The University of Southampton
University of Southampton Institutional Repository

Limits to growth and what keeps a biofilm finite

Limits to growth and what keeps a biofilm finite
Limits to growth and what keeps a biofilm finite
Two of the factors, shear erosion and diffusive mass transfer, which limit the growth of heterogeneous biofilms are considered. For permeable beds of particulates, with a regulated throughflow, equating shear induced erosion and biofilm growth, leads to estimates of biofilm thickness and activity which conform with experimental measurements. In the more open environments of pipes and channels, increased thickness of biofilm is not directly balanced by increased cell erosion from the biofilm surface. However increasing thickness leads to growth limitations as diffusion limits the rate of mass transfer to cells deep in the film. For heterogeneous biofilms , consisting of complex clusters intersected by channels, mass transfer into the biofilm is by a combination of advective flow in the channels and diffusive transfer in clusters. In this paper we have considered mass transfer into simplified cluster forms, that is cylinders and hemispheres. Using the concept of critical dimension we have explored some of the implications of these simplified structures. We discuss the limitation to this approach as fluid shear alters the form of these simplified clusters. The viscoelastic properties of the biofilm clusters are being investigated and should allow better prediction of the effect of lateral shear on simple forms. The advection in biofilm channels and the related mass transfer processes needs further investigation.
0952043262
303-316
BioLine
Boyle, John D.
3c52d3c4-d167-4a83-a523-b1541f8d3d18
Dodds, Ian
85855844-52ba-4fd8-92a8-cb6d25288686
Lappin-Scott, Hilary
b9e7513f-0c5e-4282-8d8c-527688488410
Stoodley, Paul
08614665-92a9-4466-806e-20c6daeb483f
Bayston, R.
Brading, M.
Gilbert, P.
Walker, J.C.
Wimpenny, J.W.T.
Boyle, John D.
3c52d3c4-d167-4a83-a523-b1541f8d3d18
Dodds, Ian
85855844-52ba-4fd8-92a8-cb6d25288686
Lappin-Scott, Hilary
b9e7513f-0c5e-4282-8d8c-527688488410
Stoodley, Paul
08614665-92a9-4466-806e-20c6daeb483f
Bayston, R.
Brading, M.
Gilbert, P.
Walker, J.C.
Wimpenny, J.W.T.

Boyle, John D., Dodds, Ian, Lappin-Scott, Hilary and Stoodley, Paul (1999) Limits to growth and what keeps a biofilm finite. In, Bayston, R., Brading, M., Gilbert, P., Walker, J.C. and Wimpenny, J.W.T. (eds.) “Biofilms: The Good, The Bad, and The Ugly” 4th meeting of the Biofilm Club. Cardiff, GB. BioLine, pp. 303-316.

Record type: Book Section

Abstract

Two of the factors, shear erosion and diffusive mass transfer, which limit the growth of heterogeneous biofilms are considered. For permeable beds of particulates, with a regulated throughflow, equating shear induced erosion and biofilm growth, leads to estimates of biofilm thickness and activity which conform with experimental measurements. In the more open environments of pipes and channels, increased thickness of biofilm is not directly balanced by increased cell erosion from the biofilm surface. However increasing thickness leads to growth limitations as diffusion limits the rate of mass transfer to cells deep in the film. For heterogeneous biofilms , consisting of complex clusters intersected by channels, mass transfer into the biofilm is by a combination of advective flow in the channels and diffusive transfer in clusters. In this paper we have considered mass transfer into simplified cluster forms, that is cylinders and hemispheres. Using the concept of critical dimension we have explored some of the implications of these simplified structures. We discuss the limitation to this approach as fluid shear alters the form of these simplified clusters. The viscoelastic properties of the biofilm clusters are being investigated and should allow better prediction of the effect of lateral shear on simple forms. The advection in biofilm channels and the related mass transfer processes needs further investigation.

PDF
boyleGREG99C.pdf - Other
Download (222kB)

More information

Published date: 1999
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 157623
URI: https://eprints.soton.ac.uk/id/eprint/157623
ISBN: 0952043262
PURE UUID: 57c3ac75-70c4-4ee4-a91f-2489495896d4

Catalogue record

Date deposited: 16 Jun 2010 09:09
Last modified: 18 Jul 2017 12:40

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×