River water body ecological restoration and purification system

Abstract

The present application relates to a kind of river water body ecological restoration purification systems, including the flocculating agent adding system, gravel bed purification system and artificial ecological floating island system being sequentially arranged from the upstream to the downstream of river channel;Flocculating agent adding system includes truss;Lifting stand is arranged below horizontal frame, and lifting stand can move up and down relative to horizontal frame;Flocculating agent adding unit, it is spaced apart to be provided with several along the extension direction of lifting stand, to add flocculating agent when moving down in river channel by lifting stand;Gravel bed purification system, including the gravel bed being laid in the bottom of river channel and the purification tank being arranged in the side of gravel bed;Artificial ecological floating island system, including a plurality of floating units spliced, floating unit includes the floating plate being fixed relative to river bank, a plurality of installation grooves are formed in floating plate, and greenery pot is fixed in installation groove;Increase river sewage purification effect, increase pollutant removal capacity, form integrated technical system of city water environment and pollutant control.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water ecological management, and particularly relates to a river water body ecological restoration and purification system. BACKGROUND

[0002] The acceleration of urbanization process exerts stress on river ecological system, brings serious challenges to river managers, and the huge economic value-added value of waterfront areas makes the ecological restoration of urban rivers and the construction of water landscape a hot spot. Therefore, by implementing river dredging, low-pollution water purification, river beach construction, and waterfront landscape ecological corridor construction, the physical connection of water and soil is restored to lay a foundation for the benign circulation of the ecological system.

[0003] Urban river ecological restoration is the most popular research content of river ecological restoration at home and abroad. Through the regulation of urban rivers, these cities form ecological axes of the city, greatly improve the urban environment, and produce good ecological and social benefits. At the same time, these successful management experiences provide a reference for the management and construction mode of other urban rivers.

[0004] At present, the research on urban water ecological system at home and abroad is still not perfect, and the main problems are: (1) no systematic research system of urban water ecological system is formed; (2) lack of water ecological system construction mode coordinated with nature, human and water; resulting in unsatisfactory river ecological management effect. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a river water body ecological restoration and purification system to solve the technical problem of unsatisfactory river ecological management effect caused by the lack of systematic research system of river ecological system in the prior art.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by a river water body ecological restoration and purification system of the present application is:

[0007] A river water body ecological restoration and purification system comprises:

[0008] A flocculant adding system, a gravel bed purification system and an artificial ecological floating island system are arranged in sequence from the upstream to the downstream of the river.

[0009] The flocculant adding system comprises a truss erected on the river, and the truss comprises a horizontal frame extending along the width direction of the river, and support columns vertically arranged on the left and right sides of the horizontal frame.

[0010] The lifting frame is arranged below the horizontal frame, and the lifting frame can move up and down relative to the horizontal frame.

[0011] The flocculant adding units are arranged at intervals along the extension direction of the lifting frame, so as to add flocculants into the river channel when the lifting frame moves downward;

[0012] The gravel bed purification system comprises a gravel bed arranged on the bottom of the river channel and a purification tank arranged on one side of the gravel bed, and a water flow grid is arranged between the gravel bed and the purification tank.

[0013] The artificial ecological floating island system comprises a plurality of floating units spliced together, each floating unit comprising a floating plate fixed relative to the river bank, a plurality of installation grooves being formed in the floating plate, and a plurality of green plant pots being fixed in the installation grooves, the installation grooves being through from top to bottom so that the bottom of each green plant pot can be in contact with the water in the river channel after the green plant pot is fixed in the installation groove.

