Wetland purification system based on subsurface flow wetland and surface flow wetland

Abstract

The invention provides a wetland purification system based on a subsurface flow wetland and a surface flow wetland, and relates to the technical field of sewage treatment.The wetland purification system comprises a wetland base body, planting pits and a water channel are formed in the wetland base body, a planting table is arranged in the water channel, and a communicating pipe is installed at the bottom of the water channel; a stop block and an aeration pipe network are arranged at the bottom of the planting pit, a supporting plate is embedded in the position, above the aeration pipe network, of the planting pit, and a through hole is formed in the supporting plate; stone filler is arranged on the supporting plate, and a composite rope layer is arranged on the upper side of the stone filler. One end of the composite rope layer is connected with the sand layer and the soil layer, and the other end of the composite rope layer is connected with the bottom of the planting pit, so that sewage can be sucked up through capillary action, aeration is performed in the process, the requirements of reeds on water and oxygen are met, and the reeds can be influenced by decay of the composite rope layer; more importantly, customers can prevent reed roots from pricking into lower stone fillers, and the possibility that the reed roots are killed by sewage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to a wetland purification system based on a subsurface flow wetland and a surface flow wetland. Background Art

[0002] Sewage treatment: The process of purifying sewage to meet the water quality requirements for discharging into a certain water body or reusing it. In the sewage treatment of towns, the application of subsurface flow wetlands is involved. Specifically, the subsurface flow wetland is a relatively commonly used type of constructed wetland. The subsurface flow wetland uses hydrophilic plants as surface greenery and sand and gravel soil as fillers to allow water to naturally seep and filter, creating an artificial landscape.

[0003] In existing subsurface flow wetlands, there is a technology involving combination with surface flow wetlands. For example, in the Chinese patent with the patent number 202110973778.0, its wetland purification system includes: a surface flow wetland, a subsurface flow wetland, and a sump. The sump is arranged at the bottom of the subsurface flow wetland, the sump is located inside the subsurface flow wetland, and the subsurface flow wetland is located below the surface flow wetland. This wetland purification system undergoes purification treatment through multiple granular layers. The treated sewage enters the collecting pipe, and then the treated sewage in the collecting pipe is injected onto the side of the soil layer surface far from the sump; part of the sewage can flow on the soil layer surface to the outlet pipe, and part of the sewage infiltrates into the granular layer again from the soil layer on the side close to the collecting pipe, and the granular layer purifies the sewage again, cycling in this way. It can avoid the problems of untreated sewage being directly exposed to the air, volatilizing odors, and breeding mosquitoes.

[0004] Although it has achieved the ability to avoid the problems of untreated sewage being directly exposed to the air, volatilizing odors, and breeding mosquitoes, there is still a situation where the water in the sump is too far separated from the plant roots and is unevenly distributed, which leads to a decrease in treatment efficiency. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a wetland purification system based on a subsurface flow wetland and a surface flow wetland, which solves the problem of low sewage treatment efficiency in the existing technology of combining subsurface flow wetlands and surface flow wetlands.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A wetland purification system based on a subsurface flow wetland and a surface flow wetland, including a wetland matrix, on which planting pits and water channels are provided. Inside the water channel, a planting platform is arranged. At the bottom of the water channel, a connecting pipe is installed. At the bottom of the planting pit, a blocking block and an aeration pipe network are provided. Above the aeration pipe network in the planting pit, a support plate is embedded, and through holes are provided on the support plate;

[0009] On the support plate, stone fillers are provided. Above the stone fillers, a composite rope layer is arranged. The composite rope layer is composed of composite ropes. Above the composite rope layer, a sand layer is arranged. Above the sand layer, a soil layer is arranged;

[0010] Aeration nozzles are provided on both the connecting pipe and the aeration pipe network. On one side of the planting pit away from the water channel, a water delivery pipe connecting the bottom of the planting pit is provided;

[0011] At the highest point of the wetland matrix, a water pump is provided. The water outlet end of the water pump is connected to a nozzle facing the soil layer. And on the side of the soil layer away from the nozzle, a circulation pipe facing the water channel is provided. The water inlet of the water pump is fixedly connected to a water extraction pipe with the end at the bottom of the planting pit. Both ends of the composite rope, one end extends through the sand layer into the soil layer, and the other end extends below the support plate.

[0012] Preferably, the through holes are located 3 - 5 mm above the aeration nozzles of the aeration pipe network. The aeration pipe network is an S-shaped pipe. The positions of the through holes and the aeration nozzles on the aeration pipe network correspond up and down. Both ends of the aeration pipe network are connected to the connecting pipe.

[0013] Preferably, the diameter of the stones in the lower layer of the stone fillers is larger than the diameter of the through holes.

