Composite constructed wetland with aeration treatment and sewage treatment method

Abstract

The invention discloses a composite constructed wetland with aeration treatment and a sewage treatment method.The composite constructed wetland comprises a constructed wetland body, the constructed wetland body is provided with a settling zone, a wetland zone and a water outlet zone, the settling zone comprises a water inlet canal and a water inlet pipe, and the wetland zone comprises surface water, planting soil and a matrix layer; the water outlet area comprises a water outlet channel and a water outlet pipe, an aeration system is arranged in the wetland area, and the aeration system comprises a main gas conveying pipe network and vertical gas conveying pipes uniformly distributed on the main gas conveying pipe network. By arranging the aeration system, sufficient oxygen supply is provided for microorganisms in the wetland, the activity of the microorganisms is promoted, and the problems that the organic matter removal rate is reduced, the ammonia nitrogen removal effect is poor and the like due to the fact that the constructed wetland is influenced by climate temperature can be avoided; and an internal cleaning mechanism is arranged, so that the air outlet holes and other sludge can be prevented from being blocked, the normal operation of the aeration system is ensured, and the sewage treatment efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a composite artificial wetland with increased aeration treatment and a sewage treatment method. Background Art

[0002] In related technologies, traditional artificial wetlands will be affected by climate temperature. When the water temperature is lower than a certain temperature, the treatment efficiency of the artificial wetland will drop significantly, the activity of aerobic microorganisms in the wetland will be limited, and the organic matter removal rate may be reduced; at the same time, the nitrogen nitrification process may also be hindered, resulting in poor ammonia nitrogen removal effect and poor sewage treatment effect. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the first object of the present invention is to provide a composite artificial wetland with increased aeration treatment.

[0004] The second object of the present invention is to provide a sewage treatment method.

[0005] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a composite artificial wetland with increased aeration treatment, wherein the composite artificial wetland includes an artificial wetland body, wherein the artificial wetland body is provided with a sedimentation area, a wetland area and a water outlet area; the sedimentation area includes an inlet channel and an inlet pipe, wherein the inlet channel is arranged on one side of the wetland area, and the inlet pipe is arranged between the sedimentation area and the inlet channel; the wetland area includes surface water, a planting soil layer and a matrix layer, wherein the matrix layer is located at the bottom of the wetland area, the planting soil layer is arranged on the top of the matrix layer, and the planting The soil layer is suitable for planting emergent plants, the surface water level is higher than the top surface of the planting soil layer, the bottom of the water inlet channel is connected to the wetland area; the water outlet area includes a water outlet channel and a water outlet pipe, the water outlet channel is arranged on the other side of the wetland area, and the water outlet pipe is arranged between the wetland area and the water outlet channel; an aeration system is arranged in the wetland area, the aeration system includes a main gas pipeline network and vertical gas pipelines evenly distributed on the main gas pipeline network, the vertical gas pipelines are all provided with air outlet holes, and the vertical gas pipelines are provided with an internal cleaning mechanism.

[0006] According to one embodiment of the present invention, the internal cleaning mechanism includes a rotor and a sleeve cover, the rotor is evenly distributed with spiral blades, a rotor bracket is installed in the vertical air pipe, the rotor is rotatably installed between two rotor brackets, a connecting shaft is installed on the top of the rotor, and the connecting shaft passes through the rotor bracket above the rotor.

[0007] According to one embodiment of the present invention, the sleeve cover is installed on the top of the vertical gas pipe, a sleeve is installed on the bottom of the sleeve cover, a sleeve hole is opened on the sleeve, and an outer wall scraper is rotatably installed on the sleeve cover, and the outer wall scraper is in contact with the outer surface of the vertical gas pipe.

[0008] According to an embodiment of the present invention, the sleeve is located in the vertical gas transmission pipe and above the rotor support, and the sleeve hole is at the same height as the air outlet hole.

[0009] According to one embodiment of the present invention, a hexagonal connection port is provided on the outer wall scraper, and a hexagonal connection head is provided on the top of the connecting shaft, and the hexagonal connection port is adapted to the hexagonal connection head.

