CN110615537A - Three-dimensional resistance control ecological purification system for agricultural non-point source pollution wastewater and construction method - Google Patents
Three-dimensional resistance control ecological purification system for agricultural non-point source pollution wastewater and construction method Download PDFInfo
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Abstract
The invention discloses a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, which comprises a resistance control pond, an auxiliary pond, a circulating water pump, an aeration pump and a controller, wherein the resistance control pond is communicated with a farmland drainage ditch, and the three-dimensional resistance control ecological purification system is characterized in that: the resistance control pond is communicated with the auxiliary pond through the water outlet pipe, the water inlet of the circulating water pump is connected with a water inlet pipe extending into the bottom of the auxiliary pond, a first liquid level meter and a second liquid level meter are respectively arranged in the resistance control pond and the auxiliary pond, and signal output ends of the first liquid level meter and the second liquid level meter are connected with an input end of the controller. According to the ecological purification system, the suspended box body, the open section and the aquatic plants, animals and microorganisms planted in the auxiliary pond can realize the effects of purifying, filtering and sterilizing water quality, can realize the consumption of nitrogen and phosphorus organic matters in agricultural non-point source polluted wastewater, can thoroughly remove chemical fertilizers and residual organic matters of pesticides, and solves the problem of overhigh organic matter content in farmland return water.
Description
Technical Field
The invention relates to an ecological purification system and a construction method thereof, in particular to an agricultural non-point source polluted wastewater three-dimensional resistance ecological purification system and a construction method thereof.
Background
In order to pursue crop yield to the maximum extent, people apply a large amount of chemical fertilizers and spray a large amount of pesticides to farmlands, and the large amount of chemical fertilizers and pesticides can cause the content of non-decomposable nitrogen and phosphorus organic matters in farmland soil to be too high, so that non-point source pollution of the farmlands is caused. Particularly, in the initial stage of precipitation, surface runoff of a farmland contains nitrogen and phosphorus organic matters with higher concentration, if surface runoff in the initial stage of precipitation is not treated, the surface runoff is discharged into a ditch or a pond to cause eutrophication of a water body, the eutrophicated water body causes overhigh COD consumption, and overhigh oxygen consumption in the water body causes massive death of aquatic organisms, thereby aggravating the pollution of the water body. In order to reduce the influence of agricultural non-point source pollution on water, farmland drainage at the early stage of rainfall needs to be purified, and the farmland non-point source pollution wastewater can be purified by using the consumption of nitrogen and phosphorus organic matters in the water by aquatic plants, aquatic animals and aquatic microorganisms.
Disclosure of Invention
The invention provides a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater and a construction method thereof in order to overcome the defects of the technical problems.
The invention relates to a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, which comprises a resistance control pond, an auxiliary pond, a circulating water pump, an aeration pump and a controller, wherein the resistance control pond is communicated with a farmland drainage ditch, and the agricultural non-point source polluted wastewater flows into the resistance control pond through the farmland drainage ditch; the aeration pump is arranged on the resistance control pond, and an air outlet of the aeration pump is connected with an aeration pipe extending into the bottom of the resistance control pond; the height of the auxiliary pond is lower than that of the resistance control pond; the method is characterized in that: the resistance control pond is communicated with the auxiliary pond through a water outlet pipe, the water inlet end of the water outlet pipe is communicated with the bottom of the resistance control pond, and the water outlet of the water outlet pipe is positioned above the auxiliary pond; a water inlet pipe extending into the bottom of the auxiliary pond is connected to a water inlet of the circulating water pump, and a water return pipe for returning the outlet water to the resistance control pond is connected to a water outlet of the circulating water pump; the horizontal part of the water outlet pipe is an open section with the upper part removed, solid particles for fixing a root system are placed at the bottom of the open section, and aquatic weeds or vegetables are planted in the open section; the resistance control pond and the auxiliary pond are respectively provided with a first liquid level meter and a second liquid level meter, the signal output ends of the first liquid level meter and the second liquid level meter are connected with the input end of the controller, and different output ends of the controller are connected with the control ends of the aeration pump and the circulating water pump.
