Horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source

Abstract

The application relates to a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon sources, and belongs to the technical field of environmental protection and water treatment technology. The system comprises a water inlet collecting area, a carbon source adding unit arranged in the water inlet collecting area, a ceramsite type wetland unit connected with the water inlet collecting area, a brick slag type wetland unit connected with the ceramsite type wetland unit, a zeolite type wetland unit connected with the brick slag type wetland unit, an oyster shell type wetland unit connected with the zeolite type wetland unit, and a water outlet collecting area connected with the oyster shell type wetland unit. Plants are planted on the ceramsite type wetland unit, the brick slag type wetland unit, the zeolite type wetland unit and the oyster shell type wetland unit. Agricultural wastes are arranged in the carbon source adding unit. Water in the water inlet collecting area enters the ceramsite type wetland unit through the carbon source adding unit and a water passing assembly. The application has the effects of maintaining sufficient carbon sources in the wetland system, applying agricultural wastes to the water treatment wetland system, and improving the utilization rate of the agricultural wastes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental protection water treatment technology, and particularly relates to a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source. BACKGROUND

[0002] With the acceleration of urbanization process in China, the demand for water resources is increasing, and at the same time, sewage is highly concentrated, and the water environment is under great pressure. One of the main reasons for the deterioration of the water environment is that the nitrogen and phosphorus in the sewage are not up to standard and are discharged into the water. A large amount of nitrogen and phosphorus pollutants discharged into surface water will cause water eutrophication. Therefore, it is urgent to efficiently remove nitrogen and phosphorus pollutants in sewage. As an environmentally friendly biological sewage treatment technology, constructed wetland relies on the synergistic effect of plants, substrates and microorganisms to efficiently remove nitrogen, phosphorus and other pollutants in water, and is widely used in sewage advanced treatment. However, the problem of low carbon-nitrogen ratio (C / N) in sewage is common at present, and the lack of carbon source makes the denitrifying bacteria unable to obtain sufficient electron donor, and the denitrification is limited, thereby inhibiting the denitrification effect of the constructed wetland system.

[0003] Moreover, agricultural biomass such as straw, corn cob and rice straw is agricultural waste in China, which is low in cost and high in yield. According to statistics, in 2015, the theoretical yield of straw of main crops in China was 1.04 billion tons, and the collectable straw resource amount was 900 million tons, of which the amount of off-field utilization only accounted for 36.9%. The utilization rate of agricultural waste is low.

[0004] At the same time, in the existing constructed wetland system, ceramic and zeolite are basically used for water treatment, and the diversity and quantity of microbial community in the wetland system are relatively small, and the water treatment capacity of the whole system is weak. SUMMARY

[0005] In order to maintain sufficient carbon source in the wetland system, and apply agricultural waste to the water treatment wetland system, improve the utilization rate of agricultural waste, and improve the water treatment capacity of the wetland system, the present application provides a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source.

[0006] The horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source provided by the present application adopts the following technical scheme:

[0007] The application discloses a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source, which comprises a water inlet collecting area, wherein a carbon source adding unit is arranged, the water inlet collecting area is connected with a ceramsite type wetland unit, the ceramsite type wetland unit is connected with a brick slag type wetland unit, the brick slag type wetland unit is connected with a zeolite type wetland unit, the zeolite type wetland unit is connected with a oyster shell type wetland unit, the oyster shell type wetland unit is connected with a water outlet collecting area, plants are planted on the ceramsite type wetland unit, the brick slag type wetland unit, the zeolite type wetland unit and the oyster shell type wetland unit, water passing components are arranged between the water inlet collecting area and the ceramsite type wetland unit, between the ceramsite type wetland unit and the brick slag type wetland unit, between the brick slag type wetland unit and the zeolite type wetland unit, between the zeolite type wetland unit and the oyster shell type wetland unit and between the oyster shell type wetland unit and the water outlet collecting area, agricultural wastes are arranged in the carbon source adding unit, and water in the water inlet collecting area enters the ceramsite type wetland unit through the carbon source adding unit and the water passing components.

[0008] By using the above technical scheme, the agricultural wastes contain abundant cellulose and hemicellulose, which can be added to the constructed wetland system as external carbon source, can provide the required energy for denitrifying bacteria to denitrify and self-reproduce, and can also serve as a carrier for the growth and reproduction of microorganisms.

[0009] Meanwhile, the agricultural biomass carbon source has a slow release rate and a long effective period, and can reduce secondary pollution and water quality fluctuation caused by multiple additions. Therefore, the agricultural wastes as the external carbon source of the constructed wetland system not only solve the problem that the denitrification of the system is limited due to the low concentration of organic matter in the water, but also improve the effective utilization rate of the agricultural wastes.

