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Combined Deterministic and Stochastic Processes Control Microbial Succession in Replicate Granular Biofilm Reactors

Artikel i vetenskaplig tidskrift
Författare R. Liebana
O. Modin
F. Persson
E. Szabo
Malte Hermansson
B. M. Wilen
Publicerad i Environmental Science & Technology
Volym 53
Nummer/häfte 9
Sidor 4912-4921
ISSN 0013-936X
Publiceringsår 2019
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 4912-4921
Språk en
Länkar dx.doi.org/10.1021/acs.est.8b06669
Ämnesord community structure, bacterial communities, population-dynamics, aerobic, granulation, diversity, waste, water, performances, biogeography, generation
Ämneskategorier Miljöteknik, Miljövetenskap

Sammanfattning

Granular sludge is an efficient and compact biofilm process for wastewater treatment. However, the ecological factors involved in microbial community assembly during the granular biofilm formation are poorly understood, and little is known about the reproducibility of the process. Here, three replicate bioreactors were used to investigate microbial succession during the formation of granular biofilms. We identified three successional phases. During the initial phase, the successional turnover was high and alpha-diversity decreased as a result of the selection of taxa adapted to grow on acetate and form aggregates. Despite these dynamic changes, the microbial communities in the replicate reactors were similar. The second successional phase occurred when the settling time was rapidly decreased to selectively retain granules in the reactors. The influence of stochasticity on succession increased and new niches were created as granules emerged, resulting in temporarily increased alpha-diversity. The third successional phase occurred when the settling time was kept stable and granules dominated the biomass. Turnover was low, and selection resulted in the same abundant taxa in the reactors, but drift, which mostly affected low-abundant community members, caused the community in one reactor to diverge from the other two. Even so, performance was stable and similar between reactors.

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Denna text är utskriven från följande webbsida:
http://www.gu.se/forskning/publikation/?publicationId=281105
Utskriftsdatum: 2019-08-24