[0014] Beneficial effects: The flocculants are added into the upstream of the river by the flocculant adding system, so that the suspended solid particles in the contaminated water in the upstream are partially removed by free settling and flocculation precipitation; after the suspended solids are precipitated by the flocculants, the water is subjected to physical and chemical purification and biological purification by the gravel bed purification system, the gaps between the gravels have a filtering effect on the suspended particles in the water, the fine particles retained in the pores of the gravels have adsorption capacity and indirectly remove part of the phosphates in the water, microorganisms gradually grow on the surface of the gravels to form a biofilm, which can promote the decomposition of organic matter in the water, the roots of the plants in the green plant pots in the artificial ecological floating island system penetrate into the water to absorb nutrients such as nitrogen and phosphorus, and also provide habitats and breeding sites for some microorganisms and aquatic organisms, so as to remove the pollutants such as nitrogen and phosphorus in the contaminated water through the absorption of the pollutants by the plant roots and the oxidation and degradation of the pollutants by the microorganisms; the combination of the flocculant adding system, the gravel bed purification system and the artificial ecological floating island system in the river increases the purification effect of the river water and the pollutant removal capacity, and forms an integrated technical system for urban water environment and pollutant control.

[0015] Further, the lifting frame comprises an upper frame body, a lower frame body and guide rods fixed between the upper frame body and the lower frame body, the flocculant adding unit comprises an outer sleeve fixed to the lower frame body and an inner sleeve sleeved in the outer sleeve, a sliding frame is slidingly arranged between the two guide rods, the upper end of the inner sleeve is fixedly connected with the sliding frame, an extension structure is arranged between the lower frame body and the sliding frame, a stirring structure is arranged between the lower end of the outer sleeve and the lower end of the inner sleeve, the extension structure drives the inner sleeve to move up and down relative to the outer sleeve so that the stirring structure extends and retracts along the radial direction of the outer sleeve to stir the water; a conveying hose is fixed in the inner sleeve, the conveying hose is in communication with a flocculant storage tank fixed to the lifting frame, an outlet structure is formed in the lower side wall of the inner sleeve, and a discharge hole is formed in the conveying hose at a position corresponding to the outlet structure.

[0016] Beneficial effects: The flocculant adding unit can be deep into the water body when the lifting frame is lifted relative to the river, the inner sleeve of the flocculant adding unit is fixed with a conveying hose communicated with the flocculant storage tank, so that the flocculant can be discharged from the lower part of the inner sleeve, at the same time, the stirring structure is arranged between the lower end of the outer sleeve and the lower end of the inner sleeve, so that after the flocculant is discharged from the lower part of the inner sleeve, the stirring structure can stir the flocculant in the water body, so that the flocculant can be more evenly diffused in the water body.

[0017] Further, the stirring structure includes a plurality of groups of stirring assemblies arranged radially along the outer sleeve, the stirring assembly includes a first connecting rod hinged to the lower end of the outer sleeve and a second connecting rod hinged to the lower end of the inner sleeve, and the end of the first connecting rod away from the outer sleeve is hingedly connected to the end of the second connecting rod away from the inner sleeve.

[0018] Beneficial effects: The stirring structure can realize stirring in the water body when the inner sleeve moves up and down relative to the outer sleeve.

[0019] Further, in the up-down direction, the outlet structure is arranged below the outer sleeve, the outlet structure includes a discharge port opened in the side wall of the inner sleeve and a cylindrical barrel fixed to the side wall of the inner sleeve corresponding to the discharge port, the side wall of the cylindrical barrel is provided with a circular hole, and a cylindrical cover is slidably arranged outside the cylindrical barrel to realize the blocking and opening of the circular hole in the side wall of the cylindrical barrel by moving the cylindrical cover relative to the cylindrical barrel.

[0020] Beneficial effects: The arrangement of the outlet structure can push the cylindrical cover away from the cylindrical barrel when the flocculant flows out of the inner sleeve, so that the circular hole is opened for the flocculant to flow out, and when the flocculant does not need to be added, the cylindrical cover can be buckled to the cylindrical barrel under the extrusion of the water body, so that the cylindrical cover blocks the circular hole in the side wall of the cylindrical barrel to prevent the water from entering the inner sleeve.