[0010] In addition, the brick slag has a porous structure, can provide attachment points for microorganisms and effectively adsorb pollutants, and can increase the adsorption capacity of the wetland system for pollutants, especially heavy metals, phosphate and ammonia nitrogen. The oyster shell is rich in calcium carbonate, can adjust the pH value of the water, and is helpful for adsorbing phosphorus in the water. The brick slag and the oyster shell provide a good habitat for wetland microorganisms and increase the diversity of the microbial population.

[0011] In summary, the scheme can maintain sufficient carbon source in the wetland system, apply the agricultural wastes to the water treatment wetland system, improve the utilization rate of the agricultural wastes, and improve the water treatment capacity of the wetland system.

[0012] Optionally, the carbon source adding unit comprises a plurality of receiving tubes for containing the agricultural wastes, and a plurality of first water passing holes are formed in the receiving tubes.

[0013] Optionally, each of the receiving tubes is covered by a cover plate, the receiving tubes are square tubes, adjacent receiving tubes are spliced with each other, and adjacent cover plates are spliced with each other.

[0014] By using the above technical scheme, the cover plate isolates the contact between the carbon source and oxygen, and avoids the influence of sunlight direct irradiation and the temperature of the carbon source on the drying degree of the carbon source.

[0015] Optionally, the particle size of the ceramsite in the ceramsite type wetland unit is 5-10 mm, the particle size of the brick slag in the brick slag type wetland unit is 10-20 mm, the particle size of the zeolite in the zeolite type wetland unit is 8-16 mm, and the particle size of the oyster shell in the oyster shell type wetland unit is 20-30 mm; the water passing assembly is a plurality of perforated water distribution pipes, and the plurality of perforated water distribution pipes are arranged.

[0016] Optionally, the plants include reed, canna, acorus and iris, the reed and the canna are planted on the ceramsite type wetland unit, the acorus is planted on the brick slag type wetland unit and the zeolite type wetland unit, and the iris is planted on the oyster shell type wetland unit.

[0017] By using the above technical scheme, the reed has strong pollution resistance and developed root system, and can well treat high-concentration organic matter and pollutants in the inflow water. The root system of the reed can provide more attachment points for denitrifying bacteria and has strong oxygen transport capacity, which helps to provide help for the preliminary purification of the water body.

[0018] The canna not only has good ornamental value, but also has strong absorption capacity for nutrients such as nitrogen and phosphorus, and is suitable for planting in the ceramsite area after the water quality is treated, to further purify the water quality. The canna has shallow root system and is suitable for being arranged in the middle and shallow layers.

[0019] The acorus has strong adaptability and can grow well in areas containing more minerals, and is particularly suitable for being planted in areas of materials such as brick slag or zeolite which have adsorption capacity. These areas are usually areas where some pollutants have been treated and need plants to further absorb nitrogen and phosphorus.

[0020] The iris is a plant very suitable for wetland environment and has strong absorption capacity for nitrogen and phosphorus in water. The rhizome of the iris can provide a good living environment for microorganisms on the oyster shell, and especially in the treatment terminal stage, can help to further purify the water body.

[0021] Optionally, an opening assembly for opening the cover plate is arranged on the inflow water collecting area, a discharging assembly for pushing the agricultural waste out of the receiving tube is arranged in the receiving tube, and a hole sealing assembly for plugging the first water passing hole is arranged in the receiving tube.

[0022] By adopting the above technical scheme, the agricultural waste is usually replaced within 3-6 months, so as to ensure that sufficient carbon source is provided for the water body. When the agricultural waste is replaced, the cover plate is first separated from the storage tube by using the opening assembly, then the hole sealing assembly is installed to avoid damage of the discharging assembly caused by being soaked in water during discharging, then the discharging assembly is started to push the agricultural waste out of the storage tube, the discharged agricultural waste is collected, then the discharging assembly is reset, new agricultural waste is put into the storage tube, finally the hole sealing assembly is taken out and the cover plate is re-covered, so that the replacement of the agricultural waste is facilitated.

[0023] Optionally, the opening assembly comprises a walking catwalk, the walking catwalk is arranged on the top of the water inlet collecting area, a sliding groove is arranged in the walking catwalk, the sliding groove penetrates to the side of the walking catwalk facing the cover plate, a baffle is arranged on the side of the sliding groove close to the cover plate, the cover plate is connected with a limiting plate, the cover plate penetrates through the baffle and extends into the sliding groove, the limiting plate is located in the sliding groove, and the limiting plate abuts against the baffle when the cover plate covers the storage tube. A plurality of pull-out grooves are arranged on each cover plate.

[0024] By adopting the above technical scheme, the staff can stand on the walking catwalk, then hold the pull-out grooves with hands, and gradually push the cover plate into the sliding groove, so as to separate the cover plate from the storage tube. When it is necessary to cover the cover plate again, the staff only needs to hold the pull-out grooves and push the cover plate out of the sliding groove again until the limiting plate abuts against the baffle, so that the cover plate is covered on the storage tube again.

