1. An agricultural non-point source pollution ecological interception system comprises at least one agricultural ditch (7), wherein a water distribution channel (8) communicated with the agricultural ditch (7) is arranged at the output end of the agricultural ditch (7), and a grid (9) for blocking sundries with large volume is arranged at the joint of the agricultural ditch (7) and the water distribution channel (8); the method is characterized in that: the water-saving irrigation system is characterized by further comprising pine piles (1) inserted into the river bank ramp, the pine piles (1) and the river bank ramp form a river channel ditch (2), water seepage cloth (3) is placed in the river channel ditch (2), a backfill soil layer (4) and a bone material layer (5) are respectively filled in the water seepage cloth (3) from top to bottom, a plurality of water collecting pipes (10) used for collecting filtered water are installed below the bone material layer (5), the end parts of the water collecting pipes (10) are communicated with a water storage tank (11) placed at the end parts of the river channel ditch (2), a liquid level measuring instrument (13) and a water pump (12) used for conveying the filtered water to a farmland are installed in the water storage tank (11), the liquid level measuring instrument (13) is installed on the side wall of the water storage tank (11), and the water pump (12) conveys the water in the water storage tank (11) to the farmland according to signals fed back by the liquid level measuring instrument (13); an aquatic plant layer (6) is planted on the backfill soil layer (4), the water distribution channel (8) is arranged on the backfill soil layer (4), and a plurality of water distribution holes (81) are arranged on the side wall of the water distribution channel (8) facing the aquatic plant layer (6).

2. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the width of the water distribution channel (8) is w, w is more than or equal to 20cm and less than or equal to 30cm, the axes of all the water distribution holes (81) are on the same horizontal plane, and the interval between the adjacent water distribution holes (81) is 2 m.

3. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the width of the top opening of the river channel (2) is s, and s is more than or equal to 1.5m and less than or equal to 2 m.

4. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the aggregate layer (5) comprises a crushed stone layer (51) and a ceramsite layer (52), the crushed stone layer (51) is arranged above the ceramsite layer (52), the diameter of crushed stone in the crushed stone layer (51) is between 1mm and 10mm, and the diameter of ceramsite in the ceramsite layer (52) is between 3mm and 5 mm.

5. The ecological intercepting system of agricultural non-point source pollution according to claim 4, characterized in that: the gaps between adjacent broken stones in the crushed stone layer (51) are filled with zeolite or volcanic rock.

6. The ecological intercepting system of agricultural non-point source pollution according to claim 4, characterized in that: the gaps between the adjacent ceramic grains in the ceramic grain layer (52) are filled with zeolite or volcanic rock.

7. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the water permeable cloth (3) is water permeable geotextile, and the thickness of the water permeable cloth (3) is between 1mm and 2 mm.

8. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the surface of the pine pile (1) is covered with a carbonization layer.

9. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the water collecting pipe (10) is a PE pipe, the pipe diameter of the water collecting pipe (10) is 50mm, water collecting holes used for collecting filtered water are formed in the water collecting pipe (10), and the gradient of arrangement of the water collecting pipe (10) is 3 per thousand.

10. The ecological intercepting system of agricultural non-point source pollution according to claim 1, characterized in that: the water reservoir (11) is formed by surrounding pine piles, and the depth of the water reservoir (11) is 2-3 m.

Background

The ecological ditch has a good purification effect on agricultural non-point source pollutants, and is a technical means for effectively controlling agricultural non-point source pollution, which is suitable for national conditions and regional characteristics of China. The farmland ditches in China are numerous and uniform, and if the ditch wetland with the intercepting function is built by utilizing the existing farmland ditches, the risk that the farmland runs off N, P and enters water can be reduced. However, when rainstorm occurs, the drainage quantity of the channel is large, the hydraulic retention time is short, the absorption and interception effects of the ecological channel on nitrogen and phosphorus are greatly reduced, a large amount of high-concentration farmland drainage directly enters a river channel or a subsequent water treatment unit, and the pollutant load of the river channel or the subsequent water treatment unit is greatly increased. How to guarantee to reduce the concentration of nitrogen phosphorus pollutant before torrential rain runoff enters the river course becomes the problem that needs urgent solution at present.

At present, ditches are dug between farmlands and riverways, for example, a renewable filler-plant combined ditch-slope protection nitrogen and phosphorus ecological interception system with application number of 201511031431.5 discloses that concrete impermeable building blocks are tightly arranged on the peripheral wall and the bottom of the ditch through the connection of bumps and grooves, leakage is effectively prevented, slope protection plants or aquatic plants are planted in hollow parts, and dense plant stems, leaves and roots can effectively filter and intercept suspended matters in farmland runoff and absorb intercepted nutrients such as nitrogen and phosphorus. Meanwhile, a ditch packing layer is laid at the bottom of the ditch, so that the formation and growth of a biological film are facilitated. Such interception systems are too costly and the purification effect is not particularly desirable.