[0014] Preferably, the stone fillers, the composite rope layer, the sand layer and the soil layer are all located in the planting pit. Reed is planted on the sand layer and the soil layer.

[0015] Preferably, the water delivery pipe is used to transport the purified water of the subsurface flow wetland. The wetland matrix is located inside the subsurface flow wetland.

[0016] Preferably, the part of the water extraction pipe in the planting pit is suspended below the support plate. The end of the water extraction pipe away from the water pump is located on the side of the planting pit away from the water delivery pipe.

[0017] Preferably, the composite rope is composed of a water-absorbing rope core with straw ropes wound around it. The composite ropes are arranged randomly between the sand layer and the stone fillers.

[0018] Preferably, the planting platform includes planting holes, and water hyacinths are planted in the planting holes. The connecting pipe is connected to an aeration device.

[0019] (3) Beneficial effects

[0020] The present invention provides a wetland purification system based on a subsurface flow wetland and a surface flow wetland, having the following

[0021] beneficial effects:

[0022] In the present invention, one end of the composite rope layer is connected to the sand layer and the soil layer, and the other end is connected to the bottom of the planting pit, so that sewage can be sucked up by capillary action. During the process, aeration is also carried out, meeting the water and oxygen needs of the reeds. The decay of the composite rope layer can also provide effects for the reeds. More importantly, it hinders the reed roots from penetrating into the lower stone fillers, reducing the possibility of being killed by sewage, and is more conducive to maintaining the continuity and stability of the wetland purification system of the subsurface flow wetland and the surface flow wetland. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the system of the present invention;

[0024] Figure 2 is a cross-sectional view of the composite rope in the present invention.

[0025] Wherein, 1, wetland matrix; 2, planting pit; 3, stop block; 4, aeration pipe network; 5, support plate; 6, through hole; 7, connecting pipe; 8, water channel; 9, planting table; 10, stone filler; 11, circulation pipe; 12, soil layer; 13, water pump; 14, spray head; 15, composite rope layer; 16, water absorption rope core; 17, straw rope; 18, sand layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment:

[0028] As Figure 1-2 shown, the embodiment of the present invention provides a wetland purification system based on a subsurface flow wetland and a surface flow wetland, including a wetland matrix 1. A planting pit 2 and a water channel 8 are provided on the wetland matrix 1. The water channel 8 is used for the water flowing down from the surface flow wetland to flow away. A planting table 9 is arranged inside the water channel 8. The planting table 9 includes planting holes, and water hyacinths are planted in the planting holes. The roots of the water hyacinths extend below the planting table 9 through the planting holes. A connecting pipe 7 is installed at the bottom of the water channel 8. An aeration spray head is arranged on the connecting pipe 7. While aerating the sewage in the water channel 8 through the connecting pipe 7, it can also supply oxygen to the roots of the water hyacinths;

[0029] A baffle block 3 and an aeration pipe network 4 are arranged at the bottom of the planting pit 2. The baffle block 3 has an isosceles trapezoid structure, and the baffle block 3 blocks the flow of sewage flowing into the planting pit 2. The baffle blocks 3 are distributed at intervals at the bottom of the planting pit 2, so that the sewage entering the planting pit 2 can flow through between the baffle blocks 3. A support plate 5 is embedded above the aeration pipe network 4 in the planting pit 2. Through holes 6 are arranged on the support plate 5, and the through holes 6 are located 3-5 mm above the aeration nozzles of the aeration pipe network 4, facilitating the upward flow of gas and providing a good breathing environment for the roots of the reeds. The aeration pipe network 4 is a pipe in an S shape, and the positions of the through holes 6 and the aeration nozzles on the aeration pipe network 4 correspond up and down;

[0030] Stone fillers 10 are arranged on the support plate 5. The diameter of the stones in the lower layer of the stone fillers 10 is larger than the diameter of the through holes 6, and the particle sizes of the stones in the stone fillers 10 gradually decrease from bottom to top. In this way, stones with different particle sizes are stacked and distributed in a mixed manner. A composite rope layer 15 is arranged on the upper side of the stone fillers 10. The composite rope layer 15 is composed of composite ropes. The composite ropes are centered on a water-absorbing rope core 16 and are wound with straw ropes 17 around it. The composite ropes are arranged in a disorderly manner between the sand layer 18 and the stone fillers 10. A sand layer 18 is arranged on the upper side of the composite rope layer 15, and a soil layer 12 is arranged on the upper side of the sand layer 18. The stone fillers 10, the composite rope layer 15, the sand layer 18 and the soil layer 12 are all located in the planting pit 2. Reeds are planted on the sand layer 18 and the soil layer 12. Through the action of the composite rope layer 15, the sand can be blocked from entering the stone fillers 10, and a surface flow wetland is formed at the soil layer 12;

