ineffective treatment, causes serious problems in aquatic ecosystems, due to the high load of toxic, bioaccumulative and highly colored compounds. In this context, the objective of this study was to evaluate the capacity and process of removing the textile dye Drimaren Red CL-7B, using the Pleurotus ostreatus mushroom and the residual compound resulting from its production, seeking to identify possible removal routes and evaluate the enzymatic activity. involved. Given this scenario, discoloration tests were carried out on a synthetic textile effluent simulating a real effluent. The concentrations of mushroom and substrate applied to the effluent were 50; 100 and 150 g L-1 and the pH values used were: 5, 7 and 9 during 6 hours of contact time. Likewise, after determining the best experimental condition, the possible removal mechanisms that occurred and the enzymatic activity of the mushroom and mycelium present in the substrate were also studied. It was verified that the operational condition considered optimal was obtained with pH 5 for both conformations of the fungus and concentration was 50 g L-1 and 150 g L-1, respectively. Under these conditions, the dye removal efficiency obtained was close to 80% for the mushrooms and 70% for the substrate. It was observed that the main removal mechanism was, in fact, adsorption. However, it is important to highlight that the enzymatic degradation process also played an important role in increasing overall efficiency. Furthermore, it was found that the enzymatic activity of laccases was manifested with greater intensity in the substrate and showed greater efficiency in acidic pH ranges, but is inactive in alkaline pH ranges. Analysis of MnP and LiP enzymes revealed no activity in the extract. Thus, the evaluation carried out with the mushroom and the residual compound from the production of the Pleurotus ostreatus mushroom for the treatment of synthetic textile effluents has high potential due to the simultaneous action of lignolytic enzymes and the high performance of adsorption in the removal of textile dyes. This study is part of creating an effective methodology for treating textile effluents and an alternative for reusing residual compounds from the production of edible mushrooms.