Rate and stoichiometry of microbial sulfate reduction by<i>Desulfovibrio desulfuricans</i>in biofilms

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The kinetics and stoichiometry of Desulfovibrio desulfuricans attached to a polycarbonate surface were determined in RotoTorque™ reactors and compared with those of suspended cells. Biofilm specific cellular growth rate (μb ) and detachment rate (qdx) were determined from unsteady state biofilm experiments. In the initial biofilm accumulation phase, the specific cellular growth rate was the same as the maximum specific growth rate for D. desulfuricans in suspension (μmax = 0.37‐h‐1); thereafter μb decreased and approached a steady state value of about 0.1‐h‐1. The decrease in average cellular specific growth rate could be attributed to substrate (lactate) limitation in some experiments, but in others there was no evidence of this. Biofilm‐specific cellular detachment rate decreased similarly to biofilm‐specific cellular growth rate. In biofilms, cellular yield at μb= 0.1.h‐1 was approximately 18% of planktonic cellular yield partly due to the production of extensive extracellular polymeric substance. A li...

Journal

  • Biofouling

    Biofouling 9 63-83, 1995-08-01

    Informa UK Limited

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