Rural domestic sewage treatment device and sewage treatment method

Abstract

The invention belongs to the technical field of constructed wetlands, and particularly relates to a rural domestic sewage treatment device and a sewage treatment method.The rural domestic sewage treatment device comprises an ecological treatment pond, a planting assembly and a harvesting assembly; the planting assembly comprises a planting plate; a group of embedded cylinders are uniformly distributed on the surface of the planting plate; the harvesting assembly comprises a harvesting plate; a group of connecting rings are uniformly distributed on the surface of the harvesting plate; the lower side of the connecting ring is fixedly connected with a limiting cage; the lower end of the limiting cage is fixedly connected with a base. Planting and harvesting of plants can be achieved through the movable harvesting plate and the limiting cage, the planting and harvesting efficiency of the plants is improved, the whole process is conducted on the bank of the ecological treatment pond, workers do not need to enter the pond body, the matrix structure cannot be damaged, and after the plants are inoculated into the pre-embedded barrel, the planting and harvesting efficiency is improved. By utilizing the combined action of the pre-embedded cylinder, the limiting cage and the connecting ring, plants in an unsurvived state can be limited, supported and centralized, the plants are prevented from collapsing, and the survival probability is increased.

Description

Technical Field

[0001] This invention belongs to the field of constructed wetland technology, specifically a rural domestic sewage treatment device and sewage treatment method. Background Technology

[0002] Rural sewage is mainly composed of domestic wastewater, containing organic matter, nitrogen and phosphorus, and a small amount of detergent. The volume is small and dispersed, making it difficult to build centralized pipe networks and large-scale sewage treatment plants. There is also a shortage of operation and maintenance funds and technical personnel. It is necessary to balance ecological benefits with low cost. Therefore, the most mainstream treatment method for rural sewage is currently constructed wetland systems. Constructed wetlands have advantages such as low infrastructure investment, low energy consumption, simple operation and maintenance, eco-friendliness, and economic value of plants, which are highly compatible with the actual conditions of rural areas.

[0003] Constructed wetland wastewater treatment systems primarily purify wastewater through the combined action of plants, microorganisms, and substrates. Planting harvestable plants not only allows for the absorption and fixation of pollutants (such as nitrogen and phosphorus) through their roots, but also enables the removal and resource utilization of pollutants through regular harvesting. For example, reeds can be used for papermaking or building materials, cattail fibers can be used for weaving, the tender stems of water chestnuts are edible, water celery can be used as a vegetable, and elephant grass can be used as feed or biofuel, etc.

[0004] Chinese patent application CN109761367B discloses a rural domestic sewage treatment device and sewage treatment method. The key technical points of the solution are: it includes a pool body, which is divided into a vertical flow constructed wetland pool and an AAO filter pool connected in sequence by a first partition wall; the AAO filter pool is divided into an anaerobic section, an anoxic section and an aerobic section in sequence along the horizontal direction; the anaerobic section and the anoxic section are separated by a second partition wall; a guide wall is provided between the anoxic section and the aerobic section; the bottom of the second partition wall is provided with a water passage hole that can be controlled to open and close; the bottom side wall of the vertical flow constructed wetland pool has a connecting hole that communicates with the anaerobic section; and the AAO filter pool has an outlet on its pool wall located in the aerobic section.

[0005] Currently, the above-mentioned and other existing technologies often have the following drawbacks: In the process of using constructed wetland systems to treat rural domestic sewage, when harvesting plants regularly, it is necessary to manually enter the pool to use sickles and other tools to harvest the plants. However, the soil substrate on the surface of the pool gradually softens under the long-term soaking of sewage, forming a relatively fine and soft silt. After entering the pool, it is not only difficult for people to move around and not convenient for harvesting operations, but the trampling process will also damage the substrate structure and reduce the subsequent treatment effect of the wetland system on sewage.

[0006] Therefore, the present invention provides a rural domestic sewage treatment device and sewage treatment method. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by the present invention to solve its technical problem is as follows: The rural domestic sewage treatment device of the present invention includes an ecological treatment pond, a planting component and a harvesting component; the planting component and the harvesting component are each provided in a set and correspond to each other, and the harvesting component is located above the planting component.