[0010] According to one embodiment of the present invention, the main gas transmission pipeline network is arranged in the matrix layer, and the front end of the main gas transmission pipeline network extends to the ground surface and is connected to an air pump.

[0011] According to one embodiment of the present invention, the top of the vertical gas pipe is higher than the planting soil layer, and the portion of the vertical gas pipe where the air outlet is opened is located in the surface water.

[0012] According to one embodiment of the present invention, the matrix layer includes a bottom layer, a second layer, a third layer, a fourth layer and a top layer, the bottom layer is located at the bottom of the matrix layer, the second layer is arranged above the bottom layer, the third layer is arranged above the second layer, the fourth layer is arranged above the third layer, the top layer is arranged above the fourth layer, and the top layer is located below the planting soil layer.

[0013] According to one embodiment of the present invention, the bottom layer adopts a sand and gravel mixture with a volume ratio of 1:1 and a height of 10 to 20 cm; the second layer adopts a blast furnace slag and crushed stone mixture with a volume ratio of 1:1 and a height of 10 to 30 cm; the third layer adopts a limestone and zeolite mixture with a volume ratio of 1:1 and a height of 10 to 30 cm; the fourth layer adopts coarse sand and a height of 5 to 20 cm; the top layer adopts crushed stone and a height of 10 to 30 cm; sand, gravel and zeolite need to be pretreated before use to remove impurities and adjust the particle size distribution.

[0014] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a sewage treatment method based on the above-mentioned composite artificial wetland with increased aeration treatment, the method comprising: S1, sewage enters the sedimentation area to precipitate silt and remove larger suspended matter and particulate matter; S2, the sewage in the sedimentation area reaches the inlet channel through the inlet pipe and enters the wetland area through the connecting point at the bottom of the inlet channel; S3, the sewage is subjected to microbial treatment from bottom to top in the wetland area, and oxygen is added to the wetland area through the aeration system to promote microbial activity and reproduction; S4, the sewage is discharged through the outlet area after the water quality is purified in the wetland area, and is used for irrigation, breeding or discharged into natural water bodies.

[0015] The composite artificial wetland with added aeration treatment according to the embodiment of the present invention has the following beneficial effects:

[0016] 1. The present invention provides sufficient oxygen supply for the microorganisms in the wetland by setting an aeration system, promotes the activity of microorganisms, and avoids the artificial wetland being affected by the climate temperature. When the water temperature is lower than a certain temperature, the treatment efficiency of the artificial wetland will be significantly reduced, the activity of aerobic microorganisms in the wetland will be limited, the organic matter removal rate may be reduced, and the nitrogen nitrification process may also be hindered, resulting in poor ammonia nitrogen removal effect and other problems.

[0017] 2. The present invention provides an internal cleaning mechanism. When the aeration system is working, the outer wall scraper rotates to scrape off the silt and the like attached to the outer wall of the vertical gas pipe to prevent the air outlet from being blocked. A sleeve is provided to scrape off the silt and the like entering the inner wall of the vertical gas pipe from the air outlet, and the silt and the like entering the vertical gas pipe through the air outlet is brought out of the vertical gas pipe to further prevent the air outlet from being blocked.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall three-dimensional structure of a composite artificial wetland according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the sedimentation area, the wet area and the water outlet area according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the overall cross-sectional structure of a composite artificial wetland according to an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the structure of a main gas transmission network and vertical gas transmission pipes according to an embodiment of the present invention;

[0023] Figure 5is a schematic structural diagram of a rotor, a casing and other structures according to an embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of a vertical gas transmission pipe and a casing cover according to an embodiment of the present invention;

[0025] Figure 7 is a schematic cross-sectional structural diagram of an internal cleaning mechanism according to an embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the layer structure of the planting soil layer and the substrate layer according to an embodiment of the present invention;

