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    A novel storage driven granular post denitrification process: Long-term effects of volume reduction on phosphate recovery

    Access Status
    Fulltext not available
    Authors
    Salehi, S.
    Cheng, K.
    Heitz, Anna
    Ginige, M.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Salehi, S. and Cheng, K. and Heitz, A. and Ginige, M. 2019. A novel storage driven granular post denitrification process: Long-term effects of volume reduction on phosphate recovery. Chemical Engineering Journal. 356: pp. 534-542.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2018.08.139
    ISSN
    1385-8947
    School
    School of Civil and Mechanical Engineering (CME)
    URI
    http://hdl.handle.net/20.500.11937/72940
    Collection
    • Curtin Research Publications
    Abstract

    Anoxic granular biomass with enhanced biological phosphorus (P) removal was used in a post-denitrification configuration to concentrate P in wastewater. The study examined the use of anoxic granules to facilitate application of volume reduction to create a P-enriched stream (>100 mg-P/L). The results indicated the importance of maintaining a food to microorganism (F/M) ratio of ~0.124 g-COD/g-MLSS.d to achieve P and nitrogen (N) removal close to 100%. While granulation required a short settling time and a high-volume exchange ratio, biomass wasting was essential to control the F/M ratio to maintain a suitable microbial diversity and abundance. Diversity and abundance were also impacted by volume reduction, but the effect of this was marginal compared with the effect of decreasing F/M ratio. Furthermore, a decrease in the F/M ratio enhanced sedimentation (SVI5decreased from 55.5 to 32.0 mL/g-MLSS) but decreased dewaterability (capillary suction time increased from 15.5 s to 19.4 s). Recovery of P as a concentrated liquor had minimal impact on the bacterial diversity.

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