Phylogenetic analysis of the bacterial community in a full scale autothermal thermophilic aerobic digester (ATAD) treating mixed domestic wastewater sludge for land spread

The bacterial community associated with a full scale autothermal thermophilic aerobic digester (ATAD) treating sludge, originating from domestic wastewater and destined for land spread, was analysed using a number of molecular approaches optimised specifically for this high temperature environment....

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Veröffentlicht in:Water research (Oxford) 2012-05, Vol.46 (8), p.2488-2504
Hauptverfasser: Piterina, Anna V., Bartlett, John, Tony Pembroke, J.
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Bartlett, John
Tony Pembroke, J.
description The bacterial community associated with a full scale autothermal thermophilic aerobic digester (ATAD) treating sludge, originating from domestic wastewater and destined for land spread, was analysed using a number of molecular approaches optimised specifically for this high temperature environment. 16S rDNA genes were amplified directly from sludge with universally conserved and Bacteria-specific rDNA gene primers and a clone library constructed that corresponded to the late thermophilic stage (t = 23 h) of the ATAD process. Sequence analyses revealed various 16S rDNA gene sequence types reflective of high bacterial community diversity. Members of the bacterial community included α- and β-Proteobacteria, Actinobacteria with High G + C content and Gram-Positive bacteria with a prevalence of the Firmicutes (Low G + C) division (class Clostridia and Bacillus). Most of the ATAD clones showed affiliation with bacterial species previously isolated or detected in other elevated temperature environments, at alkaline pH, or in cellulose rich environments. Several phylotypes associated with Fe(III)- and Mn(IV)-reducing anaerobes were also detected. The presence of anaerobes was of interest in such large scale systems where sub-optimal aeration and mixing is often the norm while the presence of large amounts of capnophiles suggest the possibility of limited convection and entrapment of CO2 within the sludge matrix during digestion. Comparative analysis with organism identified in other ATAD systems revealed significant differences based on optimised techniques. The abundance of thermophilic, alkalophilic and cellulose-degrading phylotypes suggests that these organisms are responsible for maintaining the elevated temperature at the later stages of the ATAD process. ► Phylogeny presented based on optimised niche specific molecular tools. ► ATAD contains large numbers symbionts, capnophiles and anaerobes. ► Alkalophilic cellulolytic phylotypes are keys to stability of elevated temperature. ► Dataset may have utility in bioaugmentation for improvement of ATAD sludge settling. ► Great dissimilarity in microorganisms between worldwide ATAD systems.
doi_str_mv 10.1016/j.watres.2012.01.045
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Sequence analyses revealed various 16S rDNA gene sequence types reflective of high bacterial community diversity. Members of the bacterial community included α- and β-Proteobacteria, Actinobacteria with High G + C content and Gram-Positive bacteria with a prevalence of the Firmicutes (Low G + C) division (class Clostridia and Bacillus). Most of the ATAD clones showed affiliation with bacterial species previously isolated or detected in other elevated temperature environments, at alkaline pH, or in cellulose rich environments. Several phylotypes associated with Fe(III)- and Mn(IV)-reducing anaerobes were also detected. The presence of anaerobes was of interest in such large scale systems where sub-optimal aeration and mixing is often the norm while the presence of large amounts of capnophiles suggest the possibility of limited convection and entrapment of CO2 within the sludge matrix during digestion. 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Sequence analyses revealed various 16S rDNA gene sequence types reflective of high bacterial community diversity. Members of the bacterial community included α- and β-Proteobacteria, Actinobacteria with High G + C content and Gram-Positive bacteria with a prevalence of the Firmicutes (Low G + C) division (class Clostridia and Bacillus). Most of the ATAD clones showed affiliation with bacterial species previously isolated or detected in other elevated temperature environments, at alkaline pH, or in cellulose rich environments. Several phylotypes associated with Fe(III)- and Mn(IV)-reducing anaerobes were also detected. The presence of anaerobes was of interest in such large scale systems where sub-optimal aeration and mixing is often the norm while the presence of large amounts of capnophiles suggest the possibility of limited convection and entrapment of CO2 within the sludge matrix during digestion. Comparative analysis with organism identified in other ATAD systems revealed significant differences based on optimised techniques. The abundance of thermophilic, alkalophilic and cellulose-degrading phylotypes suggests that these organisms are responsible for maintaining the elevated temperature at the later stages of the ATAD process. ► Phylogeny presented based on optimised niche specific molecular tools. ► ATAD contains large numbers symbionts, capnophiles and anaerobes. ► Alkalophilic cellulolytic phylotypes are keys to stability of elevated temperature. ► Dataset may have utility in bioaugmentation for improvement of ATAD sludge settling. ► Great dissimilarity in microorganisms between worldwide ATAD systems.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><pmid>22386327</pmid><doi>10.1016/j.watres.2012.01.045</doi><tpages>17</tpages></addata></record>
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subjects Actinobacteria
Actinobacteria - genetics
aeration
aerobic digestion
Aerobiosis
anaerobes
Applied sciences
Autothermal thermophilic aerobic digestion (ATAD)
Bacteria - genetics
bacterial communities
Bacterial community
beta-Proteobacteria
Biodegradation, Environmental
Bioreactors - microbiology
carbon dioxide
Cellulose
clones
Clostridium
CO2
correlation
DNA primers
DNA, Bacterial - isolation & purification
DNA, Ribosomal - genetics
DNA, Ribosomal - isolation & purification
Domestic sludge
Evolution, Molecular
Exact sciences and technology
genes
Gram-positive bacteria
iron
land application
manganese
mixing
Molecular Sequence Data
nucleotide sequences
Phylogenetic analysis
Phylogeny
Pollution
Proteobacteria - genetics
ribosomal DNA
sequence analysis
Sewage - microbiology
sludge
Temperature
Thermophiles
Waste Disposal, Fluid
wastewater
Water Purification - instrumentation
Water Purification - methods
Water treatment and pollution
title Phylogenetic analysis of the bacterial community in a full scale autothermal thermophilic aerobic digester (ATAD) treating mixed domestic wastewater sludge for land spread
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