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Three-dimensional stratification of bacterial biofilm populations in a moving bed biofilm reactor for nitritation-anammox.

Artikel i vetenskaplig tidskrift
Författare Robert Almstrand
Frank Persson
Holger Daims
Maria Ekenberg
Magnus Christensson
Britt-Marie Wilén
Fred Sörensson
Malte Hermansson
Publicerad i International Journal of Molecular Sciences
Volym 15
Nummer/häfte 2
Sidor 2191-206
ISSN 1422-0067
Publiceringsår 2014
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 2191-206
Språk en
Länkar dx.doi.org/10.3390/ijms15022191
https://gup.ub.gu.se/file/131087
Ämnesord moving bed biofilm reactor (MBBR); nitritation; anammox; AOB; wastewater; biofilm; stratification
Ämneskategorier Mikrobiologi, Vattenbehandling

Sammanfattning

Moving bed biofilm reactors (MBBRs) are increasingly used for nitrogen removal with nitritation-anaerobic ammonium oxidation (anammox) processes in wastewater treatment. Carriers provide protected surfaces where ammonia oxidizing bacteria (AOB) and anammox bacteria form complex biofilms. However, the knowledge about the organization of microbial communities in MBBR biofilms is sparse. We used new cryosectioning and imaging methods for fluorescence in situ hybridization (FISH) to study the structure of biofilms retrieved from carriers in a nitritation-anammox MBBR. The dimensions of the carrier compartments and the biofilm cryosections after FISH showed good correlation, indicating little disturbance of biofilm samples by the treatment. FISH showed that Nitrosomonas europaea/eutropha-related cells dominated the AOB and Candidatus Brocadia fulgida-related cells dominated the anammox guild. New carriers were initially colonized by AOB, followed by anammox bacteria proliferating in the deeper biofilm layers, probably in anaerobic microhabitats created by AOB activity. Mature biofilms showed a pronounced three-dimensional stratification where AOB dominated closer to the biofilm-water interface, whereas anammox were dominant deeper into the carrier space and towards the walls. Our results suggest that current mathematical models may be oversimplifying these three-dimensional systems and unless the multidimensionality of these systems is considered, models may result in suboptimal design of MBBR carriers.

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