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Adhésion de bactéries transportées par des fines de charbon activé à des biofilms de réseau d'eau potable

Abstract : The biological activated carbon filtration step of a drinking water treatment plant controls the biological instability of water. That allows a limited bacterial growth in the distribution system. Therefore the disinfectant doses used on water are reduced, as weIl as the disinfection by-products that can be carcinogenic and mutagenic. Activated carbon filtration beds release particles called carbon fines in their effluent. Fines can be colonized by bacteria, including coliforms. The objective of the research presented here was to study the accumulation in biofilms of bacteria transported by carbon fines and to observe transformed biofilms under disinfecting conditions. Biofilms were developed in annular reactors under simulated drinking water distribution network conditions. We showed that Klebsiella pneumoniae was transported to biofilms and contaminated them by adhering to carbon fines. Carbon fines attachment to biofilm is dependent to their size, larger fines being more able to persist. We observed a double action of chlorine and monochloramine: partial disinfection of the biofilm and removal of a fraction of the biomass. Chlorine efficacy was limited against biofilms contaminated with K. pneumoniae transported by carbon fines. Approximately 10% of the coliform population and 20% of the carbon fines remained attached to biofilm despite 0.5 mgL-1 continuous chlorination. These results and the fact that K. pneumoniae attached to suspended carbon fines was resistant to chlorination show the importance of the final disinfection downstream the filters to limit the public health risks associated with biologically activated carbon filtration.
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Submitted on : Thursday, March 29, 2018 - 10:57:45 AM
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  • HAL Id : tel-01747350, version 1



Pierre Morin. Adhésion de bactéries transportées par des fines de charbon activé à des biofilms de réseau d'eau potable. Microbiologie et Parasitologie. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN12157⟩. ⟨tel-01747350⟩



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