Aeration backwashing device for reducing blockage of percolation tank of constructed wetland

Abstract

The utility model relates to an aeration backwashing device for reducing blockage of a percolation tank of a constructed wetland. The device comprises a pore plate, a first backwash main pipe, a first backwash branch pipe, a second backwash main pipe and a second backwash branch pipe, a percolation tank is separated by the pore plate, the upper layer is a percolation layer, the lower layer is a drainage layer, the first backwash main pipe is mounted below an aeration main pipe, and the second backwash main pipe is mounted below the aeration main pipe. First backwash branch pipes corresponding to the aeration branch pipes are uniformly arranged on the first backwash main pipe, exhaust holes are uniformly formed in the first backwash branch pipes, and the first backwash main pipe is connected with air supply equipment through a second air supply pipe; the second backwash main pipe is mounted at the drainage layer, second backwash branch pipes are uniformly arranged on the second backwash main pipe, drainage holes are uniformly formed in the second backwash branch pipes, and the second backwash main pipe is connected with water supply equipment through a water supply pipe. According to the scheme provided by the invention, the percolation layer can be backwashed in a water-gas combination manner, and the blockage clearing effect on the percolation layer is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of infiltration tank cleaning, in particular to an aeration backwashing device for reducing clogging of an infiltration tank of a constructed wetland. BACKGROUND

[0002] The infiltration tank of a constructed wetland is a wastewater treatment technology that simulates the functions of a natural wetland. It purifies water through the triple synergistic action of physics, chemistry, and biology. During operation, the infiltration layer traps suspended solids and other impurities in the water. Over time, these impurities may accumulate in the infiltration layer, causing the filter material channels to clog and reducing filtration efficiency.

[0003] An aeration device is usually installed at the bottom of the infiltration tank. During aeration, gas bubbles can loosen and carry away some of the impurities attached to the filter material during their upward movement, to some extent alleviating the problem of infiltration layer clogging. However, due to the small diameter of the aeration holes, the output air pressure is low, and the amount of gas is limited, resulting in poor cleaning effect and failing to meet the cleaning requirements.

[0004] A common method for cleaning the clogging is to remove all the filter material and clean it, and then fill the cleaned filter material into the infiltration tank. This method is time-consuming and labor-intensive. CONTENT OF THE INVENTION

[0005] To solve or partially solve the problems in the related art, the present application provides an aeration backwashing device for reducing clogging of an infiltration tank of a constructed wetland. The device can backwash the infiltration layer through a combination of water and gas, ensuring the cleaning effect of the infiltration layer.

[0006] The present application provides an aeration backwashing device for reducing clogging of an infiltration tank of a constructed wetland, comprising a perforated plate, an aeration main pipe, an aeration branch pipe, a first backwashing main pipe, a first backwashing branch pipe, a second backwashing main pipe, and a second backwashing branch pipe. The perforated plate is installed at the bottom of the infiltration tank, dividing the tank into two layers, the upper layer being the infiltration layer and the lower layer being the drainage layer. The aeration main pipe is installed at the bottom of the infiltration layer, and the aeration branch pipes are evenly arranged on the aeration main pipe. The aeration branch pipes are evenly provided with aeration holes, and the aeration main pipe is connected to a gas supply device through a first gas supply pipe. The first backwashing main pipe is installed below the aeration main pipe, and the first backwashing branch pipes corresponding to the aeration branch pipes are evenly arranged on the first backwashing main pipe. The first backwashing branch pipes are evenly provided with exhaust holes, and the first backwashing main pipe is connected to the gas supply device through a second gas supply pipe. The second backwashing main pipe is installed at the drainage layer, and the second backwashing branch pipes are evenly arranged on the second backwashing main pipe. The second backwashing branch pipes are evenly provided with drainage holes, and the second backwashing main pipe is connected to a water supply device through a water supply pipe.

[0007] Optionally, in some embodiments, the filtration layer is divided into a gravel layer, a filter layer and a mounting layer from top to bottom, and the aeration main pipe, the aeration branch pipe, the first backwashing main pipe and the first backwashing branch pipe are arranged at the mounting layer.

