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    Increasing tetracycline concentrations on the performance and communities of mixed microalgae-bacteria photo-bioreactors

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    Algal_2017_665 accepted version.pdf
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    Description:
    Accepted Manuscript
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    Type
    Article
    Authors
    Xiong, Yanghui cc
    Hozic, Dzenan
    Goncalves, Ana L.
    Simões, Manuel
    Hong, Pei-Ying cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    FCC/1/1971-15-01
    Date
    2017-12-11
    Online Publication Date
    2017-12-11
    Print Publication Date
    2018-01
    Permanent link to this record
    http://hdl.handle.net/10754/626358
    
    Metadata
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    Abstract
    This study investigated the impact of varying concentrations of tetracycline on the performance of mixed microalgae-bacteria photo-bioreactors. Photo-bioreactors were assessed for their ability to remove carbon dioxide (CO2) from the biogas of anaerobic membrane bioreactor (anMBR), and nutrients from the anaerobic effluent. The varying concentrations of tetracycline had no impact on the removal of CO2 from biogas. 29% v/v of CO2 was completely removed to generate >20% v/v of oxygen (O2) in all reactors. Removal of nutrients and biomass was not affected at low concentrations of tetracycline (≤150μg/L), but 20mg/L of tetracycline lowered the biomass generation and removal efficiencies of phosphate. Conversely, high chlorophyll a and b content was observed at 20mg/L of tetracycline. High tetracycline level had no impact on the diversity of 18S rRNA gene-based microalgal communities but adversely affected the 16S rRNA gene-based microbial communities. Specifically, both Proteobacteria and Bacteroidetes phyla decreased in relative abundance but not phylum Chloroplast. Additionally, both nitrogen-fixing (e.g. Flavobacterium, unclassified Burkholderiales and unclassified Rhizobiaceae) and denitrifying groups (e.g. Hydrogenophaga spp.) were significantly reduced in relative abundance at high tetracycline concentration. Phosphate-accumulating microorganisms, Acinetobacter spp. and Pseudomonas spp. were similarly reduced upon exposure to high tetracycline concentration. Unclassified Comamonadaceae, however, increased in relative abundance, which correlated with an increase in the abundance of tetracycline resistance genes associated with efflux pump mechanism. Overall, the findings demonstrate that antibiotic concentrations in municipal wastewaters will not significantly affect the removal of nutrients by the mixed microalgae-bacteria photo-bioreactors. However, utilizing such photo-bioreactors as a polishing step for anMBRs that treat wastewaters with high tetracycline concentration may not be effective as evidenced from the lower nutrient removal and occurrence of antibiotic resistance genes.
    Citation
    Xiong Y, Hozic D, Goncalves AL, Simões M, Hong P-Y (2018) Increasing tetracycline concentrations on the performance and communities of mixed microalgae-bacteria photo-bioreactors. Algal Research 29: 249–256. Available: http://dx.doi.org/10.1016/j.algal.2017.11.033.
    Sponsors
    This work is funded by King Abdullah University of Science and Technology (KAUST) Competitive Center Funding FCC/1/1971-15-01 awarded to Pei-Ying Hong. The authors would like to thank Dr Benjamin C.K. Wong for providing the python script.
    Publisher
    Elsevier BV
    Journal
    Algal Research
    DOI
    10.1016/j.algal.2017.11.033
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S2211926417310391
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.algal.2017.11.033
    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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