Method for constructing multi-stage subsurface flow constructed wetland system

Abstract

The invention discloses a method for constructing a multi-stage subsurface flow constructed wetland system, and the method comprises the following steps: (1) selecting a littoral zone with a slope as a wetland pond or digging and backfilling to get a wetland pond with a slope; (2) grading and filling a matrix, namely designing stages according to the pollution load and the height difference of slope, and filling the matrix in each stage of the wetland; (3) arranging drainage holes, water outlet holes and water inlet holes; (4) planting plants, namely planting the plants on each stage of the wetland respectively. The method disclosed by the invention has the following beneficial effects: (1) the system constructed by the method has no influence on the coastal zone structure of a landscape water body. (2) the system constructed by the method has a better purification effect on water flowing into rivers and water contaminated by the landscape water body, especially has an obvious purification effect on pollutants such as SS (Stainless Steel), oil and COD (Chemical Oxygen Demand) and has a good removal effect on heavy metals, TN and TP. (3) the system constructed by the present invention can integrate the purification function with the greening of coastal zones, so that the diversity of landscape is enriched and the overall landscape effect is improved.

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