The invention relates to a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, wherein a vertical flow purification device is arranged above a resistance control pond and consists of a suspended box body, filter cotton, a ceramsite layer, a lower partition plate and an upper partition plate, the upper end of the suspended box body is provided with an opening, the lower part of the suspended box body is a box bottom plate, the lower partition plate and the upper partition plate are respectively arranged at the middle lower part and the upper part of an inner cavity of the suspended box body, the filter cotton is positioned between the box bottom plate and the lower partition plate, and the ceramsite layer is positioned between the lower partition plate and the upper partition plate; cultivation holes are uniformly formed in the upper partition plate, water permeable baskets are placed in the cultivation holes, and aquatic weeds or vegetables are planted in the water permeable baskets;
the lower partition plate is provided with a water permeable hole for facilitating the water in the ceramsite layer to flow into the filter cotton, the water outlet of the water return pipe is positioned at one end of the upper partition plate, and the end, far away from the outlet of the water return pipe, of the box bottom plate is provided with a water outlet hole.
According to the three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater, the density and the pore size of the water permeable holes formed in the lower partition plate are gradually increased from one end of the water outlet of the water return pipe to the other end of the water outlet of the water return pipe.
According to the three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, the water permeable basket is filled with gravels for fixing plant roots, and the outer side plates are fixed on the two side walls of the resistance control pond.
According to the three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, the water outlet pipe is provided with the valve for adjusting the flow velocity of the outlet water.
The invention discloses a construction method of a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, which is characterized by comprising the following steps of:
a) arranging a resistance control pond and an auxiliary pond, arranging the resistance control pond and the auxiliary pond, digging the resistance control pond and the auxiliary pond at proper positions, communicating a farmland drainage channel with the resistance control pond so that agricultural non-point source polluted wastewater can flow into the resistance control pond through the farmland drainage channel, ensuring that the height of the auxiliary pond is lower than that of the resistance control pond, and then arranging aquatic plants in the resistance control pond and the auxiliary pond and culturing fishes; b) arranging a water outlet pipe, arranging the water outlet pipe between the resistance control pond and the auxiliary pond, communicating the water inlet end of the water outlet pipe with the bottom of the resistance control pond, and positioning the water outlet of the water outlet pipe above the auxiliary pond; then removing the upper part of the horizontal section of the water outlet pipe to form an open section with an opening at the upper part, filling solid particles in the open section and planting water plants or vegetables; finally, a valve for controlling the flow rate is arranged on the water outlet pipe; c) arranging a vertical flow purification device, placing a suspended box body above the resistance control pond, sequentially placing filter cotton, a lower partition plate, ceramsite and an upper partition plate in an inner cavity of the suspended box body from bottom to top, then placing a permeable basket in a cultivation hole of the upper partition plate, and finally planting waterweeds or vegetables in the permeable basket by using broken stones; d) arranging a circulating water pump, arranging the circulating water pump close to the auxiliary pond, connecting a water inlet pipe to a water inlet of the circulating water pump, and ensuring that the water inlet pipe extends into the bottom of the auxiliary pond; a water outlet of the circulating water pump is connected with a water return pipe, and the water outlet of the water return pipe is positioned above one end, far away from the water outlet hole, of the upper partition plate; e) setting an aeration device, placing an aeration pump on the resistance control pond, and connecting an aeration pipe extending into the bottom of the resistance control pond on an air outlet of the aeration pump; f) setting a controller and a liquid level meter, placing a first liquid level meter for measuring the liquid level height in the resistance control pond, placing a second liquid level meter for measuring the liquid level height in the auxiliary pond in a second resistance control pond, connecting the output ends of the first liquid level meter and the second liquid level meter with different input ends of the controller respectively, and finally connecting different output ends of the controller with the control ends of an aeration pump and a circulating water pump; f) the operation of the three-dimensional resistance control ecological purification system for the agricultural non-point source polluted wastewater starts a controller, an aeration pump and a power supply of a circulating water pump, water in the resistance control pond flows to the auxiliary pond through a water outlet pipe under the action of gravity, and is filtered and purified at the open section; the water flows into the auxiliary pond and is sterilized and disinfected by ultraviolet rays under the irradiation of sunlight; under the action of a circulating water pump, pumping water in the auxiliary pond into the vertical flow purification device; the water flowing out of the water return pipe sequentially passes through a permeable basket for cultivating aquatic plants or vegetables, a ceramsite layer and filter cotton from top to bottom for filtration and purification treatment, and then flows into the resistance control pond; when the controller detects that the liquid level in the resistance control pond is too high and the liquid level in the auxiliary pond is normal through the liquid level meter, stopping pumping water by the circulating water pump or reducing the water pumping quantity of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too high and the liquid level in the resistance control pond is normal, increasing the water pumping quantity of the circulating water pump; when the liquid level in the resistance control pond is detected to be too low and the liquid level in the auxiliary pond is normal, increasing the water pumping amount of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too low and the liquid level in the resistance control pond is normal, stopping the water pumping of the circulating water pump or reducing the water pumping amount of the circulating water pump; when the liquid levels in the control pond and the auxiliary pond are detected to be overhigh, an alarm signal of excessive total water is sent out to remind personnel of draining water; when the liquid levels in the resistance control pond and the auxiliary pond are detected to be too low, an alarm signal that the total water amount is too small is sent out to remind personnel to add water.
