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    The culture of Chlorella vulgaris in a recycled supernatant: Effects on biomass production and medium quality

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    Type
    Article
    Authors
    Hadj-Romdhane, F.
    Zheng, Xing
    Jaouen, Pascal
    Pruvost, Jérémy
    Grizeau, Dominique
    Croue, Jean-Philippe
    Bourseau, Patrick
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-03
    Permanent link to this record
    http://hdl.handle.net/10754/562670
    
    Metadata
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    Abstract
    Reusing supernatant of microalgae culture medium can have inhibitory or toxic effects on the biomass production because of the release of organic metabolites by cells in the culture medium during their growth. This work investigated the impact of Chlorella vulgaris medium recycling on culture productivity, cells quality and accumulation of excreted metabolites in the culture medium. No significant impact on the C. vulgaris growth was observed after 63days of recycling, the productivity remained stable at around 0.55kgm-3day-1. Organic matters accumulated in supernatant were identified as biopolymers (BP) poor in nitrogen and with a size above 40kDa (probably polysaccharides), and small organic molecules (SOM) richer in nitrogen with a molecular size ranging from 1 to 3kDa. The concentration of biopolymers in the supernatant increased till to a maximum and then decreased, possibly consumed by bacteria, whereas small organic compounds accumulated in the medium. © 2013 Elsevier Ltd.
    Sponsors
    The authors thank Helene Marec (GEPEA UMR-CNRS 6144) and Jean-Luc Hauser for photobioreactor design and their technical support.
    Publisher
    Elsevier BV
    Journal
    Bioresource Technology
    DOI
    10.1016/j.biortech.2013.01.025
    PubMed ID
    23411460
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biortech.2013.01.025
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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