Underground leaching in-situ collection device with plastic boundary

Abstract

The invention discloses an underground leaching in-situ collection device with a plastic boundary. The underground leaching in-situ collection device comprises a leaching collection body and a leaching solution filtering and collection barrel, wherein the leaching collection body is a cylinder with an opening in the top and is formed by enclosing a waterproof soft thin film; an opening end of the leaching solution filtering and collection barrel is matched with a barrel cover and the barrel cover is in an inward concave form; the barrel cover is provided with a plurality of water filtering holes; the leaching solution filtering and collection barrel is arranged on the lower part of the leaching collection body and is connected with the bottom of the leaching collection body; the bottom of the leaching collection body connected with the leaching solution filtering and collection barrel is provided with through holes corresponding to the water filtering holes; the leaching solution filtering and collection barrel is internally provided with a liquid pumping pipe and an air ventilating pipe; the liquid pumping pipe extends to the upper part of the leaching collection body from the bottom of the leaching solution filtering and collection barrel; the air ventilating pipe extends to the upper part of the leaching collection body from the top of the leaching solution filtering and collection barrel. According to the underground leaching in-situ collection device, the elastic waterproof soft thin film is used as the leaching collection body, so that the pool wall effect caused by expansion with heat and contraction with cold can be effectively overcome.

Description

technical field [0001] The invention relates to an underground leaching in-situ collection device with a plastic boundary, which belongs to the technical fields of environmental science, soil science and plant nutrition research. Background technique [0002] Nitrogen, phosphorus, pesticides and other substances in the soil enter the groundwater through leaching, which is not only an important agricultural problem, but also an environmental problem that threatens human health and survival. Studies have shown that: about 30% to 50% of the fertilizers applied to the soil in the world enter the groundwater through soil leaching, and pesticides not only remain in the surface soil, but also leached into the groundwater, even a very small part (so Application of pesticides) leaching into groundwater may pose a threat to groundwater security. In order to protect water resources and aquatic ecosystems, countries around the world are seeking new ways and methods to monitor, manage a...

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Problems solved by technology

[0003] (1) The clay suction cup method can only collect a certain point of soil solution, and cannot test the leaching amount. The calculation results have large deviations, which are difficult to represent the actual situation, and are not suitable for daily monitoring in the field

[0004] (2) Soil column simulation method, there are two forms of undisturbed soil column and backfilled soil column. The area of ​​backfilled soil column is small and cannot accurately reproduce the field environment. Generates dominant flow, leading to excessive bias

[0005] (3) The seepage tank method generally uses concrete, which is similar to the soil in nature, overcomes the shortcomings of the soil column method, and the area has also increased, but it requires the excavation of huge trenches, which requires a large amount of construction and high cost, and is not expensive. Suitable for daily monitoring in the field

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