[0021] Further, the cylindrical barrel is slidably sealed with a cylindrical plate, the cylindrical plate and the cylindrical cover are connected by a transmission rod, the bottom of the cylindrical barrel is provided with a guide hole for the transmission rod to pass through, the spring is connected between the bottom of the cylindrical barrel and the bottom of the cylindrical cover, and the inner side wall of the cylindrical cover is slidably sealed with the outer side wall of the cylindrical barrel; in the natural state, the spring is contracted under the extrusion of the water body, and the side wall of the cylindrical cover blocks the circular hole in the side wall of the cylindrical barrel; when the flocculant is discharged, the cylindrical plate is pressed by the flocculant, the cylindrical plate presses the cylindrical cover through the transmission rod, the spring is elongated, the side wall of the cylindrical cover moves outward along the radial direction of the inner sleeve, and the circular hole is exposed.

[0022] Beneficial effect: Ensure that the relative movement between the cylinder and the cylinder cover is more smooth, and the cylinder cover can move relative to the cylinder when the flocculating agent flows out, so that the round hole is exposed, and when the flocculating agent does not need to be added, the cylinder cover is pressed by the water body to make the cylinder cover cover the cylinder, and the round hole is blocked.

[0023] The conveying hose is provided with a fixed sealing structure between the upper and lower parts of the discharge hole and the inner sleeve.

[0024] Beneficial effect: In the inner cavity formed by the conveying hose and the inner sleeve, a discharge buffer cavity for flocculating agent is formed between the upper part of the discharge hole and the lower part of the discharge hole through the arrangement of the sealing structure, which can facilitate the conveying of the flocculating agent from the conveying hose to the outside of the inner sleeve. In addition, the arrangement of the fixed sealing structure also enables the stable fixed connection of the conveying hose relative to the inner sleeve.

[0025] The gravel bed is sequentially provided with a gravel layer, a broken stone layer and a sandstone layer from bottom to top. A downwardly recessed aeration groove is arranged on the river bottom below the gravel bed, and an aeration pipe is arranged in the aeration groove, and the aeration pipe is provided with a gas discharge hole for conveying gas to the bottom of the gravel bed.

[0026] Beneficial effect: The arrangement of the aeration groove and the aeration pipe can effectively remove nitrogen, phosphorus and difficult-to-degrade pollutants in the ecological gravel bed process. The arrangement of the aeration groove can effectively support the gravel, thereby avoiding the direct pressing of the gravel on the aeration pipe to form blockage of the aeration pipe.

[0027] Further, the gravel bed purification system comprises an overflow wall arranged at intervals with the water flow grid, and the overflow wall and the water flow grid form the purification tank therebetween, and the overflow wall has the same height as the water flow grid.

[0028] Beneficial effect: The water flow grid can filter the water flowing through the gravel bed purification system, and the filtered water flows through the water flow grid into the purification tank. Since the purification tank comprises the overflow wall arranged at intervals with the water flow grid, when the water flow height overflows the overflow wall, the water flow flows out of the purification tank, so that the water flow is subjected to sedimentation and purification in the purification tank.

[0029] Further, the floating unit comprises two rows of mounting grooves, and a through hole extending in the left-right direction is arranged between the two rows of mounting grooves, a connecting rod is arranged in the through hole, and the two ends of the connecting rod are fixed to the river bank by ropes.

[0030] Beneficial effect: The arrangement of the connecting rod can increase the structural strength of the floating unit and increase the strength of the floating unit against water flow impact. Furthermore, the arrangement of the connecting rod facilitates the fixation of the floating unit to the river bank by ropes.

[0031] Further, the installation slot is a through slot structure with a large upper part and a small lower part, and the lower part of the green plant pot is fixed with at least two elastic hooks, the elastic hook body opening faces the outer side of the green plant pot, and when the green plant pot is placed in the installation slot, the elastic hooks are respectively hooked on the bottom surface of the floating unit.

