Descoloração do corante azul brilhante de remazol R por leveduras isoladas de moluscos do Rio Subaé, no estado da Bahia, Brasil

This research aimed to study the potential for decolorization of the Brilliant Blue dye Remazol R (RBBR) by five yeasts, identified as OJU2, SJL6, SF5, SJ10 and SJU5, optimize the conditions of growth of these yeasts and verify the toxicity of the product obtained after decolorization. For this purpose, tests were performed in batch in varying parameters: pH (2 to 8), glucose concentration (0 to 3%), dye concentration (25 to 100 ppm) and temperature (20 to 40°C). The yeasts showed ability to decolorize RBBR by biodegradation with rates ranging between 80 and 93% after 24 hours. The optimal conditions for decolorization were acid pH, glucose 2%, 25 ppm dye concentration and 25°C. After the toxicity tests with Artemia salina, decreased toxicity was observed following treatment with isolated SJU5 and SJ10, after 120 hours incubation.