Optimization of Culture Conditions for Enhanced Decolorization …
151
Fig. 6 Effect of temperature
on decolorization of AV 90
by Aspergillus flavus
has been observed in decolorization of acid fuchsin, acid violet and evans blue up to
83–91% within 2 h whereas it slowly decreased to 45% for bromophenol blue within
8 h. The difference in the decolorization efficiencies for the dyes is from the different
redox potentials of the colored substrates (Chivukula and Renganathan 1995).
4.4 Effect of Initial Dye Concentration on AB 193 and AV 90
Decolorization
The decolorization efficiencies of Aspergillus flavus against AB 193 and AV 90
reached 100% till 100 mg/L whereas when the concentration of dye was increased
slowly, decreased decolorization was observed which is shown in Figs. 7 and 8. It was
observed that at concentrations 100 mg/L the decolorization was quite efficient, and it
reached up to 96% (AB 193) and 97% (AV 90) respectively. When the concentration
was gradually increased to 125 mg/L, the decolorization of AB 193 and AV 90
decreased up to 65 and 56%, respectively.
Fig. 7 Effect of initial dye
concentration on
decolorization of AB 193 by
Aspergillus flavus
Dye concentration (mg/L
-1 )
151
Fig. 6 Effect of temperature
on decolorization of AV 90
by Aspergillus flavus
has been observed in decolorization of acid fuchsin, acid violet and evans blue up to
83–91% within 2 h whereas it slowly decreased to 45% for bromophenol blue within
8 h. The difference in the decolorization efficiencies for the dyes is from the different
redox potentials of the colored substrates (Chivukula and Renganathan 1995).
4.4 Effect of Initial Dye Concentration on AB 193 and AV 90
Decolorization
The decolorization efficiencies of Aspergillus flavus against AB 193 and AV 90
reached 100% till 100 mg/L whereas when the concentration of dye was increased
slowly, decreased decolorization was observed which is shown in Figs. 7 and 8. It was
observed that at concentrations 100 mg/L the decolorization was quite efficient, and it
reached up to 96% (AB 193) and 97% (AV 90) respectively. When the concentration
was gradually increased to 125 mg/L, the decolorization of AB 193 and AV 90
decreased up to 65 and 56%, respectively.
Fig. 7 Effect of initial dye
concentration on
decolorization of AB 193 by
Aspergillus flavus
Dye concentration (mg/L
-1 )