[0032] Beneficial effects: the structure of the installation slot can facilitate the placement of the green plant pot, and the elastic hooks of the green plant pot increase the connection between the green plant pot and the floating unit, so that the water flow cannot wash out the floating pot from the installation slot. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structure schematic view of a flocculant adding system in a river water body ecological restoration and purification system of the present application;

[0034] Figure 2 is Figure 1 a structure schematic view of a flocculant adding unit of the flocculant adding system;

[0035] Figure 3 is Figure 2 a structure schematic view of the outlet structure of the flocculant adding unit in an open state;

[0036] Figure 4 is Figure 2 a structure schematic view of the outlet structure of the flocculant adding unit in a closed state;

[0037] Figure 5 is a structure schematic view of a gravel bed purification system in a river water body ecological restoration and purification system of the present application;

[0038] Figure 6 is Figure 5 a side view of the gravel bed purification system;

[0039] Figure 7 is a structure schematic view of an artificial ecological floating island system in a river water body ecological restoration and purification system of the present application;

[0040] Figure 8 is Figure 7 a structure schematic view of a floating unit of the artificial ecological floating island system;

[0041] Figure 9 is Figure 8 a transverse sectional view;

[0042] Figure 10 is Figure 7 a structure schematic view of a green plant pot of the artificial ecological floating island system.

[0043] Reference signs: 1-truss; 2-support column; 3-guardrail; 4-guide rod; 5-upper frame body; 6-sliding frame; 7-flocculant storage tank; 8-lower frame body; 9-outer sleeve; 10-inner sleeve; 11-conveying hose; 12-discharge hole; 13-fixed sealing structure; 14-first connecting rod; 15-second connecting rod; 16-outlet structure; 17-discharge outlet; 18-cylindrical cylinder; 19-round hole; 20-cylindrical cover; 21-circular plate; 22-transmission rod; 23-spring; 24-gravel layer; 25-stone layer; 26-sand layer; 27-aeration tank; 28-aeration pipe; 29-water flow grid; 30-overflow wall; 31-floating unit; 32-connecting rod; 33-mounting groove; 34-plant pot; 35-elastic hook. DETAILED DESCRIPTION

[0044] A river water body ecological restoration and purification system according to the present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0045] As shown in the drawings, Figures 1-10 A river water body ecological restoration and purification system according to the present application comprises, from upstream to downstream of the river, a flocculant adding system, a gravel bed purification system, and an artificial ecological floating island system. The flocculant adding system comprises a truss 1 erected on the river, the truss 1 comprising a horizontal frame extending along the width direction of the river, and support columns 2 vertically arranged on the left and right sides of the horizontal frame. In this embodiment, the lower ends of the support columns 2 are fixed to the riverbank, a pedestrian walkway is arranged on the horizontal frame, and guardrails 3 are arranged on both sides of the pedestrian walkway. A lifting frame is arranged below the horizontal frame, which can move up and down relative to the horizontal frame. A plurality of flocculant adding units are arranged at intervals in the extension direction of the lifting frame, so that when the lifting frame moves downward, the flocculant adding units extend into the river to add flocculants.

[0046] Specifically, the lifting frame comprises an upper frame body 5, a lower frame body 8, and a guide rod 4 fixed between the upper frame body 5 and the lower frame body 8, which extends in the up-down direction; the flocculant adding unit comprises an outer sleeve 9 fixed to the lower frame body 8 and an inner sleeve 10 sleeved in the outer sleeve 9, each flocculant adding unit corresponds to two guide rods 4, and a sliding frame 6 is slidingly arranged between the two guide rods 4, the upper end of the inner sleeve 10 is fixedly connected with the sliding frame 6, and a telescopic structure extending in the up-down direction is arranged between the lower frame body 8 and the sliding frame 6. In this embodiment, the telescopic structure is a telescopic hydraulic cylinder, which can extend and retract in the up-down direction, thereby jacking up the sliding frame 6 relative to the guide rod 4, so as to realize the upward movement of the inner sleeve 10 relative to the outer sleeve 9.

[0047] The lifting frame is fixed with a flocculant storage tank 7, and the inner sleeve 10 is fixed with a conveying hose 11 which is in communication with the flocculant storage tank 7. The conveying hose 11 is connected with a pump body, and the lower part of the conveying hose 11 is provided with a discharge hole 12. The lower part of the side wall of the inner sleeve 10 is provided with an outlet structure 16, and the discharge hole 12 is correspondingly arranged with the outlet structure 16. In this embodiment, in order to facilitate the fixation of the conveying hose 11 and the inner sleeve 10, a fixed sealing structure 13 is arranged in the cavity formed by the inner sleeve 10 and the conveying hose 11. In this embodiment, the fixed sealing structure 13 is a sealing ring fixed in the inner sleeve 10, and the outer circumferential surface of the sealing ring is sealingly and fixedly connected with the inner sleeve 10, and the inner circumferential surface of the sealing ring is sealingly and fixedly connected with the conveying hose 11. The conveying hose 11 is arranged as a length-adjustable bellows at the connection position with the flocculant storage tank 7.

