Initial Deposition and Pioneering Colonization on Polymeric Membranes of Anaerobes Isolated from an Anaerobic Membrane Bioreactor (AnMBR)

Membrane biofouling constitutes a great challenge in anaerobic membrane bioreactor (AnMBR). Here, we studied the initial deposition of anaerobes, the first step in biofilm formation, with a consortium isolated from an AnMBR on membranes with different surface properties and under two shear rate cond...

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Bibliographic Details
Published in:Environmental science & technology 2020-05, Vol.54 (9), p.5832-5842
Main Authors: Yang, Yang, Bogler, Anne, Ronen, Zeev, Oron, Gideon, Herzberg, Moshe, Bernstein, Roy
Format: Article
Language:English
Subjects:
Anaerobes
Archaea
Bacteria
biofilm
Biofilms
Biofouling
Bioreactors
Colonization
Consortia
Deposition
Filtration
hydrodynamics
hydrophilicity
Hydrophobicity
membrane bioreactors
Membranes
Next-generation sequencing
polymers
Properties (attributes)
Shear rate
Statistical analysis
Surface properties
Viscosity
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Summary:Membrane biofouling constitutes a great challenge in anaerobic membrane bioreactor (AnMBR). Here, we studied the initial deposition of anaerobes, the first step in biofilm formation, with a consortium isolated from an AnMBR on membranes with different surface properties and under two shear rate conditions without filtration. We found that the cell transfer coefficient, calculated from the initial deposition experiments, was similar under the two shear rates for the hydrophobic membranes, but much higher under low shear rate and much lower under high shear rate, for the hydrophilic membrane. The cell transfer coefficient measured under filtration mode and at a higher shear rate showed a similar trend. The pioneer bacteria and archaea (without filtration) were identified by next-generation sequencing. The results showed that the selective force for the dissimilarity of the pioneer bacterial and archaeal diversity was the shear rate and the membrane surface properties, respectively. However, statistical analyses revealed minor changes in the pioneer bacteria (class level) and archaea (order level) populations under the various conditions. These results shed light on the first step of biofilm formation on the membranes in AnMBRs and emphasize the importance of hydrodynamic shear and membrane surface properties on the initially deposited anaerobes.
ISSN:0013-936X
1520-5851
1520-5851
DOI:10.1021/acs.est.9b06763