| Composition of activated sludge settling and planktonic bacterial communities treating industrial effluent and their correlation to settling problems. | |
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MedLine Citation:
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PMID: 20737270 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Problems with deflocculation and solids separation in biological wastewater treatment systems are linked to fluctuations in physicochemical conditions. This study examined the composition of activated sludge bacterial communities in lab-scale sequencing batch reactors treating bleached kraft mill effluent, under transient temperature conditions (30 to 45 °C) and their correlation to sludge settleability problems. The bacterial community composition of settled and planktonic biomass samples in the reactors was monitored via denaturing gradient gel electrophoresis of 16S ribosomal RNA gene fragments. Our analysis showed that settled biomass has a different community composition from the planktonic biomass (49 ± 7% difference based on Jaccard similarity coefficients; p < 0.01). During times of poor sludge compression, the settled and planktonic biomass became more similar. This observation supports the hypothesis that settling problems observed were due to deflocculation of normally settling flocs rather than the outgrowth of non-settling bacterial species. |
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Authors:
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Nalina Nadarajah; D Grant Allen; Roberta R Fulthorpe |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-08-25 |
Journal Detail:
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Title: Applied microbiology and biotechnology Volume: 88 ISSN: 1432-0614 ISO Abbreviation: Appl. Microbiol. Biotechnol. Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-18 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8406612 Medline TA: Appl Microbiol Biotechnol Country: Germany |
Other Details:
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Languages: eng Pagination: 1205-14 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering and Applied Chemistry, University of Toronto, ON, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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