Biogas productivity of anaerobic digestion process is governed by a core bacterial microbiota

Biogas productivity of anaerobic digestion process is governed by a core bacterial microbiota

Tao, Y. (TU Delft Sanitary Engineering; Imperial College London)
Ersahin, M.E. (TU Delft Sanitary Engineering; Istanbul Technical University)
Ghasimi, S.M.D. (TU Delft Sanitary Engineering; University of Kurdistan Hewlêr (UKH))
Ozgun, H. (TU Delft Sanitary Engineering; Istanbul Technical University)
Wang, H. (TU Delft Sanitary Engineering)
Zhang, X. (TU Delft Sanitary Engineering)
Guo, Miao (Imperial College London)
Yang, Yunfeng (Tsinghua University)
Stuckey, David C. (Imperial College London)
van Lier, J.B. (TU Delft Sanitary Engineering)

2020

Anaerobic digestion (AD) has been commercially operated worldwide in full scale as a resource recovery technology underpinning a circular economy. However, problems such as a long start-up time, or system instability, have been reported in response to operational shocks. These issues are usually linked to the dynamics of the functional microbiota in AD. Exploring the microbiota-functionality nexus (MFN) could be pivotal to understand the reasons behind these difficulties, and hence improving AD performance. Here we present a systematic MFN study based on 138 samples taken from 20 well-profiled lab-scale AD reactors operated for up to two years. All the reactors were operated in the same lab within the same period of time using the same methodology to harvest physio-chemical and molecular data, including key monitoring parameters, qPCR, and 16S sequencing results. The results showed a core bacterial microbiota prevailing in all reactor types, including Bacillus, Clostridium, Bacteroides, Eubacterium, Cytophaga, Anaerophaga, and Syntrophomonas, while various methanogens dominated different communities due to different inocula origins, reactor temperatures, or salinity levels. This core bacterial microbiota well correlated with biogas production (Pearson correlation coefficient of 0.481, p < 0.0001). Such strong correlation was even comparable to that between the biogas production and the methanogenic 16S rRNA gene content (Pearson correlation coefficient of 0.481, p < 0.0001). The results indicated that AD performance only modestly correlated with microbial diversity, a key governing factor. AD microbiota was neither functionally redundant nor plastic, and a high variety in communities can exhibit a strong difference in reactor performance. Our study demonstrates the importance of a core bacterial microbiota in AD and supports inspiring considerations for design, bioaugmentation, and operational strategies of AD reactors in the future.

Anaerobic digestion
Biogas
Bioreactor
Microbiota

http://resolver.tudelft.nl/uuid:2614350a-026a-488b-824d-a5eb52f9ae25

https://doi.org/10.1016/j.cej.2019.122425

2020-02-05

1385-8947

Chemical Engineering Journal, 380

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2020 Y. Tao, M.E. Ersahin, S.M.D. Ghasimi, H. Ozgun, H. Wang, X. Zhang, Miao Guo, Yunfeng Yang, David C. Stuckey, J.B. van Lier