An aerobic granular sludge screening reflux device

Abstract

This application provides an aerobic granular sludge screening and recirculation device, relating to the field of wastewater treatment technology. The aerobic granular sludge screening and recirculation device includes a first anaerobic tank, an aerobic tank, a first sedimentation tank, and a recirculation system. The recirculation system includes a first sludge collection pipe and a pressure pump assembly. The pressure pump assembly is configured to continuously extract aerobic granular sludge from the first sedimentation tank through the first sludge collection pipe and transport the aerobic granular sludge to the first anaerobic tank, thereby improving the efficiency of wastewater treatment in the first anaerobic tank, enhancing the continuity of the wastewater treatment process, simplifying the traditional aerobic granular sludge extraction pipeline setup, improving the collection efficiency of aerobic granular sludge in the first sludge collection pipe, and thus reducing costs.

Description

Technical Field

[0001] This application relates to wastewater treatment technology, and more particularly to an aerobic granular sludge screening and reflux device. Background Technology

[0002] Aerobic granular sludge (AGS) is a granular activated sludge formed through microbial self-aggregation. Compared with ordinary activated sludge, it is less prone to sludge bulking, has strong shock resistance, can withstand high organic loads, and integrates microorganisms with different properties (aerobic, facultative, and anaerobic microorganisms).

[0003] Currently, aerobic granular sludge is mostly produced intermittently, concentrated in a sequential batch reactor (SBR). The SBR reactor provides the growth environment for granular sludge formation and transports the aerobic granular sludge to the wastewater treatment line. Existing wastewater treatment plants are generally large-scale and typically have at least three SBR reactors to ensure continuous operation.

[0004] However, setting up multiple SBR reactors on the same wastewater treatment line increases the complexity of controlling the associated piping and auxiliary equipment, which in turn leads to increased costs. Summary of the Invention

[0005] In view of this, this application provides an aerobic granular sludge screening and reflux device, which aims to solve the problems of complex and costly preparation process of aerobic granular sludge in existing sewage treatment processes.

[0006] To achieve the above objectives, this application provides an aerobic granular sludge screening and reflux device, which adopts the following technical solution:

[0007] This application provides an aerobic granular sludge screening and reflux device for wastewater treatment, comprising a first anaerobic tank, an aerobic tank, a first sedimentation tank, and a reflux system;

[0008] The reflux system includes a first sludge collection pipe and a pressure pump assembly;

[0009] The first sedimentation tank has a first water distribution pipe, which is sleeved on the first sludge collection pipe and connects the aerobic tank and the first sedimentation tank.

[0010] The first anaerobic tank is connected to the aerobic tank. The first anaerobic tank is used to remove organic matter from the wastewater. The aerobic tank is used to denitrify the wastewater after the organic matter has been removed in the first anaerobic tank. The first sedimentation tank is used to settle the aerobic granular sludge after the wastewater has been denitrified in the aerobic tank.

[0011] The first sludge collection pipe is connected to the first sedimentation tank and the pressure pump assembly, and the pressure pump assembly is connected to the first anaerobic tank;

[0012] The pressure pump assembly is configured to continuously extract the aerobic granular sludge from the first sedimentation tank through the first sludge collection pipe and transport the aerobic granular sludge to the first anaerobic tank. At the same time, the wastewater in the aerobic tank flows into the first sedimentation tank through the first water distribution pipe.

[0013] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application further includes a second anaerobic tank and a second sedimentation tank.

[0014] The second anaerobic tank is located between the first anaerobic tank and the aerobic tank, and the second anaerobic tank is connected to the first anaerobic tank and the aerobic tank;

[0015] The second sedimentation tank has a second water distribution pipe, which connects the first sedimentation tank and the second sedimentation tank.

[0016] The reflux system also includes a second sludge collection pipe, and the pressure pump assembly is configured to be at least two. The first sludge collection pipe and the second sludge collection pipe are respectively connected to two different pressure pump assemblies. The second sludge collection pipe is connected to the second sedimentation tank, and the pressure pump assembly connected to the second sludge collection pipe is connected to the second anaerobic tank.