[0027] Fig. 9 Flow chart of a sewage treatment method according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. The main body of the artificial wetland; 2. The sedimentation area; 3. The wetland area; 4. The outlet area; 5. The aeration system; 6. The internal cleaning mechanism; 210. The inlet channel; 220. The inlet pipe; 310. The surface water; 320. The planting soil layer; 330. The matrix layer; 331. The bottom layer; 332. The second layer; 333. The third layer; 334. The fourth layer; 335. The top layer; 410. The outlet channel; 420. The outlet pipe; 510. The main gas pipeline network; 520. The vertical gas pipeline; 521. The air outlet; 610. The rotor; 611. The spiral blade; 612. The rotor bracket; 613. The connecting shaft; 614. The hexagonal connector; 620. The casing cover; 621. The casing; 622. The casing hole; 623. The outer wall scraper; 624. The hexagonal connector. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The composite artificial wetland and sewage treatment method with added aeration treatment according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0032] Composite artificial wetlands are a type of sewage treatment ecosystem that integrates the purification function of natural wetlands with the wisdom of artificial design. It simulates the operating mechanism of natural wetlands and achieves efficient purification of sewage through the series and parallel connection of multi-level wetland units. In this system, water flows through carefully selected substrate layers, such as sand, gravel, etc. These substrates not only provide a place for microorganisms to attach and reproduce, but also remove suspended matter and soluble substances in the water through physical filtration and chemical adsorption. At the same time, aquatic plants in the wetland absorb and transport nutrients through their roots to further purify the water quality. Composite artificial wetlands can not only effectively remove organic matter, nitrogen, phosphorus and other pollutants in sewage, but also improve the stability of the ecosystem, increase biodiversity, and provide a beautiful ecological environment for surrounding residents.

[0033] like Figures 1 to 8 As shown, the composite artificial wetland with increased aeration treatment in the embodiment of the present invention comprises an artificial wetland body 1, and the artificial wetland body 1 is provided with a sedimentation area 2, a wetland area 3 and a water outlet area 4; the sedimentation area 2 comprises an inlet channel 210 and an inlet pipe 220, the inlet channel 210 is arranged on one side of the wetland area 3, and the inlet pipe 220 is arranged between the sedimentation area 2 and the inlet channel 210; the wetland area 3 comprises surface water 310, a planting soil layer 320 and a matrix layer 330, the matrix layer 330 is located at the bottom of the wetland area 3, the planting soil layer 320 is arranged on the top of the matrix layer 330, and the planting soil layer 320 is suitable for Emergent plants are planted, the horizontal plane of the surface water 310 is higher than the top surface of the planting soil layer 320, and the bottom of the water inlet channel 210 is connected to the wetland area 3; the water outlet area 4 includes an outlet channel 410 and an outlet pipe 420, the outlet channel 410 is arranged on the other side of the wetland area 3, and the outlet pipe 420 is arranged between the wetland area 3 and the outlet channel 410; an aeration system 5 is arranged in the wetland area 3, and the aeration system 5 includes a main gas pipeline network 510 and vertical gas pipelines 520 evenly distributed on the main gas pipeline network 510, and the vertical gas pipelines 520 are all provided with air outlet holes 521, and the vertical gas pipelines 520 are provided with an internal cleaning mechanism 6.

[0034] Specifically, when the composite artificial wetland treats sewage, the sewage first enters the sedimentation area 2 to precipitate sediment and remove larger suspended matter and particulate matter. Then, the sewage in the sedimentation area 2 flows into the inlet channel 210 through the inlet pipe 220, and enters the wetland area 3 through the connection at the bottom of the inlet channel 210. The sewage passes through the matrix layer 330 and the planting soil layer 320 from bottom to top for microbial treatment, and forms surface water 310. Among them, the matrix layer 330 provides a medium for microorganisms to attach and grow, and is also the basis for the growth of the root system of emergent plants. The emergent plants in the planting soil layer 320 help absorb and degrade pollutants. Therefore, through the combined action of multiple pathways such as physical precipitation, plant absorption, and microbial degradation, suspended matter, organic matter, nitrogen, phosphorus and other pollutants in sewage are effectively removed, and the purpose of purifying water quality is finally achieved.