The invention has the beneficial effects that: according to the three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater, the agricultural non-point source polluted wastewater flows into a resistance control pond through a farmland drainage ditch, the resistance control pond is communicated with an auxiliary pond through a water outlet pipe, and water in the auxiliary pond is pumped into the resistance control pond through a circulating water pump; in the working process, water in the resistance control pond flows into the auxiliary pond through the water outlet pipe under the action of self gravity, and is primarily filtered and purified through solid particles (such as ceramsite, pebble or colored stone) aquatic plants or vegetables at the open section on the water outlet pipe, and is further filtered and purified in the auxiliary pond, so that the aquatic plants, animals and microorganisms planted in the suspended box body, the open section and the auxiliary pond can realize the purification, filtration and sterilization effects on water quality, the consumption of nitrogen and phosphorus organic matters in agricultural non-point source polluted wastewater can be realized, chemical fertilizers and residual organic matters of pesticides can be thoroughly removed, and the problem of overhigh organic matter content in farmland return water is solved.
Furthermore, through the vertical flow purification device which is arranged above the resistance control pond and is formed by the suspended box body, the filter cotton, the lower partition plate, the ceramsite layer and the upper partition plate, water pumped out by the circulating water pump is sequentially subjected to filtration treatment of the permeable basket, the ceramsite layer and the filter cotton which are cultivated with aquatic plants or vegetables, microorganisms growing on the ceramsite layer and the filter cotton can further consume organic matters and ammonia nitrogen in the water, and the thorough purification effect of agricultural non-point source polluted wastewater is realized.
Drawings
FIG. 1 is a schematic structural diagram of a three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater;
fig. 2 is a top plan view of a resistance control pond of the present invention;
FIG. 3 is a schematic view of the vertical flow purification apparatus of the present invention;
FIG. 4 is a front view of the suspended cassette of the present invention;
FIG. 5 is a top view of the suspended cassette of the present invention;
FIG. 6 is a schematic structural view of an upper separator plate according to the present invention;
fig. 7 is a schematic structural view of a lower separator according to the present invention.
