Effect of solids retention time on antibiotics removal performance and microbial communities in an A/O-MBR process

► We compared performance and microbial communities at different SRTs in the A/O-MBR. ► Betaproteobacteria and Gammaproteobacteria were the dominant species. ► SRT gave a significant influence on the nitrifying bacteria gene contents. ► Sulfa antibiotics resistance gene present a decreasing tendency...

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Veröffentlicht in:Bioresource technology 2012-02, Vol.106, p.36-43
Hauptverfasser: Xia, Siqing, Jia, Renyong, Feng, Fan, Xie, Kang, Li, Haixiang, Jing, Danfeng, Xu, Xiaotian
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container_start_page 36
container_title Bioresource technology
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creator Xia, Siqing
Jia, Renyong
Feng, Fan
Xie, Kang
Li, Haixiang
Jing, Danfeng
Xu, Xiaotian
description ► We compared performance and microbial communities at different SRTs in the A/O-MBR. ► Betaproteobacteria and Gammaproteobacteria were the dominant species. ► SRT gave a significant influence on the nitrifying bacteria gene contents. ► Sulfa antibiotics resistance gene present a decreasing tendency with SRT decreasing. ► Longer SRT was the suitable operational condition for antibiotics removal. The effect of solids retention time on reactor performance and microbial community composition in anoxic/aerobic membrane bioreactors (A/O-MBR) were investigated in this study. Experimental results showed high removal efficiencies of conventional pollutants. Antibiotics removal efficiencies were obviously affected by SRT changes. Longer SRT (above 30 days) was proved to be suitable operational condition for antibiotics removal. Denaturing gradient gel electrophoresis (DGGE) and clone library analysis revealed that bacteria belong to Betaproteobacteria and Gammaproteobacteria were the dominant species during wastewater treatment and antibiotics removal. SRT significantly influenced the relative numbers of nitrifying bacteria. Removal efficiency of total nitrogen (TN) decreased when SRT was 3 days, because nitrogen loading exceeded the denitrification ability of the reactors. Unlike tet C and tet E genes, sulfa antibiotics resistance gene presented a decreasing tendency with the decrease of SRT, and finally affected sulfa antibiotics removal efficiencies.
doi_str_mv 10.1016/j.biortech.2011.11.112
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The effect of solids retention time on reactor performance and microbial community composition in anoxic/aerobic membrane bioreactors (A/O-MBR) were investigated in this study. Experimental results showed high removal efficiencies of conventional pollutants. Antibiotics removal efficiencies were obviously affected by SRT changes. Longer SRT (above 30 days) was proved to be suitable operational condition for antibiotics removal. Denaturing gradient gel electrophoresis (DGGE) and clone library analysis revealed that bacteria belong to Betaproteobacteria and Gammaproteobacteria were the dominant species during wastewater treatment and antibiotics removal. SRT significantly influenced the relative numbers of nitrifying bacteria. Removal efficiency of total nitrogen (TN) decreased when SRT was 3 days, because nitrogen loading exceeded the denitrification ability of the reactors. Unlike tet C and tet E genes, sulfa antibiotics resistance gene presented a decreasing tendency with the decrease of SRT, and finally affected sulfa antibiotics removal efficiencies.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>22197076</pmid><doi>10.1016/j.biortech.2011.11.112</doi><tpages>8</tpages></addata></record>
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subjects Aerobiosis
Anaerobiosis
Anti-Bacterial Agents - isolation & purification
antibiotic resistance
Antibiotics
bacteria
Bacteria - genetics
Bacteria - metabolism
beta-Proteobacteria
Betaproteobacteria - genetics
Biodegradation, Environmental
bioreactors
Bioreactors - microbiology
clones
community structure
Denaturing Gradient Gel Electrophoresis
Denitrification
Drug Resistance, Bacterial - genetics
Environmental Restoration and Remediation - instrumentation
Environmental Restoration and Remediation - methods
gamma-Proteobacteria
Gene Dosage - genetics
Gene Library
genes
Membrane bioreactor
Membranes, Artificial
microbial communities
Microbial community
Molecular Sequence Data
Nitrification
nitrogen
nitrogen content
Phylogeny
pollutants
Real-Time Polymerase Chain Reaction
Removal performance
RNA, Ribosomal, 16S - genetics
Sewage - microbiology
Solids retention time
Time Factors
wastewater treatment
Water Pollutants, Chemical
title Effect of solids retention time on antibiotics removal performance and microbial communities in an A/O-MBR process
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