[0035] Furthermore, the aeration system 5 can supplement oxygen into the wetland area 3 to promote the activity and reproduction of microorganisms. Specifically, air is transported to the wetland area 3 through the main gas pipeline network 510, and is transported to various areas of the wetland area 3 through multiple vertical gas pipelines 520 evenly distributed on the main gas pipeline network 510. The air outlet 521 releases air into the wetland area 3 to supplement oxygen into the wetland area 3 to promote the activity and reproduction of microorganisms. It should be understood that the principle of the aeration system 5 is to disperse air into tiny bubbles and inject them into the water body through mechanical equipment or natural means, increase the contact area between the water body and the air, and accelerate the transfer process of oxygen from the gas phase to the liquid phase; its function is to provide sufficient dissolved oxygen for the water body, promote the activity and reproduction of microorganisms, accelerate the decomposition and transformation of organic pollutants, and thus effectively purify the water quality. After the sewage is purified in the wetland area 3, it flows into the outlet channel 410 through the outlet pipe 420, and is discharged through the outlet channel 410 for irrigation, breeding or discharge into natural water bodies.

[0036] As the sewage treatment proceeds, the sludge and the like in the sewage will enter the inner wall of the vertical gas pipe 520 from the air outlet 521, so that the inner wall of the vertical gas pipe 520 and the air outlet 521 are blocked by the sludge and the like. When the aeration system 5 is working, the internal cleaning mechanism 6 in the vertical gas pipe 520 works to scrape off the sludge on the inner wall of the vertical gas pipe 520 and bring the sludge and the like out of the vertical gas pipe 520 through the air outlet 521, thereby preventing the air outlet 521 from being blocked, thereby ensuring the normal operation of the aeration system 5 and improving the sewage treatment efficiency.

[0037] Therefore, the composite artificial wetland of the embodiment of the present invention, by setting up an aeration system 5, provides sufficient oxygen supply for the microorganisms in the wetland, promotes the activity of the microorganisms, and avoids the artificial wetland being affected by the climate temperature. When the water temperature is lower than a certain temperature, the treatment efficiency of the artificial wetland will be significantly reduced, the activity of aerobic microorganisms in the wetland will be limited, the organic matter removal rate may be reduced, and the nitrogen nitrification process may also be hindered, resulting in problems such as poor ammonia nitrogen removal effect; and by setting up an internal cleaning mechanism 6, it is possible to prevent silt from clogging the air outlet 521, thereby ensuring the normal operation of the aeration system 5 and improving the sewage treatment efficiency.

[0038] According to one embodiment of the present invention, Figures 5 to 7 As shown, the internal cleaning mechanism 6 includes a rotor 610 and a sleeve cover 620, the rotor 610 is evenly distributed with spiral blades 611, a rotor bracket 612 is installed in the vertical air pipe 520, the rotor 610 is rotatably installed between the two rotor brackets 612, and a connecting shaft 613 is installed on the top of the rotor 610, and the connecting shaft 613 passes through the rotor bracket 612 above the rotor 610.

[0039] Further, according to one embodiment of the present invention, a sleeve cover 620 is installed on the top of the vertical gas pipe 520, a sleeve 621 is installed on the bottom of the sleeve cover 620, a sleeve hole 622 is opened on the sleeve 621, and an outer wall scraper 623 is rotatably installed on the sleeve cover 620, and the outer wall scraper 623 contacts the outer surface of the vertical gas pipe 520.

[0040] Further, according to one embodiment of the present invention, Figures 5 to 7 As shown, the sleeve 621 is located in the vertical gas delivery pipe 520 and above the rotor support 612 , and the sleeve hole 622 is at the same height as the gas outlet hole 521 .

[0041] Further, according to one embodiment of the present invention, Figures 5 to 7 As shown, a hexagonal connection opening 624 is provided on the outer wall scraper 623 , and a hexagonal connection head 614 is provided on the top of the connecting shaft 613 , and the hexagonal connection opening 624 is matched with the hexagonal connection head 614 .

