Intermittent aeration constructed wetland device

Abstract

The utility model provides an intermittent aeration constructed wetland device and belongs to the technical field of constructed wetlands. Comprising a barrel; the main pipe penetrates into the barrel body through the bottom of the barrel body, a plurality of branch pipes which are distributed in a crotch shape are arranged on the main pipe, and a plurality of aeration assemblies which are linearly arranged are arranged on each branch pipe; the oxygenation pump is connected with a gas flowmeter through a gas conveying pipe, and the output end of the gas flowmeter is communicated with the bottom of the main pipe; and the electric heating wire wraps the outer side wall of the barrel body and is used for maintaining the temperature in the barrel body. According to the utility model, the oxygenation pump is matched with the gas conveying pipe and the main pipe to supplement oxygen to the wetland system, so that the problem of oxygen deficit of the whole constructed wetland is effectively solved; by arranging the branch pipe with the dendritic structure in the barrel body, the aeration dispersion degree of the constructed wetland system is improved, the contact area of oxygen aerated into the barrel body and sludge is increased, the oxygen dissolution degree of the oxygen is improved, and the utilization rate of the aerated oxygen is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of constructed wetlands, and particularly relates to a constructed wetland device with intermittent aeration. Background Art

[0002] In recent years, constructed wetlands have been applied to the treatment of domestic sewage and aquaculture wastewater, and have achieved certain effects. Constructed wetlands are divided into two types: surface-flow constructed wetlands and subsurface-flow constructed wetlands. A subsurface-flow constructed wetland generally consists of a wetland main body, an impermeable layer, an inlet device, and an outlet device. The wetland main body is composed of a gravel bed planted with plants, and sewage is purified through physical, chemical, and biological effects during the flowing process.

[0003] During the treatment process of sewage by a subsurface-flow constructed wetland, the presence of oxidation and nitrification bacteria groups and a necessary aerobic environment are required. The oxygen required for oxidation and nitrification reactions in the constructed wetland is mainly provided by surface reoxygenation and the root transmission of planted plants in addition to the dissolved oxygen in the sewage. Therefore, during the operation process, most wetlands do not have sufficient oxygen to support oxidation and nitrification reactions.

[0004] However, the small amount of oxygen permeated from the wetland surface reoxygenation and plant roots is negligible compared to the oxygen actually required by the wetland during the operation process, resulting in the water purification ability not only failing to reach the expected effect, but even becoming a pollution source. Therefore, this application provides a constructed wetland device with intermittent aeration to meet the demand. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a constructed wetland device with intermittent aeration to solve the problem that the small amount of oxygen permeated from the wetland surface reoxygenation and plant roots is negligible compared to the oxygen actually required by the wetland during the operation process, resulting in the water purification ability not only failing to reach the expected effect, but even becoming a pollution source.

[0006] To solve the above technical problem, the utility model provides the following technical solutions:

[0007] A constructed wetland device with intermittent aeration includes a barrel body, a partition is provided near the top inside the barrel body, and the inside of the barrel body is divided into a plant layer and a gravel layer distributed up and down by the partition; a main pipe, which penetrates into the gravel layer inside the barrel body through the bottom of the barrel body, several branch pipes distributed in a tree-branch shape are provided on the main pipe, the branch pipes are located inside the barrel body, and several aeration components are linearly arranged on each branch pipe; an aeration pump, which is connected with a gas flow meter through an air delivery pipe, and the output end of the gas flow meter is communicated with the bottom of the main pipe; a heating wire, which is wrapped on the outer side wall of the barrel body and is used to maintain the temperature inside the barrel body.

[0008] Preferably, the partition board is a water-permeable and air-permeable grid board. The gravel layer is filled with gravel and the joints are filled with inoculated sludge.

[0009] Preferably, green plants are planted in the plant layer.

[0010] Preferably, it further includes a time switch, which is electrically connected to the aeration pump and used to control the start and stop of the aeration pump.

[0011] Preferably, the main pipe and the branch pipe are internally connected, and the connection part is sealed. The end of the branch pipe away from the main pipe is of a closed structure.

[0012] Preferably, the aeration component includes a mounting seat, which is in the shape of a round box and is provided with a through hole at the bottom that is internally connected to the branch pipe.

