Design of reaction conditions for the enhancement of microbial degradationof dyes in sequential cycles
Rashmi Sanghi , Awantika Dixit , Preeti Verma , Sadhna Puri
DOI:
Received February 27, 2009,Revised July 28, 2009, Accepted , Available online
Volume 21,2009,Pages 1646-1651
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The present study evaluated the potential of white-rot fungal strain Coriolus versicolor to decolorize five structurally di erent dyes
in sequential batch reactors under optimized conditions. The experiments were run continuously for seven cycles of 8 d each. High
decolorizing activity was observed even during the repeated reuse of the fungus, especially when the old medium was replaced with
fresh medium after every cycle. Biodegradation was the dominating factor as the fungus was able to produce the enzyme laccase mainly,
to mineralize synthetic dyes. The nutrients and composition of the medium played important roles in sustaining the decolorisation
potential of the fungus. Corncob was found be an easy and cheap substitute for carbon source for the fungus. Glucose consumption by
the fungus was in accordance to its decolorisation activity and chemical oxygen demand (COD) reduction.