[0042] Specifically, when the airflow passes through the rotor 610 in the vertical gas transmission pipe 520, the gas acts on the spiral blades 611, causing the rotor 610 to rotate and driving the outer wall scraper 623 on the sleeve cover 620 to rotate, scraping off the silt attached to the outer wall of the vertical gas transmission pipe 520 to prevent the gas outlet 521 from being blocked. After running for a period of time, the sleeve cover 620 is opened to make the sleeve 621 at the bottom of the sleeve cover 620 rise and scrape off the silt from the gas outlet during the rising process. The silt and other debris that enter the inner wall of the vertical gas pipe 520 through the air outlet hole 521 will be brought out of the vertical gas pipe 520, and the sleeve 621 will be cleaned and reinserted into the vertical gas pipe 520. During the insertion, ensure that the hexagonal connector 614 of the connecting shaft 613 and the hexagonal connecting port 624 of the outer wall scraper 623 are mutually engaged, so as to ensure that the rotor 610 can drive the outer wall scraper 623 to rotate through the connecting shaft 613.

[0043] According to one embodiment of the present invention, Figures 1 to 4 As shown, the main gas transmission pipeline network 510 is arranged in the substrate layer 330, and the front end of the main gas transmission pipeline network 510 extends to the ground surface and is connected to the air pump.

[0044] According to one embodiment of the present invention, Figure 3 As shown, the top of the vertical air pipe 520 is higher than the planting soil layer 320 , and the portion of the vertical air pipe 520 where the air outlet 521 is opened is located in the surface water 310 .

[0045] Specifically, during the process of microbial treatment in the wetland area 3, air is transported into the main gas pipeline network 510 through an air pump, and the air flows through the air outlet 521 of the vertical gas pipeline 520 and is released into the water body to promote the activity of microorganisms.

[0046] According to one embodiment of the present invention, Figure 8 As shown, the matrix layer 330 includes a bottom layer 331, a second layer 332, a third layer 333, a fourth layer 334 and a top layer 335. The bottom layer 331 is located at the bottom of the matrix layer 330, the second layer 332 is arranged above the bottom layer 331, the third layer 333 is arranged above the second layer 332, the fourth layer 334 is arranged above the third layer 333, the top layer 335 is arranged above the fourth layer 334, and the top layer 335 is located below the planting soil layer 320.

[0047] Further, according to one embodiment of the present invention, the bottom layer 331 adopts a sand and gravel mixture with a volume ratio of 1:1 and a height of 10 to 20 cm; the second layer 332 adopts a blast furnace slag and crushed stone mixture with a volume ratio of 1:1 and a height of 10 to 30 cm; the third layer 333 adopts a limestone and zeolite mixture with a volume ratio of 1:1 and a height of 10 to 30 cm; the fourth layer 334 adopts coarse sand and a height of 5 to 20 cm; the top layer 335 adopts crushed stone and a height of 10 to 30 cm; sand, gravel and zeolite need to be pretreated before use to remove impurities and adjust the particle size distribution.

[0048] Specifically, the sand and gravel mixture used in the bottom layer 331 has good permeability and stability, which helps to support the upper structure; the blast furnace slag used in the second layer 332 is rich in minerals and can serve as an attachment medium for microorganisms, while the gravel provides structural stability; the limestone used in the third layer 333 can adjust the pH value of the wetland, and the zeolite has a strong adsorption capacity and can remove heavy metals and organic pollutants in the water; the coarse sand used in the fourth layer 334 provides good permeability and helps to evenly distribute water in the wetland; the gravel used in the top layer 335 can serve as a support for the planting soil layer 320, while preventing the loss of planting soil in the planting soil layer 320.