[0009] The planting component includes a planting board, and both ends of the planting board are fixedly connected to the inner wall of the ecological treatment pool; a set of pre-embedded cylinders are evenly distributed on the surface of the planting board;

[0010] The harvesting assembly includes a U-shaped harvesting plate, with both ends of the harvesting plate resting on the top of the ecological treatment pool; a set of connecting rings are evenly distributed on the surface of the harvesting plate at the corresponding positions of the pre-embedded cylinder; a limiting cage is fixedly connected to the lower side of the connecting rings; a base is fixedly connected to the lower end of the limiting cage, and the base is located inside the pre-embedded cylinder.

[0011] Preferably, a set of support rods is evenly distributed at both ends of the harvesting plate on the top of the ecological treatment pool, and the support rods pass through the ends of the harvesting plate and are slidably connected to them.

[0012] Preferably, a set of through grooves are evenly distributed on the surface of the embedded cylinder.

[0013] Preferably, a mounting ring is provided at the top edge of the base; a ring-shaped blade is fixedly connected to the upper edge of the mounting ring.

[0014] Preferably, a gas storage box is fixedly connected to the end of the harvesting plate; a compression plate is slidably and sealed inside the gas storage box; a spring is fixedly connected between the compression plate and the gas storage box; an operating block is provided above the gas storage box; the operating block and the compression plate are fixedly connected by a connecting rod.

[0015] The bottom of the gas storage box is connected to a gas delivery pipe; the gas delivery pipe passes sequentially around the surface of the harvesting plate, the limiting cage, and the inside of the base; a guide block is fixedly connected to the lower side of the mounting ring, and the guide block is slidably connected to the base; a second spring is fixedly connected between the mounting ring and the base; a hollow elastic element is fixedly connected between the guide block and the base; the elastic element is connected to the gas delivery pipe through a conduit.

[0016] Preferably, a pair of grooves are symmetrically formed on both sides of the top of the support rod; a triangular block is provided inside the groove, and the bottom of the triangular block is hinged to the groove; a spring is fixedly connected between the side of the triangular block and the groove.

[0017] Preferably, the top of the support rod is provided with a groove; a slider is slidably connected inside the groove; and a connecting rope is fixedly connected between the bottom of the slider and the triangular block.

[0018] Preferably, an installation groove is provided on the outer side of the ecological treatment pool; a toothed plate is slidably connected inside the installation groove; a gear is rotatably connected inside the installation groove, and the gear is driven and controlled by a motor; the gear meshes with the lower side of the toothed plate; the support rod is slidably connected to the ecological treatment pool; the bottom of the support rod extends into the installation groove and is rotatably connected to a roller; a set of protrusions are evenly distributed on the upper side of the toothed plate.

[0019] A method for treating rural domestic sewage, using the aforementioned rural domestic sewage treatment device, includes the following steps:

[0020] S1: Lay a pebble layer, a crushed stone layer and a soil layer inside the ecological treatment pond, install planting boards and pre-buried cylinders, and introduce sewage into the ecological treatment pond.

[0021] S2: Place the plants into the multiple connecting rings and the limiting cage of the harvesting plate in sequence, place the harvesting plate in the water body of the ecological treatment pond, and the limiting cage and the base enter the corresponding pre-buried cylinder. The plants can then grow and purify the water quality inside the pre-buried cylinder and the limiting cage.

[0022] S3: When the plants are ready to be harvested after they have grown, the two ends of the harvesting plate are lifted outside the pool, and the plants are brought out of the pre-buried cylinder by the limiting cage.

[0023] S4: When pulling the limiting cage out of the pre-embedded cylinder, use a blade to cut the roots extending outward through the through groove to reduce the fixing effect of the plant roots.

[0024] S5: Lift the harvesting plate up along the support rod and make the limiting cage leave the water surface. Use the triangular blocks to support the harvesting plate and let it stand for a period of time to allow the soil and water on the surface of the plant and its roots to gradually fall off.

