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Microwave and ultrasound pre-treatments influence microbial community structure and digester performance in anaerobic digestion of waste activated sludge
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Microwave and ultrasound pre-treatments influence microbial community structure and digester performance in anaerobic digestion of waste activated sludge
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Journal Article
Microwave and ultrasound pre-treatments influence microbial community structure and digester performance in anaerobic digestion of waste activated sludge
2016
Overview
Comparative analyses of bacterial and archaeal community structures and dynamics in three biogas digesters during start-up and subsequent operation using microwaved, ultrasonicated or untreated waste activated sludge were performed based on 454 pyrosequencing datasets of part of 16S ribosomal RNA sequences and quantitative PCR. The pre-treatment increased the solubility, and thus the availability of the substrate for microbial degradation and significantly affected the succession of the anaerobic community structure over the course of the digestion.
Bacteroidetes
,
Proteobacteria
and
Firmicutes
were the dominant phyla in all digesters throughout operation.
Proteobacteria
decreased in relative abundance from 23–26 % to 11–13 % in association with enhanced substrate availability. Negative correlations between relative abundance of
Alpha
-,
Beta
- and
Gammaproteobacteria
and the substrate availability and/or biogas production were disclosed in statistical analyses.
Clostridiales
was the dominant order in
Firmicutes
, and
Clostridiales
,
Clostridia
and
Firmicutes
relative abundance and richness were shown to positively correlate with substrate availability and biogas generation. Methanogenic communities had a fairly restricted structure, highly dominated by
Methanosaeta
and
Methanobrevibacter
phylotypes. A gradual decline in
Methanobrevibacter
and increased representation of
Methanosaeta concilii
over time were particularly apparent in the digester receiving untreated waste activated sludge, whereas more diversified archaeal communities were maintained in the pre-treatment digesters. The quantitative PCR analyses revealed a methanogenic community distribution that coincided with the 454 pyrosequencing data.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Anaerobiosis - radiation effects
/ Bacteria
/ Bacteroidetes - radiation effects
/ Biofuels
/ Biogas
/ Biomedical and Life Sciences
/ Biotechnological Products and Process Engineering
/ Enzymes
/ Euryarchaeota - radiation effects
/ High-Throughput Nucleotide Sequencing
/ Microbial Consortia - genetics
/ Microbial Consortia - physiology
/ Microbial Consortia - radiation effects
/ Microbial Genetics and Genomics
/ Proteobacteria - radiation effects
/ quantitative polymerase chain reaction
/ Real-Time Polymerase Chain Reaction
/ rRNA 16S
/ Sludge
/ Studies