[0049] Combine the following Figures 1 to 8 The working principle of the composite artificial wetland with added aeration treatment in the embodiment of the present invention is described in detail:

[0050] After the sewage enters the sedimentation area 2 to settle the silt and remove the larger suspended matter and particulate matter, it reaches the inlet channel 210 through the inlet pipe 220 and enters the wetland area 3 through the connection at the bottom of the inlet channel 210. The sewage is treated by microorganisms and absorbed by plants from bottom to top in the wetland area 3, and oxygen is added to the wetland area 3 through the aeration system 5 to promote the activity and reproduction of microorganisms. After the sewage purifies the water quality in the wetland area 3, it is discharged through the outlet area 4 for irrigation, breeding or discharge into natural water bodies. During the microbial treatment in the wetland area 3, air is transported to the main gas pipeline network 510 through an air pump, and the air flows through the outlet hole 521 of the vertical gas pipeline 520 and is released into the water body to promote the activity of microorganisms. When the airflow passes through the rotor 610 in the vertical gas pipeline 520, the gas acts on the spiral blades 611. The rotor 610 is rotated and drives the outer wall scraper 623 on the sleeve cover 620 to rotate, scraping off the silt and the like attached to the outer wall of the vertical gas pipe 520 to prevent the air outlet 521 from being blocked. After running for a period of time, the sleeve cover 620 is opened to make the sleeve 621 at the bottom of the sleeve cover 620 rise. During the rising process, the silt and the like entering the inner wall of the vertical gas pipe 520 from the air outlet 521 are scraped off, and the silt and the like entering the vertical gas pipe 520 through the air outlet 521 are brought out of the vertical gas pipe 520. After cleaning the sleeve 621, it is reinserted into the vertical gas pipe 520. When inserting, ensure that the hexagonal connector 614 of the connecting shaft 613 and the hexagonal connecting port 624 of the outer wall scraper 623 are mutually engaged, so as to ensure that the rotor 610 can drive the outer wall scraper 623 to rotate through the connecting shaft 613.

[0051] Corresponding to the above embodiment, the present invention also proposes a sewage treatment method.

[0052] Fig. 9 Flow chart of a sewage treatment method according to an embodiment of the present invention.

[0053] like Fig. 9 As shown, the sewage treatment method based on the composite artificial wetland with added aeration treatment according to the embodiment of the present invention may include the following steps:

[0054] S1, sewage enters the sedimentation area to settle the silt and remove larger suspended matter and particulate matter;

[0055] S2, sewage in the sedimentation area reaches the inlet channel through the inlet pipe and enters the wetland area through the connection at the bottom of the inlet channel;

[0056] S3, sewage is treated by microorganisms in the wetland area from bottom to top, and oxygen is added to the wetland area through the aeration system to promote microbial activity and reproduction;

[0057] S4, sewage is purified in the wetland area and then discharged through the outlet area for use in irrigation, aquaculture or discharge into natural water bodies.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A composite artificial wetland with increased aeration treatment, characterized in that: The composite artificial wetland comprises an artificial wetland body (1), wherein the artificial wetland body (1) is provided with a sedimentation area (2), a wetland area (3) and a water outlet area (4); The sedimentation area (2) comprises a water inlet channel (210) and a water inlet pipe (220), wherein the water inlet channel (210) is arranged on one side of the wetland area (3), and the water inlet pipe (220) is arranged between the sedimentation area (2) and the water inlet channel (210); The wetland area (3) comprises surface water (310), a planting soil layer (320) and a matrix layer (330); the matrix layer (330) is located at the bottom of the wetland area (3); the planting soil layer (320) is located at the top of the matrix layer (330); the planting soil layer (320) is suitable for planting emergent plants; the surface water (310) has a higher level than the top of the planting soil layer (320); and the bottom of the water inlet channel (210) is connected to the wetland area (3); The water outlet area (4) comprises a water outlet channel (410) and a water outlet pipe (420), wherein the water outlet channel (410) is arranged at the other side of the wetland area (3), and the water outlet pipe (420) is arranged between the wetland area (3) and the water outlet channel (410); An aeration system (5) is provided in the wet area (3), and the aeration system (5) comprises a main gas pipeline network (510) and vertical gas pipelines (520) evenly distributed on the main gas pipeline network (510), each of the vertical gas pipelines (520) is provided with an air outlet (521), and an internal cleaning mechanism (6) is provided in the vertical gas pipeline (520).

