Biotransformation of Phosphogypsum by Sulphate-Reducing Bacteria in Media Containing Different Zinc Salts
M. Rzeczycka*, A. Suszek, M. Błaszczyk
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Department of Environmental Microbiology, Institute of Microbiology,
Warsaw University, Miecznikowa 1, 02-096 Warsaw, Poland
Pol. J. Environ. Stud. 2004;13(2):209-217
The effect of zinc on the biotransformation of phosphogypsum, COD reduction and growth rate (µmax day-1) of an SRB community and Desulfotomaculum ruminis in media with sodium lactate or ethanol was examined. Depending on the form of zinc (Zn3(PO4)2 x 4H2O, ZnSO4 x7H2O, ZnCl2, Zn(NO3)2 x 6H2O) and its initial concentration (0-80 mg Zn2+/l) lower sulphate reduction and COD reduction was observed. The effect of Zn2+ also depended on the composition of the studied populations and carbon source in the medium. The lowest inhibition of specific growth rate was determined in cultures of the pure strain and in medium with zinc phosphate (with lactate or ethanol IC50=63 or 75 mg Zn2+/l, respectively) and the highest in cultures of sulphate-reducing bacterial communities in medium with zinc nitrate (with lactate or ethanol IC50= 35 or 20 mg Zn2+/l, respectively).
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