[0025] S6: The motor drives the gear to continuously and intermittently rotate forward and reverse, driving the toothed plate to reciprocate inside the mounting slot, controlling the up and down shaking of the plants inside the harvesting plate and the limiting cage, accelerating the falling of the soil and water attached to the plant surface downwards.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. The rural domestic sewage treatment device and sewage treatment method of the present invention utilizes a movable harvesting plate and a limiting cage to realize the planting and harvesting of plants, which is convenient for actual operation and can improve the planting and harvesting efficiency of plants. The entire process is carried out on the bank of the ecological treatment pond without the need for manual entry into the pond body, thus not damaging the substrate structure. After the plants are inoculated into the pre-buried cylinder, the pre-buried cylinder, the limiting cage and the connecting ring work together to limit, support and straighten the plants in the non-surviving state, prevent the plants from collapsing and increase the survival rate.

[0028] 2. The rural domestic sewage treatment device and sewage treatment method of the present invention, during the harvesting process, when the base is pulled out of the pre-buried cylinder, the base can bring the soil inside the pre-buried cylinder upwards, so that the limiting cage can be easily inserted into the pre-buried cylinder during subsequent planting operations. Moreover, during harvesting, the stems, leaves and roots of the plants can be taken out from the pool, thereby improving the degree of plant harvesting and the degree of removal of pollutants, thereby improving the sewage purification efficiency and preventing the roots from remaining inside the pool and affecting subsequent planting work.

[0029] 3. The rural domestic sewage treatment device and sewage treatment method of the present invention, by setting up a through-channel, after inoculation of plants, on the one hand, the sludge and sewage inside and outside the pre-buried cylinder can be slowly exchanged through the through-channel, improving the permeability of the pre-buried cylinder, facilitating the absorption of nitrogen and phosphorus by plant roots, and transporting oxygen to the roots through the stems, forming an aerobic microzone around the roots, promoting the conversion of ammonia nitrogen into nitrate by nitrifying bacteria. On the other hand, the plant roots can extend and proliferate outward through the through-channel, further improving the survival rate of plants and the range of root action. Attached Figure Description

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the structure of the ecological treatment pond in this invention;

[0032] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0033] Figure 3 This is a schematic diagram of the structure of the planting component and the harvesting component in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the planting board and the harvesting board in this invention;

[0035] Figure 5 This is a schematic diagram of the pre-embedded cylinder and the limiting cage in this invention;

[0036] Figure 6 This is a cross-sectional view of the pre-embedded cylinder and the limiting cage in this invention;

[0037] Figure 7 yes Figure 6 Enlarged view of a section at point B in the middle;

[0038] Figure 8 This is a cross-sectional view of the support rod in this invention;

[0039] Figure 9 This is a schematic diagram of the method flow of the present invention.

[0040] In the diagram: 1. Ecological treatment pool; 2. Planting board; 3. Pre-embedded cylinder; 4. Harvesting board; 5. Connecting ring; 6. Limiting cage; 7. Base; 8. Support rod; 9. Through groove; 10. Mounting ring; 11. Blade; 12. Gas storage box; 13. Compression plate; 14. Spring 1; 15. Operating block; 16. Gas supply pipe; 17. Guide block; 18. Spring 2; 19. Elastic element; 20. Conduit; 21. Groove; 22. Triangular block; 23. Spring 3; 24. Sliding groove; 25. Sliding block; 26. Connecting rope; 27. Mounting groove; 28. Toothed plate; 29. ​​Gear; 30. Motor; 31. Roller; 32. Protrusion. Detailed Implementation

[0041] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0042] like Figures 1 to 8 As shown, the rural domestic sewage treatment device of the present invention includes an ecological treatment pond 1, a planting component and a harvesting component; the ecological treatment pond 1 is provided with a pebble layer, a gravel layer and a soil layer from bottom to top; the planting component and the harvesting component are each provided in a set and correspond to each other, and the harvesting component is located above the planting component.

[0043] The planting component includes a planting board 2, and both ends of the planting board 2 are fixedly connected to the inner wall of the ecological treatment pool 1; a set of pre-embedded cylinders 3 are evenly distributed on the surface of the planting board 2;

[0044] The installation of the planting board 2 and the pre-embedded cylinder 3 is completed when the soil layer is laid, and the planting board 2 is kept on the surface of the soil layer, the pre-embedded cylinder 3 is inserted into the soil layer, and the top of the pre-embedded cylinder 3 is slightly higher than the surface of the soil layer.