[0025] Optionally, the discharging assembly comprises a mounting frame, a rotating disc is rotatably connected to the mounting frame, the rotating disc is driven by a driving member, a plurality of first connecting rods are hingedly connected to the mounting frame, each first connecting rod is connected to the rotating disc through a linkage member, a plurality of second connecting rods are hingedly connected to each first connecting rod, the middle portions of a plurality of second connecting rods are commonly hingedly connected to a connecting ring, one end of each second connecting rod away from the second connecting rod is hingedly connected to another second connecting rod, a plurality of connecting rings are stacked above the mounting frame, each connecting ring is connected to a plurality of second connecting rods, adjacent second connecting rods are hingedly connected to each other, a plurality of second connecting rods away from the rotating disc are connected to a third connecting rod, and all third connecting rods are commonly hingedly connected to a pushing plate. When the rotating disc rotates, the driving member drives the first connecting rods to swing.

[0026] By adopting the above technical scheme, when discharging, the driving member drives the rotating disc to rotate, the rotation drives the first connecting rods to swing, the swing of the first connecting rods drives the second connecting rods to swing, the swing of the second connecting rods drives the third connecting rods to swing, so that the pushing plate and the connecting ring are synchronously pushed upward, the pushing plate gradually pushes the agricultural waste out of the storage tube, and the pushing plate is located at the opening of the storage tube. At this time, the staff can stand on the walking catwalk and the pushing plate, so that the agricultural waste is conveniently cleaned.

[0027] After the agricultural waste material is cleaned, the driving member drives the rotating disc to rotate in the opposite direction, so that the first connecting rod, the second connecting rod and the third connecting rod swing to a folded state, at this time, the connecting ring and the push plate are located at the bottom of the storage tube again, which is convenient for the staff to add new agricultural waste materials into the storage tube.

[0028] Optionally, the driving member comprises a driving shaft, the driving shaft passes through all the storage tubes, one end of the driving shaft is connected with a motor, each of the storage tubes is provided with a first bevel gear, the first bevel gear is coaxially fixed on the driving shaft, the rotating disc is coaxially fixed with a second bevel gear, the first bevel gear is engaged with the corresponding second bevel gear.

[0029] The connecting member comprises a spur gear, the spur gear is rotationally connected to the mounting frame, the spur gear corresponds to the first connecting rod one by one, the rotating disc is provided with an outer ring gear in the circumferential direction, the spur gear is engaged with the outer ring gear, the spur gear is coaxially connected with a third bevel gear, the first connecting rod is provided with a fourth bevel gear, and the fourth bevel gear is engaged with the third bevel gear.

[0030] By adopting the above technical scheme, the motor drives the driving shaft to rotate, the driving shaft drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear, the rotating disc and the outer ring gear to rotate synchronously, the outer ring gear drives the spur gear and the third bevel gear to rotate synchronously, and the third bevel gear drives the fourth bevel gear to rotate, so that the rotating disc is driven to swing when rotating, the second connecting rod and the third connecting rod are simultaneously driven to swing to drive the push plate to lift.

[0031] Optionally, the hole sealing assembly comprises an inner nest, the inner nest is located in the storage tube, a sealing space is left between the outer side wall of the inner nest and the inner side wall of the storage tube, the inner nest and the storage tube are connected through a connecting plate, the driving shaft passes through the storage tube, the connecting plate and the inner nest, the agricultural waste material, the mounting frame and the push plate are located in the inner nest, a sealing plate is inserted between the outer side wall of the inner nest and the inner side wall of the storage tube, the push plate is matched with the inner nest, a plurality of second water holes are formed in the circumferential surface of the inner nest, and all the second water holes are located above the push plate before the push plate pushes the material.

[0032] By adopting the above technical scheme, water can pass through the storage tube and the inner nest through the first water hole and the second water hole, and the sealing plate is inserted into the sealing space before the material is discharged, so that the water flow into the inner nest is effectively avoided.

[0033] In summary, the present application has at least one of the following beneficial technical effects:

[0034] 1. Agricultural waste contains rich cellulose and hemicellulose, which can be added as an additional carbon source to the constructed wetland system, providing the required energy for denitrifying bacteria to denitrify and reproduce, and also serving as a carrier for microbial growth and reproduction;

[0035] At the same time, the release rate of agricultural biomass carbon source is slow, and the effective period is long, which can reduce the secondary pollution and water quality fluctuations caused by multiple additions. Therefore, using agricultural waste as an additional carbon source for the constructed wetland system not only makes up for the low concentration of organic matter in the influent, which limits the denitrification of the system, but also improves the effective utilization rate of agricultural waste;

[0036] 2. And the brick slag has a porous structure, which can provide attachment points for microorganisms and effectively adsorb pollutants, increasing the adsorption capacity of the wetland system for pollutants, especially heavy metals, phosphates and ammonia nitrogen. Oyster shells are rich in calcium carbonate, which can adjust the pH value of the water and help adsorb phosphorus in the water. Brick slag and oyster shells provide a good habitat for wetland microorganisms and increase the diversity of microbial populations;

