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

Hailiang SONG, Xianning LI, Wei LI, Xiwu LU

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Front. Environ. Sci. Eng. ›› 2014, Vol. 8 ›› Issue (2) : 215-225. DOI: 10.1007/s11783-013-0587-z
RESEARCH ARTICLE

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.

Keywords

floating-bed / Corbicula fluminea / biofilm carrier / eutrophication

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Hailiang SONG, Xianning LI, Wei LI, Xiwu LU. Role of biologic components in a novel floating-bed combining Ipomoea aquatic, Corbicula fluminea and biofilm carrier media. Front Envir Sci Eng, 2014, 8(2): 215‒225 https://doi.org/10.1007/s11783-013-0587-z

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant Nos. 20877018 and 51109038) and partly by the Major Science and Technology Program for Water Pollution Control and Treatment (Grant Nos. 2009ZX07101-011 and 2009ZX07101-009-04).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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