[0045] The harvesting assembly includes a U-shaped harvesting plate 4, with both ends of the harvesting plate 4 resting on the top of the ecological treatment pool 1; a set of connecting rings 5 ​​are evenly distributed on the surface of the harvesting plate 4 at the corresponding positions of the pre-embedded cylinder 3; a limiting cage 6 is fixedly connected to the lower side of the connecting ring 5; a base 7 is fixedly connected to the lower end of the limiting cage 6, and the base 7 is located inside the pre-embedded cylinder 3.

[0046] In the current technology of treating rural domestic sewage using constructed wetland systems, manual harvesting of plants is required, which necessitates manual entry into the pool to use tools such as sickles. However, the surface soil matrix inside the pool gradually softens under the long-term soaking of sewage, forming a fine and soft silt. This not only makes it difficult for people to move around and harvest the plants, but also damages the matrix structure during trampling, reducing the subsequent sewage treatment effect of the wetland system.

[0047] In this invention, when planting plants in the ecological treatment pool 1, the plants are sequentially placed inside the multiple connecting rings 5 ​​and the limiting cages 6 of the harvesting plate 4, so that the roots of the plants fall on the surface of the base 7. Then, the two ends of the harvesting plate 4 are lifted and the entire harvesting plate 4 is placed in the water in the ecological treatment pool 1, so that the two ends of the harvesting plate 4 are attached to the top of the side wall of the ecological treatment pool 1 and the harvesting plate 4 is aligned with the planting plate 2. The multiple limiting cages 6 and the base 7 are respectively inserted into the corresponding pre-buried cylinders 3. Subsequently, the plants can grow and purify the water quality inside the pre-buried cylinders 3 and the limiting cages 6. When the plants are ready for harvesting, the two ends of the harvesting plate 4 are lifted from the outside of the pool, and the plants are pulled out of the pre-buried cylinders 3 by the limiting cages 6, thus realizing the removal and harvesting of the plants.

[0048] This invention utilizes a movable harvesting plate 4 and a limiting cage 6 to achieve plant planting and harvesting, facilitating practical operation and improving plant planting and harvesting efficiency. The entire process takes place on the bank of the ecological treatment pond 1, without requiring manual entry into the pond, thus avoiding damage to the substrate structure. After the plants are inoculated into the pre-buried cylinder 3, the pre-buried cylinder 3, the limiting cage 6, and the connecting ring 5 work together to limit, support, and straighten the plants in a non-surviving state, preventing them from collapsing and increasing their survival rate. In addition, during harvesting, when the base 7 is pulled out of the pre-buried cylinder 3, the base 7 can bring the soil inside the pre-buried cylinder 3 upwards, making it easier to insert the limiting cage 6 into the pre-buried cylinder 3 during subsequent planting operations. Furthermore, during harvesting, the stems, leaves, and roots of the plants can all be removed from the pond, thereby improving the degree of plant harvesting and the removal of pollutants, indirectly improving the purification efficiency of wastewater, and preventing root residues inside the pond from affecting subsequent planting work.

[0049] In another embodiment of the present invention, a set of support rods 8 are evenly distributed at both ends of the harvesting plate 4 on the top of the ecological treatment pool 1, and the support rods 8 pass through the ends of the harvesting plate 4 and are slidably connected to them. By setting the support rods 8 to position the harvesting plate 4, the limiting cage 6 can accurately enter the pre-embedded cylinder 3 when the harvesting plate 4 is placed.

[0050] In another embodiment of the present invention, a set of through grooves 9 are evenly distributed on the surface of the pre-embedded cylinder 3. By setting the through grooves 9, after the plants are inoculated, on the one hand, the sludge and sewage inside and outside the pre-embedded cylinder 3 can be slowly exchanged through the through grooves 9, which improves the permeability of the pre-embedded cylinder 3, facilitates the absorption of nitrogen and phosphorus by the plant roots, and facilitates the transport of oxygen to the roots through the stems, forming an aerobic microzone around the roots, promoting the conversion of ammonia nitrogen into nitrate by nitrifying bacteria. On the other hand, the plant roots can extend and proliferate through the through grooves 9, further improving the survival rate of the plants and the range of action of the roots.

[0051] In another embodiment of the present invention, a mounting ring 10 is provided at the top edge of the base 7; an annular blade 11 is fixedly connected to the upper edge of the mounting ring 10. By providing the mounting ring 10 and the blade 11, when the limiting cage 6 and the base 7 are pulled out of the pre-embedded cylinder 3, the annular blade 11 at the edge of the base 7 can move along the inner wall of the pre-embedded cylinder 3 and cut off the roots extending outward through the through groove 9, reducing the fixing effect of the plant roots, making it easier to bring the plant upward and improving harvesting efficiency.