[0031] Aeration nozzles are arranged on the aeration pipe network 4 for aerating the sewage in the planting pit 2. The aeration nozzles are distributed along the surface of the S-shaped aeration pipe network 4. Both ends of the aeration pipe network are connected to a connecting pipe 7, and the connecting pipe 7 is connected to an aeration device. A water delivery pipe connecting the bottom of the planting pit 2 is arranged on one side of the planting pit 2 away from the water channel 8. The water delivery pipe is used to deliver the purified water of the subsurface flow wetland. The wetland matrix 1 is located inside the subsurface flow wetland;

[0032] A water pump 13 is arranged at the highest point of the wetland matrix 1. The water outlet end of the water pump 13 is connected to a nozzle 14 facing the soil layer 12, and a circulation pipe 11 facing the water channel 8 is arranged on the side of the soil layer 12 away from the nozzle 14. The water inlet of the water pump 13 is fixedly connected to a water suction pipe with the end at the bottom of the planting pit 2. Both ends of the composite rope extend into the soil layer 12 through the sand layer 18 at one end and extend below the support plate 5 at the other end. Under the action of capillary phenomenon, the composite rope sucks up the water at the bottom of the planting pit 2, and after aeration treatment, it can be utilized by the reeds, and it can also prevent the roots of the reeds from growing downward into the stone fillers 10 when the amount of water sprayed from the nozzle 14 is small, so that the distance from the sewage is relatively farther, avoiding the roots being directly killed by the sewage.

[0033] The part of the water extraction pipe within the planting pit 2 is suspended below the support plate 5, and the end of the water extraction pipe far from the water pump 13 is located on the side of the planting pit 2 far from the water delivery pipe.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wetland purification system based on a subsurface flow wetland and a surface flow wetland, comprising a wetland matrix (1), characterized in that: A planting pit (2) and a water channel (8) are arranged on the wetland matrix (1). A planting platform (9) is arranged inside the water channel (8). A connecting pipe (7) is installed at the bottom of the water channel (8). A stop block (3) and an aeration pipe network (4) are arranged at the bottom of the planting pit (2). A support plate (5) is embedded above the aeration pipe network (4) in the planting pit (2). Through holes (6) are arranged on the support plate (5). Stone fillers (10) are arranged on the support plate (5). A composite rope layer (15) is arranged above the stone fillers (10). The composite rope layer (15) is composed of composite ropes. A sand layer (18) is arranged above the composite rope layer (15). A soil layer (12) is arranged above the sand layer (18). Aeration nozzles are arranged on both the connecting pipe (7) and the aeration pipe network (4). A water delivery pipe connecting the bottom of the planting pit (2) is arranged at one side of the planting pit (2) away from the water channel (8). A water pump (13) is arranged at the highest position of the wetland matrix (1). The water outlet end of the water pump (13) is connected to a nozzle (14) facing the soil layer (12). A circulation pipe (11) facing the water channel (8) is arranged at one side of the soil layer (12) away from the nozzle (14). The water inlet of the water pump (13) is fixedly connected to a water extraction pipe with the end at the bottom of the planting pit (2). Both ends of the composite rope extend into the soil layer (12) through the sand layer (18) at one end and extend below the support plate (5) at the other end.

2. The wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The through holes (6) are located 3 - 5 mm above the aeration nozzles of the aeration pipe network (4). The aeration pipe network (4) is an S-shaped pipe. The positions of the through holes (6) and the aeration nozzles on the aeration pipe network (4) are vertically corresponding. Both ends of the aeration pipe network are connected to the connecting pipe (7).

3. The wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The diameter of the stones in the lower layer of the stone fillers (10) is larger than the diameter of the through holes (6).

4. A wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The stone fillers (10), the composite rope layer (15), the sand layer (18) and the soil layer (12) are all located in the planting pit (2). Reed is planted on the sand layer (18) and the soil layer (12).

5. A wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The water delivery pipe is used to deliver the purified water of the subsurface flow wetland. The wetland matrix (1) is located inside the subsurface flow wetland.

6. The wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The part of the water extraction pipe in the planting pit (2) is suspended below the support plate (5). The end of the water extraction pipe away from the water pump (13) is located at one side of the planting pit (2) away from the water delivery pipe.

7. A wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The composite rope is centered on a water-absorbing rope core (16) and is wound with straw ropes (17) around it. The composite ropes are arranged randomly between the sand layer (18) and the stone fillers (10).

8. A wetland purification system based on a subsurface flow wetland and a surface flow wetland according to claim 1, characterized in that: The planting platform (9) includes planting holes, and water hyacinths are planted in the planting holes. The connecting pipe (7) is connected to an aeration device.

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