Disclosure of Invention

Aiming at the defect of high cost of an ecological interception system in the prior art, the invention provides an agricultural non-point source pollution ecological interception system.

In order to solve the technical problem, the invention is solved by the following technical scheme:

an agricultural non-point source pollution ecological interception system comprises at least one agricultural ditch, wherein a water distribution channel communicated with the agricultural ditch is arranged at the output end of the agricultural ditch, and a grid for blocking sundries with larger volume is arranged at the joint of the agricultural ditch and the water distribution channel; the water level measuring device is characterized by further comprising pine piles inserted into the river bank ramp, the pine piles and the river bank ramp form a river channel ditch, water seepage cloth is placed in the river channel ditch, a backfill soil layer and a bone material layer are respectively filled in the water seepage cloth from top to bottom, a plurality of water collecting pipes used for collecting filtered water are installed below the bone material layer, the end portions of the water collecting pipes are communicated with a water reservoir placed at the end portion of the river channel ditch, a liquid level measuring instrument and a water pump used for conveying the filtered water to a farmland are installed in the water reservoir, the liquid level measuring instrument is installed on the side wall of the water reservoir, and the water pump conveys the water in the water reservoir into the farmland according to signals fed back by the liquid level measuring instrument; the backfill soil layer is planted with an aquatic plant layer, the water distribution channel is arranged on the backfill soil layer, and the side wall of the water distribution channel facing the aquatic plant layer is provided with a plurality of water distribution holes. This ecological interception system adopts multistage interception to filter the farmland water, and the farmland water can also be by recycle after being filtered, improves the utilization ratio of water resource. Meanwhile, the river channel is formed simply, people only need to insert the treated pine piles into the river bank ramp side by side, the river channel does not need to be dug by a traditional intercepting system, and then concrete is paved. Farmland water flowing into water along the river bank can be decomposed and purified by the aquatic plants, and the aggregate layer is used for assisting the aquatic plants in purifying the farmland water and can adsorb harmful elements, bacteria and mineralized water quality in the farmland water. The collector pipe can collect the farmland water after filtering and carry the cistern in, the cistern can be carried the filtrating water in it for the farmland through the water pump and carry out the secondary irrigation.

Preferably, the width of the water distribution channel is w, w is more than or equal to 20cm and less than or equal to 30cm, the axes of all the water distribution holes are on the same horizontal plane, and the interval between the adjacent water distribution holes is 2 m. The water distribution channel with the moderate width is convenient for people to clean deposited silt in the water distribution channel, and the water distribution holes are used for conveying deposited farmland water to the aquatic plant layer.

Preferably, the width of the opening at the top of the river channel is s, and s is more than or equal to 1.5m and less than or equal to 2 m. The river channel ditch with the moderate width is convenient to form, the depth of the pine piles inserted into the river channel ramp is controllable, and the installation stability of the pine piles is controllable.

Preferably, the aggregate layer comprises a crushed stone layer and a ceramsite layer, and the crushed stone layer is arranged above the ceramsite layer. The macadam can prolong the water flow path of the farmland water, so that the purification time of the ecological interception system on the farmland water is prolonged, the ceramsite can adsorb harmful elements, bacteria and mineralized water in the farmland water, and the macadam and the ceramsite are matched for use to improve the purification effect of the farmland water.

Preferably, the diameter of the crushed stone in the crushed stone layer is between 1mm and 10mm, and the diameter of the ceramsite in the ceramsite layer is between 3mm and 5 mm. Within the diameter range, the crushed stone water-fixing effect is better, the quantity of the ceramsite is large, the gap between the adjacent ceramsite is small, and the purifying effect of the ceramsite layer is better.

Preferably, the gaps between adjacent crushed stones in the crushed stone layer are filled with zeolite or volcanic rock. The crushed stone layer fixes water in the crushed stone layer, so that organic matters, ammonia nitrogen, heavy metals and other pollutants in the water can be removed by the zeolite or the volcanic rock.

Preferably, the gaps between adjacent ceramic grains in the ceramic grain layer are filled with zeolite or volcanic rock. The zeolite or the volcanic rock is matched with the ceramsite, so that the water purification effect of the ceramsite layer is better.

Preferably, the water-permeable cloth is water-permeable geotextile, and the thickness of the water-permeable cloth is between 1mm and 2 mm.

Preferably, the surface of the pine stump is covered with a carbonized layer. The carbonized pine stump is not easy to corrode, the stability of the river channel is good, and the service life of the pine stump is greatly prolonged.

Preferably, the water collecting pipe is a PE pipe, the pipe diameter of the water collecting pipe is 50mm, water collecting holes for collecting filtered water are formed in the water collecting pipe, and the arrangement gradient of the water collecting pipe is 3 per mill.