[0008] Optionally, in some embodiments, a first valve is arranged on the first gas supply pipe, a second valve is arranged on the second gas supply pipe, and a third valve is arranged on the water supply pipe.

[0009] Optionally, in some embodiments, an overflow pipe is connected between the aeration main pipe and the first backwashing main pipe, an overflow valve is arranged on the overflow pipe, and the gas in the aeration main pipe can enter the first backwashing main pipe through the overflow valve.

[0010] Optionally, in some embodiments, a water inlet main pipe is arranged on the top of the filtration tank, a plurality of water inlet branch pipes are arranged on one side of the water inlet main pipe, and sewage pipes and clean water pipes are connected to the other side of the water inlet main pipe through sewage valves and clean water valves respectively.

[0011] Optionally, in some embodiments, an overflow port is arranged on the side of the filtration tank opposite to the water inlet main pipe, and a drainage channel is connected to the overflow port.

[0012] Optionally, in some embodiments, a drainage pipe is arranged at the drainage layer, and a drainage valve is arranged on the drainage pipe.

[0013] The technical scheme provided by the present application can have the following beneficial effects:

[0014] The first backwashing branch pipe can be used for air backwashing of the filtration layer, compressed air is introduced into the filter material layer to form air bubbles, the air bubbles can disturb the filter material layer during the rising process, loosen and remove the impurities attached to the filter material, the second backwashing branch pipe can be used for water backwashing of the filtration layer, the particles and biofilm in the filtration layer are further flushed out by the water flow to restore the permeability of the filter material, and the surface of the aeration branch pipe is backwashed at the same time to ensure the smoothness of the aeration holes.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout the several views, and in which the exemplary embodiments of the present application are shown.

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic view of the filler layer of the present application;

[0019] Figure 3 is a schematic view of a partial structure of the present application;

[0020] Figure 4 is a left view of a partial structure of the present application;

[0021] Figure 5 is a rear view of a partial structure of the present application;

[0022] Figure 6 is a schematic view of another aeration structure of the present application;

[0023] Figure 7 is a rear view of another aeration structure of the present application.

[0024] Reference numerals:

[0025] 1 - infiltration tank, 11 - hole plate, 12 - overflow, 13 - drainage layer, 14 - infiltration layer, 15 - gravel layer, 16 - filter layer, 17 - installation layer, 2 - first air supply pipe, 21 - first valve, 22 - aeration main pipe, 221 - first aeration sub-pipe, 222 - second aeration sub-pipe, 23 - overflow pipe, 24 - overflow valve, 25 - aeration branch pipe; 3 - second air supply pipe, 31 - second valve, 32 - first backwash main pipe, 33 - first backwash sub-pipe, 4 - water supply pipe, 41 - third valve, 42 - second backwash main pipe, 43 - second backwash sub-pipe, 5 - water inlet main pipe, 51 - water inlet sub-pipe, 6 - sewage pipe, 61 - sewage valve, 7 - clean water pipe, 71 - clean water valve, 8 - drainage channel, 9 - drainage pipe, 91 - drainage valve. DETAILED DESCRIPTION

[0026] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0027] It should be understood that, although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Referring to Figure 1 A kind of aeration backwashing device for reducing artificial wetland infiltration pool blockage, including orifice plate 11, aeration main pipe 22, aeration branch pipe 25, first backwashing main pipe 32, first backwashing branch pipe 33, second backwashing main pipe 42, second backwashing branch pipe 43, orifice plate 11 is uniformly distributed with water pass hole, and orifice plate 11 is fixedly installed in the bottom of infiltration pool 1 by support;

[0031] Referring to Figure 2The percolation tank 1 is divided into two layers by the orifice plate 11, the upper layer is the percolation layer 14, and the lower layer is the drainage layer 13. The drainage layer 13 is not filled, so that the filtered water can be conveniently collected and discharged. The second backwashing main pipe 42 is installed at the drainage layer 13. The second backwashing main pipe 42 is uniformly provided with a plurality of second backwashing branch pipes 43. The second backwashing branch pipes 43 are uniformly provided with drainage holes. The second backwashing main pipe 42 is connected with an external water supply device through the water supply pipe 4. In order to conveniently control the water supply, the third valve 41 is installed on the water supply pipe 4. The drainage pipe 9 is installed at the drainage layer 13, and is used to discharge the water treated by the percolation tank 1. The drainage valve 91 is installed on the drainage pipe 9.

