Gupta et al. (2006) and Ozer et al. (2006) suggested that the dye removal may be attributed to the accumulation of dye ions on the surface of algal biopolymers and further to the diffusion of the dye molecules from aqueous phase onto solid phase of the biopolymer.
Moreover, Daneshvar et al. (2007) stated thatcolour removal by algae was due to three intrinsically different
mechanisms of assimilative utilization of chromophores for the production of algal biomass, CO2 and H2O transformation of coloured molecules to non-coloured molecules, and adsorption of chromophores on algal biomass. Mohan et al. (2002) attribute the decolorization to biosorption followed by bioconversion and biocoagulation.