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    Polishing of anaerobic secondary effluent by Chlorella vulgaris under low light intensity

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    Type
    Article
    Authors
    Cheng, Tuoyuan cc
    Wei, Chunhai
    Leiknes, TorOve cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2017-05-29
    Online Publication Date
    2017-05-29
    Print Publication Date
    2017-10
    Permanent link to this record
    http://hdl.handle.net/10754/624043
    
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    Abstract
    To investigate anaerobic secondary effluent polishing by microalgae (Chlorella vulgaris) under low light intensity (14 μmol/m2/s), bubbling column reactors were operated in batches of 8 d with initial ammonium nitrogen 10-50 mg/L, initial phosphate phosphorus 2-10 mg/L and microalgal seed 40 mg/L. Maximum microalgal biomass and minimum generation time were 370.9 mg/L and 2.5 d, respectively. Nitrogen removal (maximum 99.6%) was mainly attributed to microalgal growth rate, while phosphorus removal (maximum 49.8%) was related to microalgal growth rate, cell phosphorus content (maximum 1.5%) and initial nutrients ratio. Dissolved microalgal organics release in terms of chemical oxygen demand (maximum 63.2 mg/L) and hexane extractable material (i.e., oil and grease, maximum 8.5 mg/L) was firstly reported and mainly affected by nitrogen deficiency and deteriorated effluent quality. Ultrafiltration critical flux (16.6-39.5 L/m2/h) showed negative linear correlation to microalgal biomass. Anaerobic membrane bioreactor effluent polishing showed similar results with slight inhibition to synthetic effluent.
    Citation
    Cheng T, Wei C-H, Leiknes T (2017) Polishing of anaerobic secondary effluent by Chlorella vulgaris under low light intensity. Bioresource Technology 241: 360–368. Available: http://dx.doi.org/10.1016/j.biortech.2017.05.149.
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Bioresource Technology
    DOI
    10.1016/j.biortech.2017.05.149
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S0960852417308179
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biortech.2017.05.149
    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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