Abstract
A chromium complex dye (Acid brown 45) was chosen to explore the feasibility of color and chromium removal using growing Aspergillus flavus in a batch bioreactor. The chromium concentration was observed to be 1.006 mg/L in 100 mg/L dye concentration. Removal of color and chromium was studied for a dye concentration range of 50–750 mg/L for up to 50 h and showed a reduction of 78–9% and 81–21% for color and chromium, respectively, at an optimized pH 4.5. The biomass concentration was reduced from 3.8 to 0.7 g/L with increasing dye concentration from 50 to 750 mg/L. Further, optimization of parameters for color removal was studied using a statistical approach response surface methodology (RSM). The ranges of the parameters were initial dye concentration: 100–300 mg/L, pH: 3.5–4.5 and time: 35–50 h. Maximum color removal (75.25%) was observed at dye concentration: 100 mg/L, pH: 4.84, and time: 50 h. The desirability of the RSM model was found to be 0.967.
Published Version
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