Growth and Activity of Sulphate-Reducing Bacteria in Media Containing Phosphogypsum and Different Sources of Carbon
M. Rzeczycka, M. Błaszczyk
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Department of General Microbiology, Institute of Microbiology, Warsaw University, 02-096 Warsaw, Miecznikowa 1, Poland
Pol. J. Environ. Stud. 2005;14(6):891-895
The possibility of using a mixed community of sulphate-reducing bacteria (SRB) for the biotransformation of phosphogypsum was examined. The greatest reduction of phosphogypsum (g/l) was determined in cultures with lactate (3.3), ethanol or casein (2.7), almost two-fold less in media with glucose or lactose and threefold less in medium with acetate. In media with lactate or ethanol growth inhibition (I = µ (µmax) was slight (I = 0.80 or 0.79) but much higher in the case of cultures with lactose (I=0.41), glucose (I=0.54), acetate or casein (I=0.62). In those cultures in which the concentration of sulphides was very high (about 600 mg HS-/l) and the concentration of acetic acid did not exceed 10 mg/l (e. g. in cultures with glucose), inhibition of SRB was mainly caused by H2S. In cultures with transient low pH value (e. g. containing lactose or acetate) the factor causing stronger growth inhibition was acetic acid. A condition for obtaining high SRB activity in media with phosphogypsum and fermentable carbon sources is constant monitoring of the reaction of the medium and/or counteracting the accumulation of toxic concentrations of hydrogen sulphide and acetic acid.
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