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Article Dans Une Revue Biofouling Année : 2016

Bacterial repopulation of drinking water pipe walls after chlorination

Résumé

The short-term kinetics of bacterial repopulation were evaluated after chlorination of high-density polyethylene (HDPE) colonized with drinking water biofilms and compared with bare HDPE surfaces. The effect of chlorination was partial as a residual biofilm persisted and was time-limited as repopulation occurred immediately after water resupply. The total number of bacteria reached the same levels on both the bare and chlorinated biofilm-fouled HDPE after a seven-day exposure to drinking water. Due to the presence of a residual biofilm, the hydrophobicity of chlorinated biofilm-fouled surface exhibited much lower adhesion forces (2.1 nN) compared to bare surfaces (8.9 nN). This could explain the rapid repopulation after chlorination, with a twofold faster bacterial accumulation rate on the bare HDPE surface. γ-Proteobacteria dominated the early stages of repopulation of both surfaces and a shift in the dominance occurred over the colonization time. Such observations define a timescale for cleaning frequency in industrial environments and guidelines for a rinsing procedure using drinking water.
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Dates et versions

hal-01912925 , version 1 (05-11-2018)

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Laurence Mathieu, Gregory Francius, Racha El Zein, Edith Angel, Jean-Claude Block. Bacterial repopulation of drinking water pipe walls after chlorination. Biofouling, 2016, 32 (8), pp.925 - 934. ⟨10.1080/08927014.2016.1212989⟩. ⟨hal-01912925⟩
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