[0052] A gas storage box 12 is fixedly connected to the end of the harvesting plate 4; a compression plate 13 is slidably and sealed inside the gas storage box 12; a spring 14 is fixedly connected between the compression plate 13 and the gas storage box 12; an operating block 15 is provided above the gas storage box 12; the operating block 15 is fixedly connected to the compression plate 13 by a connecting rod.

[0053] The bottom of the gas storage box 12 is connected to a gas delivery pipe 16; the gas delivery pipe 16 passes sequentially around the surface of the harvesting plate 4, the limiting cage 6, and the inside of the base 7; a guide block 17 is fixedly connected to the lower side of the mounting ring 10, and the guide block 17 is slidably connected to the base 7; a spring 18 is fixedly connected between the mounting ring 10 and the base 7; a hollow elastic element 19 is fixedly connected between the guide block 17 and the base 7; the elastic element 19 is connected to the gas delivery pipe 16 through a conduit 20.

[0054] During the process of cutting plant roots with blade 11, if the roots are hard or well-developed and difficult to cut, the operating block 15 can be pressed intermittently to drive the compression plate 13 to move downward inside the air storage box 12. The air in the air storage box 12 is then transported through the air supply pipe 16 and the conduit 20 to the elastic members 19 of the multiple bases 7, causing the elastic members 19 to expand and deform, and push the guide block 17 and the mounting ring 10 upward. This causes the blade 11 to move up and down in small amplitudes, thereby repeatedly impacting and cutting the roots. This improves the root breaking efficiency, allowing the plants to be removed and harvested smoothly. In addition, the mounting ring 10 continuously impacts the plant roots during this process, which helps the soil attached to the root surface to fall off, preventing the soil from being carried out and causing the loss of the substrate inside the pool.

[0055] In another embodiment of the present invention, a pair of grooves 21 are symmetrically provided on both sides of the top of the support rod 8; a triangular block 22 is provided inside the groove 21, and the bottom of the triangular block 22 is hinged to the groove 21; a spring 23 is fixedly connected between the side of the triangular block 22 and the groove 21.

[0056] When harvesting plants, the harvesting plate 4 is first lifted upwards along the support rod 8 for a certain distance, so that the harvesting plate 4 squeezes the inclined surface of the triangular block 22 and squeezes it into the groove 21. After the harvesting plate 4 passes the triangular block 22, the spring 3 23 pushes the triangular block 22 to extend outwards again, and then the harvesting plate 4 is released. The triangular block 22 can support the harvesting plate 4. At this time, the harvesting plate 4 and the limiting cage 6 have left the water surface. Then, it is left to stand for a period of time. After the soil and water on the surface of the plants and their roots gradually fall off, the harvesting plate 4 is lifted upwards, so as to retain the sludge and sewage inside the ecological treatment pond 1 as much as possible, preventing it from polluting the external environment and causing soil loss.

[0057] In another embodiment of the present invention, an installation groove 27 is provided on the outer side of the ecological treatment pool 1; a toothed plate 28 is slidably connected inside the installation groove 27; a gear 29 is rotatably connected inside the installation groove 27, and the gear 29 is driven and controlled by a motor 30; the gear 29 meshes with the lower side of the toothed plate 28; the support rod 8 is slidably connected to the ecological treatment pool 1; the bottom of the support rod 8 extends into the installation groove 27 and is rotatably connected to a roller 31, and the roller 31 is attached to the upper side of the toothed plate 28; a set of protrusions 32 are evenly distributed on the upper side of the toothed plate 28.

[0058] During the process of the limiting cage 6 leaving the water surface and remaining stationary, the motor 30 drives the gear 29 to continuously rotate in both forward and reverse directions, driving the toothed plate 28 to reciprocate inside the mounting groove 27. This causes the roller 31 at the lower end of the support rod 8 to roll on the surface of the toothed plate 28. When the roller 31 rolls to the surface of the protrusion 32, it will drive the support rod 8 to move upward, and use the triangular block 22 to lift the harvesting plate 4 a short distance. When the roller 31 leaves the surface of the protrusion 32, the harvesting plate 4 falls downward under the action of gravity, thereby controlling the harvesting plate 4 and the plants inside its limiting cage 6 to continuously shake up and down, further accelerating the downward fall of the soil and water attached to the plant surface, improving the separation efficiency, and reducing the residue of soil and water.

