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Mass balance of heavy metal uptake by encapsulated cultures ofKlebsiella aerogenes

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Abstract

Dialysis was employed as a method of speciating heavy metals in cultures of an extracellular polymer forming strain ofKlebsiella aerogenes. A noncapsulated strain of the same bacterium was used as a control, and a mass balance of copper, cadmium, cobalt, nickel, and manganese in batch culture at pH 4.5 and pH 6.8 and in continuous culture at pH 6.8 was constructed. Copper and cadmium were accumulated by the cell during rapid proliferation whereas all 5 metals were bound nonspecifically by extracellular polymer produced during stationary phase and at low dilution rates. The presence of extracellular polymer appeared to inhibit cellular uptake of nickel. At the lower pH, metal uptake was considerably reduced. The results are discussed in the context of metal removal in the activated sludge process of waste water treatment.

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Authors and Affiliations

  1. Public Health Engineering Laboratory, Imperial College, London, England

    Thomasine Rudd, Robert M. Sterritt & John N. Lester

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  1. Thomasine Rudd
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  2. Robert M. Sterritt
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  3. John N. Lester
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Rudd, T., Sterritt, R.M. & Lester, J.N. Mass balance of heavy metal uptake by encapsulated cultures ofKlebsiella aerogenes . Microb Ecol 9, 261–272 (1983). https://doi.org/10.1007/BF02097741

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