[0013] Preferably, a plug is provided inside the mounting seat. The plug is in the shape of a round head and its bottom is hermetically connected to the bottom wall of the mounting seat.

[0014] Preferably, the plug is made of elastic rubber material, and a through hole is provided at the center position along the axial direction of the symmetry axis of the plug. The bottom of the through hole is communicated with the through hole at the bottom of the mounting seat.

[0015] Preferably, it further includes a protective bracket, which is in the shape of a cage and is fixed to the top of the side wall of the mounting seat. The protective bracket completely encloses the plug, and there is a certain gap between the inner side wall of the protective bracket and the plug.

[0016] Preferably, the barrel body is made of polyethylene material, and the main pipe and the branch pipe are both made of PVC material.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] 1. By setting an aeration pump in cooperation with an air delivery pipe and a main pipe to supply oxygen to the wetland system, the problem of overall hypoxia in the constructed wetland is effectively solved.

[0019] 2. By arranging branch pipes with a dendritic structure inside the barrel body, the aeration dispersion degree to the constructed wetland system is improved, the contact area between the oxygen introduced into the barrel body and the sludge is increased, its dissolved oxygen degree is increased, and the utilization rate of the introduced oxygen is further improved.

[0020] 3. By setting a gas flowmeter, the aeration rate and the aeration volume can be accurately controlled, which is convenient for experimental exploration of the optimal aeration interval and aeration rate.

[0021] 4. By setting an electric heating wire to heat the constructed wetland system, the internal environmental temperature is maintained, the activity of wetland flora is improved, and further the purification effect of the constructed wetland is improved. Description of the Drawings

[0022] The accompanying drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2 It is a schematic diagram of the internal structure of the present utility model;

[0025] Figure 3 It is a schematic diagram of the present utility model;

[0026] Figure 4 It is a schematic diagram of the present utility model.

[0027] In the figure: 1, barrel body; 2, aerator; 3, gas flow meter; 4, gas pipeline; 5, heating wire; 6, green plants; 7, main pipe; 8, partition board; 9, branch pipe; 10, aeration assembly; 11, mounting seat; 12, protective bracket; 13, plug; 14, through hole.

[0028] As shown in the figure, in order to clearly implement the structure of the embodiments of the present utility model, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present utility model to this specific structure, device and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications still fall within the scope of the appended claims. Detailed implementation manners

[0029] The following describes in detail an intermittent aeration artificial wetland device provided by the present utility model in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments adopt the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative ways to implement them; and the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present utility model.

[0030] Such as Figure 1 - Figure 4As shown in the figure, an embodiment of the utility model provides an intermittently aerated constructed wetland device, which includes a barrel body 1, with a partition 8 provided near the top inside. The inside of the barrel body 1 is divided into a plant layer and a gravel layer distributed vertically by the partition 8; a main pipe 7, which penetrates into the gravel layer inside the barrel body 1 through the bottom of the barrel body 1. A plurality of branch pipes 9 distributed in a tree-branch shape are provided on the main pipe 7. The branch pipes 9 are located inside the barrel body 1, and a plurality of linearly arranged aeration components 10 are provided on each branch pipe 9; an aeration pump 2, which is connected to a gas flow meter 3 through an air delivery pipe 4. The output end of the gas flow meter 3 is communicated with the bottom of the main pipe 7; a heating wire 5, which is wrapped on the outer side wall of the barrel body 1 to maintain the internal temperature of the barrel body 1. The heating wire 5 is powered by an external power supply.

[0031] By setting the aeration pump 2 in cooperation with the air delivery pipe 4 and the main pipe 7 to supplement oxygen to the wetland system, the problem of overall hypoxia in the constructed wetland is effectively solved; by arranging the branch pipe 7 with a dendritic structure inside the barrel body 1, the aeration dispersion degree of the constructed wetland system is improved, the contact area between the oxygen introduced into the barrel body 1 and the sludge is increased, its dissolved oxygen degree is increased, and the utilization rate of the introduced oxygen is further improved; by setting the gas flow meter 3, the aeration rate and the aeration volume can be accurately controlled, which is convenient for experimental exploration of the optimal aeration interval and aeration rate; by setting the heating wire 5 to heat the constructed wetland system to maintain the internal environmental temperature, the activity of the wetland flora is improved, and thus the purification effect of the constructed wetland is improved.

