Biomethanation and microbial community changes in a digester treating sludge from a brackish aquaculture recirculation system

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Title: Biomethanation and microbial community changes in a digester treating sludge from a brackish aquaculture recirculation system
Author(s): Zhang, X
Tao, Y
Hu, J
Liu, G
Spanjers, H
Van Lier, JB
Item Type: Journal Article
Abstract: Using a high-salinity-adapted inoculum and a moderate stepwise-increased organic loading rate (OLR), a stable digester performance was achieved in treating sludge from a brackish aquaculture recirculation system. The specific methane yield was distinctly enhanced, reaching 0.203 L CH4/g CODadded, compared to literature values (0.140–0.154 L CH4/g CODadded) from the salty sludges. OLR adjustment and the fecal substrate substantially influenced population changes in the digester. Within the bacterial subpopulations, the relative abundance of Bacillus and Bacteroides declined, accompanied by the increase of Clostridium and Trigonala over time. The results show Trigonala was derived from the substrate and accumulated inside the digester. The most abundant methanogen was Methanosarcina in the inoculum and the digestates. The Methanosarcina proliferation can be ascribed to its metabolic versatility, probably a feature of crucial importance for high-salinity environments. Other frequently observed methanogens were outcompeted. The population similarity at the genus level between inoculum and digestates declined during the initial stage and afterwards increased.
Publication Date: 28-Apr-2016
Date of Acceptance: 21-Apr-2016
URI: http://hdl.handle.net/10044/1/44187
DOI: https://dx.doi.org/10.1016/j.biortech.2016.04.120
ISSN: 1873-2976
Publisher: Elsevier
Start Page: 338
End Page: 347
Journal / Book Title: Bioresource Technology
Volume: 214
Copyright Statement: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Keywords: Science & Technology
Life Sciences & Biomedicine
Technology
Agricultural Engineering
Biotechnology & Applied Microbiology
Energy & Fuels
Agriculture
Anaerobic digestion
Brackish aquaculture recirculation systems
Stepwise increased OLR
Sludge retention time (SRT)
Inoculum
Bacterial and archaeal population
MESOPHILIC ANAEROBIC TREATMENT
RETENTION TIME
CO-DIGESTION
SOLID-WASTE
BACTERIAL
VERRUCOMICROBIA
INHIBITION
AMMONIA
REACTOR
MANURE
Anaerobic digestion
Bacterial and archaeal population
Brackish aquaculture recirculation systems
Inoculum
Sludge retention time (SRT)
Stepwise increased OLR
Ammonium Compounds
Aquaculture
Archaea
Bacteria
Batch Cell Culture Techniques
Biodegradation, Environmental
Biodiversity
Biofuels
Bioreactors
Hydrogen-Ion Concentration
Methane
Phylogeny
Salinity
Sewage
Biotechnology
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Faculty of Engineering
Chemical Engineering



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