Nitrate-contaminated shallow groundwater extraction and irrigation combined repair system

Abstract

Disclosed is a nitrate-contaminated shallow groundwater extraction and irrigation combined repair system. The system is provided with a plurality of repair units, each repair unit is provided with a water pumping well, a submersible pump, a water storage tank and an automatic disconnection switch. The inner diameter of a well pipe of each water pumping well is greater than or equal to 150 mm, the0.9-1m length section downward from the ground surface of each well pipe and the 0.9-1m length section of the bottommost portion of the well pipe are impervious pipes and form an impervious pipe uppersection and an impervious pipe lower section, water stopping material filling layers are arranged between each impervious pipe upper section and a well wall namely the inner wall of a well drilling hole and each impervious pipe lower section and the pipe wall namely the inner wall of the well drilling hole, a middle section between the impervious pipe upper section and the impervious pipe lower section of each well pipe is provided with a water filtering pipe, and a gravel filling layer is arranged between each water filtering pipe and the well wall namely the inner wall of the well drillinghole; the automatic disconnection switch is provided with a cutter switch, a rotatable lever, a connecting rod and a float. The system achieves the purposes of extracting nitrate and other contamination components in groundwater and providing irrigation water sources and nitrogen fertilizer for farmland, and the repair cost is low.

Description

technical field [0001] The invention relates to a groundwater pollution restoration system, in particular to a nitrate-polluted shallow groundwater extraction and irrigation joint restoration system, which is used to treat groundwater pollution. Background technique [0002] Nitrate pollution of groundwater caused by excessive application of nitrogen fertilizers in agricultural production is a worldwide problem, and the more developed the agriculture, the more serious the nitrate pollution of groundwater. Although improving the agricultural planting system and changing common chemical fertilizers to compound fertilizers and slow-release fertilizers can help reduce nitrogen loss, farmers still apply excessive fertilizers under the trend of profit, which makes it difficult to eliminate nitrogen pollution in groundwater. The groundwater in many cities in my country is polluted by nitrates to varying degrees, and the pollution in North China is particularly serious. In the North...

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Problems solved by technology

[0004] The above technologies have not given specific instructions on how to extract nitrate-contaminated shallow groundwater and irrigate the joint restoration system to achieve the purpose of extracting nitrate and other polluting components in groundwater and providing irrigation water and nitrogen fertilizer for farmland at the same time. mentoring program

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