[0032] The percolation layer 14 is sequentially divided into the gravel layer 15, the filter layer 16, and the installation layer 17 from top to bottom. The aeration main pipe 22, the aeration branch pipe 25, the first backwashing main pipe 32, and the first backwashing branch pipe 33 are arranged at the installation layer 17. The installation layer 17 is filled with gravel with a particle size of 50-70 mm. The large-particle-size gravel has large gaps between the particles. The large-particle-size gravel can support the filter layer 16 and facilitate the water and gas to pass through the installation layer 17 to clean the filter layer 16 during backwashing. The filter layer 16 is filled with gravel with a particle size of 20-50 mm. The gravel layers of the filter layer 16 are arranged in a gradient order of decreasing particle size from top to bottom, forming a gradient filter layer. This design allows the water to flow through the gravel layer with a large particle size first, and then gradually transition to the gravel layer with a small particle size. The large gravel can capture large suspended particles and sediments, and the small gravel can capture smaller particles. The layered filtration reduces the risk of clogging of a single-particle-size gravel layer and facilitates the subsequent backwashing to flush the particles and biofilm out of the gaps. The gravel layer 15 is filled with gravel with a particle size of 60-80 mm. The large-particle-size gravel can press the filter layer 16 to prevent the water from washing away the small-particle-size gravel of the filter layer 16. Aquatic plants are planted on the gravel layer 15, further improving the treatment effect of the percolation tank on sewage.

[0033] Referring to Figures 3-5 The aeration main pipe 22 is installed at the installation layer 17. The aeration main pipe 22 is uniformly provided with the aeration branch pipe 25. The aeration branch pipe 25 is uniformly provided with aeration holes. The aeration main pipe 22 is connected with an external gas supply device through the first gas supply pipe 2. In order to conveniently control the gas supply of the aeration main pipe 22, the first valve 21 is installed on the first gas supply pipe 2.

[0034] The first backwash main pipe 32 is installed below the aeration main pipe 22, and a plurality of first backwash branch pipes 33 corresponding to the aeration branch pipes 25 are uniformly arranged on the first backwash main pipe 32, and the first backwash branch pipes 33 are uniformly provided with air outlet holes, and the first backwash main pipe 32 is connected to the external air supply equipment through the second air supply pipe 3, and a second valve 31 is installed on the second air supply pipe 3 to facilitate the control of the air supply of the first backwash main pipe 32.

[0035] When the filtration layer 14 is blocked, the air backwash can use the disturbance of air to the filter material layer and the shear force formed by the mutual collision and friction of the filter material to strip the attachments on the surface of the filter material, and the water backwash can expand or slightly expand the filter layer, so that the sewage in the filter layer can be discharged with low water flushing intensity, and the remaining falling dirt in the filter layer can be removed. Therefore, when cleaning the blockage, air backwash is performed first, the drain valve 91 is closed, the second valve 31 is opened, and compressed air is supplied to the second air supply pipe 3, the compressed air enters the first backwash branch pipes 33 through the first backwash main pipe 32, and is discharged from the air outlet holes to form air bubbles. The air bubbles can disturb the filter layer 16 in the rising process, loosen and carry away the impurities attached to the filter material. After a period of operation, air and water backwash are performed simultaneously, the third valve 41 is opened to supply clean water to the water supply pipe 4, the clean water enters the second backwash branch pipes 43 through the second backwash main pipe 42, and is discharged from the water outlet holes. The water flow from bottom to top passes through the infiltration tank 1 to wash the filtration layer 14, and the sewage is flushed out of the filtration layer 14. With the rising of the liquid level in the infiltration tank 1, the sewage is finally discharged from the overflow port 12 to the drainage channel 8. When the attachments on the filter material are basically stripped, the second valve 31 is closed, and water backwash is performed alone to flush out the attachments stripped from the filter material, and the cleaning of the blockage is completed.

