Volume 9 Issue 3
May  2019
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Article Navigation >  Journal of Environmental Engineering Technology  > 2019  >  9(3): 239-244
YAN Bingfei, XIAO Shuhu, LIAO Chungang, DENG Qiyu, LI Dan, LIU Xueyu. Research progress of long-term nitrogen removal in subsurface flow constructed wetlands[J]. Journal of Environmental Engineering Technology, 2019, 9(3): 239-244. doi: 10.12153/j.issn.1674-991X.2019.02.010
Citation: YAN Bingfei, XIAO Shuhu, LIAO Chungang, DENG Qiyu, LI Dan, LIU Xueyu. Research progress of long-term nitrogen removal in subsurface flow constructed wetlands[J]. Journal of Environmental Engineering Technology, 2019, 9(3): 239-244. doi: 10.12153/j.issn.1674-991X.2019.02.010
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Research progress of long-term nitrogen removal in subsurface flow constructed wetlands

doi: 10.12153/j.issn.1674-991X.2019.02.010

  • 1. Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

  • 2. Mianyang Environmental Monitoring Center Station, Mianyang 621000, China

More Information
  • Corresponding author: Xueyu LIU E-mail: liuxueyu@craes.org.cn
  • Received Date: 2018-12-10
  • Publish Date: 2019-05-20
    Abstract
  • Subsurface flow constructed wetlands have the advantages of simple operation, low cost of construction and operation, and good environmental benefits. However, in the long-term operation, the phenomenon of low denitrification efficiency is also common. The mechanism of denitrification in subsurface flow constructed wetland was stated and the main reasons for the decrease of denitrification efficiency in long-term operation were reoxygenation capacity reduction and substrate clogging. Based on extensive literature review, the methods of improving denitrification efficiency by long-term operation of subsurface flow constructed wetlands were summarized. The measures and effects for improving denitrification efficiency were discussed from the aspects of improving reoxygenation capacity of wetland, selecting suitable filler size and gradation, and optimizing subsurface flow wetland process.

     

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