Ammonia stress on a resilient mesophilic anaerobic inoculum: methane production, microbial community, and putative metabolic pathways

Article


Buhlmann, Christopher H., Mickan, Bede S., Jenkins, Sasha N., Tait, Stephan, Kahandawala, Tharanga K. A. and Bahri, Parisa A.. 2018. "Ammonia stress on a resilient mesophilic anaerobic inoculum: methane production, microbial community, and putative metabolic pathways." Bioresource Technology. 275, pp. 70-77. https://doi.org/10.1016/j.biortech.2018.12.012
Article Title

Ammonia stress on a resilient mesophilic anaerobic inoculum: methane production, microbial community, and putative metabolic pathways

ERA Journal ID3454
Article CategoryArticle
AuthorsBuhlmann, Christopher H. (Author), Mickan, Bede S. (Author), Jenkins, Sasha N. (Author), Tait, Stephan (Author), Kahandawala, Tharanga K. A. (Author) and Bahri, Parisa A. (Author)
Journal TitleBioresource Technology
Journal Citation275, pp. 70-77
Number of Pages8
Year2018
PublisherElsevier
Place of PublicationNetherlands
ISSN0960-8524
1873-2976
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biortech.2018.12.012
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0960852418316560
Abstract

Short term inhibition tests, 16S rRNA tag sequencing and Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt), were employed to visualise the effects of increasing total ammoniacal nitrogen (TAN) concentration (3400–10166 ppm TAN) on microbial community structure and metabolic pathways for acetate degradation. The rate of methane production on acetate was significantly reduced by TAN concentrations above 6133 ppm; however, methane continued to be produced, even at 10166 ppm TAN (0.026 ± 0.0003 gCOD.gVS−1inoculum.day−1). Hydrogenotrophic methanogenesis with syntrophic acetate oxidation (SAO) was identified as the dominant pathway for methane production. A shift towards SAO pathways at higher TAN concentrations and a decrease in the number of ‘gene hits’ for key genes in specific methanogenesis pathways was observed. Overall, the results highlighted potential for inhibition activity testing to be used together with PICRUSt, to estimate changes in microbial metabolism and to better understand microbial resilience in industrial AD facilities.

Keywordsanaerobic digestion; inhibition; methanogenesis; metabolic pathways; PICRUSt
ANZSRC Field of Research 2020401102. Environmentally sustainable engineering
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Byline AffiliationsMurdoch University
University of Western Australia
University of Queensland
Institution of OriginUniversity of Southern Queensland
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