Experiments were done to study the bioremoval/ biosorptionof dis-azo dye by Aspergillus niger strain 20 in two concentrationsusing 5 liter bioreactor at five aeration rates. The experimental results are comparedfor various operating conditions. The dye used was direct brown and the inletair flow rate was: 1/8, , , 1, 2 v/v/min. The aeration rate of v/v/minyielded 9.2 g fungal biomass and removed 72% of the dye. Increasing of theaeration rate to 2 v/v/min increased the removal to 77%, whereas the biomasswas decreased markedly at the end of the incubation time. The results alsoindicate that the fungal biomass obtained at the three other air flow rates wasmore or less the same after 3 days of incubation. The obtained results indicatethat air flow rates 1/8, and v/v/min gave better dye bioremoval as comparedwith the high aeration rate (1, 2 v/v/min) and can be recommended for dis-azo dyebioremediation. Isotherm experiments were conducted to determine thesorbents-desorption behavior of examined dye from aqueous solutions usingLangmiur and Freundlich equations.
About the Authors:
Wafaa M. Abd El-Rahim and Hassan Moawad are associated with Agriculturalmicrobiology Department, National Research Center (NRC), NRC, Egypt.
Ola Ahmed M. El-Ardy is associated with Chemical Engineeringand Pilot Plant Department, NRC, Egypt.
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