[0017] The pressure pump assembly is further configured to extract the aerobic granular sludge from the second sedimentation tank through the second sludge collection pipe and transport the aerobic granular sludge to the second anaerobic tank, while the wastewater in the first sedimentation tank flows to the second sedimentation tank through the second water distribution pipe.

[0018] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application has at least one of the first water distribution pipe, the second water distribution pipe, and the first sludge collection pipe being flared.

[0019] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application further includes a flow guide hood in the second sedimentation tank. The flow guide hood is installed at the outlet of the second water distribution pipe to guide the wastewater flowing out of the second water distribution pipe.

[0020] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application has a conical guide shroud with the tip of the guide shroud facing the second water distribution pipe.

[0021] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application includes a pressure chamber assembly, a reversing component, and a pressure pump body.

[0022] The reversing component is connected to the pressure chamber assembly and the pressure pump body via a pipeline assembly;

[0023] At least two of the pressure chamber assemblies are respectively connected to the first sludge collection pipe and the first anaerobic tank, and the second sludge collection pipe and the second anaerobic tank;

[0024] The reversing element is configured to change the flow direction of hydraulic oil within the reversing element so that the pressure chamber assembly continuously extracts and transports the aerobic granular sludge.

[0025] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application includes a first pressure chamber and a second pressure chamber in the pressure chamber assembly.

[0026] Both the first pressure chamber and the second pressure chamber have piston plates, which divide the first pressure chamber and the second pressure chamber into an oil chamber and a water chamber, respectively.

[0027] The oil tanks are all connected to the reversing components;

[0028] The water tanks of the first pressure chamber and the second pressure chamber of at least one of the pressure chamber assemblies are both connected to the first sludge collection pipe;

[0029] The water tanks of the first pressure chamber and the second pressure chamber of the other pressure chamber assembly are both connected to the second sludge collection pipe;

[0030] The water tanks of the first pressure chamber and the second pressure chamber, which are connected to the first sludge collection pipe, are both connected to the first anaerobic tank.

[0031] The water tanks of the first pressure chamber and the second pressure chamber, which are connected to the second sludge collection pipe, are both connected to the second anaerobic tank.

[0032] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application has two water inlets in each of the water tanks of the first pressure chamber and the second pressure chamber, and each water inlet connected to the same water tank is provided with a one-way valve in opposite directions.

[0033] In one possible implementation, the aerobic granular sludge screening and recirculation device provided in this application has at least two spaced-apart aeration discs and at least two flow guiding components in the aerobic tank.

[0034] The flow guiding component has a flow guiding upward channel;

[0035] Two adjacent flow guiding components have a gap, which forms a flow descending channel;

[0036] The aeration disc is configured to be positioned below the upward guide channel and to blow gas into the upward guide channel so that the wastewater in the upward guide channel rises and falls freely through the downward guide channel.

[0037] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application includes a first guide plate and a second guide plate as the flow guiding component;

[0038] The first and second guide plates of the same flow guiding component are arranged to form the flow guiding upward channel, and the first and second guide plates of adjacent flow guiding components that are close to each other are arranged to form the flow guiding downward channel.

[0039] Both ends of the first guide plate and the second guide plate have extended edges, which are arranged in the direction of the flow of the sewage.

[0040] The aerobic granular sludge screening and reflux device provided in this application consists of a first anaerobic tank, an aerobic tank, a first sedimentation tank, and a reflux system. The reflux system includes a first sludge collection pipe and a pressure pump assembly.

[0041] The first sedimentation tank has a first water distribution pipe, which connects the aerobic tank and the first sedimentation tank. The first water distribution pipe is sleeved on the first sludge collection pipe.

[0042] The first anaerobic tank is connected to the aerobic tank, the first sludge collection pipe is connected to the first sedimentation tank and the pressure pump assembly, and the pressure pump assembly is connected to the first anaerobic tank.

[0043] The pressure pump assembly is configured to continuously extract aerobic granular sludge from the first sedimentation tank through the first sludge collection pipe and transport the aerobic granular sludge to the first anaerobic tank. At the same time, the wastewater in the aerobic tank flows into the first sedimentation tank through the first water distribution pipe.