Preferably, the water reservoir is surrounded by pine piles, and the depth of the water reservoir is 2-3 m.

Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:

this ecological interception system adopts multistage interception to filter the farmland water, and the farmland water can also be by recycle after being filtered, improves the utilization ratio of water resource. Meanwhile, the river channel is formed simply, people only need to insert the treated pine piles into the river bank ramp side by side, the river channel does not need to be dug by a traditional intercepting system, and then concrete is paved. Farmland water flowing into water along the river bank can be decomposed and purified by the aquatic plants, and the aggregate layer is used for assisting the aquatic plants in purifying the farmland water and can adsorb harmful elements, bacteria and mineralized water quality in the farmland water. The collector pipe can collect the farmland water after filtering and carry the cistern in, the cistern can be carried the filtrating water in it for the farmland through the water pump and carry out the secondary irrigation.

Drawings

FIG. 1 is a schematic structural diagram of the present invention in a first position.

Fig. 2 is a schematic structural view in a second position state of the present invention.

Fig. 3 is a schematic view of the side wall structure of the distribution canal of fig. 1.

Fig. 4 is a schematic view of the structure of the water reservoir of the present invention.

The names of the parts indicated by the numerical references in the above figures are as follows:

1-pine pile

2-river channel

3-water permeable cloth

4-backfill soil layer

5-aggregate layer, 51-gravel layer and 52-ceramsite layer

6-aquatic plant layer

7-Farmland ditch

8-water distribution channel, 81-water distribution hole

9-grid

10-water collecting pipe

11-reservoir

12-Water Pump

13-liquid level measuring instrument

Detailed Description

The invention will be described in further detail below with reference to the accompanying figures 1-4 and examples.

Example 1

The utility model provides an ecological interception system of agricultural non-point source pollution, is agricultural irrigation canals and ditches 7 one at least including quantity, and the farmland irrigation canals and ditches 7 that this embodiment shows are one, and farmland irrigation canals and ditches 7 is used for irrigating the farmland on the one hand, and on the other hand can carry out the farmland with the farmland water after irrigating, and when thunderstorm weather, the farmland flows into farmland irrigation canals and ditches 7 under the irrigation of rainwater, and farmland irrigation canals and ditches 7 avoid the farmland to be flooded with this farmland water discharge. The output end of the agricultural ditch 7 is provided with a water distribution ditch 8 communicated with the agricultural ditch, the water distribution ditch 8 is used for separating silt, and the silt can be deposited at the bottom of the water distribution ditch 8. A grid 9 for blocking sundries with larger volume is arranged at the joint of the agricultural ditch 7 and the water distribution ditch 8; the ecological intercepting system further comprises pine piles 1 inserted into the slope of the river bank, and a plurality of pine piles 1 are connected together side by side to form a pine wall. The pine piles 1 and the river bank ramp form a river channel 2, and the width s of an opening at the top of the river channel 2 is 1.5 m. The river channel 2 is laid with the cloth 3 that seeps water, and the cloth 3 that seeps water is filled up respectively down with backfill soil layer 4, aggregate layer 5, and the cloth 3 that seeps water is used for catching the great pollutant of diameter in the bank earth on the one hand, and its on the other hand is used for pinning backfill soil layer 4 and aggregate layer 5, prevents backfill soil layer 4 and aggregate layer 5 and runs off. The lower part of aggregate layer 5 is installed quantity and is a plurality of and be used for collecting the water-collecting pipe 10 of crossing, and water-collecting pipe 10 tip intercommunication has the cistern 11 of placing at river channel irrigation canals and ditches 2 tip, and cistern 11 surrounds through many pine stake 1 and forms. Install level measurement appearance 13 in the cistern 11 and be used for carrying the water pump 12 in the farmland with the drainage, level measurement appearance 13 is installed on the lateral wall of cistern 11, water pump 12 carries the water in the cistern 11 to the farmland according to the signal of level measurement appearance 13 feedback, this ecological interception system still includes the PLC controller promptly, level measurement appearance 13 is connected with the PLC controller and is used for detecting the water level in the cistern 11, when the water level in the cistern 11 is higher than the setting value, level measurement appearance 13 sends the water level information in the cistern 11 for the PLC controller, the PLC controller control water pump 12 starts, water pump 12 pumps the water in the cistern 11 to carry out the secondary irrigation in the farmland. The backfill soil layer 4 is planted with the aquatic plant layer 6, the plants planted in the aquatic plant layer 6 are iris, and in other embodiments, the aquatic plant layer 6 is canna. The water distribution channel 8 is arranged on the backfill soil layer 4, the bottom of the water distribution channel 8 extends into the backfill soil layer 4, the top end of the water distribution channel 8 extends out of the backfill soil layer 4, a plurality of water distribution holes 81 are arranged on the side wall of the water distribution channel 8 facing the aquatic plant layer 6, and the number of the water distribution holes 81 shown in the figure is six. This ecological interception system adopts multistage interception to filter the farmland water, and the farmland water can also be by recycle after being filtered, improves the utilization ratio of water resource. Meanwhile, the riverway ditch 2 is simple in forming, people only need to insert the treated pine piles 1 into the riverbank ramp side by side, the riverway ditch does not need to be dug by a traditional intercepting system, and then concrete is paved. Farmland water flowing into water along the river bank can be decomposed and purified by the aquatic plants, and the aggregate layer 5 is used for assisting the aquatic plants in purifying the farmland water and can adsorb harmful elements, bacteria and mineralized water quality in the farmland water. The water collecting pipe 10 can collect the filtered farmland water and convey the farmland water to the water reservoir 11, and the water reservoir 11 can convey the filtered water in the water reservoir to the farmland through the water pump 12 for secondary irrigation.