[0037] 3. The cover plate prevents the carbon source from contacting oxygen and avoids the influence of sunlight and temperature on the carbon source;

[0038] 4. Agricultural waste is usually replaced within 3-6 months to ensure sufficient carbon source for the water body. When replacing the agricultural waste, first separate the cover plate from the storage tube using the opening assembly, then install the hole sealing assembly to avoid damage caused by the discharge assembly being soaked in water during the discharge process, then start the discharge assembly to push the agricultural waste out of the storage tube, collect the pushed agricultural waste, then reset the discharge assembly, put new agricultural waste into the storage tube, and finally remove the hole sealing assembly and cover the cover plate again to facilitate the replacement of agricultural waste. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0040] Figure 2 is a schematic diagram of the structure of the embodiment of the present application for embodying the discharge assembly and the hole sealing assembly.

[0041] Figure 3 is a schematic diagram of the structure of the embodiment of the present application for embodying the cover plate and the walking catwalk. Figure 2

[0042] Figure 4 is a schematic diagram of the structure of the embodiment of the present application for embodying the push plate, the inner nest, the connecting plate and the blocking plate.

[0043] Figure 5 is a schematic diagram of the structure of the embodiment of the present application for embodying the push plate, the inner nest, the connecting plate and the blocking plate. ​

[0044] Figure 6 is a structural schematic diagram for embodying a linkage of the embodiment of the present application.

[0045] Figure 7 is a structural schematic diagram for embodying a second water hole of the embodiment of the present application.

[0046] The label explanation: 11, water inlet collection area; 111, water inlet pipe; 12, carbon source adding unit; 121, storage pipe; 1211, first water hole; 1212, pull slot; 122, cover plate; 13, ceramic type wetland unit; 14, brick type wetland unit; 15, zeolite type wetland unit; 16, oyster shell type wetland unit; 17, water outlet collection area; 171, water outlet pipe; 18, plant; 181, reed; 182, canna; 183, acorus; 184, iris; 19, partition; 2, water passing assembly; 21, perforated water distribution pipe; 3, opening assembly; 31, walking stack; 311, sliding groove; 312, baffle; 313, limiting plate; 4, discharging assembly; 41, mounting frame; 42, rotating disc; 43, driving member; 431, driving shaft; 432, motor; 433, first bevel gear; 434, second bevel gear; 44, first connecting rod; 45, linkage; 451, straight gear; 452, outer ring gear; 453, third bevel gear; 454, fourth bevel gear; 46, second connecting rod; 47, connecting ring; 48, third connecting rod; 49, push plate; 5, hole sealing assembly; 51, inner nest; 511, second water hole; 52, connecting plate; 53, plugging plate. DETAILED DESCRIPTION

[0047] The following will be described in detail below Figures 1-7 The present application will be further described in detail.

[0048] Embodiment 1

[0049] The embodiment of the present application discloses a horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source.

[0050] As Figure 1 The horizontal subsurface flow constructed wetland system capable of adding agricultural biomass carbon source comprises a water inlet collection area 11, the water inlet collection area 11 is provided with a carbon source adding unit 12, the water inlet collection area 11 is connected with a ceramic type wetland unit 13, the ceramic type wetland unit 13 is connected with a brick type wetland unit 14, the brick type wetland unit 14 is connected with a zeolite type wetland unit 15, the zeolite type wetland unit 15 is connected with an oyster shell type wetland unit 16, and the oyster shell type wetland unit 16 is connected with a water outlet collection area 17.

[0051] The plant 18 is planted on the ceramsite type wetland unit 13, the brick type wetland unit 14, the zeolite type wetland unit 15 and the oyster shell type wetland unit 16, and the water passing assembly 2 is arranged between the water inlet collecting area 11 and the ceramsite type wetland unit 13, between the ceramsite type wetland unit 13 and the brick type wetland unit 14, between the brick type wetland unit 14 and the zeolite type wetland unit 15, between the zeolite type wetland unit 15 and the oyster shell type wetland unit 16, and between the oyster shell type wetland unit 16 and the water outlet collecting area 17.

[0052] The carbon source adding unit 12 is internally provided with agricultural waste, and the water in the water inlet collecting area 11 enters the ceramsite type wetland unit 13 through the carbon source adding unit 12 and the water passing assembly 2.

[0053] The carbon source adding unit 12 comprises a plurality of receiving tubes 121, the receiving tube 121 is a square tube, and a plurality of first water passing holes 1211 are formed in the receiving tube 121, the side walls of adjacent receiving tubes 121 are attached to each other, the agricultural waste is filled in the receiving tube 121, the top of each receiving tube 121 is covered with a cover plate 122, the cover plate 122 is a square plate, the side surfaces of adjacent cover plates 122 are attached to each other, and the water passing assembly 2 is a plurality of perforated water distribution pipes 21, and adjacent perforated water distribution pipes 21 are arranged to be attached to each other.

