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The paper deals with the removal of chromium from aqueous solutions based on the process of biosorption. The select ed biosorbent is the fungus of Fomitopsis pinicola . The laboratory experiments study the kinetics of the biosorption process, the effects of grain-size, activating agents, length of th e activation process and physical conditions which play an important role in the process optimization. Among the factors that influence biosorption there are, particularly, the pH value, temperature, number of revolut...