Beginning of operation No biofilm around particles and no biolayer.
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Formation of biolayer
(biofilm on the mineral particles, exactly the same as
that observed in ‘trickling filters’ used for aerobic treatment of wastewater).
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Biolayer thickens with use and time.
The biolayer will form more quickly with
greater concentration of aquatic life in the water and larger quantities of
water being treated. |
Biolayer thickens and captured material accumulates.
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Biolayer thickens and captured material starts to restrict flow.
Flow is unacceptably low and surface layer must be cleaned.
Cleaning the MSF will leave biolayer intact.
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Research Article:
Visualisation of the microbial colonisation of a slow sand filter using an
Environmental Scanning Electron Microscope
Electronic Journal of Biotechnology
ISSN: 0717-3458 Vol.11 No.2, Issue of April 15, 2008
© 2008 Pontificia Universidad Católica de Valparaíso -- Chile
Received August 28, 2007 / Accepted December 6, 2007
Esther Devadhanam Joubert
Department of Environmental Sciences
Skinner Street Campus
University of South Africa
Balakrishna Pillay
Department of Microbiology
Westville Campus
University of KwaZulu-Natal
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