Method for treating farmland non-point source polluted water by using local deep ecological ditch

Abstract

The invention provides a method for treating farmland non-point source polluted water by using a local deep ecological ditch. The method comprises the following steps: (1) constructing the local deepecological ditch in an ecological ditch, and arranging a shallow water section and a deep water section, wherein the shallow water section is provided with a mud-blocking and water-blocking short embankment, and a plurality of water treatment units are arranged in the middle of the deep water section; (2) planting small aquatic plants with developed root systems in a lower water-passing blocking planting groove, planting medium-sized aquatic plants with developed root systems in an upper water-passing blocking planting groove, and planting high emergent aquatic plants between the lower water-passing blocking planting groove and the upper water-passing blocking planting groove; and (3) forming a continuous zigzag water flow path when the farmland non-point source polluted water flows through the local deep ecological ditch, thereby realizing the removal of nitrogen and phosphorus, namely completing the treatment of the farmland non-point source polluted water. According to the method, the lowest water level of the shallow water section of the local deep ecological ditch can be kept, so growth of aquatic plants is facilitated, and the capacity of removing and purifying non-point source pollutants, i.e., nitrogen and phosphorus, can be enhanced.

Description

technical field [0001] The invention relates to a method for treating farmland non-point source polluted water by local deep-water ecological ditches. Background technique [0002] 1. Overview of ecological ditches [0003] Ditch is an important part of the farmland system, and it is the channel through which the surface runoff of farmland flows into lakes and rivers. Farmland drainage ditches with bottom mud and aquatic plants are generally called farmland ecological ditches. The plant-sediment-microbial system in the ecological ditch enables the ditch to perform a function similar to that of an ecological wetland during the base flow period with slow water flow. [0004] In ecological ditches, through the functions of sediment interception, plant absorption and microbial decomposition, it can effectively reduce the concentration of nitrogen and phosphorus carried in runoff, and achieve "three cleanups" (removal of garbage, silt, and weeds) and "three interceptions" ( in...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for local deep-water ecological ditches to treat farmland non-point source polluted water bodies, so as to solve the non-point source pollution caused by ecological ditches in relatively flat farmland areas because the water flow is too shallow and cannot be combined to plant large, medium and small aquatic plants. Insufficient nitrogen and phosphorus removal and purification capacity

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