Relationship between microbial community, operational factors and ammonia inhibition resilience in anaerobic digesters at low and moderate ammonia background concentrations

Lu, Y. and Liaquat, R. and Astals, S. and Jensen, P. D. and Batstone, D. J. and Tait, S. (2018) Relationship between microbial community, operational factors and ammonia inhibition resilience in anaerobic digesters at low and moderate ammonia background concentrations. New Biotechnology, 44. pp. 23-30. ISSN 1871-6784

Abstract

The relationship between anaerobic digestion operational conditions and (i) microbial community, (ii) acetoclastic methanogenic activity and (iii) free ammonia (NH3) inhibition resilience was investigated. Thirteen inocula were obtained from full and pilot scale digesters fed with different substrates, digester configurations, operating temperatures and NH3 concentrations (0.1–241 mgN·L−1). Substrate type and temperature were the primary factors influencing microbial community composition. Methanogenic activity ranged from 0.04 to 0.14 gCOD-CH4·g−1VS·day−1, and was significantly correlated with archaeal relative abundance and archaeal community PC2. The variability of NH3 resilience among inocula was moderate, with inhibition threshold values (KI50) ranging between 32 and 175 mgNH3-N·L−1. No microbial or operational factors correlated with NH3 resilience. However, the slopes of inhibition threshold curves were influenced by some environmental factors, namely substrate type, digester temperature and NH3 concentration. Overall, these results indicate that low and moderate background NH3 concentrations is not a key determinant of microbial community nor NH3 resilience.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 18 Feb 2019 04:52
Last Modified: 19 Feb 2019 01:32
Uncontrolled Keywords: anaerobic digestion, inhibition, toxicity, nitrogen, microbial community, acetoclastic methanogenesis
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Identification Number or DOI: 10.1016/j.nbt.2018.02.013
URI: http://eprints.usq.edu.au/id/eprint/35763

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