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Environ Pollut. 1991;71(1):57-67.

Effects of medium composition on the bacterial leaching of metals from digested sludge.

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Institut National de la Recherche Scientifique (INRS-Eau), Université du Québec, Complexe Scientifique, 700 rue Einstein, Ste-Foy, Canada G1V 4C7.


The effects of parameters (soluble iron, K(2)HPO(4), MgSO(4), Ca(NO(3))(2), KCl and (NH(4))(2)SO(4)) on bacterial leaching of heavy metals from anaerobically digested sludge have been studied in a batch process using a strain of Thiobacillus ferrooxidans. The sludge was found to be a deficient iron source. Metal leaching rate was increased proportionally with the ferrous iron. Amendment of the sludge with a nitrogen source increased the metal solubilization efficiency to a very small extent. Addition of phosphate and other nutrients did not show any effect on the microbial leaching rate.


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