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    Aggregation ability of three phylogenetically distant anammox bacterial species

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    Type
    Article
    Authors
    Ali, Muhammad
    Shaw, Dario Rangel
    Zhang, Lei
    Haroon, Mohamed Fauzi
    Narita, Yuko
    Emwas, Abdul-Hamid M.
    Saikaly, Pascal cc
    Okabe, Satoshi
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    NMR
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    CRG_R2_13_SAIK_KAUST_1
    Date
    2018-06-12
    Online Publication Date
    2018-06-12
    Print Publication Date
    2018-10
    Permanent link to this record
    http://hdl.handle.net/10754/628290
    
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    Abstract
    Anaerobic ammonium-oxidizing (anammox) bacteria are well known for their aggregation ability. However, very little is known about cell surface physicochemical properties of anammox bacteria and thus their aggregation abilities have not been quantitatively evaluated yet. Here, we investigated the aggregation abilities of three different anammox bacterial species: “Candidatus Brocadia sinica”, “Ca. Jettenia caeni” and “Ca. Brocadia sapporoensis”. Planktonic free-living enrichment cultures of these three anammox species were harvested from the membrane bioreactors (MBRs). The physicochemical properties (e.g., contact angle, zeta potential, and surface thermodynamics) were analyzed for these anammox bacterial species and used in the extended DLVO theory to understand the force-distance relationship. In addition, their extracellular polymeric substances (EPSs) were characterized by X-ray photoelectron spectroscopy and nuclear magnetic resonance. The results revealed that the “Ca. B. sinica” cells have the most hydrophobic surface and less hydrophilic functional groups in EPS than other anammox strains, suggesting better aggregation capability. Furthermore, aggregate formation and anammox bacterial populations were monitored when planktonic free-living cells were cultured in up-flow column reactors under the same conditions. Rapid development of microbial aggregates was observed with the anammox bacterial population shifts to a dominance of “Ca. B. sinica” in all three reactors. The dominance of “Ca. B. sinica” could be explained by its better aggregation ability and the superior growth kinetic properties (higher growth rate and affinity to nitrite). The superior aggregation ability of “Ca. B. sinica” indicates significant advantages (efficient and rapid start-up of anammox reactors due to better biomass retention as granules and consequently stable performance) in wastewater treatment application.
    Citation
    Ali M, Shaw DR, Zhang L, Haroon MF, Narita Y, et al. (2018) Aggregation ability of three phylogenetically distant anammox bacterial species. Water Research 143: 10–18. Available: http://dx.doi.org/10.1016/j.watres.2018.06.007.
    Sponsors
    This research financially supported by Nagase Science and Technology Foundation and Institute for Fermentation, Osaka (IFO), which were granted to Satoshi Okabe, and by Competitive Research Grant (CRG_R2_13_SAIK_KAUST_1) from King Abdullah University of Science and Technology (KAUST). Lei Zhang was supported partly by the Monbukagakusho Honors Scholarship for Privately Financed International Students offered by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. When Muhammad Ali was a Post-Doctoral Fellow at Hokkaido University, Sapporo Japan, he was supported by Graduate School of Engineering, Hokkaido University, Japan.
    Publisher
    Elsevier BV
    Journal
    Water Research
    DOI
    10.1016/j.watres.2018.06.007
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0043135418304512
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.watres.2018.06.007
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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