[0036] Referring to Figure 1 , the infiltration tank 1 is provided with a water inlet main pipe 5 at the top, a plurality of water inlet branch pipes 51 are uniformly arranged on one side of the water inlet main pipe 5, and the other side of the water inlet main pipe 5 is connected to the sewage pipe 6 through the sewage valve 61 and connected to the clean water pipe 7 through the clean water valve 71; the overflow port 12 is arranged on the side of the infiltration tank 1 opposite to the water inlet main pipe 5, and the overflow port 12 is connected to the drainage channel 8. In the area far away from the overflow port 12, the water flow is slow due to the small kinetic energy of the water flow and the action of gravity. In order to ensure that the sewage for cleaning the filtration layer 14 is discharged as soon as possible, the sewage valve 61 is closed when cleaning the blockage, and the sewage entering the infiltration tank 1 is stopped, and the clean water valve 71 is opened, so that the clean water enters the infiltration tank 1 from the water inlet branch pipes 51, drives the water body far away from the overflow port 12, and accelerates the flow to the overflow port 12.

[0037] On the basis of the above-mentioned embodiments, due to the small diameter of the aeration holes, the aeration holes may be blocked after a long time of operation, resulting in an increase in the air pressure in the aeration main pipe 22 and the aeration branch pipe 25. In order to avoid the rupture of the aeration main pipe 22 and the aeration branch pipe 25 due to the excessively high air pressure, the aeration main pipe 22 is provided with an overflow pipe 23 communicating with the first backwashing main pipe 32, and the overflow pipe 23 is provided with an overflow valve 24. When the air pressure in the aeration main pipe 22 is excessively high, the overflow valve 24 is opened under the action of the air pressure, the gas enters the first backwashing main pipe 32 through the overflow pipe 23, and is discharged from the exhaust holes of the first backwashing branch pipe 33.

[0038] Further, when the thickness of the filter layer 16 is large, although the filtering effect can be improved, during the aeration backwashing, due to the large thickness, the distribution of the gas is affected, which easily leads to uneven aeration, and further affects the backwashing effect. Therefore, when the thickness of the filter layer 16 is large, the backwashing effect can be improved by multiple layers of aeration. For details, refer to Figure 6 The first aeration branch pipe 221 is located at the installation layer 17, and the second aeration branch pipe 222 is located at the middle position of the filter layer 16. Further, a layer of installation layer 17 can be additionally provided at the middle position of the filter layer 16, so that the second aeration branch pipe 222 is located in the installation layer 17, thereby providing support for the filter material of the filter layer 16, and facilitating the water and gas to pass through the installation layer 17 to clean the filter layer 16 during backwashing.

[0039] In another embodiment, referring to Figure 7 In order to improve the uniformity of the back aeration washing, the aeration branch pipe 25 can be designed as an F-shaped structure, the horizontal part of which is arranged at the installation layer 17, and the vertical part of which is inserted into the filter layer 16, thereby improving the uniformity of the back aeration washing of the filter layer 16.

[0040] Finally, it needs to be further explained that since the biofilm composed of microorganisms exists in the filter layer 16 of the constructed wetland, the biofilm contributes to water treatment. During water backwashing, if the impact force of the water flow is too strong, the biofilm may be scoured, and the microorganism living environment is disturbed. Therefore, during water backwashing, the strength of the water backwashing can be reduced, so that only clean water flow is continuously injected into the bottom of the infiltration tank 1, the water body in the infiltration tank 1 flows from bottom to top, the impurities washed by the back aeration washing are taken away from the filter layer 16 by the flow of the water body, and the disturbance to the biofilm is reduced.