[0048] In this embodiment, in the up-down direction, the outlet structure 16 is arranged below the outer sleeve 9. The outlet structure 16 includes a discharge port 17 arranged in the side wall of the inner sleeve 10 and a cylindrical barrel 18 fixed to the side wall of the inner sleeve 10 and corresponding to the discharge port 17. The side wall of the cylindrical barrel 18 is provided with a circular hole 19, and a cylindrical cover 20 is slidingly arranged outside the cylindrical barrel 18, so that the circular hole 19 of the side wall of the cylindrical barrel 18 is covered or opened by moving the cylindrical cover 20 relative to the cylindrical barrel 18. Specifically, a circular plate 21 is slidingly and sealingly arranged in the cylindrical barrel 18. The circular plate 21 is connected with the cylindrical cover 20 through a transmission rod 22. The bottom of the cylindrical barrel 18 is provided with a guide hole through which the transmission rod 22 passes. The bottom of the cylindrical barrel 18 and the bottom of the cylindrical cover 20 are connected with a spring 33. The inner side wall of the cylindrical cover 20 is slidingly and sealingly connected with the outer side wall of the cylindrical barrel 18, that is, the annular inner wall surface of the cylindrical cover 20 is slidingly and sealingly connected with the annular outer wall surface of the cylindrical barrel 18. In the natural state, as shown in the figure, the water body extrudes the cylindrical cover 20, the spring 33 is contracted, the cylindrical cover 20 slides relative to the cylindrical barrel 18, the side wall of the cylindrical cover 20 blocks the circular hole 19 of the side wall of the cylindrical barrel 18, and the water body is prevented from entering the inner sleeve 10 from the circular hole 19. Figure 4 When the flocculant is discharged, as shown in the figure, the flocculant presses the circular plate 21 in the cylindrical barrel 18, the circular plate 21 presses the cylindrical cover 20 through the transmission rod 22, the spring 33 is elongated, the side wall of the cylindrical cover 20 moves outward along the radial direction of the inner sleeve 10, the circular hole 19 is exposed, and the flocculant flows out. Figure 3

[0049] ​In order to facilitate the stirring of the flocculant in the inflow water body, in the embodiment, a stirring structure is arranged between the lower end of the outer sleeve 9 and the lower end of the inner sleeve 10. The telescopic structure drives the inner sleeve 10 to move up and down relative to the outer sleeve 9 to make the stirring structure stretch and retract along the outer sleeve 9 in the radial direction to realize water body stirring. Specifically, the stirring structure includes a plurality of groups of stirring assemblies arranged uniformly in the radial direction of the outer sleeve 9. The stirring assembly includes a first connecting rod 14 hinged at the lower end of the outer sleeve 9 and a second connecting rod 15 hinged at the lower end of the inner sleeve 10. The end of the first connecting rod 14 away from the outer sleeve 9 is hingedly connected to the end of the second connecting rod 15 away from the inner sleeve 10.

[0050] In the embodiment, the flocculant is jackfruit peel polysaccharide flocculant solution, and the preparation process includes: (1) pretreating jackfruit peel to obtain jackfruit peel powder; washing the jackfruit peel, cutting it into strips, drying it, then placing it in an oven for drying at 70°C, and crushing it to obtain the jackfruit peel powder; (2) soaking the jackfruit peel powder in anhydrous ethanol, filtering, then soaking in petroleum ether, filtering, then adding sodium hydroxide solution and adjusting the pH value of the solution. The solid-liquid ratio of the powder to the sodium hydroxide is 1:50, and the pH value of the solution ranges from 7 to 9; (3) after water bath heating and stirring for a certain time under certain temperature conditions, filtering to obtain the jackfruit peel polysaccharide flocculant solution. The water bath temperature is 70-80°C, and the extraction time is 50-60 min. The mixed solution is filtered with 8 layers of gauze and a 300-mesh screen in sequence.