[0054] The top of the receiving tube 121 is higher than the top of the ceramsite type wetland unit 13, the brick type wetland unit 14, the zeolite type wetland unit 15 and the oyster shell type wetland unit 16, the top of the water inlet collecting area 11 is connected with a water inlet pipe 111, the bottom of the water inlet pipe 111 is higher than the top of the ceramsite type wetland unit 13, the brick type wetland unit 14, the zeolite type wetland unit 15 and the oyster shell type wetland unit 16, and the bottom of the water outlet collecting area 17 is connected with a water outlet pipe 171, and the top of each perforated water distribution pipe 21 is provided with a partition plate 19.

[0055] The plant 18 comprises reed 181, canna 182, aconitum 183 and iris 184, the reed 181 and the canna 182 are planted on the ceramsite type wetland unit 13, the aconitum 183 is planted on the brick type wetland unit 14 and the zeolite type wetland unit 15, and the iris 184 is planted on the oyster shell type wetland unit 16.

[0056] The particle size of the ceramsite in the ceramsite type wetland unit 13 is 5-10 mm, the particle size of the brick in the brick type wetland unit 14 is 10-20 mm, the particle size of the zeolite in the zeolite type wetland unit 15 is 8-16 mm, and the particle size of the oyster shell in the oyster shell type wetland unit 16 is 20-30 mm.

[0057] The agricultural waste contains abundant cellulose and hemicellulose, which can be added as an external carbon source to the constructed wetland system, can provide the required energy for denitrifying bacteria to denitrify and self-reproduce, and can also serve as a carrier for microbial growth and reproduction.

[0058] At the same time, the agricultural biomass carbon source has a slow release rate and a long effective period, which can reduce secondary pollution and water quality fluctuations caused by multiple dosing. Therefore, using agricultural waste as an additional carbon source in the constructed wetland system not only makes up for the low concentration of organic matter in the influent, which limits the denitrification and nitrogen removal of the system, but also improves the effective utilization rate of agricultural waste;

[0059] In addition, the brick slag has a porous structure, which can provide attachment points for microorganisms and effectively adsorb pollutants, increasing the adsorption capacity of the wetland system for pollutants, especially heavy metals, phosphates, and ammonia nitrogen. Oyster shells are rich in calcium carbonate, which can adjust the pH value of the water body and help adsorb phosphorus in the water. Brick slag and oyster shells provide a good habitat for wetland microorganisms and increase the diversity of microbial populations.

[0060] The cover plate 122 prevents the carbon source from contacting oxygen and avoids the influence of direct sunlight and temperature on the carbon source.

[0061] Reed 181 has strong pollution resistance and developed root systems, which can effectively treat high concentrations of organic matter and pollutants in the influent. Its root system can provide more attachment points for denitrifying bacteria and has strong oxygen transport capacity, which helps to provide assistance for the preliminary purification of the water body.

[0062] Canna 182 not only has good ornamental value but also has strong absorption capacity for nitrogen, phosphorus, and other nutrients, making it suitable for planting in the ceramsite area after the water quality has been treated, further purifying the water quality. Canna 182 has shallow roots and is suitable for arrangement in the middle and shallow layers.

[0063] Acorus calamus 183 has strong adaptability and can grow well in areas with high mineral content, making it particularly suitable for planting in areas with adsorption capacity such as brick slag or zeolite. These areas are usually where plants 18 are needed to further absorb nitrogen and phosphorus after some pollutants have been treated.

[0064] Iris 184 is a plant 18 that is very suitable for wetland environments and has strong absorption capacity for nitrogen and phosphorus in water. Its rhizome can provide a good living environment for microorganisms on oyster shells, especially in the treatment terminal, which can help further purify the water body.

[0065] In summary, this scheme maintains sufficient carbon sources in the wetland system and applies agricultural waste to the water treatment wetland system, improving the utilization rate of agricultural waste and increasing the water treatment capacity of the wetland system.

[0066] Example 2

[0067] Reference Figures 2-7The embodiment is different from the embodiment 1 in that the water inlet collecting area 11 is provided with an opening assembly 3 for opening the cover plate 122, the storage tube 121 is provided with a discharging assembly 4 for pushing the agricultural waste out of the storage tube 121, and the storage tube 121 is provided with a hole sealing assembly 5 for sealing the first water passing hole 1211.

