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This study investigated the feasibility of using anaerobic sludge in natura and the dry matter for the removal of metals (Cu 2+ , Mn 2+ and Zn 2+ ) from aqueous solutions that work on a fixed bed column. Low concentrations of Cu 2+ , Mn 2+ and Zn 2+ (0.01 to 5.00 mg L -1 ) were applied, considering that the occurrence of bioaccumulation when using non-toxic microorganisms. The sludge used was collected from horizontal anaerobic reactors (RAH) and upflow with sludge blanket (UASB) used in the treatment of wastewater swine. The temperature was monitored at 20 ° C in all assays. Flow rates of 5, 10 and 15 mL min -1 , values of pH 4 and 6 and concentrations of 0.01, 0.5 and 1.0 mg L -1 of Cu 2+ and Mn 2+ , and of 0.05; 2.5 and 5.0 mg L -1 of Zn 2+ . The optimal pH for a removal of Mn 2+ and Zn 2+ for 4 and for Cu 2+ did not show a difference. The highest efficiency was found when the lowest concentration and flow values were used for all three biosorbents. Therefore, the results are applied for post-treatment of effluents with remaining concentrations of metals, which require polishing to a final number, taking into account the legal limits of water quality of the receiving body. The results demonstrated the efficiency of biosorbents (anaerobic sludge) for the removal of Cu 2+ , Zn 2+ and Mn 2+ in aqueous solution. The reuse of the waste in adsorption-desorption cycles was possible with the use of the CaCl 2 regeneration solution.

Remoção de íons Cu2+, Mn2+ e Zn2+ em solução aquosa utilizando lodo biológico de reatores anaeróbios de alta taxa