[0059] In another embodiment of the present invention, a groove 24 is provided at the top of the support rod 8; a slider 25 is slidably connected inside the groove 24, and the top of the slider 25 protrudes from the surface of the support rod 8; a connecting rope 26 is fixedly connected between the bottom of the slider 25 and the triangular block 22, and the connecting rope 26 passes through the groove 24 and the recess 21, with a guide wheel provided at the bend of the connecting rope 26. When placing the harvesting plate 4, the support rod 8 is aligned and inserted into the end of the harvesting plate 4, and then the slider 25 is pulled upwards. The connecting rope 26 drives a pair of triangular blocks 22 to converge towards the center and enter the recess 21, so that the harvesting plate 4 can be smoothly lowered and the limiting cage 6 is inserted into the pre-embedded cylinder 3.

[0060] like Figure 9As shown, the present invention provides a method for treating rural domestic sewage, which uses the aforementioned rural domestic sewage treatment device and includes the following steps:

[0061] S1: Lay a pebble layer, a crushed stone layer and a soil layer inside the ecological treatment pond 1, install a planting board 2 and a pre-buried cylinder 3, and introduce sewage into the ecological treatment pond 1.

[0062] S2: Place the plant into the multiple connecting rings 5 ​​and the limiting cage 6 of the harvesting plate 4 in sequence, place the harvesting plate 4 in the water body in the ecological treatment pond 1, and the limiting cage 6 and the base 7 enter the corresponding pre-buried cylinder 3 respectively. The plant can then grow and purify the water quality inside the pre-buried cylinder 3 and the limiting cage 6.

[0063] S3: When the plants are ready to be harvested after they have grown, the two ends of the harvesting plate 4 are lifted outside the pool, and the plant is brought out of the pre-buried cylinder 3 by the limiting cage 6.

[0064] S4: When the limiting cage 6 is pulled out of the pre-embedded cylinder 3, the root system extending outward through the through groove 9 is cut off by the blade 11 to reduce the fixing effect of the plant root system.

[0065] S5: Lift the harvesting plate 4 upward along the support rod 8 and make the limiting cage 6 leave the water surface. Use the triangular block 22 to support the harvesting plate 4. Let it stand for a period of time to allow the soil and water on the surface of the plant and its roots to gradually fall off.

[0066] S6: The motor 30 drives the gear 29 to continuously rotate in both forward and reverse directions, driving the toothed plate 28 to reciprocate inside the mounting slot 27, controlling the up and down shaking of the plants inside the harvesting plate 4 and the limiting cage 6, accelerating the falling of the soil and water attached to the plant surface downwards.

[0067] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0068] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0069] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A rural domestic sewage treatment device, characterized in that: It includes an ecological treatment pond (1), a planting component and a harvesting component; each of the planting component and the harvesting component is provided in a set and corresponds to each other, and the harvesting component is located above the planting component; The planting component includes a planting board (2), and both ends of the planting board (2) are fixedly connected to the inner wall of the ecological treatment pool (1); a set of pre-embedded cylinders (3) are evenly distributed on the surface of the planting board (2); The harvesting assembly includes a "U"-shaped harvesting plate (4), with both ends of the harvesting plate (4) mounted on the top of the ecological treatment pond (1); a set of connecting rings (5) are evenly distributed on the surface of the harvesting plate (4) at the corresponding positions of the pre-embedded cylinder (3); a limiting cage (6) is fixedly connected to the lower side of the connecting ring (5); a base (7) is fixedly connected to the lower end of the limiting cage (6).

2. The rural domestic sewage treatment device according to claim 1, characterized in that: The top of the ecological treatment pool (1) is evenly distributed with a set of support rods (8) at both ends of the harvesting plate (4), and the support rods (8) pass through the end of the harvesting plate (4) and are slidably connected to it.

3. A rural domestic sewage treatment device according to claim 2, characterized in that: A set of through grooves (9) are evenly distributed on the surface of the pre-embedded cylinder (3).

