Heavy metal pollution of wastewater is a common environmental threat, since the toxic metal ions dissolved can eventually reach the top of the food chain and thus, become a risk factor for people`s health. Various methods of effluent treatment such as chemical precipitation, coagulation, flocculation, flotation, ionic exchange and filtration are commonly used for heavy metals removal from liquid streams; these techniques possess some disadvantages, particularly, inadequate metals removal when applied to dilute effluents on a large scale basis. In this work, a Rhodococcus opacus strain was evaluated as a potential biosorbent for Ni(II) and Al(III) removal from aqueous solution for biosorptive flotation process, trough experimental batch experiments. The pH value suitable for biosorption and flotation was around 5 for both metals. The data pertaining to the uptake capacity of the Rhodococcus opacus as a function of the nickel and aluminum ion concentration had been fitted to the Redlich- Peterson and Temkin isotherm model, respectively; where the maximum uptake capacities obtained were: 7,63 and 41,59 mg.g-1 for nickel and aluminum, respectively. The nickel and aluminum kinetics biosorption were modeled using a pseudo second order rate equation. The superficial properties of the microorganism had also been evaluated before and after the interaction with the metals, to be able to find out the possible mechanism implied in the biosorption; by means of the electro kinetic measurements (Zeta Potential) and Infrared spectroscopy (FTIR). In the biossorptive flotation, it was verified that the microorganism presents excellent properties a collector and foaming agent, reaching 90% and 95% removal of nickel and aluminum. The results of this work showed that the Rhodococcus opacus has a strong and feasible engineering potential for heavy metals removal by biossorptive flotation.