[0051] The upstream of the river is added with flocculants through the flocculant adding system, so that the suspended solid particles in the polluted water body in the upstream are partially removed by free settling and flocculation precipitation.

[0052] After the water body is added with flocculants through the flocculant adding system, the water body passes through the gravel bed purification system. The gravel bed purification system includes a gravel bed laid on the bottom of the river and a purification tank arranged on one side of the gravel bed. A water flow grid 29 is arranged between the gravel bed and the purification tank. Specifically, the gravel bed includes, from bottom to top, a gravel layer 24, a broken stone layer 25, and a sandstone layer 26. The diameters of the gravels gradually decrease from bottom to top. The gaps between the gravels have a filtering effect on the suspended particles in the water. The fine particles trapped in the pores of the stones have adsorption capacity and indirectly remove part of the phosphates in the water. Microorganisms gradually grow on the surface of the stones to form a biofilm, which can promote the decomposition of organic matter in the water.

[0053] A downwardly recessed aeration tank 27 is arranged on the riverbed below the gravel bed. An aeration pipe 28 is laid in the aeration tank 27, and gas discharge holes are formed in the aeration pipe 28 to deliver gas to the bottom of the gravel bed. The arrangement of the aeration tank 27 and the aeration pipe 28 can effectively remove nitrogen, phosphorus, and refractory pollutants in the ecological gravel bed process. The arrangement of the aeration tank 27 can effectively support the gravel, thereby avoiding the direct pressing of the gravel on the aeration pipe 28 to block the aeration pipe 28.

[0054] The gravel bed purification system comprises an overflow wall 30 arranged apart from the water flow grid 29, and a purification tank is formed between the overflow wall 30 and the water flow grid 29, and the overflow wall 30 has the same height as the water flow grid 29. The water flow grid 29 is capable of allowing water filtered by the gravel bed purification system to pass through, and the filtered water passes through the water flow grid 29 and enters the purification tank. Since the purification tank comprises the overflow wall 30 arranged apart from the water flow grid 29, when the water flow height overflows the overflow wall 30, the water flow flows out of the purification tank, so that the water flow is subjected to sedimentation and purification in the purification tank, thereby achieving the purpose of further purifying the water body.

[0055] The water body purified by the gravel bed purification system flows through the artificial ecological floating island system. The artificial ecological floating island system comprises a plurality of floating units 31 spliced together. The floating unit 31 comprises a floating plate fixed relative to the river bank. A plurality of installation grooves 33 are formed in the floating plate. A green plant pot 34 is fixed in each installation groove 33. The installation grooves 33 are through-penetrating from top to bottom, so that the root system of the green plant in the green plant pot 34 can be in contact with the water body in the river channel after the green plant pot 34 is fixed in the installation groove 33.

[0056] Specifically, the floating unit 31 comprises two rows of installation grooves 33. A through hole extending in the left-right direction is arranged between the two rows of installation grooves 33. A connecting rod 32 is arranged in the through hole. The two ends of the connecting rod 32 are fixed to the river bank by ropes. The arrangement of the connecting rod 32 can increase the structural strength of the floating unit 31 and increase the strength of the floating unit 31 against the impact of the water flow. In addition, the arrangement of the connecting rod 32 facilitates the fixation of the floating unit 31 to the river bank by ropes. The installation groove 33 has a through groove structure with a large upper part and a small lower part. The shape of the green plant pot 34 is adapted to the installation groove 33. At least two elastic hooks 35 are fixed to the lower part of the green plant pot 34. The hook bodies of the elastic hooks 35 are open towards the outside of the green plant pot 34. When the green plant pot 34 is placed in the installation groove 33, the hook bodies of the elastic hooks 35 gradually come into contact with the side walls of the installation groove 33 and are deformed. Further pressing the green plant pot 34 downwards, the elastic hooks 35 extend out of the bottom of the installation groove 33, the hook bodies recover from deformation, and the hook bodies of the elastic hooks 35 are respectively hooked on the bottom surface of the floating unit 31, so as to prevent the green plant pot 34 from being washed out of the floating unit 31 under the impact of the water flow. The plants in the green plant pots 34 in the artificial ecological floating island system have their root systems penetrating into the water body, absorbing nutrients such as nitrogen and phosphorus, and providing habitats and breeding sites for some microorganisms and aquatic organisms. Under the action of the absorption of the pollutants by the plant root systems and the oxidation and degradation of the pollutants by the microorganisms, the purpose of removing the pollutants such as nitrogen and phosphorus in the polluted water body is achieved.

