Effect of pH on growth and decolorization Fig. 4 shows the effect of pH on growth of Anabaena 7120

600 WordsApr 23, 20193 Pages
Effect of pH on growth and decolorization Fig. 4 shows the effect of pH on growth of Anabaena 7120 cells. It has been found that pH 9 and pH 11 are suitable for growth of cells, but the most promising and favourable result is obtained at pH 9 on 14th day. Elimination of dye by the blue-green algae is also dependent on the pH of the dye solution (Aksu and Tezar, 2005; Kumar et al. 2005). Fig. 5 shows the ability of Anabaena 7120 in removal of Red-RGB synthetic dye at different pH ranging from 3-11. It was observed that the percent removal increases from 50% to 100 % with the increase in pH from 3.0 to 11. It may be due to the fact that at higher pH, the surface area of the algae gets negatively charged, which enhances the interaction of…show more content…
This decline in the color removal activity can be attributed to the loss of cell viability at higher temperature (Chang et al. 2001; Saratale et al. 2009) Fig 7: Effect of temperature on growth of cells and decolourization The effect of algal biomass on the rate of decolourization is shown in Fig. 8. The algal biomass concentrations used were 0.2 O.D- 1.0 O.D. for an initial dye concentration of 90 ppm for 6 days. The results showed that as the concentration of the algal biomass was increased, there was increase in the percent removal of dye from 88% to 100%. This may be due to an increase in the surface area of the biosorbent, which in turn increases the binding site (Ahmed El Nemr et al. 2005). Fig 8: Effect of algal biomass on decolourization of dye Analysis of [H+] Concentration During the study of the effect of pH on growth and decolourization, it was found that the basic pH range (pH 8-11) of the solution was decreased to pH 7.5+0.2. Many microorganism including cyanobacteria have net negative charge on the surface because the anionic functional groups present in the cell wall. This decrease in the pH was may be due to production of acids and enzymes in the

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