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Formation of bacterial streamers during filtration in microfluidic systems

Marty, Aurélie and Roques, Christine and Causserand, Christel and Bacchin, Patrice Formation of bacterial streamers during filtration in microfluidic systems. (2012) Biofouling, vol. 28 (n° 6). pp. 551-562. ISSN 0892-7014

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Official URL: http://dx.doi.org/10.1080/08927014.2012.695351

Abstract

Bacterial behavior during filtration is complex and is influenced by numerous factors. The aim of this paper is to report on experiments designed to make progress in the understanding of bacterial transfer in filters and membranes. Polydimethylsiloxane (PDMS) microsystems were built to allow direct dynamic observation of bacterial transfer across different microchannel geometries mimicking filtration processes. When filtering Escherichia coli suspensions in such devices, the bacteria accumulated in the downstream zone of the filter forming long streamers undulating in the flow. Confocal microscopy and 3D reconstruction of streamers showed how the streamers are connected to the filter and how they form in the stream. Streamer development was found to be influenced by the flow configuration and the presence of connections or tortuosity between channels. Experiments showed that streamer formation was greatest in a filtration system composed of staggered arrays of squares 10 μm apart.

Item Type:Article
Additional Information:Thanks to Taylor and Francis. The definitive version is available at http://www.tandfonline.com/doi/full/10.1080/08927014.2012.695351. Watch the vidéo showing the expérience at http://youtu.be/8CcGQAno7BQ
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Génie des Interfaces & Milieux Divisés (GIMD)
Laboratoire de Génie Chimique - LGC (Toulouse, France) - Bioprocédés et systèmes microbiens (BioSyM)
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Deposited By:Patrice Bacchin

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