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Volume 39 Issue 9
Jan.  2022
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ZHAO Qian, ZHUANG Lin-lan, SHENG Qin, ZHANG Jian. ROLE AND DESIGN PRINCIPLES OF SUBSTRATE FOR WASEWATER PURIFICATION IN SUBSURFACE FLOW CONSTRUCTED WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 14-22. doi: 10.13205/j.hjgc.202109003
Citation: ZHAO Qian, ZHUANG Lin-lan, SHENG Qin, ZHANG Jian. ROLE AND DESIGN PRINCIPLES OF SUBSTRATE FOR WASEWATER PURIFICATION IN SUBSURFACE FLOW CONSTRUCTED WETLAND[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(9): 14-22. doi: 10.13205/j.hjgc.202109003

ROLE AND DESIGN PRINCIPLES OF SUBSTRATE FOR WASEWATER PURIFICATION IN SUBSURFACE FLOW CONSTRUCTED WETLAND

doi: 10.13205/j.hjgc.202109003
  • Received Date: 2020-08-01
    Available Online: 2022-01-21
  • The wastewater purification in subsurface flow constructed wetland is realized by the combined functions of substrate, microbes, and plant. Substrate, as an important element, plays critical role in wastewater purification. Firstly, substrate could directly absorb pollutants. The efficiency of pollutant absorbance varies with the substrate material, which is also influenced by the water quality, hydraulic condition, etc. Secondly, substrate could provide the surface for microbes to form biofilm. The properties of substrate, e.g. the material, the saturated/unsaturated condition of substrate, the inner porous structure, and specific surface area, all affect the formation and development of biofilm, as well as the wastewater purification indirectly. Increasing the unsaturated area of substrate, adding the material that could slow-release carbon source, adding Fe-C micro-electrolysis material could improve the removal of ammonia, total nitrogen, and phosphorus by enhancing the oxygen supplement, denitrification process and the chemical sedimentation process, respectively.
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