[0068] As Figure 2 and Figure 3 The opening assembly 3 includes a walking track 31, the walking track 31 is arranged on the top of the water inlet collecting area 11, and the walking track 31 is arranged on the side of the water inlet collecting area 11 away from the ceramsite type wetland unit 13, the water inlet pipe 111 is located below the walking track 31, a plurality of storage tubes 121 are arranged in parallel with the walking track 31, and the storage tubes 121 are located between the walking track 31 and the ceramsite type wetland unit 13, a sliding groove 311 is arranged in the walking track 31, the sliding groove 311 penetrates to the side of the walking track 31 facing the cover plate 122, a baffle 312 is arranged on the side of the sliding groove 311 close to the cover plate 122, the cover plate 122 is connected with a limiting plate 313, the cover plate 122 passes through the baffle 312 and extends into the sliding groove 311, the limiting plate 313 is located in the sliding groove 311, adjacent limiting plates 313 abut each other, a plurality of limiting plates 313 are jointly spliced, and the two limiting plates 313 located at the outermost sides abut the two inner side walls of the sliding groove 311 respectively, when the cover plate 122 covers the storage tube 121, the limiting plate 313 abuts the baffle 312, and a plurality of pull-out grooves 1212 are arranged on the top surface of each cover plate 122, and the pull-out grooves 1212 are arranged at equal intervals.

[0069] The staff can stand on the walking track 31, then hold the pull-out grooves 1212 with hands, and gradually push the cover plate 122 into the sliding groove 311, so as to separate the cover plate 122 from the storage tube 121, when it is needed to cover the cover plate 122 again, the staff only needs to hold the pull-out grooves 1212 and push the cover plate 122 out of the sliding groove 311 again until the limiting plate 313 abuts the baffle 312, so as to realize that the cover plate 122 covers the storage tube 121 again.

[0070] As Figure 5 and Figure 7The sealing assembly 5 comprises an inner nest 51 located in the receiving tube 121, a sealing space is left between the outer side wall of the inner nest 51 and the inner side wall of the receiving tube 121, the inner nest 51 is connected with the receiving tube 121 through two connecting plates 52, the two connecting plates 52 are arranged along the arrangement direction of the receiving tube 121 and divide the sealing space into two parts which are symmetrically arranged about the horizontal center line of the connecting plate 52, the agricultural waste and the discharging assembly 4 are located in the inner nest 51, and the sealing plate 53 is inserted into the sealing space between the outer side wall of the inner nest 51 and the inner side wall of the receiving tube 121 before the agricultural waste is pushed out, the sealing plate 53 is matched with the sealing space, and the inner nest 51 is provided with a plurality of second water holes 511.

[0071] Water can pass through the receiving tube 121 and the inner nest 51 through the first water hole 1211 and the second water hole 511, and the sealing plate 53 is inserted into the sealing space before the agricultural waste is discharged, so that water is effectively prevented from flowing into the inner nest 51.

[0072] As Figure 4 , Figure 5 and Figure 6 , the discharging assembly 4 comprises a mounting frame 41 located at the bottom of the inner nest 51, the mounting frame 41 is rotationally connected with a rotating disc 42, the rotating disc 42 is driven by a driving member 43, the mounting frame 41 is hingedly connected with a plurality of first connecting rods 44, each first connecting rod 44 is connected with the rotating disc 42 through a linkage member 45, the plurality of first connecting rods 44 are hingedly connected with a second connecting rod 46, the middle portions of the plurality of second connecting rods 46 are hingedly connected with a connecting ring 47, one end of each of the plurality of second connecting rods 46 away from the rotating disc 42 is hingedly connected with another second connecting rod 46, and the mounting frame 41 is stacked with a plurality of connecting rings 47 in sequence, each connecting ring 47 is connected with a plurality of second connecting rods 46, adjacent second connecting rods 46 are hingedly connected with each other, the plurality of second connecting rods 46 away from the rotating disc 42 are connected with a third connecting rod 48, and all the third connecting rods 48 are hingedly connected with a push plate 49, the push plate 49 is attached to the inner wall of the inner nest 51, when the rotating disc 42 rotates, the driving member 43 drives the first connecting rod 44 to swing, the first connecting rod 44 drives the second connecting rod 46 to swing, and the second connecting rod 46 drives the third connecting rod 48 to swing, so that the connecting ring 47 and the push plate 49 are synchronously lifted and lowered;

[0073] When the first connecting rod 44 swings towards the inner side wall of the inner nest 51, the push plate 49 gradually rises and gradually pushes the agricultural waste out of the receiving tube 121;

[0074] When the first connecting rod 44 swings away from the inner side wall of the inner nest 51, the push plate 49 gradually descends.

