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The combined process of ecological aeration tank, multi-stage composite ecological gravel bed and ecological surface flow constructed wetland was used to treat urban micro-polluted water. The primary gravel bed is filled with natural pebbles. The bottom of the second stage of the gravel bed is provided with aeration pipes and microporous aeration discs. A watermelon petal-shaped suspended filler filled with volcanic rocks is installed above the aeration system. The bottom of the third stage of gravel bed is covered with pebbles, and the top is paved with high-efficiency phosphorus removal agent. Monitor the project for four months. The removal rates of COD, NH3-N and TP are 60.97%, 71.85% and 58.33% respectively. This process not only has obvious purification effect on water quality, but also has stable water quality. Compared with the traditional single process system, the combined process increased the removal efficiency of COD and NH3-N by 15–25%, increased the removal efficiency of TP by 10–20%, and shortened the hydraulic retention time (HRT) by 30–40%. The combined process is feasible to improve the water quality of micro-polluted water.

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New Ecological Gravel Bed Composite for Artificial Wetland Combined Process Water Purification

  • 会议论文

  • 发表日期：

    2026年

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  • Fanhu Zeng,
  • Yu Xie,
  • Huaping Long,
  • Zhongyuan Xu,
  • Zhihua Xiao,
  • Yuping Guo,
  • Bin Tan,
  • Qigao Li,
  • Yongbing Huang,
  • Siyu Mei,
  • Shang Ni

摘要

The combined process of ecological aeration tank, multi-stage composite ecological gravel bed and ecological surface flow constructed wetland was used to treat urban micro-polluted water. The primary gravel bed is filled with natural pebbles. The bottom of the second stage of the gravel bed is provided with aeration pipes and microporous aeration discs. A watermelon petal-shaped suspended filler filled with volcanic rocks is installed above the aeration system. The bottom of the third stage of gravel bed is covered with pebbles, and the top is paved with high-efficiency phosphorus removal agent. Monitor the project for four months. The removal rates of COD, NH3-N and TP are 60.97%, 71.85% and 58.33% respectively. This process not only has obvious purification effect on water quality, but also has stable water quality. Compared with the traditional single process system, the combined process increased the removal efficiency of COD and NH3-N by 15–25%, increased the removal efficiency of TP by 10–20%, and shortened the hydraulic retention time (HRT) by 30–40%. The combined process is feasible to improve the water quality of micro-polluted water.