EFFECT OF SURFACTANTS ON REMAZOL BLUE BIOREMOVAL CAPACITY OF RHIZOPUS ARRHIZUS STRAIN GROWING IN MOLASSES MEDIUM

摘要

The effect of an anionic surfactant, dodecylbenzene-sulfonate (DBS), and a cationic one, dodecyl trimethyl ammonium bromide (DTAB), on Remazol Blue bioremoval by a Rhizopus arrhizus strain growing in molasses medium was examined. DBS inhibited but DTAB enhanced decol-orization. DTAB impact was investigated as a function of pH, dye and surfactant concentrations. Maximum bioremoval occurred at pH 6 when examining pH range 3-7. Dye concentrations of 50 to 800 mg/L were investigated, and bioremoval rates were 89.9 and 85.9 % in 50 and 100 mg/L dye with 0.5 mM DTAB. The effects of surfactant concentration were tested with 0.1, 0.5, 1 and 2 mM DTAB, and maximum decolorization was observed with 1 mM DTAB (97.1 and 52.8 % in 100 and 800 mg/L dye). The fungus has shown a maximum dye uptake capacity of 30.22 or 27.22 mg per g of dry cells with 0.5 or 1 mM DTAB. DTAB increased bioremoval rates, and surfactant induced decolorization technology is a feasible approach for wastewater treatment.