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Related Experiment Videos

Coliform culturability in over- versus undersaturated drinking waters.

D Grandjean1, S Fass, D Tozza

  • 1LCPME, UMR 7564 CNRS-UHP, Faculté de Pharmacie, Pôle de l'Eau, 15 avenue du Charmois, 54500 Vandoeuvre-lès-Nancy, France.

Water Research
|May 19, 2005
PubMed
Summary
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Corrosive drinking water, particularly with corroded cast iron pipes, may slow the decline of Escherichia coli culturability. This suggests pipe corrosion products might unexpectedly support bacterial viability in water systems.

Area of Science:

  • Environmental microbiology
  • Water quality engineering
  • Microbial ecology

Background:

  • Maintaining bacterial culturability in drinking water is crucial for public health.
  • Water chemistry, specifically saturation with calcium carbonate (CaCO3), influences pipe material reactivity.
  • Previous studies have not fully elucidated the role of pipe wall reactions on bacterial survival.

Purpose of the Study:

  • To investigate the culturability of Escherichia coli (E. coli) in drinking water under varying CaCO3 saturation levels.
  • To compare E. coli survival in systems with non-reactive versus reactive pipe walls.
  • To determine the influence of corrosive versus non-corrosive water on E. coli culturability.

Main Methods:

  • E. coli culturability was assessed in spiked drinking water using batch and chemostat reactors.

Related Experiment Videos

  • Reactors included glass (non-reactive) and corroded cast iron (reactive) systems.
  • Water conditions varied between undersaturated (corrosive) and oversaturated (non-corrosive) with respect to CaCO3.

    • Main Results:

    • E. coli generally failed to maintain culturability and colonize experimental systems.
    • Optimal E. coli culturability was observed at pH 8.2 or higher.
    • In reactive (corroded cast iron) reactors, E. coli decline was slower at pH 7.9-7.7 (corrosive water) compared to pH 8.24-8.64 (non-corrosive water).

    Conclusions:

    • Pipe wall corrosion, particularly from cast iron in corrosive water, may slow the loss of E. coli culturability.
    • Corrosion products appear to enhance E. coli viability, contrary to expectations.
    • Further research is needed to understand the mechanisms by which corrosion products affect bacterial survival in water distribution systems.