Toxic Metal Removal by Biosorption

The goal of all water treatment process is to remove existing contaminants in the water, or reduce the concentration of such contaminants so the water becomes fit for its desired end-use. One such use is returning water that has been used back into the natural environment without adverse ecological impact. The processes involved in treating water for drinking purpose may be solids separation using physical processes such as settling and filtration, and chemical processes such as disinfection and coagulation. Biological processes are employed in the treatment of wastewater and these processes may include, for example, aerated lagoons, activated sludge or slow sand filters. Recovery and removal of toxic metal ions is a major problem. Biosorption offers cheap alternative forb developing countries like India. This paper studies the various microorganisms and the mechanism of removal