[0057] The present application combines the flocculant adding system, the gravel bed purification system and the artificial ecological floating island system in the river to increase the purification effect of the river sewage and the pollutant removal capacity, and forms a three-dimensional repair system for the urban water environment and the pollutant control.

[0058] In the above embodiment, the lower end of the outer sleeve and the lower end of the inner sleeve are provided with a stirring structure, and the telescopic structure drives the inner sleeve to move up and down relative to the outer sleeve to make the stirring structure expand and contract along the radial direction of the outer sleeve to realize water stirring; in other embodiments, the stirring structure can also not be provided.

[0059] In the above embodiment, the stirring structure includes a plurality of groups of stirring assemblies uniformly arranged along the radial direction of the outer sleeve, and the stirring assembly includes a first connecting rod hinged to the lower end of the outer sleeve and a second connecting rod hinged to the lower end of the inner sleeve, and the end of the first connecting rod away from the outer sleeve is hingedly connected to the end of the second connecting rod away from the inner sleeve; in other embodiments, the stirring structure can also be in other structural forms.

[0060] In the above embodiment, a downwardly recessed aeration groove is arranged at the bottom of the river below the gravel bed, an aeration pipe is arranged in the aeration groove, and exhaust holes for conveying gas to the bottom of the gravel bed are formed in the aeration pipe; in other embodiments, the downwardly recessed aeration groove can also not be arranged below the gravel bed, or only the aeration groove is arranged without the aeration pipe in the aeration groove.

[0061] In the above embodiment, the gravel bed purification system includes an overflow wall arranged at intervals with the water flow grid, and the overflow wall and the water flow grid form the purification tank therebetween, and the overflow wall and the water flow grid have the same height; in other embodiments, the purification tank can also be arranged at a relatively far distance from the gravel bed.

[0062] In the above embodiment, the floating unit includes two rows of mounting grooves; in other embodiments, the floating unit can also include three rows of mounting grooves.

[0063] In the above embodiment, through holes extending along the left-right direction are arranged between the two rows of mounting grooves, a connecting rod is arranged in the through hole, and the connecting rod is fixed to the river bank by ropes at both ends; in other embodiments, the connecting rod can also not be arranged in the through hole, and a rope is arranged in the through hole, and the rope is directly fixed to the river bank.

[0064] In the above embodiment, the mounting groove is a through groove structure with a large upper part and a small lower part, and at least two elastic hooks are fixed to the lower part of the green plant pot, the hook bodies of the elastic hooks are open towards the outer side of the green plant pot, and when the green plant pot is placed in the mounting groove, the elastic hooks are respectively hooked on the bottom surface of the floating unit; in other embodiments, the elastic hooks can also not be provided, and a counterweight is hung below the green plant pot, and the green plant pot is stably mounted relative to the mounting groove under the action of the counterweight.

