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    Understanding microbial assembly on seawater reverse osmosis membranes to facilitate evaluation of seawater pretreatment options

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    Name:
    Seawater pretreatment evaluation_22072019.pdf
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    Type
    Article
    Authors
    Dehwah, Abdullah cc
    Cheng, Hong cc
    Missimer, Thomas M.
    Hong, Pei-Ying cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Microbial Safety and Biotechnology Lab
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    KAUST Grant Number
    URF/1/2982-01-01
    Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/660980
    
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    Abstract
    Membrane biofouling is the primary cause of inefficiency in seawater reverse osmosis desalination. The identification and subsequent removal of causative microorganisms would therefore be beneficial. To achieve this aim, the assembly of microorganisms onto the reverse osmosis membranes was first modeled to reveal a niche-selective process. Specifically, bacterial genera Hyphomonas, Muricauda, Bacillus and Pseudoruegeria were detected in occurrence frequency higher than predicted, and likely play a role in biofouling due to production of exopolymers. Subsequently, four different pretreatment systems, namely ultrafiltration (UF) membranes, intake wells, dual media filtration and cartridge filters (CF), were evaluated for their log removal efficiencies of these four genera. UF outperformed the others in removing the potential biofouling-associated genera, but intake wells achieved a higher log removal of cell densities. Microbial regrowth, as denoted by an increase in cell numbers, was consistently observed within the CF. Using well intakes provides the highest degree of pretreatment in removing total cells in a chemical-free manner, while UF is the next best process to remove bacteria and organic carbon compounds most responsible for membrane biofouling.
    Citation
    Dehwah, A. H. A., Cheng, H., Missimer, T. M., & Hong, P.-Y. (2019). Understanding microbial assembly on seawater reverse osmosis membranes to facilitate evaluation of seawater pretreatment options. DESALINATION AND WATER TREATMENT, 170, 1–10. doi:10.5004/dwt.2019.24783
    Sponsors
    This study is funded through KAUST Competitive Research Grant URF/1/2982-01-01 awarded to P.-Y.H. The authors thank SAWACO company team, and Eng. Nizar Kammourie, Eng. Najm El-Jafery, Eng. Firas Yaish, Eng. Safwan AL Issa, Mr. Jilly Edisan, Mr. Ronald Llamera, and Mr. Nestro Genterola for access to the facilities and on-site support.
    Publisher
    Desalination Publications
    Journal
    Desalination and Water Treatment
    DOI
    10.5004/dwt.2019.24783
    Additional Links
    https://www.deswater.com/DWT_articles/vol_170_papers/170_2019_1.pdf
    ae974a485f413a2113503eed53cd6c53
    10.5004/dwt.2019.24783
    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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