In the figure: 1 resistance control pond, 2 unsettled box bodies, 3 box bottom plates, 4 lower baffles, 5 last baffles, 6 filter pulp, 7 pottery grain layer, 8 hole of permeating water, 9 apopores, 10 cultivation hole, 11 basket that permeates water, 12 pasture and water or vegetables, 13 rubbles, 14 lower supporting shoes, support block on 15, 16 outer panel, 17 aeration pump, 18 aeration pipe, 19 auxiliary ponds, 20 circulating water pump, 21 outlet pipe, 22 inlet tubes, 23 wet return, 24 first level gauge, 25 second level gauge, 26 valves, 27 open sections, 28 solid particles, 29 controller, 30 breach, 31 benthophyte, 32 fishes, 33 agricultural area source pollution waste water.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in fig. 1, a schematic structural diagram of a three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater of the present invention is provided, which comprises a resistance control pond 1, an auxiliary pond 19, an aeration pump 17, a water outlet pipe 21, a circulating water pump 20, a water return pipe 23 and a controller 29, wherein the resistance control pond 1 and the auxiliary pond 19 are dug at corresponding positions, the resistance control pond 1 is communicated with a farmland drainage channel, so that the agricultural non-point source polluted wastewater flows into the resistance control pond through the farmland drainage channel, and the resistance control pond 1 is communicated with the auxiliary pond 19 through the water outlet pipe 21; as shown in fig. 2, which shows a top view of the resistance control pond of the present invention, the inlet of the outlet pipe 21 is connected to the bottom of the auxiliary pond 19, and the outlet end of the outlet pipe 21 is located above the auxiliary pond 19, so that the water in the resistance control pond 1 can flow into the auxiliary pond 19 through the outlet pipe 21 under the action of its own weight. The water outlet pipe 21 is provided with a valve 26, and the water flow speed in the water outlet pipe 21 can be adjusted by controlling the opening degree of the valve 26, so that the water flow speed from the resistance control pond 1 to the auxiliary pond 19 is moderate, and the water flow speed is not too fast or too slow.
In order to increase the purification of the water flowing out of the resistance control pond 1, the upper part of the horizontal section of the water outlet pipe 21 is removed, an open section 27 with an upper end opened is formed, solid particles 28 with the function of fixing root systems are placed in the open section 27, the solid particles 28 can be ceramsite, pebble or colored stone, and aquatic plants or vegetables 12 are planted in the open section 27, so that the solid particles 28, the aquatic plants or the vegetables 12 can filter and purify the water in the process that the water flows through the open section 27. Aquatic plants and raised fishes are planted in the control pond 1 and the auxiliary pond 19, and emergent and floating plants such as pampas grass, water lily, canna and the like can also be planted in the auxiliary pond 19.
The circulating water pump 20 is arranged above the auxiliary pond 19, a water inlet pipe 22 is connected to a water inlet of the circulating water pump 20, the water inlet pipe 22 extends into the auxiliary pond 19, and a water return pipe 23 is connected to a water outlet of the circulating water pump 10, so that water in the auxiliary pond 19 can be pumped into the resistance control pond 1 under the action of the circulating water pump 20, and circulating flow of water in the resistance control pond 1 and the auxiliary pond 19 is achieved. The resistance control pond 1 and the auxiliary pond 19 are respectively provided with a first liquid level meter 24 and a second liquid level meter 25 for measuring the liquid level height in the resistance control pond 1, the resistance control pond 1 is further provided with an aeration pump 17, and an air outlet of the aeration pump 17 is connected with an aeration pipe 18 extending into the bottom of the resistance control pond 1, so that the resistance control pond 1 is aerated and oxygenated under the action of the aeration pump 17, and survival of animals such as fish in the resistance control pond 1 is maintained.
The outputs of the first liquid level meter 24 and the second liquid level meter 25 are respectively connected with different input ends of the controller 29 so as to realize the measurement of the liquid levels in the resistance control pond 1 and the auxiliary pond 19; different outputs of the controller 29 are connected to the aeration pump 17 and the circulating water pump 20 to control the operating states of the aeration pump 17 and the circulating water pump 20. Under the control of the controller 29, the water can circularly flow in the resistance control pond 1 and the auxiliary pond 19, and the water can be filtered, purified and absorbed by plants and microorganisms in the process of flowing through the open section 27 and the auxiliary pond 19, so that the purification treatment of the agricultural non-point source polluted wastewater is realized.
