Efficient phosphorus removal ecological ditch for farmland non-point source pollution and paving method thereof

A non-point source pollution and ecological ditch technology, which is applied in the field of farmland non-point source pollution control, can solve secondary pollution and other problems, and achieve the effects of improved stability, good removal effect, and strong water erosion resistance

Active Publication Date: 2020-05-01
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of secondary pollution that may exist in the ecological ditch that removes phosphorus through aquatic plants in the prior art, the present invention provides an efficient phosphorus removal ecological ditch and its paving method for farmland non-point source pollution. The body of the ecological ditch is constructed by laying permeable bricks made of a nitrogen-removing and phosphorus-removing ecological permeable material on the slope. The ecological ditch constructed by using the nitrogen-removing and phosphorus-removing ecological permeable material can purify the water quality, and there is no need to plant special plants for absorbing nitrogen and phosphorus in the water body. aquatic plants

Method used

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  • Efficient phosphorus removal ecological ditch for farmland non-point source pollution and paving method thereof
  • Efficient phosphorus removal ecological ditch for farmland non-point source pollution and paving method thereof
  • Efficient phosphorus removal ecological ditch for farmland non-point source pollution and paving method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] Refer to attached figure 1 And attached figure 2 A high-efficiency phosphorus removal ecological ditch for farmland non-point source pollution in this embodiment includes a ditch body 1, a slope ecological permeable brick 2 located on the side slope of the ditch, and a bottom ecological permeable brick 3 located at the bottom of the ditch. The shape of the cross-section is inverted trapezoidal, which is formed by renovation and excavation on the basis of the existing soil ditches. The ditches here can also be re-excavated according to the actual drainage needs, not limited to the renovation and excavation on the basis of the existing soil ditches. The ditch is formed, wherein the bottom width of the ditch is 70cm, the slope ratio is 1:1.2, the top width is 430cm, and the vertical height from top to bottom is 150cm.

[0052] The slope ecological permeable brick 2 used on the slope of the ecological ditch is a cuboid with a length of 30cm, a width of 30cm and a height o...

Embodiment 2

[0058] The high-efficiency phosphorus removal ecological ditch provided in this example is a further improvement on the basis of the ecological ditch provided in Example 1.

[0059] The main improvement is the laying method at the bottom of the ditch, refer to the attached image 3 .

[0060] This ecological ditch can adopt the bottom ecological permeable brick 3 and the natural soil surface 31 interlaced pavement mode in the ditch bottom construction process similar to the ditch of embodiment 1, the width of the bottom ecological permeable brick 3 is the same as the bottom width of the ditch, and the thickness is 7cm. The length of the pavement can be 70cm, the hole diameter of the ecological permeable brick 3 at the bottom can be 5mm-15mm, or the ecological permeable brick specimen with a length, width and height of 20cm×20cm×7cm can be used for paving, and the implementation length of the natural soil surface 31 can be 30cm , the two along the length direction of the ditch...

Embodiment 3

[0062] The high-efficiency phosphorus removal ecological ditch provided in this example is a further improvement on the basis of the ecological ditch provided in Example 1.

[0063]In this embodiment, an ecological floating bed can be added in the ecological ditch in Embodiment 1. What the bed body adopts is a square bed body of 33cm (long) * 33cm (width) * 3cm (thick), and a plant with a diameter of 15cm is reserved in the middle for planting hole. The plant planted is the economic plant Zizania zizania. The coverage area of ​​the ecological floating bed can account for 30% of the water surface area of ​​the ditch, which can beautify the ecological environment of the ditch while increasing the water purification effect. For some ditches with high drainage requirements, the floating bed can be changed to plant floating plants. Floating plants include any one or more of wild water chestnut, water hyacinth, etc. The planting area of ​​floating plants accounts for 50%-70% of the...

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Abstract

The invention discloses an efficient phosphorus removal ecological ditch for farmland non-point source pollution and a paving method thereof, belonging to the field of farmland non-point source pollution treatment. The efficient dephosphorization ecological ditch for farmland non-point source pollution comprises a ditch body, wherein two side slopes and a bottom which are made of ecological permeable materials are laid on the ditch body, and the permeability coefficient of the ecological permeable material laid at the bottom of the ditch is larger than the permeability coefficient of the ecological permeable material laid on the side slopes of the ditch. The ecological permeable materials capable of slowly releasing calcium and iron ions and having different permeability coefficients are laid on the side slopes and the bottom of the ditch, so phosphate in a water body undergoes chemical precipitation together with calcium and iron ions, and the phosphorus removal effect is achieved. The ecological ditch can improve the phenomenon that phosphorus in surface water exceeds the standard for a long time and reduce the eutrophication degree of the water body.

Description

technical field [0001] The invention belongs to the field of farmland non-point source pollution control, and in particular relates to a farmland ecological ditch and a paving method thereof. Background technique [0002] Farmland non-point source pollution refers to water environment pollution caused by nutrients such as nitrogen and phosphorus and organic or inorganic pollutants such as pesticides and fertilizers passing through farmland surface runoff and farmland seepage during agricultural production activities. At present, farmland non-point source pollution has become the main cause of nitrogen and phosphorus eutrophication in water bodies in my country. Ecological ditches are the main way for farmland drainage to flow into rivers, rivers, and lakes, and their ability to purify farmland non-point source pollutants will directly determine the load of farmland non-point source pollutants into rivers. Therefore, ecological ditches, as one of the main engineering methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/10C02F101/16
CPCC02F3/34C02F2101/105C02F2101/16C02F2103/007Y02W10/10
Inventor 李冬梅王万忠李睿华郑刚
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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