[0075] The driving member 43 comprises a driving shaft 431 penetrating through all the receiving tubes 121, the connecting plate 52 and the inner nest 51, one end of the driving shaft 431 is connected with a motor 432, a first bevel gear 433 is arranged in each receiving tube 121 and coaxially fixed on the driving shaft 431, a second bevel gear 434 is coaxially fixed on the rotating disc 42, the first bevel gear 433 and the second bevel gear 434 are located in the inner nest 51, and the first bevel gear 433 is engaged with the corresponding second bevel gear 434;

[0076] The connecting member 45 comprises a spur gear 451 rotationally connected to the mounting frame 41, the spur gear 451 corresponds to the first connecting rod 44 in one-to-one manner, the rotating disc 42 is provided with an outer ring gear 452 in the circumferential direction, the spur gear 451 is engaged with the outer ring gear 452, the spur gear 451 is coaxially connected with a third bevel gear 453, the first connecting rod 44 is provided with a fourth bevel gear 454, the fourth bevel gear 454 is engaged with the third bevel gear 453, the central axis of the fourth bevel gear 454 is located on a horizontal plane, and the central axis of the fourth bevel gear 454 and the central axis of the rotating disc 42 are not intersected with each other. Before the push plate 49 pushes the materials, all the second water holes 511 are located above the push plate 49.

[0077] When the materials are discharged, the outer ring gear 452 drives the spur gear 451 and the third bevel gear 453 to rotate synchronously, the third bevel gear 453 drives the fourth bevel gear 454 to rotate, so that the rotating disc 42 drives the first connecting rod 44 to swing when rotating, the second connecting rod 46 and the third connecting rod 48 are simultaneously swung to drive the connecting ring 47 and the push plate 49 to be synchronously pushed upward, the push plate 49 gradually pushes the agricultural waste out of the receiving tube 121, until the push plate 49 is located at the opening of the receiving tube 121, at this time, the staff can stand on the walking trestle 31 and the push plate 49, and the agricultural waste is conveniently cleaned;

[0078] After the agricultural waste is cleaned, the motor 432 drives the rotating disc 42 to rotate in the opposite direction, so that the first connecting rod 44, the second connecting rod 46 and the third connecting rod 48 swing to be in a folded state, at this time, the connecting ring 47 and the push plate 49 are located at the bottom of the receiving tube 121 again, so that the staff can conveniently add new agricultural waste into the receiving tube 121.

[0079] The implementation principle of the embodiment 2 is that the agricultural waste is usually replaced within 3-6 months to ensure that sufficient carbon source is provided for the water body, when the agricultural waste is replaced, the cover plate 122 is separated from the storage pipe 121 by using the opening assembly 3, then the hole sealing assembly 5 is installed to avoid damage caused by the discharge assembly 4 being soaked in water during the discharging process, then the discharge assembly 4 is started to push the agricultural waste out of the storage pipe 121, the discharged agricultural waste is collected, then the discharge assembly 4 is reset, new agricultural waste is put into the storage pipe 121, finally the hole sealing assembly 5 is taken out, and the cover plate 122 is reinstalled, so that the replacement of the agricultural waste is facilitated.

[0080] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A horizontal subsurface flow constructed wetland system with a dosable agricultural biomass carbon source, characterized in that: The application relates to a water purification device, which comprises a water inlet collecting area (11), a carbon source adding unit (12) arranged in the water inlet collecting area (11), a ceramic type wetland unit (13) connected with the water inlet collecting area (11), a brick slag type wetland unit (14) connected with the ceramic type wetland unit (13), a zeolite type wetland unit (15) connected with the brick slag type wetland unit (14), an oyster shell type wetland unit (16) connected with the zeolite type wetland unit (15), a water outlet collecting area (17) connected with the oyster shell type wetland unit (16), plants (18) planted on the ceramic type wetland unit (13), the brick slag type wetland unit (14), the zeolite type wetland unit (15) and the oyster shell type wetland unit (16), water passing assemblies (2) arranged between the water inlet collecting area (11) and the ceramic type wetland unit (13), between the ceramic type wetland unit (13) and the brick slag type wetland unit (14), between the brick slag type wetland unit (14) and the zeolite type wetland unit (15), between the zeolite type wetland unit (15) and the oyster shell type wetland unit (16), and between the oyster shell type wetland unit (16) and the water outlet collecting area (17), agricultural wastes are arranged in the carbon source adding unit (12), and water in the water inlet collecting area (11) enters the ceramic type wetland unit (13) through the carbon source adding unit (12) and the water passing assemblies (2). The carbon source adding unit (12) comprises a plurality of receiving tubes (121), the receiving tubes (121) are used for containing agricultural wastes, and a plurality of first water passing holes (1211) are formed in the receiving tubes (121). A cover plate (122) covers each receiving tube (121), an opening assembly (3) for opening the cover plate (122) is arranged on the water inlet collecting area (11), a discharging assembly (4) for pushing agricultural wastes out of the receiving tubes (121) is arranged in the receiving tubes (121), and a hole sealing assembly (5) for sealing the first water passing holes (1211) is arranged in the receiving tubes (121). The discharge assembly (4) comprises a mounting frame (41), a rotating disc (42) is rotatably connected to the mounting frame (41), the rotating disc (42) is driven by a driving member (43), the mounting frame (41) is hingedly connected with a plurality of first connecting rods (44), each first connecting rod (44) is connected with the rotating disc (42) through a connecting member (45), each first connecting rod (44) is hingedly connected with a second connecting rod (46), the middle portions of a plurality of second connecting rods (46) are commonly hingedly connected with a connecting ring (47), one end of each second connecting rod (46) is hingedly connected with another second connecting rod (46), and the above is sequentially repeated, a plurality of connecting rings (47) are stacked above the mounting frame (41), each connecting ring (47) is connected with a plurality of second connecting rods (46), adjacent second connecting rods (46) are hingedly connected with each other, and a plurality of second connecting rods (46) away from the rotating disc (42) are connected with third connecting rods (48), and all third connecting rods (48) are commonly hingedly connected with a push plate (49), when the rotating disc (42) rotates, the driving member (43) drives the first connecting rods (44) to swing. 2.The horizontal subsurface flow constructed wetland system with injectable agricultural biomass carbon source of claim 1, wherein: The storage tubes (121) are square tubes, adjacent storage tubes (121) are spliced with each other, and adjacent cover plates (122) are spliced with each other.

