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Origine de la matière organique et devenir de bactéries coliformes dans des eaux faiblement nutritives

Abstract : Coliform bacteria are faecal contamination indicators and their detection in treated waters is a frequent cause of health non-compliance. Survival of these organisms is strongly related to the biodegradable dissolved organic matter (DOM) of waters. The aim ofthis research work is to underline the influence of the origin of DOM on the fate of planctonic and fixed coliform bacteria in low nutritive waters (river water sampled after heavy rainfalls and algal bloom water), conveying specific organic matrix, of which a fraction is likely to pass through the treatment barrier. The study of coliforms behaviour in drinking waters, without disruption of their nutritive status (DOC ranged from 1.5 to 2 mg L-1 with BDOC near to 30%) indicates a rapid culturability loss and the absence of durable colonisation of pilot systems. On the other hand, these bacteria are able to keep their culturability at least 28 days in low nutritive waters having DOC concentrations classically observed in drinking waters. A relationship specific of the water type between biodegradable DOC and coliforms culturability loss, clearly appears. Finally, these bacteria keep their capacity to multiply, even when they loss their culturability, suggesting a viable but non-culturable physiological state. The following of coliforms biofilm development by FTIRIATR spectroscopy in low nutritive waters and in a drinking water confirms the previous observations. The biofilm is stable for 15 days in low nutritive waters, whereas its presence become unsignificant only after one day in the drinking water.
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Submitted on : Thursday, March 29, 2018 - 10:38:12 AM
Last modification on : Wednesday, August 10, 2022 - 6:16:18 PM

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Marc Boualam. Origine de la matière organique et devenir de bactéries coliformes dans des eaux faiblement nutritives. Microbiologie et Parasitologie. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN12009⟩. ⟨tel-01746457⟩



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