Biologicalmethods offer potential advantages over physical and
chemicalmethods by being cheap and environmental friendly. In a
biological treatment different microorganisms such as aerobic and
anaerobic bacteria and fungi have been found to catalyze dye decol-
orization. Promising results were obtained by Dos Santos et al. in
accelerating dye decolorization by adding mediating compounds
and/or changing process conditions [2]. Generally the processes
occurring in microbial ecosystems are governed by the action of
many different microorganisms, all of which have a high degree
of interaction with each other. It is believed that the interacting microbial population together can perform certain ecological
functions better than each member of the population can do sepa-
rately [3]. A consortium of mixed culture of microorganisms has
several advantages for degrading compounds like those present
in the textile effluents containing dyes. Normally, a consortium is
more stable with changes in pH, temperature, and feeding com-
position when compared to pure cultures [4,5]. Also a consortium
hasmore chances of completemineralization of the dye present in
the effluent as they work in co-metabolism style compared with a
single strain [6]. Anaerobic microorganisms may be preferred for
decolorization of azo dyes in textile wastewaters because of their
properties [7]. For example, they generate electrons to cleave the
azo bond