Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/75700
Title: Operation-driven heterogeneity and overlooked feed-associated populations in global anaerobic digester microbiome
Authors: Mei, R
Nobu, MK
Narihiro, T
Kuroda, K
Sierra, JM
Wu, ZY 
Ye, L
Lee, PKH
Lee, PH 
van Lier, JB
McInerney, MJ
Kamagata, Y
Liu, WT
Keywords: Anaerobic digester
Microbiome
Operation
Feed sludge
Issue Date: 2017
Publisher: IWA Publishing
Source: Water research, 2017, v. 124, p. 77-84 How to cite?
Journal: Water research 
Abstract: Anaerobic digester (AD) microbiomes harbor complex, interacting microbial populations to achieve biomass reduction and biogas production, however how they are influenced by operating conditions and feed sludge microorganisms remain unclear. These were addressed by analyzing the microbial communities of 90 full-scale digesters at 51 municipal wastewater treatment plants from five countries. Heterogeneity detected in community structures suggested that no single AD microbiome could be defined. Instead, the AD microbiomes were classified into eight clusters driven by operating conditions (e.g., pretreatment, temperature range, and salinity), whereas geographic location of the digesters did not have significant impacts. Comparing digesters populations with those present in the corresponding feed sludge led to the identification of a hitherto overlooked feed-associated microbial group (i.e., the residue populations). They accounted for up to 21.4% of total sequences in ADs operated at low temperature, presumably due to ineffective digestion, and as low as 0.8% in ADs with pretreatment. Within each cluster, a core microbiome was defined, including methanogens, syntrophic metabolizers, fermenters, and the newly described residue populations. Our work provides insights into the key factors shaping full-scale AD microbiomes in a global scale, and draws attentions to the overlooked residue populations.
URI: http://hdl.handle.net/10397/75700
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/j.watres.2017.07.050
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