The purpose of the study was to determine the effect of the fermenter construction on the utilization of model dairy waste.The process was carried out using K.fragilis at controlled pH and temperature.The bioutilization process was performed in the fermenter FL-10 equipped with three different mixing systems with baffles and without them. A circulating stirrer with diffuser (A, B), a stirrer with rotating helical strips (C,D) and two turbine-disc impellers mounted to a common shaft (E,F) were used.The process was investigated at the aeration rate VVm=1.0 and two rotation frequencies of the stirrer shaft:450 /min and 650 /min.The optimal results were obtained by using A and B systems.
The biodegradation of dyes in textile wastewater is nowadays a subject of intensive research. In particular, a biotransformation of various dyestuffs by white-rot fungi is the most promising alternative. This study provides the results of decolorization of the aqueous solution of azo- and anthraquinone dyes by the laccase complex from Cerrena unicolor. The investigations were carried out using 3 systems: with active biomass, with sterilized biomass (biosorption), and with secretion of enzymatic complex. The enzymatic biotransformation gave to 97% decolorization of Acid Blue 62 and 95% decolorization of Reactive Blue 81 after 15 min. The dye?s adsorption on mycelia contributes substantially (30-40%) to decolorization of the textile wastewater.
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