Factors affecting dissolved nitrogen and phosphorus by hydroponic bio-filter method

Xianning Li, Hailiang Song, Xiwu Lu, Osamu Nishimura, Yuhei Inamori

Research output: Contribution to journalArticle

Abstract

The roles of plant absorption, sediment release and denitrification were quantitatively analyzed by indoor simulating tests in order to improve removal effect of hydroponic bio-filter method (HBFM) for dissolved nitrogen and phosphorus. According to the test results, the NH4+-N release from sediment mainly occurs in upper past, and its release rate is 1.6 to 3 times higher than that in middle and lower past. The release rate of PO43--P by sediment is small because of the high level of dissolved oxygen in filter bed water phase. The average absorption rate of nitrogen by plants, nitrogen release rate from sediment and denitrification rate are 352.9, 492.8 and 153.1 mg/(m2·d) respectively. The sum of nitrogen removed by denitrification and plant assimilation is approximately equal to the amount released by sediment. Reducing the nutrient quantity released by sediment through manipulating the period for digging up sediment is necessary to enhance removal ability of HBFM for dissolved nitrogen and phosphorus.

Original languageEnglish
Pages (from-to)792-796
Number of pages5
JournalDongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition)
Volume35
Issue number5
Publication statusPublished - 2005 Sep 1

Keywords

  • Constructed wetland
  • Denitrification
  • Hydroponic bio-filter method
  • Plant absorption
  • Sediment release

ASJC Scopus subject areas

  • Engineering(all)

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