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Title: Effect of sodium on methanogens in a two-stage anaerobic system
Authors: Xiao, Keke
Maspolim, Yogananda
Zhou, Yan
Guo, Chenghong
Ng, Wun Jern
Keywords: Engineering::Civil engineering
Issue Date: 2022
Source: Xiao, K., Maspolim, Y., Zhou, Y., Guo, C. & Ng, W. J. (2022). Effect of sodium on methanogens in a two-stage anaerobic system. Applied Sciences, 12(3), 956-.
Journal: Applied Sciences 
Abstract: This study evaluated the effects of sodium on anaerobic biomass from the second-stage reactor of a two-stage anaerobic digester. The results indicated that methanogens showed a rela-tively high sodium tolerance of 2.4 g Na+ L−1 . Microbial community analysis showed that viable Methanomicrobiales was the most abundant population by a combined propidium monoazide cross-linking quantitative polymerase chain reaction technique. There was a population shift towards higher abundance of Thermotoga (0.02%), Clostridium (2.50%) and Methanoculleus (13.80%). Biomass activity in relation to increased sodium concentrations was investigated with the adenosine triphos-phate test coupled with extracellular polymeric substances measurement. The results showed biomass activity decreased from 33 to 16 µg g−1 volatile suspended solids as sodium concentrations increased from 1.3 to 9.1 g Na+ L−1 . Higher EPS production, particularly a greater predominance of carbo-hydrates, was stimulated by higher sodium concentrations. This study provides insights into the superiority of sodium tolerance of two-stage anaerobic digester in compared with a single-stage anaerobic system.
ISSN: 2076-3417
DOI: 10.3390/app12030956
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
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