In order to realize the thorough purification treatment of water quality, the upper part of the resistance control pond 1 is provided with a vertical flow purification device, as shown in figure 3, the structural schematic diagram of the vertical flow purification device is provided, the vertical flow purification device consists of a suspended box body 2, filter cotton 6, a lower baffle plate 4, a ceramsite layer 7 and an upper baffle plate 5,
the suspended box body 2 is arranged on the upper portion of the resistance control pond 1, the upper end of the suspended box body 2 is open, a cavity is formed inside the suspended box body 2, the bottom of the suspended box body 2 is a box bottom plate 3, a lower partition plate 4 is arranged on the middle lower portion of the cavity inside the suspended box body 2, a lower partition plate 4 is arranged on the upper portion of the cavity, filter cotton 6 is filled between the box bottom plate 3 and the lower partition plate 4, and a ceramsite layer 7 is filled between the lower partition plate 4 and an upper partition plate 5. Last baffle 5 is last evenly to have seted up cultivation hole 10, has all inserted the basket 11 that permeates water in every cultivation hole 10, has planted pasture and water or vegetables 12 in every basket 11 that permeates water, for guaranteeing pasture and water or vegetables 12 stable growth in the basket 11 that permeates water, it has the rubble 13 of stabilizing plant roots to fill in the basket 11 that permeates water. A plurality of water permeable holes 8 are formed in the lower partition plate 4 along the length direction of the lower partition plate, so that water above the lower partition plate 4 vertically falls into the filter cotton 6 below.
The water outlet hole 9 is arranged at the left end of the box bottom plate 3, so that the water outlet end is far away from the water inlet end, thereby ensuring that the waterweeds or vegetables 12, the ceramsite layer 7 and the filter cotton 6 are fully contacted with the water body to be purified to the maximum extent, and ensuring the purification effect. After the water flowing out of the water return pipe 23 flows onto the upper partition plate 5, the water flows down through each water permeable basket 11, in the process of flowing through the water permeable baskets 11, the crushed stones 13 and the cultivated water plants or vegetables 12 realize the filtration and purification of the water, and then flow into the ceramsite layer 7 below, the further purification of the water is realized by the ceramsite layer 7, and meanwhile, microorganisms bred in the ceramsite layer 7 consume organic matters and ammonia nitrogen in the water, so that the water quality purification is realized. The water in the ceramsite layer 7 vertically flows into the filter cotton 6 through the water permeable holes 8 formed in the lower partition plate 4, and the microorganisms in the filter cotton 6 realize the further purification treatment of the water quality. After the purification treatment of the vertical flow purification wetland consisting of the waterweeds or vegetables 12, the ceramsite layer 7 and the filter cotton 6, the water finally flows out through the water outlet holes 9 on the box bottom plate 3.
The water falling into the resistance control pond 1 from the water outlet hole 9 on the box bottom plate 3 is fully contacted with the air, the oxygen content is higher, the water in the resistance control pond 1 can be maintained to have higher oxygen content, and the survival of animals such as fish and the like in the resistance control pond is ensured. The vertical flow purification wetland formed by the waterweeds or vegetables 12, the ceramsite layer 7 and the filter cotton 6 has good filtration and water quality purification effects, so that the vertical flow purification wetland has high external influence resistance, and even if too much feed is put in for a long time, water eutrophication caused by the too much feed can be treated, and the animals in the control pond 1 can be ensured to survive for a long time.
Therefore, the water pumped by the circulating water pump 20 vertically flows from top to bottom, the water distribution is uniform, and the water grass or the vegetables 12, the ceramsite layer 7 and the filter cotton 6 can fully play the roles of filtration and purification. As shown in fig. 4 and fig. 5, which respectively show a front view and a top view of the suspended box body of the present invention, a lower support block 14 is disposed on an inner wall of a lower portion of the suspended box body 2, an upper support block 15 is disposed on an inner wall of an upper portion of the suspended box body, and the upper support block 15 and the lower support block 14 are not in the same vertical direction; the lower support block 14 supports the lower partition 4 and the upper support block 15 supports the upper partition 5. As shown in fig. 6, a schematic structural diagram of the upper partition plate 5 of the present invention is shown, wherein a plurality of cultivation holes 10 are uniformly formed on the upper partition plate 5 along the length direction thereof, and the cultivation holes 10 are used for placing the permeable baskets 11.
