From an economical standpoint, glucose is a costly carbon
source and, therefore, an attempt was made to replace it with
a cheaper carbon source such as molasses. Molasses concentration
in the study was limited to only 4 g/l due to its unwanted effect on
imparting total COD and colour of the influent. Results revealed
that although maximum COD could be removed in the system,
decolourization was quite less compared with that obtained using
glucose in the media. Observed high COD removal efficiency may be
due to complete mineralization of highly oxidizable substances
present in the molasses, whereas low decolourization efficiency
could be attributed to insufficient enzymes activities by the fungus
required to oxidize recalcitrant coloured compounds present in the
wastewater. Reduced performance of the bioreactor system due to
molasses may also be attributed to relatively more time and
metabolic energy required by the fungus to cleave the disaccharide
sugar sucrose present in molasses into a readily assimilable form as
compared with simple glucose that can easily assimilate and
directly enter the metabolic pathway of the microorganism. Thus, it
appears that although molasses contributed to the bioreactor
performance in some manner, the equivalent amount of glucose
present in it was insufficient and was not readily available for the
fungus to perform better in comparison with the operating conditions
(Stages IVeVI) when the wastewater was supplemented with
2 g/L or higher glucose
From an economical standpoint, glucose is a costly carbonsource and, therefore, an attempt was made to replace it witha cheaper carbon source such as molasses. Molasses concentrationin the study was limited to only 4 g/l due to its unwanted effect onimparting total COD and colour of the influent. Results revealedthat although maximum COD could be removed in the system,decolourization was quite less compared with that obtained usingglucose in the media. Observed high COD removal efficiency may bedue to complete mineralization of highly oxidizable substancespresent in the molasses, whereas low decolourization efficiencycould be attributed to insufficient enzymes activities by the fungusrequired to oxidize recalcitrant coloured compounds present in thewastewater. Reduced performance of the bioreactor system due tomolasses may also be attributed to relatively more time andmetabolic energy required by the fungus to cleave the disaccharidesugar sucrose present in molasses into a readily assimilable form ascompared with simple glucose that can easily assimilate anddirectly enter the metabolic pathway of the microorganism. Thus, itappears that although molasses contributed to the bioreactorperformance in some manner, the equivalent amount of glucosepresent in it was insufficient and was not readily available for thefungus to perform better in comparison with the operating conditions(Stages IVeVI) when the wastewater was supplemented with2 g/L or higher glucose
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