Development of the biotechnology of metals offers new possibilities in the utilization of microorganism for recovering metals from solutions and treating industrial waste waters. Owning to their ability to accumulate metals from dilute solutions, microorganisms can be used in those cases when conventional technologies fail to secure the desired purification of waste waters. The ability of microorganisms to bind metals from aqueous solution in some cases selectively is known as biosorption and microorganisms responsible for this process are called biosorbents. Various kinds of bacteria, fungi, and algae have accordingly been identified.
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