Distribution of extracellular polysaccharides and flotation of anaerobic sludge |
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| Authors: | D de Beer V O’Flaharty J Thaveesri P Lens W Verstraete D de Beer |
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| Institution: | (1) Laboratory for Microbial Ecology, University of Gent, Coupure Links 653, 9000 Gent, Belgium, BE;(2) Department of Microbiology, University of Galway, Galway, Ireland, IE;(3) Max Planck Institut für Marine Mikrobiologie, Celsiusstrasse 1, 28359 Bremen, Germany. Fax: 49 421 2028 580, DE |
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| Abstract: | Extracellular polysaccharides (EPS) were quantified in dense granules and loose flocs by chemical analysis of the uronic
acid content. Their distribution within the aggregates was determined by microscopic staining. Granules contained a higher
amount of EPS (1–1.6 mg/g volatile suspended solids, VSS) than flocs (0.3 mg/g VSS). In granules approximately 50% of the
total amount of EPS was present in a 40-μm-thick zone on the surface. The remainder was dispersed in the rest of the aggregate.
In flocs the highest concentration was present in the centre and the EPS layer on the surface was not found. Tests showed
that flocculent sludge was very sensitive to flotation, while the studied granules did not float. The lower susceptibility
to flotation of granules as compared to flocs was attributed to the presence of the hydrophilic EPS coating that prevents
attachment of gas bubbles.
Received: 21 November 1995/Received last revision: 15 April 1996/Accepted: 22 April 1996 |
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