[0032] As Figure 2 shown, the partition 8 is a permeable and breathable grid plate. The gravel layer is filled with gravel and filled with gaps by inoculating sludge.

[0033] Among them, the preferred particle size of the gravel is 1 - 3 cm, and the preferred inoculated sludge is the activated sludge domesticated and cultured for 30 days.

[0034] As Figure 1 shown, green plants 6 are planted in the plant layer. The green plants 6 are preferably water hyacinth plants.

[0035] It also includes a time switch, which is electrically connected to the aeration pump 2 and used to control the start and stop of the aeration pump 2.

[0036] As Figure 2 shown, the inside of the main pipe 7 is communicated with the inside of the branch pipes 9, and the connection part is sealed. One end of the branch pipe 9 far away from the main pipe 7 is a closed structure.

[0037] Through this setting, it is avoided that the flowing sewage or sludge seeps into the inside of the branch pipe 9 or the main pipe 7 from the gap at the connection part, causing pipeline blockage.

[0038] As Figure 4As shown in the figure, the aeration component 10 includes a mounting base 11. The mounting base 11 has a round box-like structure, and a through hole 14 communicating with the inside of the branch pipe 9 is provided at the bottom. A plug 13 is arranged inside the mounting base 11. The plug 13 has a round head structure, and the bottom is hermetically connected to the bottom wall of the mounting base 11. The plug 13 is made of elastic rubber material, and a through hole 14 axially arranged along the symmetry axis of the plug 13 is provided at the center position. The bottom of the through hole 14 communicates with the through hole 14 at the bottom of the mounting base 11.

[0039] By providing the plug 13 made of rubber material, in the normal state, due to the self-elasticity of the rubber material, the whole plug 13 squeezes the through hole 14 inward. At this time, the through hole 14 is in a closed state, avoiding external sewage or sludge from injecting into the inside of the branch pipe 9. During aeration, due to the high-pressure environment inside the branch pipe 9, the airflow breaks through the self-elasticity of the plug 13 and opens the through hole 14 to discharge outward.

[0040] As Figure 2 shown in the figure, it further includes a protective bracket 12, which has a cage-like structure and is fixed at the top of the side wall of the mounting base 11. The protective bracket 12 completely encloses the plug 13, and there is a certain gap between the inner side wall of the protective bracket 12 and the plug 13.

[0041] Through this setting, it is used to isolate the gravel blocks inside the barrel body 1, play a certain protective role for the plug 13, avoid the plug 13 being squeezed and worn by the gravel, and at the same time avoid too many gravels squeezing the plug 13, resulting in the through hole 14 inside the plug 13 not being broken and opened by the high-pressure airflow inside the branch pipe 9, causing local blockage and affecting the aeration effect.

[0042] As Figure 2 shown in the figure, the barrel body 1 is made of polyethylene material, has a certain transparency, is convenient for observing the state of the gravel layer inside the barrel body 1, and is also convenient for degradation during later disposal. The main pipe 7 and the branch pipe 9 are both made of PVC material, avoiding the pipe body being corroded by the acid-base environment inside the barrel body 1 and extending the service life of the device.

[0043] In the actual use of the technical solution provided by the present utility model, a certain amount of activated sludge needs to be inoculated before the wetland system operates to accelerate the startup of the wetland system. The sludge after 30 days of aeration domestication and cultivation is inoculated into the wetland system, and the influent water during the startup stage of the wetland system is simulated sewage. The wetland system has periodic influent and effluent. Sampling is carried out first and then influent water is introduced at 9:00 every morning, and the influent volume of each system is 2.5 L / d. The intermittent aeration time is 12 h (9:00 - 12:00, 15:00 - 18:00, 21:00 - 24:00, 3:00 - 6:00), which is achieved by cooperating with a time switch and a gas flowmeter 3. Cooperating with a temperature monitoring component, the electric heating wire 5 is controlled to heat the barrel body 1 at a constant temperature, so that the internal environmental temperature of the barrel body 1 is stabilized in the range of 25°C ± 2°C. Through the pressurization of an oxygenation pump 2, air is pumped from the air delivery pipe 4 to the main pipe 7, and then output through each aeration component 10 on the branch pipe 9 to maintain the oxygen content of the sludge inside the wetland system and ensure the purification effect of the wetland system. In particular, it should be noted that the test results show that in a wetland system with a 1L volume environment, when the aeration volume is 0.2 L / min, the COD removal rate of the wetland system reaches more than 75%, the average ammonia nitrogen removal rate is about 98%, and the average total phosphorus removal effect reaches 99%. Therefore, the aeration volume of this device is set at 0.2 L / min for the constructed wetland.

