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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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Frontiers of Environmental Science & Engineering 2014年第2期8卷 215-225页

作者： Hailiang SONG Xianning LI Wei LI Xiwu LU School of Energy and Environment Southeast University Nanjing 210096 China Engineering Research Center for Water Environmental Protection of Taihu Lake Southeast University Wuxi Branch Wuxi 214135 China

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 contribu- tions 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 compo- nent 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.

关键词： floating-bed Corbicula fluminea biofilm cartier eutrophication

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Biomass Accumulation and Water Purification of Water Spinach Planted on Water Surface by floating beds for Treating Biogas Slurry

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Journal of Environmental Protection 2013年第11期4卷 1230-1235页

作者： Xiaomei Yu Zhaohua Li Sha Zhao Kun Li Hubei Univesity Wuhan China.

To find a new way treating the wastewater from biogas reactors in a pig farm, vegetated floating bed was built for observing the water-purifying capability of water spinach (Ipomoea aquatic) planted on the water surface. Experiments were carried out to record the growth and biomass accumulation of water spinach and its effect on purification of biogas wastewater. The results show that the water which mixed with biogas wastewater has been purified significantly by water spinach on the floating bed. During its growth season within four months, the overall length of water spinach reached 199 ± 35 cm, while its root length reached 63 ± 28.6 cm. The average weight of individual fresh plant is of 1285 ± 619.7 g. Meanwhile, the concentration of total nitrogen (TN) in water under the floating bed decreased from 8.9 ± 0.062 mg·L-1 to 0.5 ± 0.011 mg·L-1;the concentration of total phosphorus (TP) decreased from 4.4 ± 0.236 mg·L-1 to 0.92 ± 0.024 mg·L-1;the concentration of chemical oxygen demand (COD) decreased from 87.3 ± 6.68 mg·L-1 to 0.74 ± 0.46 mg·L-1. It suggests that the water spinach removed more than 90% of pollutants in terms of TN, TP, and COD from the water. Results show that the vegetated floating bed technique is a feasible way to dispose the biogas slurry.

关键词： floating-bed Water Spinach Piggery Wastewater Purification

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