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Composition of activated sludge settling and planktonic bacterial communities treating industrial effluent and their correlation to settling problems.

Abstract：

: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.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Nadarajah N,Allen DG,Fulthorpe RR

doi

10.1007/s00253-010-2829-3

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

1205-14

issue

5

eissn

0175-7598

issn

1432-0614

journal_volume

88

pub_type

杂志文章

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