As shown in fig. 7, a schematic structural diagram of the lower partition plate 4 of the present invention is shown, the lower partition plate 4 is provided with water permeable holes 8 along the length direction thereof, the aperture and density of the water permeable holes 8 are gradually increased from right to left, so that uniform water distribution is achieved in the process that water falls through the water permeable holes 8. Because the right end of the lower baffle 5 is close to the water outlet of the return pipe 23, the water pressure is relatively large, and therefore, the water permeable holes 8 with low density and small aperture are arranged; the left end of the lower baffle 5 is far away from the water outlet, and a permeable hole 8 with large density and large aperture is arranged to ensure that the water uniformly falls into the filter cotton 6 after passing through the permeable hole 8. The edge of the lower partition plate 4 is also provided with a notch 30 for passing through the upper supporting block 15, so that the lower partition plate 4 passes through the position of the upper supporting block 15 and falls on the supporting block 14.
The construction method of the three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater is realized by the following steps:
a) arranging a resistance control pond and an auxiliary pond, arranging the resistance control pond and the auxiliary pond, digging the resistance control pond and the auxiliary pond at proper positions, communicating a farmland drainage channel with the resistance control pond so that agricultural non-point source polluted wastewater can flow into the resistance control pond through the farmland drainage channel, ensuring that the height of the auxiliary pond is lower than that of the resistance control pond, and then arranging aquatic plants in the resistance control pond and the auxiliary pond and culturing fishes;
b) arranging a water outlet pipe, arranging a water outlet pipe (21) between the resistance control pond and the auxiliary pond, communicating the water inlet end of the water outlet pipe with the bottom of the resistance control pond, and positioning the water outlet of the water outlet pipe above the auxiliary pond (19); then the upper part of the horizontal section of the water outlet pipe is removed to form an open section (27) with an open upper part, and the open section is filled with solid particles (28) and planted with waterweeds or vegetables (12); finally, a valve (26) for controlling the flow rate is arranged on the water outlet pipe;
c) arranging a vertical flow purification device, placing a suspended box body (2) above a resistance control pond (1), sequentially placing filter cotton (6), a lower partition plate (5), ceramsite and an upper partition plate (5) in an inner cavity of the suspended box body from bottom to top, then placing a water permeable basket (11) in a cultivation hole (10) of the upper partition plate, and finally planting waterweeds or vegetables (12) in the water permeable basket by utilizing broken stones (13);
d) arranging a circulating water pump, arranging the circulating water pump (20) close to the auxiliary pond, connecting a water inlet pipe (22) to a water inlet of the circulating water pump, and ensuring that the water inlet pipe extends into the bottom of the auxiliary pond; a water return pipe (23) is connected to the water outlet of the circulating water pump, and the water outlet of the water return pipe is positioned above one end, far away from the water outlet hole (9), of the upper partition plate (5);
e) an aeration device is arranged, an aeration pump (17) is arranged on the resistance control pond (1), and an aeration pipe (18) extending into the bottom of the resistance control pond is connected to an air outlet of the aeration pump;
f) arranging a controller and a liquid level meter, placing a first liquid level meter (24) for measuring the liquid level height in the resistance control pond, placing a second liquid level meter (25) for measuring the liquid level height in the auxiliary pond in the second resistance control pond, then respectively connecting the output ends of the first liquid level meter and the second liquid level meter with different input ends of the controller, and finally connecting different output ends of the controller with the control ends of an aeration pump (17) and a circulating water pump (20);
f) the operation of the three-dimensional resistance control ecological purification system for the agricultural non-point source polluted wastewater starts a controller, an aeration pump (17) and a power supply of a circulating water pump (20), water in the resistance control pond flows to the auxiliary pond through a water outlet pipe under the action of gravity, and is filtered and purified at an open section; the water flows into the auxiliary pond and is sterilized and disinfected by ultraviolet rays under the irradiation of sunlight; under the action of a circulating water pump, pumping water in the auxiliary pond into the vertical flow purification device; the water flowing out of the water return pipe (23) sequentially passes through a permeable basket for cultivating aquatic plants or vegetables, a ceramsite layer (7) and filter cotton from top to bottom for filtration and purification treatment, and then flows into the resistance control pond;
when the controller detects that the liquid level in the resistance control pond is too high and the liquid level in the auxiliary pond is normal through the liquid level meter, stopping pumping water by the circulating water pump or reducing the water pumping quantity of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too high and the liquid level in the resistance control pond is normal, increasing the water pumping quantity of the circulating water pump;
when the liquid level in the resistance control pond is detected to be too low and the liquid level in the auxiliary pond is normal, increasing the water pumping amount of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too low and the liquid level in the resistance control pond is normal, stopping the water pumping of the circulating water pump or reducing the water pumping amount of the circulating water pump;
when the liquid levels in the control pond and the auxiliary pond are detected to be overhigh, an alarm signal of excessive total water is sent out to remind personnel of draining water; when the liquid levels in the resistance control pond and the auxiliary pond are detected to be too low, an alarm signal that the total water amount is too small is sent out to remind personnel to add water.