[0041] Specific working process:

[0042] During normal operation, the sewage enters the infiltration tank 1 from the sewage pipe 6, and passes through the filter layer 14 from top to bottom, and is discharged from the drain pipe 9;

[0043] When the clogging is cleaned, the second valve 31 is opened to perform air backwashing on the filtration layer 14, and the air bubbles clean the filtration layer 14 from bottom to top. After a period of operation, the third valve 41 is opened to perform air and water backwashing on the filtration layer 14, and the water flow washes out the dirt in the filtration layer 14. Finally, the second valve 31 is closed to perform water backwashing, and the water flow washes out the dirt falling from the filter material, and the sewage is discharged to the drainage channel 8 through the overflow port 12.

[0044] Moreover, the air bubbles generated by air backwashing and the water flow generated by water backwashing pass through the aeration branch pipe 25 during the rising process, and the dirt attached to the aeration holes can be cleaned to ensure the normal operation of aeration.

[0045] Finally, it should be noted that the relationships, such as first and second, are only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term includes, includes or any other variant is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0046] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical application or improvement of the technology in the market of the embodiments, or to enable other ordinary skilled in the art to understand the embodiments disclosed herein.

Claims

1. An aeration backwashing device for reducing clogging of an artificial wetland infiltration tank, characterized by: The invention discloses a filtration tank, which comprises a hole plate (11), an aeration main pipe (22), an aeration branch pipe (25), a first backwashing main pipe (32), a first backwashing branch pipe (33), a second backwashing main pipe (42), and a second backwashing branch pipe (43). The hole plate (11) is installed at the bottom of the filtration tank (1) to divide the filtration tank (1) into two layers, i.e. a filtration layer (14) and a drainage layer (13). The aeration main pipe (22) is installed at the bottom of the filtration layer (14). The aeration main pipe (22) is uniformly provided with aeration branch pipes (25), and the aeration branch pipes (25) are uniformly provided with aeration holes. The aeration main pipe (22) is connected with a gas supply device through a first gas supply pipe (2). The first backwashing main pipe (32) is installed below the aeration main pipe (22). The first backwashing main pipe (32) is uniformly provided with first backwashing branch pipes (33) corresponding to the aeration branch pipes (25). The first backwashing branch pipes (33) are uniformly provided with exhaust holes. The first backwashing main pipe (32) is connected with the gas supply device through a second gas supply pipe (3). The second backwashing main pipe (42) is installed at the drainage layer (13). The second backwashing main pipe (42) is uniformly provided with second backwashing branch pipes (43) which are uniformly provided with drainage holes. The second backwashing main pipe (42) is connected with a water supply device through a water supply pipe (4).

2. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell according to claim 1, characterized in that: The filtration layer (14) is divided into a gravel layer (15), a filter layer (16), and an installation layer (17) from top to bottom. The aeration main pipe (22), the aeration branch pipe (25), the first backwashing main pipe (32), and the first backwashing branch pipe (33) are all installed at the installation layer (17).

3. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell of claim 1, wherein: A first valve (21) is installed on the first gas supply pipe (2). A second valve (31) is installed on the second gas supply pipe (3). A third valve (41) is installed on the water supply pipe (4).

4. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell of claim 1, wherein: An overflow pipe (23) is connected between the aeration main pipe (22) and the first backwashing main pipe (32). An overflow valve (24) is installed on the overflow pipe (23). The gas in the aeration main pipe (22) can enter the first backwashing main pipe (32) through the overflow valve (24).

5. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell of claim 1, wherein: A water inlet main pipe (5) is installed at the top of the filtration tank (1). A plurality of water inlet branch pipes (51) are uniformly arranged on one side of the water inlet main pipe (5). The other side of the water inlet main pipe (5) is connected with a sewage pipe (6) through a sewage valve (61) and connected with a clean water pipe (7) through a clean water valve (71).

6. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell of claim 5, wherein: An overflow port (12) is arranged on the side of the filtration tank (1) opposite to the water inlet main pipe (5). The overflow port (12) is connected with a drainage channel (8).

7. The aeration backwash device for reducing clogging of a constructed wetland infiltration cell of claim 1, wherein: A drainage pipe (9) is installed at the drainage layer (13). A drainage valve (91) is installed on the drainage pipe (9).

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