The width w of the water distribution channel 8 is 20cm, the axes of all the water distribution holes 81 are on the same horizontal plane, and the interval between the adjacent water distribution holes 81 is 2 m. The water distribution channel 8 with the moderate width is convenient for people to clean deposited silt in the channel, and the water distribution holes 81 are used for conveying the deposited farmland water to the aquatic plant layer 6.

The aggregate layer 5 comprises a crushed stone layer 51 and a ceramsite layer 52, and the crushed stone layer 51 is arranged above the ceramsite layer 52. The gravel in the gravel layer 51 can prolong the water flow path of the farmland water, so that the purification time of the ecological interception system on the farmland water is prolonged, the ceramsite in the ceramsite layer 52 can adsorb harmful elements, bacteria and mineralized water in the farmland water, and the gravel and the ceramsite are matched for use to improve the purification effect of the farmland water.

The diameter of the crushed stone in the crushed stone layer 51 is between 1mm and 10mm, the diameter of the ceramsite in the ceramsite layer 52 is between 3mm and 5mm, and in the diameter range, the crushed stone has better water-fixing effect, the quantity of the ceramsite is large, the gap between the adjacent ceramsite is small, and the purification effect of the ceramsite layer is better.

The gaps between adjacent crushed stones in the crushed stone layer 51 are filled with zeolite. The crushed stone layer 51 fixes water therein, so that the zeolite can remove pollutants such as organic matters, ammonia nitrogen, heavy metals and the like in the water.

The gaps between adjacent ceramic grains in the ceramic grain layer 52 are filled with zeolite. The zeolite is matched with the ceramsite, so that the water purifying effect of the ceramsite layer 52 is better.

The water seepage cloth 3 is water seepage geotextile, and the thickness of the water seepage cloth 3 is 1 mm.

The surface of the pine pile 1 is covered with a carbonized layer, the carbonized pine pile 1 is not easy to corrode, the stability of the river channel 2 is good, and the service life of the pine pile 1 is greatly prolonged.

The water collecting pipe 10 is a PE pipe, the pipe diameter of the water collecting pipe 10 is 50mm, water collecting holes used for collecting filtered water are formed in the water collecting pipe 10, and the arrangement gradient of the water collecting pipe 10 is 3 per thousand.

The water reservoir 11 is formed by surrounding pine piles, and the depth of the water reservoir 11 is 2 m.

Example 2

Example 2 has substantially the same characteristics as example 1, except that the width s of the top opening of the channel 2 is 1.75 m. The width w of the distribution channel 8 is 25 cm. The water seepage cloth 3 is water seepage geotextile, and the thickness of the water seepage cloth 3 is 1.5 mm. The depth of the reservoir 11 is 1.5 m.

Example 3

Example 3 has substantially the same characteristics as example 1, except that the width s of the top opening of the channel 2 is 2 m. The width w of the distribution channel 8 is 30 cm. The water seepage cloth 3 is water seepage geotextile, and the thickness of the water seepage cloth 3 is 2 mm. The depth of the reservoir 11 was 3 m.

Example 4

Example 4 has substantially the same characteristics as example 1 except that the gaps between adjacent crushed stones in the crushed stone layer 51 are filled with volcanic rocks. Volcanic rock is filled between gaps of adjacent ceramic grains in the ceramic grain layer 52.

Example 5

Example 5 has substantially the same characteristics as example 1 except that the gaps between adjacent crushed stones in the crushed stone layer 51 are filled with zeolite. Volcanic rock is filled between gaps of adjacent ceramic grains in the ceramic grain layer 52.

Example 6

Example 6 has substantially the same characteristics as example 1 except that the gaps between adjacent crushed stones in the crushed stone layer 51 are filled with volcanic rocks. The gaps between adjacent ceramic grains in the ceramic grain layer 52 are filled with zeolite.