Claims (6)
1. A three-dimensional resistance control ecological purification system for agricultural non-point source polluted wastewater comprises a resistance control pond (1), an auxiliary pond (19), a circulating water pump (20), an aeration pump (17) and a controller (29), wherein the resistance control pond is communicated with a farmland drainage channel, and the agricultural non-point source polluted wastewater flows into the resistance control pond through the farmland drainage channel; the aeration pump is arranged on the resistance control pond, and an air outlet of the aeration pump is connected with an aeration pipe (18) extending into the bottom of the resistance control pond; the height of the auxiliary pond is lower than that of the resistance control pond; the method is characterized in that: the resistance control pond is communicated with the auxiliary pond through a water outlet pipe (21), the water inlet end of the water outlet pipe is communicated with the bottom of the resistance control pond, and the water outlet of the water outlet pipe is positioned above the auxiliary pond; a water inlet pipe (22) extending into the bottom of the auxiliary pond is connected to a water inlet of the circulating water pump, and a water return pipe (23) for returning the outlet water to the resistance control pond is connected to a water outlet of the circulating water pump; the horizontal part of the water outlet pipe (21) is an open section (27) with the upper part removed, solid particles (28) with fixed root systems are placed at the bottom of the open section, and aquatic plants or vegetables (12) are planted in the open section; the resistance control pond and the auxiliary pond are respectively provided with a first liquid level meter (24) and a second liquid level meter (25), the signal output ends of the first liquid level meter and the second liquid level meter are connected with the input end of a controller, and different output ends of the controller are connected with the control ends of an aeration pump (17) and a circulating water pump (20).
2. The agricultural non-point source polluted wastewater three-dimensional prevention and control ecological purification system as claimed in claim 1, which is characterized in that: a vertical flow purification device is arranged above the resistance control pond (1), the vertical flow purification device is composed of a suspended box body (2), filter cotton (6), a ceramsite layer (7), a lower partition plate (4) and an upper partition plate (5), the upper end of the suspended box body is open, the lower part of the suspended box body is a box bottom plate (3), the lower partition plate and the upper partition plate are respectively arranged at the middle lower part and the upper part of an inner cavity of the suspended box body, the filter cotton is positioned between the box bottom plate and the lower partition plate, and the ceramsite layer is positioned between the lower partition plate and the upper partition plate; the upper partition board is uniformly provided with cultivation holes (10), water permeable baskets (11) are placed in the cultivation holes, and aquatic plants or vegetables (12) are planted in the water permeable baskets;
set up on the lower baffle and be convenient for the moisture in the haydite layer to flow into the hole (8) of permeating water in the filter pulp, the delivery port of wet return (23) is located the one end of last baffle (5), and apopore (9) have been seted up to the one end of keeping away from the wet return export on box bottom plate (3).
3. The three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater as claimed in claim 1 or 2, which is characterized in that: the density and the aperture of the permeable holes (8) formed in the lower partition plate (4) are gradually increased from one end of the water outlet of the water return pipe (23) to the other end of the water outlet.
4. The three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater as claimed in claim 1 or 2, which is characterized in that: fill in the basket (11) that permeates water and have rubble (13) that are used for fixed plant roots, all be fixed with outer panel (16) on the both sides wall of hindering accuse pond (1).
5. The three-dimensional prevention and control ecological purification system for agricultural non-point source polluted wastewater as claimed in claim 1 or 2, which is characterized in that: and a valve (26) for adjusting the flow speed of the outlet water is arranged on the outlet pipe (21).
