title: Effects of medium composition on the bacterial leaching of metals from digested sludge.
abstract: 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.
authors.affiliation: Institut National de la Recherche Scientifique (INRS-Eau), Université du Québec, Complexe Scientifique, 700 rue Einstein, Ste-Foy, Canada G1V 4C7.
authors.forename: R D
authors.initials: RD
authors.lastname: Tyagi
authors.forename: D
authors.initials: D
authors.lastname: Couillard
authors.forename: Y
authors.initials: Y
authors.lastname: Grenier