Abstract
This paper reports the results of a study on the equilibrium behavior of cadmium adsorption by a tropical, indigenous single-cell algal species, identified as Oocystis sp., in a static reactor. An exponential equation, in the form of Ce /C05a exp(bM/C0), was found to be statistically significant in expressing the relationship between the ratio of equilibrium cadmium ~Cd! concentration in solution (Ce) to the initial cadmium concentration ( C0) and the ratio of algal biomass ~M! to initial cadmium concentration ( C0) for both living and dead algal biomass. Based on the above equation and the mass balance of cadmium in the system, another two equations were developed and verified by a series of batch experiments. One equation, in the form of x/m5@12a exp(bM/C0)#/(M/C0), describes the relationship between the cadmium content per unit algal biomass ( x/m) and the ratio M/C0 . The other equation takes the form of x/m5b(12Ce /C0)/ln(Ce /aC0) and describes the relationship between the ratio of equilibrium cadmium concentration to initial cad- mium concentration and cadmium content per unit algal biomass. The above models for Cd adsorption were found to be applicable over a pH range of 4.5-10.5 even though it was found that pH affects the Cd adsorption potential significantly.
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