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    Enhancement of nitrate removal at the sediment-water interface by carbon addition plus vertical mixing

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    Xuechu-Enhancement of nitrate removal at the sediment-water interface by carbon addition plus vertical mixing.pdf (474.4Kb)
    Date
    2014-12
    Author
    Chen, Xuechu  Concept link
    He, Shengbing  Concept link
    Zhang, Yueping  Concept link
    Huang, Xiaobo  Concept link
    Huang, Yingying  Concept link
    Chen, Danyue  Concept link
    Huang, Xiaochen  Concept link
    Tang, Jianwu  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/7044
    As published
    https://doi.org/10.1016/j.chemosphere.2014.12.010
    Keyword
     Nitrate removal; Sediment-water interface; Carbon addition; Vertical mixing 
    Abstract
    Wetlands and ponds are frequently used to remove nitrate from effluents or runoffs. However, the efficiency of this approach is limited. Based on the assumption that introducing vertical mixing to water column plus carbon addition would benefit the diffusion across the sediment–water interface, we conducted simulation experiments to identify a method for enhancing nitrate removal. The results suggested that the sediment-water interface has a great potential for nitrate removal, and the potential can be activated after several days of acclimation. Adding additional carbon plus mixing significantly increases the nitrate removal capacity, and the removal of total nitrogen (TN) and nitrate-nitrogen (NO3--N) is well fitted to a first-order reaction model. Adding Hydrilla verticillata debris as a carbon source increased nitrate removal, whereas adding Eichhornia crassipe decreased it. Adding ethanol plus mixing greatly improved the removal performance, with the removal rate of NO3--N and TN reaching 15.0-16.5 g m-2 d-1. The feasibility of this enhancement method was further confirmed with a wetland microcosm, and the NO3--N removal rate maintained at 10.0-12.0 g m-2 d-1 at a hydraulic loading rate of 0.5 m d-1.
    Description
    Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Chemosphere 136 (2015): 305-310, doi:10.1016/j.chemosphere.2014.12.010.
    Collections
    • Ecosystems Center
    Suggested Citation
    Preprint: Chen, Xuechu, He, Shengbing, Zhang, Yueping, Huang, Xiaobo, Huang, Yingying, Chen, Danyue, Huang, Xiaochen, Tang, Jianwu, "Enhancement of nitrate removal at the sediment-water interface by carbon addition plus vertical mixing", 2014-12, https://doi.org/10.1016/j.chemosphere.2014.12.010, https://hdl.handle.net/1912/7044
     

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