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Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media

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Abstract

A novel floating-bed incorporated with water spinach (Ipomoea aquatica), Asiatic clam (Corbicula fluminea), and carrier media supported biofilm was developed for eutrophic water purification. The contributions of each biologic component to the removals of total nitrogen (TN), total phosphorus (TP) and Chl.a were examined. The nutrient removals due to the direct uptake by either water spinach or Asiatic clam were less than 10%, suggesting a negligible role of biologic assimilation and leaving the biofilm as the indispensable biologic component in the floating-bed. Chl.a was reduced mainly by Asiatic clams via filter-feeding. Meanwhile, the digestion and excretion of Asiatic clams benefited the proliferation of nitrifying and denitrifying bacteria, resulting in the improvement of TN removal. In summary, the synergetic effects of water spinach, Asiatic clams and biofilms would promote the eutrophic water treatment performance of floating-bed in comparison with the conventional floating-bed with vegetation as the single biologic component.

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Authors and Affiliations

  1. School of Energy and Environment, Southeast University, Nanjing, 210096, China

    Hailiang Song, Xianning Li, Wei Li & Xiwu Lu

  2. Engineering Research Center for Water Environmental Protection of Taihu Lake, Southeast University Wuxi Branch, Wuxi, 214135, China

    Hailiang Song, Xianning Li & Xiwu Lu

Authors
  1. Hailiang Song
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  2. Xianning Li
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  3. Wei Li
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  4. Xiwu Lu
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Correspondence to Xianning Li.

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Song, H., Li, X., Li, W. et al. Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media. Front. Environ. Sci. Eng. 8, 215–225 (2014). https://doi.org/10.1007/s11783-013-0587-z

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  • DOI: https://doi.org/10.1007/s11783-013-0587-z

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