2. The composite artificial wetland with increased aeration treatment according to claim 1, characterized in that: The internal cleaning mechanism (6) comprises a rotor (610) and a sleeve cover (620), the rotor (610) being evenly distributed with spiral blades (611), a rotor bracket (612) being installed in the vertical gas transmission pipe (520), the rotor (610) being rotatably installed between two rotor brackets (612), a connecting shaft (613) being installed at the top of the rotor (610), and the connecting shaft (613) penetrating the rotor bracket (612) above the rotor (610).

3. The composite artificial wetland with increased aeration treatment according to claim 2, characterized in that: The sleeve cover (620) is installed on the top of the vertical gas transmission pipe (520), and a sleeve (621) is installed on the bottom of the sleeve cover (620). The sleeve (621) is provided with a sleeve hole (622). An outer wall scraper (623) is rotatably installed on the sleeve cover (620), and the outer wall scraper (623) is in contact with the outer surface of the vertical gas transmission pipe (520).

4. The composite artificial wetland with increased aeration treatment according to claim 3, characterized in that: The sleeve (621) is located inside the vertical gas delivery pipe (520) and above the rotor support (612), and the sleeve hole (622) is at the same height as the gas outlet hole (521).

5. The composite artificial wetland with increased aeration treatment according to claim 4, characterized in that: The outer wall scraper (623) is provided with a hexagonal connection port (624), the top of the connection shaft (613) is provided with a hexagonal connection head (614), and the hexagonal connection port (624) is adapted to the hexagonal connection head (614).

6. The composite artificial wetland with increased aeration treatment according to claim 1, characterized in that: The main gas transmission pipeline network (510) is arranged in the substrate layer (330), and the front end of the main gas transmission pipeline network (510) extends to the ground surface and is connected to an air pump.

7. The composite artificial wetland with increased aeration treatment according to claim 1, characterized in that: The top of the vertical gas transmission pipe (520) is higher than the planting soil layer (320), and the portion of the vertical gas transmission pipe (520) where the air outlet (521) is opened is located in the surface water (310).

8. The composite artificial wetland with increased aeration treatment according to claim 1, characterized in that: The matrix layer (330) includes a bottom layer (331), a second layer (332), a third layer (333), a fourth layer (334) and a top layer (335), wherein the bottom layer (331) is located at the bottom of the matrix layer (330), the second layer (332) is located above the bottom layer (331), the third layer (333) is located above the second layer (332), the fourth layer (334) is located above the third layer (333), the top layer (335) is located above the fourth layer (334), and the top layer (335) is located below the planting soil layer (320).

9. The composite artificial wetland with increased aeration treatment according to claim 8, characterized in that: The bottom layer (331) is made of a sand-stone mixture with a volume ratio of 1:1 and has a height of 10 to 20 cm; The second layer (332) is made of a mixture of blast furnace slag and crushed stone in a volume ratio of 1:1, and has a height of 10 to 30 cm; The third layer (333) is made of a mixture of limestone and zeolite in a volume ratio of 1:1, and has a height of 10 to 30 cm; The fourth layer (334) is made of coarse sand and has a height of 5 to 20 cm; The top layer (335) is made of crushed stone and has a height of 10 to 30 cm; Sand, gravel and zeolite need to be pre-treated before use to remove impurities and adjust the particle size distribution.

10. A sewage treatment method based on a composite artificial wetland with increased aeration treatment according to any one of claims 1 to 9, characterized in that: The method comprises: S1, sewage enters the sedimentation area to settle the silt and remove larger suspended matter and particulate matter; S2, sewage in the sedimentation area reaches the inlet channel through the inlet pipe and enters the wetland area through the connection at the bottom of the inlet channel; S3, sewage is treated by microorganisms in the wetland area from bottom to top, and oxygen is added to the wetland area through the aeration system to promote microbial activity and reproduction; S4, sewage is purified in the wetland area and then discharged through the outlet area for use in irrigation, aquaculture or discharge into natural water bodies.

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