3. The injectable agricultural biomass carbon source horizontal subsurface flow constructed wetland system according to claim 1, characterized in that: The ceramic particle type wetland unit (13) has ceramic particle particle sizes of 5-10 mm, the brick slag type wetland unit (14) has brick slag particle sizes of 10-20 mm, the zeolite type wetland unit (15) has zeolite particle sizes of 8-16 mm, and the oyster shell type wetland unit (16) has oyster shell particle sizes of 20-30 mm; the water passing assembly (2) is a plurality of perforated water distribution pipes (21).

4. The injectable agricultural biomass carbon source horizontal subsurface flow constructed wetland system according to claim 1, characterized in that: The plants (18) include reeds (181), canes (182), calamus (183) and irises (184), the reeds (181) and the canes (182) are planted on the ceramic particle type wetland unit (13), the calamus (183) is planted on the brick slag type wetland unit (14) and the zeolite type wetland unit (15), and the irises (184) are planted on the oyster shell type wetland unit (16).

5. The injectable agricultural biomass carbon source horizontal subsurface flow constructed wetland system according to claim 1, characterized in that: The opening assembly (3) comprises a walking stack (31) arranged on the top of the water inlet collecting area (11), a sliding groove (311) is arranged in the walking stack (31), the sliding groove (311) penetrates to the side of the walking stack (31) facing the cover plate (122), the sliding groove (311) is provided with a baffle (312) near the side of the cover plate (122), the cover plate (122) is connected with a limiting plate (313), the cover plate (122) penetrates through the baffle (312) and extends into the sliding groove (311), the limiting plate (313) is located in the sliding groove (311), when the cover plate (122) covers the storage pipe (121), the limiting plate (313) abuts against the baffle (312), a plurality of pull-out grooves (1212) are arranged on each cover plate (122).

6. The injectable agricultural biomass carbon source horizontal subsurface flow constructed wetland system according to claim 1, characterized in that: The driving member (43) comprises a driving shaft (431), one end of the driving shaft (431) is connected with a motor (432), a first bevel gear (433) is arranged in each storage pipe (121), the first bevel gear (433) is coaxially fixed on the driving shaft (431), the rotating disc (42) is coaxially fixed with a second bevel gear (434), the first bevel gear (433) is engaged with the corresponding second bevel gear (434); The connecting member (45) comprises a spur gear (451), the spur gear (451) is rotatably connected to the mounting frame (41), the spur gear (451) corresponds to the first connecting rod (44) in one-to-one manner, the rotating disc (42) is circumferentially provided with an external gear ring (452), the spur gear (451) is engaged with the external gear ring (452), the spur gear (451) is coaxially connected with a third bevel gear (453), the first connecting rod (44) is provided with a fourth bevel gear (454), the fourth bevel gear (454) is engaged with the third bevel gear (453).

7. The carbon source for agricultural biomass throw-in horizontal subsurface constructed wetland system according to claim 6, characterized in that: The hole sealing assembly (5) comprises an inner nest (51) located in the receiving tube (121), a sealing space is left between the outer side wall of the inner nest (51) and the inner side wall of the receiving tube (121), the inner nest (51) is connected with the receiving tube (121) through a connecting plate (52), the driving shaft (431) penetrates through the receiving tube (121), the connecting plate (52) and the inner nest (51), the agricultural waste, the mounting frame (41) and the push plate (49) are all located in the inner nest (51), the sealing plate (53) is inserted between the outer side wall of the inner nest (51) and the inner side wall of the receiving tube (121), the push plate (49) is matched with the inner nest (51), a plurality of second water through holes (511) are formed in the circumferential surface of the inner nest (51), all the second water through holes (511) are located above the push plate (49) before the push plate (49) pushes the materials.

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