Method for improving capability of hardened ditch in removing nitrogen-phosphorus contaminations in tail water of farmland

Abstract

The invention discloses a method for improving the capability of a hardened ditch in removing nitrogen-phosphorus contaminations in tail water of farmland. The method comprises the following concrete steps: constructing a plurality of small filler-plant treating units in the ditch along the two sidewalls of the ditch and arranging an elevating dam at the tail end of the trench, wherein each of the small filler-plant treating units successively comprises an adsorption filler water-permeable dam and a pine pile vegetation zone along a water flow direction, and the adsorption filler water-permeable dam and the pine pile vegetation zone are closely bonded. According to the invention, the tail water of the farmland is allowed to fully contact with water plants and an adsorption filler, so plant absorption, microbial degradation and filler adsorption of contaminations in the ditch are reinforced; the height of the elevating dam can be adjusted according to changing between an irrigation period and a non-irrigation period, so the ditch is rapidly switchable between a flood draining function and a contamination treating function; thus, the hardened ditch is reconstructed into a ditch with good capability in removing nitrogen-phosphorus contaminations and realizes removal of non-point source agricultural pollution.

Description

technical field [0001] The invention relates to a method for improving the ability of hardened ditches to remove nitrogen and phosphorus pollution from farmland tail water. Background technique [0002] In the process of agricultural production, due to the large application of nitrogen and phosphorus fertilizers, the nitrogen and phosphorus content of farmland tail water is high. If the farmland tail water is directly discharged, it will bring eutrophication hidden dangers to subsequent receiving water bodies. Traditional soil ditches are rich in animals, plants, and microorganisms. As water flow channels between farmland and receiving water bodies, through a series of actions such as soil adsorption, plant absorption, and microbial degradation, they have a certain purification function for nitrogen and phosphorus pollution in farmland tail water. However, due to problems such as overgrown weeds, soil erosion and poor water flow in the traditional soil ditch, it was abandone...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the farmland tailwater discharge ditches are hardened ditches with three sides of light. The problems of the hardened ditches are: there are basically no plants growing and the water flow is fast, so it is difficult to remove pollutants such as nitrogen and phosphorus in the farmland tailwater.

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