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Effet des phosphates sur la physiologie des bactéries et la composition taxonomique des eaux potables

Abstract : Phosphates may be applied to limit corrosion and plumbosolvency in drinking water distribution system. Since, phosphates are bacterial nutrients, it is necessary to understand bacterial behaviour following phosphate addition The study has been realised in order to characterise the effects of added phosphates on drinking water distribution system bacteriology. Different waters, hydraulics conditions, bacterial populations, phosphate concentration, phosphate solution have been performed, without modifying bacterial physiology. Growth and cultivability of suspended populations are not statistically modified whatever the phosphate supply is (from 0 to 2 mg P L-1). None of following biofilms measurements were modified by phosphate addition: cultivability, potential exoproteolytic activity, total counts with DAPI staining, proportion of cells hybridising with a probe targeting Eubacteria taxonomic level, biofilm compositions as expressed by carbohydrates, and aminoacids concentrations. However, phosphate concentration of biofilm is doubled during phosphate treatment, and bacterial enzymatic activity is suspected to hydrolysis polyphosphates when added. Moreover the proportion of the taxonomic group named -subclass of Proteobacteria is statistically enhanced by phosphate addition. Phosphate treatment leads to limit transiently cultivability decrease due to monochloramination by two times However, changes due to phosphates are , (i) compared to their effect on corrosion and thereby on biofilm associated with corrosion, (ii) compared to the effects on disinfection on biofilm chemical composition in term of carbohydrates and aminoacids, and on biofilm taxonomic composition and even (iii) compared to the effect of fixation to a surface (biofilm formation), taxonomic diversity of suspended population being a smaller
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Submitted on : Thursday, March 29, 2018 - 11:44:28 AM
Last modification on : Wednesday, August 10, 2022 - 6:11:25 PM
Long-term archiving on: : Friday, September 14, 2018 - 7:15:04 AM


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Magali Batté. Effet des phosphates sur la physiologie des bactéries et la composition taxonomique des eaux potables. Sciences du Vivant [q-bio]. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10287⟩. ⟨tel-01748666⟩



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