[0044] The present utility model covers any substitutions, modifications, equivalent methods and solutions made on the essence and scope of the present utility model. In order to enable the public to have a thorough understanding of the present utility model, specific details are described in detail in the above preferred embodiments of the present utility model. However, those skilled in the art can fully understand the present utility model without these detailed descriptions. In addition, in order to avoid unnecessary confusion to the essence of the present utility model, well-known methods, processes, procedures, components and circuits are not described in detail.

[0045] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. An intermittently aerated artificial wetland device, characterized in that: include: The barrel body (1) has a partition plate (8) disposed at the top thereof, and the interior of the barrel body (1) is divided into a plant layer and a gravel layer distributed in an upper and lower manner by the partition plate (8); A main pipe (7) is inserted through the bottom of the barrel (1) into the gravel layer inside the barrel (1), the main pipe (7) is provided with a plurality of branch pipes (9) distributed in a tree-branched manner, the branch pipes (9) are located inside the barrel (1), and each branch pipe (9) is provided with a plurality of linearly arranged aeration components (10); The oxygen pump (2) is connected to a gas flow meter (3) via a gas delivery pipe (4), and the output end of the gas flow meter (3) is connected to the bottom of the main pipe (7); The electric heating wire (5) is wrapped around the outer wall of the barrel body (1) and is used to maintain the internal temperature of the barrel body (1).

2. The intermittently aerated artificial wetland device according to claim 1, characterized in that: The partition (8) is a water-permeable and air-permeable mesh plate; the gravel layer is filled with gravel and the seams are filled with inoculated sludge.

3. The intermittently aerated artificial wetland device according to claim 1, characterized in that: The plant layer is planted with green plants (6).

4. The intermittently aerated artificial wetland device according to claim 1, characterized in that: It also comprises a time switch which is electrically connected to the oxygen pump (2) and is used to control the start and stop of the oxygen pump (2).

5. The intermittently aerated artificial wetland device according to claim 1, characterized in that: The main pipe (7) is internally connected to the branch pipe (9), and the connection is sealed. The end of the branch pipe (9) away from the main pipe (7) is a closed structure.

6. The intermittently aerated artificial wetland device according to claim 1, characterized in that: The aeration assembly (10) comprises a mounting seat (11), the mounting seat (11) being in a round box-shaped structure and having a through hole (14) at the bottom thereof communicating with the interior of the branch pipe (9).

7. The intermittently aerated artificial wetland device according to claim 6, characterized in that: A plug (13) is provided inside the mounting seat (11); the plug (13) is in a round head structure, and the bottom is sealedly connected to the bottom wall of the mounting seat (11).

8. The intermittently aerated artificial wetland device according to claim 7, characterized in that: The plug (13) is made of elastic rubber material, and a through hole (14) is provided at the center thereof and is axially arranged with the axis of symmetry of the plug (13), and the bottom of the through hole (14) is connected to the through hole (14) at the bottom of the mounting seat (11).

9. The intermittently aerated artificial wetland device according to claim 8, characterized in that: It also includes a protective bracket (12) having a cage-like structure and fixed to the top of the side wall of the mounting seat (11); the protective bracket (12) completely includes the plug (13), and a certain gap exists between the inner side wall of the protective bracket (12) and the plug (13).

10. The intermittently aerated artificial wetland device according to claim 1, characterized in that: The barrel body (1) is made of polyethylene, and the main pipe (7) and branch pipe (9) are both made of PVC.

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