6. The construction method of the three-dimensional ecological purification system for agricultural non-point source polluted wastewater based on claim 2 is realized by the following steps:
a) arranging a resistance control pond and an auxiliary pond, digging the resistance control pond and the auxiliary pond at proper positions, and communicating a farmland drainage channel with the resistance control pond so that agricultural non-point source polluted wastewater can flow into the resistance control pond through the farmland drainage channel, ensuring that the height of the auxiliary pond is lower than that of the resistance control pond, and then arranging aquatic plants in the resistance control pond and the auxiliary pond and culturing fishes;
b) arranging a water outlet pipe, arranging a water outlet pipe (21) between the resistance control pond and the auxiliary pond, communicating the water inlet end of the water outlet pipe with the bottom of the resistance control pond, and positioning the water outlet of the water outlet pipe above the auxiliary pond (19); then the upper part of the horizontal section of the water outlet pipe is removed to form an open section (27) with an open upper part, and the open section is filled with solid particles (28) and planted with waterweeds or vegetables (12); finally, a valve (26) for controlling the flow rate is arranged on the water outlet pipe;
c) arranging a vertical flow purification device, placing a suspended box body (2) above a resistance control pond (1), sequentially placing filter cotton (6), a lower partition plate (5), ceramsite and an upper partition plate (5) in an inner cavity of the suspended box body from bottom to top, then placing a water permeable basket (11) in a cultivation hole (10) of the upper partition plate, and finally planting waterweeds or vegetables (12) in the water permeable basket by utilizing broken stones (13);
d) arranging a circulating water pump, arranging the circulating water pump (20) close to the auxiliary pond, connecting a water inlet pipe (22) to a water inlet of the circulating water pump, and ensuring that the water inlet pipe extends into the bottom of the auxiliary pond; a water return pipe (23) is connected to the water outlet of the circulating water pump, and the water outlet of the water return pipe is positioned above one end, far away from the water outlet hole (9), of the upper partition plate (5);
e) an aeration device is arranged, an aeration pump (17) is arranged on the resistance control pond (1), and an aeration pipe (18) extending into the bottom of the resistance control pond is connected to an air outlet of the aeration pump;
f) arranging a controller and a liquid level meter, placing a first liquid level meter (24) for measuring the liquid level height in the resistance control pond, placing a second liquid level meter (25) for measuring the liquid level height in the auxiliary pond in the second resistance control pond, then respectively connecting the output ends of the first liquid level meter and the second liquid level meter with different input ends of the controller, and finally connecting different output ends of the controller with the control ends of an aeration pump (17) and a circulating water pump (20);
f) the operation of the water circulation ecological system of the household resistance control pond is started, the controller, the aeration pump (17) and the power supply of the circulating water pump (20) are started, water in the resistance control pond flows to the auxiliary pond through the water outlet pipe under the action of gravity, and filtering and purifying treatment are carried out at the open section; the water flows into the auxiliary pond and is sterilized and disinfected by ultraviolet rays under the irradiation of sunlight; under the action of a circulating water pump, pumping water in the auxiliary pond into the vertical flow purification device; the water flowing out of the water return pipe (23) sequentially passes through a permeable basket for cultivating aquatic plants or vegetables, a ceramsite layer (7) and filter cotton from top to bottom for filtration and purification treatment, and then flows into the resistance control pond;
when the controller detects that the liquid level in the resistance control pond is too high and the liquid level in the auxiliary pond is normal through the liquid level meter, stopping pumping water by the circulating water pump or reducing the water pumping quantity of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too high and the liquid level in the resistance control pond is normal, increasing the water pumping quantity of the circulating water pump;
when the liquid level in the resistance control pond is detected to be too low and the liquid level in the auxiliary pond is normal, increasing the water pumping amount of the circulating water pump, and when the liquid level in the liquid level auxiliary pond is detected to be too low and the liquid level in the resistance control pond is normal, stopping the water pumping of the circulating water pump or reducing the water pumping amount of the circulating water pump;
when the liquid levels in the control pond and the auxiliary pond are detected to be overhigh, an alarm signal of excessive total water is sent out to remind personnel of draining water; when the liquid levels in the resistance control pond and the auxiliary pond are detected to be too low, an alarm signal that the total water amount is too small is sent out to remind personnel to add water.
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