Influence of pharmaceutical residues on the structure of activated sludge bacterial communities in wastewater treatment bioreactors

Concern is growing over contamination of the environment with pharmaceuticals because of their widespread use and incomplete removal during wastewater treatment, where microorganisms drive the key processes. The influence of pharmaceuticals on bacterial community structure in activated sludge was as...

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Veröffentlicht in:Water research (Oxford) 2008-11, Vol.42 (17), p.4578-4588
Hauptverfasser: Kraigher, Barbara, Kosjek, Tina, Heath, Ester, Kompare, Boris, Mandic-Mulec, Ines
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container_issue 17
container_start_page 4578
container_title Water research (Oxford)
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creator Kraigher, Barbara
Kosjek, Tina
Heath, Ester
Kompare, Boris
Mandic-Mulec, Ines
description Concern is growing over contamination of the environment with pharmaceuticals because of their widespread use and incomplete removal during wastewater treatment, where microorganisms drive the key processes. The influence of pharmaceuticals on bacterial community structure in activated sludge was assessed in small-scale wastewater treatment bioreactors containing different concentrations (5, 50, 200 and 500 μg L −1) of several commonly used pharmaceuticals (ibuprofen, naproxen, ketoprofen, diclofenac and clofibric acid). T-RFLP analyses of the bacterial 16S rRNA genes indicated a minor but consistent shift in the bacterial community structure in the bioreactor R50 supplied with pharmaceuticals at a concentration of 50 μg L −1, compared to the control reactor R0, which was operated without addition of pharmaceuticals. In the reactors operated with higher concentrations of pharmaceuticals, a greater structural divergence was observed. Bacterial community composition was further investigated by preparation of two clone libraries of bacterial 16S rRNA genes from reactors R0 and R50. Most clones in both libraries belonged to the Betaproteobacteria, among which Thauera, Sphaerotilus, Ideonella and Acidovorax-related spp. dominated. Nitrite-oxidizing bacteria of the genus Nitrospira sp., which are key organisms for the second stage of nitrification in wastewater treatment plants, were found only in the clone library of the reactor without pharmaceuticals. In addition, diversity indices were calculated for the two clone libraries, indicating a reduced diversity of activated sludge bacterial community in the reactor supplied with 50 μg L −1 of each of selected pharmaceuticals.
doi_str_mv 10.1016/j.watres.2008.08.006
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The influence of pharmaceuticals on bacterial community structure in activated sludge was assessed in small-scale wastewater treatment bioreactors containing different concentrations (5, 50, 200 and 500 μg L −1) of several commonly used pharmaceuticals (ibuprofen, naproxen, ketoprofen, diclofenac and clofibric acid). T-RFLP analyses of the bacterial 16S rRNA genes indicated a minor but consistent shift in the bacterial community structure in the bioreactor R50 supplied with pharmaceuticals at a concentration of 50 μg L −1, compared to the control reactor R0, which was operated without addition of pharmaceuticals. In the reactors operated with higher concentrations of pharmaceuticals, a greater structural divergence was observed. Bacterial community composition was further investigated by preparation of two clone libraries of bacterial 16S rRNA genes from reactors R0 and R50. 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The influence of pharmaceuticals on bacterial community structure in activated sludge was assessed in small-scale wastewater treatment bioreactors containing different concentrations (5, 50, 200 and 500 μg L −1) of several commonly used pharmaceuticals (ibuprofen, naproxen, ketoprofen, diclofenac and clofibric acid). T-RFLP analyses of the bacterial 16S rRNA genes indicated a minor but consistent shift in the bacterial community structure in the bioreactor R50 supplied with pharmaceuticals at a concentration of 50 μg L −1, compared to the control reactor R0, which was operated without addition of pharmaceuticals. In the reactors operated with higher concentrations of pharmaceuticals, a greater structural divergence was observed. Bacterial community composition was further investigated by preparation of two clone libraries of bacterial 16S rRNA genes from reactors R0 and R50. Most clones in both libraries belonged to the Betaproteobacteria, among which Thauera, Sphaerotilus, Ideonella and Acidovorax-related spp. dominated. Nitrite-oxidizing bacteria of the genus Nitrospira sp., which are key organisms for the second stage of nitrification in wastewater treatment plants, were found only in the clone library of the reactor without pharmaceuticals. In addition, diversity indices were calculated for the two clone libraries, indicating a reduced diversity of activated sludge bacterial community in the reactor supplied with 50 μg L −1 of each of selected pharmaceuticals.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><pmid>18786690</pmid><doi>10.1016/j.watres.2008.08.006</doi><tpages>11</tpages></addata></record>
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subjects 16S rRNA
Acidovorax
Activated sludge
Applied sciences
Bacteria
Bacteria - classification
Bacteria - genetics
Bacteria - metabolism
Bacterial community structure
beta-Proteobacteria
Bioreactors
clofibric acid
Cloning, Molecular
community structure
Diversity
DNA, Bacterial - genetics
DNA, Bacterial - isolation & purification
Drug Residues - metabolism
drugs
Escherichia coli - genetics
Escherichia coli - isolation & purification
Exact sciences and technology
genes
Genetic Variation
ibuprofen
Ideonella
nitrification
nitrites
Nitrospira
nonsteroidal anti-inflammatory agents
Other industrial wastes. Sewage sludge
Pharmaceuticals
Phylogeny
Pollution
Polymorphism, Restriction Fragment Length
restriction fragment length polymorphism
ribosomal RNA
RNA, Bacterial - genetics
RNA, Bacterial - isolation & purification
RNA, Ribosomal, 16S - genetics
RNA, Ribosomal, 16S - isolation & purification
Sewage - microbiology
species diversity
Sphaerotilus
T-RFLP
Thauera
Waste Disposal, Fluid - methods
Wastes
wastewater treatment
Water Purification - methods
Water treatment and pollution
title Influence of pharmaceutical residues on the structure of activated sludge bacterial communities in wastewater treatment bioreactors
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