Biomass Accumulation and Water Purification of Water Spinach Planted on Water Surface by Floating Beds for Treating Biogas Slurry
Xiaomei Yu, Zhaohua Li, Sha Zhao, Kun Li
Hubei Univesity, Wuhan, China..
DOI: 10.4236/jep.2013.411141   PDF    HTML     4,378 Downloads   7,302 Views   Citations


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.

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X. Yu, Z. Li, S. Zhao and K. Li, "Biomass Accumulation and Water Purification of Water Spinach Planted on Water Surface by Floating Beds for Treating Biogas Slurry," Journal of Environmental Protection, Vol. 4 No. 11, 2013, pp. 1230-1235. doi: 10.4236/jep.2013.411141.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] P. Zhou and H. Q. Yang, “Research of Diagnosis Method to Engine Driving Force Insufficient,” Journal of Agricultural Mechanization Research, Vol. 4, No. 4, 2011, pp. 334-336
[2] H. L. Gao, “Effects of Biogas Fertilizer on Output and Quality of Brassica Chinensis and Soil Quality,” Journal of Agro-Environment Science, Vol. 29, No. 5, 2010, pp. 43-47.
[3] J. Zhang, W. Huang and L. H. Sang, “The Water Purification Ability of Plants on Floating Bed and Its Influencing Factors,” Journal of Yangtze River Scientific Research Institute, Vol. 28, No. 12, 2011, pp. 242-245.
[4] L. M. Wu, H. B. Cong and X. F. Wang, “Effect of Three Kinds of Floating-Bed Plants and Artificial Plants on Nitrogen and Phosphorus Removal in Water,” Environmental Science and Technology, Vol. 23, No. 3, 2012, pp. 12-16.
[5] D. W. Xu, L. N. Chen and Q. Ma, “Application and Research Process of Ecological Floating Bed Technology,” China Water & Wastewater, Vol. 26, No. 14, 2006, pp. 11-15.
[6] P. Dai, X. G. Wu, W. H. Zhang and X. F. Zhang, “Development in the Study of Man-Made Floating Culture Islands’ Carrie,” Environmental Science and Management, Vol. 5, 2007, pp. 85-87.
[7] “Analysis Method of Water or Wastewater,” 4th Edition, China Environmental Science Press, 2002.
[8] G. P. Gu, L. Y. Zhou and S. Wang, “Primary Study on the Removal Efficiency of Nitrogen and Phosphorus of Eutrophic Water Body by Planted Float Ipomoea Aquatica Forsk,” Auhui Agricultural Science Bulletin, Vol. 14, No. 19, 2008, pp. 134-137.
[9] H. Xu, H. Z. Chen, Q. Q. Xiong and B. Z. Wang, “Studies on the Efficiencies and Mechanisms of N and P Removal in Macrohydrophyte Ponds,” Journal of Harbin University of C.E. & Architecture, Vol. 32, No. 4, 1999, pp. 33-47.

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