Abstract:
Many microorganisms are able to transform synthetic dyes to non-colored and/or completely
mineralize products. This study deals with the ability of selected bacterial isolates to decolorize
synthetic dyes (all selected dyes were tested at concentration of 25 ppm, Red food dye at
concentration 1%). Color removal was measured in cultures containing dyes incubated for 12
days. All isolates were weak in removing Methylene green, Nile blue, and Acridine orange from
aqueous solutions. However Brilliant yellow, Congo red and Red food, were decolorized within
2-8 days. UV–VIS scan (300–700 nm) of culture supernatants showed decolorization and
decrease in dye concentration at different incubation times. Decolorization of Brilliant yellow
ranged from 99.78% to 100%. While decolorization of Congo red ranged from 81.7% to 99.8%.
Highest decolourization capability by tested isolates was shown with Red food. These isolates
can be used on the treatment of dye-containing wastewaters. |
