Chequered field drainage control and farmland percolation combined interception and removal system for runoff nitrogen and phosphorus of paddy field and application method of chequered field drainage control and farmland percolation combined interception and removal system

Abstract

The invention discloses a chequered field drainage control and farmland percolation combined interception and removal system for runoff nitrogen and phosphorus of a paddy field. The chequered field drainage control and farmland percolation combined interception and removal system comprises a ridge, an adjustable foldable overflow weir, a percolation tank, a ceramsite percolation layer, a percolation protection slope, an underground horizontal percolation body, straw vertical shafts and a water drainage channel; the ridge is located at the periphery of a chequered field; the adjustable foldable overflow weir is arranged between the ridge and the water drainage channel; the percolation tank is located at a water outlet of the adjustable foldable overflow weir and the ceramsite percolation layer is arranged in the tank; the percolation tank is connected with the macromolecular fiber mesh percolation protection slope; the underground horizontal percolation body is arranged below a plough pan and is formed by covering water-permeable geotextile and crop straw percolation materials on corrugated plastic water drainage underground pipes; deep-layer straw vertical shafts are arranged above the underground pipes and are connected with the underground pipes; shallow-layer straw vertical shafts are arranged between the underground pipes. The invention further discloses an application method of the system. By tightly combining farmland ground surface hydrology regulation and storage and underground percolation with water drainage control, farmland ground surface and underground runoff nitrogen and phosphorus can be comprehensively and efficiently intercepted and removed and the removing rate of pollutants exceeds 70 percent.

Description

technical field [0001] The invention relates to the technical field of farmland non-point source pollution control, in particular to a combined interception and removal system for paddy field runoff nitrogen and phosphorus grid field control and drainage and farmland percolation and an application method thereof. Background technique [0002] my country's agricultural pollution situation is severe, and the water environment is seriously deteriorating. The discharge of nitrogen and phosphorus from farmland runoff is an important reason for the nutrient enrichment of surrounding rivers and lakes. Nitrogen and phosphorus pollution from farmland runoff has distinct characteristics such as potentiality, intermittentity, and large-scale and large-scale areas. Especially in the rice-growing areas in southern my country, the super-heavy rainfall and unreasonable irrigation and drainage have made the problem of farmland pollution more prominent. After long-term cultivation, paddy fi...

AI Technical Summary

Problems solved by technology

Nitrogen and phosphorus pollution from farmland runoff has distinct characteristics such as potentiality, intermittentity, and large-scale and large-scale areas.

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