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Farmland nitrogen and phosphorous non-point source pollution control and recycle system, and method thereof

A non-point source pollution and farmland technology, which is applied in waterway systems, adsorption water/sewage treatment, drainage structures, etc., can solve the problems of N and P element resource utilization, achieve high pollution control efficiency, improve utilization rate, and prevent The effect of eutrophication

Active Publication Date: 2012-11-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the constructed wetland technology only achieves the purpose of pollution prevention and control of N and P elements in farmland, and does not realize the purpose of resource utilization of N and P elements.

Method used

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  • Farmland nitrogen and phosphorous non-point source pollution control and recycle system, and method thereof
  • Farmland nitrogen and phosphorous non-point source pollution control and recycle system, and method thereof
  • Farmland nitrogen and phosphorous non-point source pollution control and recycle system, and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment is suitable for areas with less rainfall (such as figure 2 shown).

[0035] Using the existing main canal 61 as a water storage facility, excavate a rectangular ditch with a length of 20m, a width of 2m, and a depth of 10m between the farmland 1 and the main canal 61, perpendicular to the runoff direction, and fill it with a particle size distribution within the range of 0.02-2mm. The modified diatomite N, P composite adsorbent between them constitutes the adsorption unit 5. Before the adsorption unit 5, a group of wells 41 with a depth of 10m, a radius of 1m, and an interval of 5m are dug to form a water collection facility. When the surface runoff is generated, no surface runoff overflows the adsorption unit, and all of it is collected in the well group 41, and then flows slowly through the adsorption unit. Part of the underground runoff flows through the adsorption unit slowly and slowly, and part of it is collected in the well group 41, and then s...

Embodiment 2

[0040] This embodiment is suitable for areas with greater rainfall (such as image 3 shown).

[0041] Using the existing small reservoir 62 as a water storage facility, between the farmland 1 and the small reservoir 62, a rectangular trench with a length of 30 m, a width of 2 m, and a depth of 8 m is excavated perpendicular to the runoff direction of the farmland to form a water storage facility 4. A rectangular ditch with a width of 3 m, a length of 40 m, and a depth of 8 m is excavated perpendicular to the ditch, and filled with an organic-inorganic attapulgite-based high-efficiency nitrogen-phosphorus composite adsorbent with a particle size distribution in the range of 0.5-5 mm to form an adsorption unit 5 . The surface runoff and underground runoff are all collected in the rectangular ditch, and then seep quickly through the adsorption unit. When flowing through the adsorption unit, N and P are adsorbed and cannot be discharged out of the farmland with the water flow. Th...

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Abstract

The invention relates to a farmland nitrogen and phosphorous non-point source pollution control and recycle system, and a method thereof. The system comprises a water collector, an adsorption unit and a water store which are sequentially arranged from the upstream to the downstream according to farmland surface runoff and underground runoff paths. The water collector, the adsorption unit and the water store are sequentially transversely arranged according to the farmland surface runoff and underground runoff paths, so when rain falls or irrigation is carried out, the farmland water is surplus, meets in the water collector through the farmland surface runoff and underground runoff, the water in the collector continuously downward flows and goes through the adsorption unit, nitrogen (N) and phosphorous (P) are adsorbed, the purified farmland drainage enters the water store, and the superfluous purified drainage is discharged to a river and a lake; and when farmland recharging is carried out, the water which reversely flows goes through the adsorption unit for the N and P desorption, and the desorbed N and P enter the water collector with the water flow, afresh enter the farmland and are adsorbed and utilized by crops. Compared with the prior art, the method has the advantages of pollution control, recycle, fertilizing cost saving and the like.

Description

technical field [0001] The invention relates to the field of agricultural environmental protection, in particular to a technology for controlling and recycling agricultural nitrogen and phosphorus non-point source pollution. Background technique [0002] With the effective control of point source pollution such as industrial wastewater and urban domestic sewage, agricultural non-point source pollution has become an important source of water environment pollution. Among them, nitrogen (N) and phosphorus (P) pollution is a typical type of agricultural non-point source pollution, which is the main substance causing eutrophication of water bodies. The survey shows that in European and American countries, N and P pollution have become the largest pollution sources of rivers and lakes. In Sweden, the Netherlands, and Finland, 60% to 87%, 40% to 60%, and more than 50% come from agricultural non-point source pollution. The situation of N and P pollution in my country's water bodies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28E03F5/00E03F5/10
Inventor 靳强
Owner SHANGHAI JIAO TONG UNIV
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