Device and method for controlling chemical fertilizer non-point source pollution in paddy field

Abstract

The invention discloses a device and a method for controlling chemical fertilizer non-point source pollution in a paddy field, and relates to the technical field of environmental engineering. The problem that the flushing of farmland overflow water to an artificial wetland cannot be effectively reduced during rainfall is solved. The device comprises a farmland, a wetland is arranged around the farmland and communicates with the farmland through an overflow channel, an emptying port is formed in the lower part of the overflow channel and connected with an emptying pipe, a valve is installed on the emptying pipe and used for being opened when the water level of the wetland reaches the designed upper limit value, a liquid level pipe is installed on one side of the wetland, one end of the liquid level pipe communicates with the lower end in the wetland, the other end of the liquid level pipe is arranged on one side of the upper part of the wetland, a pressure switch is installed at the bottom in the liquid level pipe, the valve is an electromagnetic valve, and the pressure switch is in communication connection with the electromagnetic valve. The device is simple in structure, overflow water can be diverted when the overflow water of a farmland exceeds the upper limit of wetland treatment, the situation that the treatment capacity of the wetland is reduced due to the fact that the wetland is washed and damaged is avoided, the remediation and maintenance cost of the wetland is reduced, and non-point source pollution can be controlled easily.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a device and method for controlling non-point source pollution of paddy field chemical fertilizers. Background technique [0002] The problem of farmland non-point source pollution is an unavoidable reality that must be faced directly in China's agricultural development. Farmland non-point source pollution has become the largest source of pollution in China. The result of farmland non-point source pollution not only directly threatens food quality and food security, but also causes more serious ecological damage to farmland. Some pollution will also make farmland irreparable and permanently lose the value of farmland. If it continues to develop, it will further cause large-scale ecological disasters such as more serious eutrophication of rivers and lakes, increased pesticide residues, severe land compaction, and flooding of water systems with green algae. [0...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a device and method for controlling non-point source pollution of paddy field chemical fertilizers, so as to solve the problem that the erosion of farmland overflow water on constructed wetlands cannot be effectively reduced during rainfall

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