4. A rural domestic sewage treatment device according to claim 3, characterized in that: A mounting ring (10) is provided at the top edge of the base (7); a ring-shaped blade (11) is fixedly connected to the upper edge of the mounting ring (10).

5. A rural domestic sewage treatment device according to claim 4, characterized in that: A gas storage box (12) is fixedly connected to the end of the harvesting plate (4); a compression plate (13) is slidably and sealed inside the gas storage box (12); a spring (14) is fixedly connected between the compression plate (13) and the gas storage box (12); an operating block (15) is provided above the gas storage box (12); the operating block (15) and the compression plate (13) are fixedly connected by a connecting rod. The bottom of the gas storage box (12) is connected to a gas delivery pipe (16); the gas delivery pipe (16) passes around the surface of the harvesting plate (4), the limiting cage (6) and the inside of the base (7) in sequence; a guide block (17) is fixedly connected to the lower side of the mounting ring (10), and the guide block (17) is slidably connected to the base (7); a spring (18) is fixedly connected between the mounting ring (10) and the base (7); a hollow elastic element (19) is fixedly connected between the guide block (17) and the base (7); the elastic element (19) is connected to the gas delivery pipe (16) through a conduit (20).

6. A rural domestic sewage treatment device according to claim 5, characterized in that: The support rod (8) has a pair of grooves (21) symmetrically opened on both sides of the top; a triangular block (22) is provided inside the groove (21), and the bottom of the triangular block (22) is hinged to the groove (21); a spring (23) is fixedly connected between the side of the triangular block (22) and the groove (21).

7. A rural domestic sewage treatment device according to claim 6, characterized in that: The top of the support rod (8) is provided with a groove (24); a slider (25) is slidably connected inside the groove (24); a connecting rope (26) is fixedly connected between the bottom of the slider (25) and the triangular block (22).

8. A rural domestic sewage treatment device according to claim 7, characterized in that: An installation groove (27) is provided on the outside of the ecological treatment pool (1); a toothed plate (28) is slidably connected inside the installation groove (27); a gear (29) is rotatably connected inside the installation groove (27), and the gear (29) is driven and controlled by a motor (30); the gear (29) meshes with the lower side of the toothed plate (28); the support rod (8) is slidably connected to the ecological treatment pool (1); the bottom of the support rod (8) extends into the installation groove (27) and is rotatably connected to a roller (31); a set of protrusions (32) are evenly distributed on the upper side of the toothed plate (28).

9. A method for treating rural domestic sewage, the method employing the rural domestic sewage treatment device as described in claim 8, characterized in that: Includes the following steps: S1: Lay a pebble layer, a gravel layer and a soil layer inside the ecological treatment pond (1), install a planting board (2) and a pre-buried cylinder (3) to introduce sewage into the ecological treatment pond (1); S2: Place the plant into the multiple connecting rings (5) and the limiting cage (6) of the harvesting plate (4) in sequence. Place the harvesting plate (4) in the water in the ecological treatment pond (1). The limiting cage (6) and the base (7) enter the corresponding pre-buried cylinder (3) respectively. The plant can then grow and purify the water inside the pre-buried cylinder (3) and the limiting cage (6). S3: When the plants are ready to be harvested after they have grown, the harvesting plate (4) is lifted from both ends outside the pool, and the plant is pulled out of the pre-buried cylinder (3) by the limiting cage (6).

10. A method for treating rural domestic sewage according to claim 9, characterized in that: It also includes the following steps: S4: When the limiting cage (6) is pulled out of the pre-embedded cylinder (3), the root system extending outward through the through groove (9) is cut off by the blade (11) to reduce the fixing effect of the plant root system. S5: Lift the harvesting plate (4) up along the support rod (8) and make the limiting cage (6) leave the water surface. Use the triangular block (22) to support the harvesting plate (4), and let it stand for a period of time to allow the soil and water on the surface of the plant and its roots to gradually fall off. S6: The motor (30) drives the gear (29) to continuously and intermittently rotate forward and reverse, driving the toothed plate (28) to reciprocate inside the mounting slot (27), controlling the up and down shaking of the plants inside the harvesting plate (4) and the limiting cage (6), accelerating the falling of the soil and water attached to the plant surface downwards.

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