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Long-term dynamics of the bacterial community in a Swedish full-scale wastewater treatment plant

Journal article
Authors N. J. Fredriksson
Malte Hermansson
B. M. Wilen
Published in Environmental Technology
Volume 40
Issue 7
Pages 912-928
ISSN 0959-3330
Publication year 2019
Published at Department of Chemistry and Molecular Biology
Pages 912-928
Language en
Keywords Wastewater treatment, activated sludge, bacterial population dynamics, terminal restriction, soli sp-nov., activated-sludge, microbial communities, emended, description, diversity, sequence, genus, soil, identification, environments
Subject categories Earth and Related Environmental Sciences


The operational efficiency of activated sludge wastewater treatment plants depends to a large extent on the microbial community structure of the activated sludge. The aims of this paper are to describe the composition of the bacterial community in a Swedish full-scale activated sludge wastewater treatment plant, to describe the dynamics of the community and to elucidate possible causes for bacterial community composition changes. The bacterial community composition in the activated sludge was described using 16S rRNA gene libraries and monitored for 15 months by a terminal restriction fragment (T-RF) length polymorphism (T-RFLP) analysis of the 16S rRNA gene. Despite variable environmental conditions, a large fraction of the observed T-RFs were present at all times, making up at least 50% in all samples, possibly representing a relatively stable core fraction of the bacterial community. However, the proportions of the different T-RFs in this fraction as well as the T-RFs in the more variable fraction showed a significant variation over time and temperature. The difference in community composition between summer and winter coincided with observed differences in floc structure. These observations suggest a relationship between floc properties and bacterial community composition, although additional experiments are required to determine causality.

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