Claims

1. A river water body ecological restoration and purification device, characterized in that, The application relates to a river purification system. The river purification system comprises a flocculant adding system, a gravel bed purification system and an artificial ecological floating island system arranged in sequence from the upstream to the downstream of a river channel. The flocculant adding system comprises a truss erected on the river channel, the truss comprising horizontal frames extending along the width direction of the river channel and support columns vertically arranged on the left and right sides of the horizontal frames. The lifting frame is arranged below the horizontal frame and can move up and down relative to the horizontal frame. The flocculant adding unit is arranged at intervals along the extension direction of the lifting frame to add flocculants into the river channel when the lifting frame moves downward. The gravel bed purification system comprises a gravel bed laid on the bottom of the river channel and a purification tank arranged on one side of the gravel bed, and a water flow grid is arranged between the gravel bed and the purification tank. The artificial ecological floating island system comprises a plurality of floating units spliced together, and each floating unit comprises a floating plate fixed relative to the river bank, a plurality of installation grooves are formed in the floating plate, and a plurality of green plant pots are fixed in the installation grooves. The lifting frame comprises an upper frame body, a lower frame body and guide rods fixed between the upper frame body and the lower frame body. The flocculant adding unit comprises an outer sleeve fixed on the lower frame body and an inner sleeve sleeved in the outer sleeve. Two guide rods are arranged between the upper frame body and the lower frame body. The lower end of the outer sleeve and the lower end of the inner sleeve are provided with a stirring structure. The inner sleeve is fixed with a conveying hose, and the conveying hose is in communication with a flocculant storage tank fixed on the lifting frame. The lower side wall of the inner sleeve is provided with an outlet structure, and the conveying hose is provided with an exhaust hole corresponding to the outlet structure. The stirring structure comprises a plurality of stirring assemblies arranged at intervals along the radial direction of the outer sleeve. In the up-down direction, the outlet structure is arranged below the outer sleeve. The outlet structure comprises an exhaust port formed in the side wall of the inner sleeve and a cylindrical barrel fixed on the side wall of the inner sleeve corresponding to the exhaust port. The side wall of the cylindrical barrel is provided with a circular hole, and a cylindrical cover is sleeved on the outer side of the cylindrical barrel. The movement of the cylindrical cover relative to the cylindrical barrel can shield and open the circular hole in the side wall of the cylindrical barrel. The cylindrical barrel is in sliding sealing cooperation with a circular plate, the circular plate is connected with the cylindrical cover through a transmission rod, a guide hole for the transmission rod to pass through is arranged in the bottom of the cylindrical barrel, a spring is connected between the bottom of the cylindrical barrel and the cover bottom of the cylindrical cover, the inner side wall of the cylindrical cover is in sliding sealing cooperation with the outer side wall of the cylindrical barrel; in a natural state, under the extrusion of the water body on the cylindrical cover, the spring is contracted, the side wall of the cylindrical cover blocks the circular hole of the cylindrical barrel; when the flocculant is discharged, the flocculant presses the circular plate, the circular plate presses the cylindrical cover through the transmission rod, the spring is elongated, the side wall of the cylindrical cover moves outward along the radial direction of the inner sleeve, and the circular hole is exposed. The conveying hose is provided with a fixed sealing structure between the upper and lower parts of the discharge hole and the inner sleeve.

2. The ecological restoration and purification device for river water body according to claim 1, characterized in that, The gravel bed is sequentially provided with a gravel layer, a broken stone layer and a sandstone layer from bottom to top; the river bottom below the gravel bed is provided with a downwardly recessed aeration groove, and an aeration pipe is arranged in the aeration groove and provided with a gas discharge hole for conveying gas to the bottom of the gravel bed.

3. The ecological restoration and purification device for river water body according to claim 2, characterized in that, The gravel bed purification system comprises an overflow wall arranged at intervals with the water flow grid, and the overflow wall and the water flow grid form the purification tank therebetween, and the overflow wall and the water flow grid have the same height.

4. The ecological restoration and purification device for river water body according to claim 1, characterized in that, The floating unit comprises two rows of mounting grooves, through holes extending in the left-right direction are arranged between the two rows of mounting grooves, connecting rods are arranged in the through holes, and the connecting rods are fixed on the river bank through ropes at both ends.

5. The ecological restoration and purification device for river water body according to claim 4, characterized in that, The mounting groove is a through groove structure with a large upper part and a small lower part, at least two elastic hooks are fixed to the lower part of the green plant pot, the hook bodies of the elastic hooks are open towards the outer side of the green plant pot, and when the green plant pot is placed in the mounting groove, the elastic hooks are respectively hooked on the bottom surface of the floating unit.

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