[0044] This allows for the continuous supply of aerobic granular sludge to the first anaerobic tank, improving the efficiency of wastewater treatment in the first anaerobic tank and enhancing the continuity of the wastewater treatment process.

[0045] In addition, the wastewater flowing out of the first distribution pipe will carry aerobic granular sludge, and the aerobic granular sludge will settle below the first distribution pipe. The way the first distribution pipe and the first sludge collection pipe are nested together makes it easy for the first sludge collection pipe to extract the aerobic granular sludge sediment. This simplifies the traditional aerobic granular sludge extraction pipeline setup, improves the aerobic granular sludge collection efficiency of the first sludge collection pipe, and thus reduces costs. This solves the problem of complex and costly preparation process of aerobic granular sludge in the existing wastewater treatment process.

[0046] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the technical solutions provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0047] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application, and this application is not limited to the specific embodiments described below.

[0048] Figure 1 A schematic diagram of the structure of an aerobic granular sludge screening and reflux device provided in an embodiment of this application;

[0049] Figure 2 To indicate Figure 1 A partial structural diagram of the first and second sedimentation tanks in the middle section;

[0050] Figure 3 To indicate Figure 1 Schematic diagram of the medium-pressure pump assembly;

[0051] Figure 4 To indicate Figure 3 A schematic diagram of the structure of the reversing component after switching directions;

[0052] Figure 5 To indicate Figure 1 A partial structural diagram of the intermediate aerobic tank.

[0053] Explanation of reference numerals in the attached figures:

[0054] 100. First anaerobic tank;

[0055] 200. Aerobic tank; 201. Upward guide channel; 202. Downward guide channel; 210. Aeration disc; 220. Guide assembly; 221. First guide plate; 222. Second guide plate;

[0056] 300. First sedimentation tank; 310. First water distribution pipe;

[0057] 400. Reflux system;

[0058] 410. First sludge collection pipe;

[0059] 420. Pressure pump assembly;

[0060] 421. Pressure chamber assembly; 4211. First pressure chamber; 4212. Second pressure chamber; 4213. Piston plate; 4214. Check valve;

[0061] 422. Commutator; 4221. Commutator plate; 4222. Commutator ring;

[0062] 423. Pressure pump body;

[0063] 430. Second sludge collection pipe;

[0064] 500. Second anaerobic tank;

[0065] 600. Second sedimentation tank;

[0066] 610. Second water distribution pipe;

[0067] 620. Fairing;

[0068] 630. Overflow outlet;

[0069] 700. Discharge pipe.

[0070] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0074] In the description of this application, "multiple" means two or more, unless otherwise specified precisely.

[0075] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0076] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0077] As mentioned in the background section, the preparation process of aerobic granular sludge in wastewater treatment is complex, and a large number of SBR reactors need to be set up on the same wastewater treatment line to achieve continuous operation of wastewater treatment. In addition, the control of supporting pipelines and auxiliary equipment is relatively complex and costly.

[0078] Aerobic granular sludge is granular activated sludge formed through microbial self-aggregation. Compared with ordinary activated sludge, it is less prone to sludge bulking, has strong shock resistance, can withstand high organic loads, and integrates microorganisms with different properties (aerobic, facultative, and anaerobic microorganisms).

[0079] Currently, aerobic granular sludge is widely used in wastewater treatment processes. However, when aerobic granular sludge is applied to continuous flow wastewater treatment processes, the cultivation of aerobic granular sludge presents several problems:

[0080] 1. Difficulty in Achieving Satiety-Starvation Conditions: One of the crucial conditions for the formation of aerobic granular sludge is the saturation-starvation theory. This involves creating a saturation period in the anaerobic stage, where a high food-to-microorganism ratio (food concentration / microorganism concentration) allows the sludge to absorb large amounts of organic matter from the wastewater. Conversely, a starvation period occurs in the aerobic stage, where a lower food-to-microorganism ratio allows the sludge to grow slowly through endogenous respiration, forming a relatively dense granular sludge structure. However, under continuous flow conditions, the dilution effect of the sludge return liquid leads to a low substrate concentration in the anaerobic section, making it difficult to achieve a high food-to-microorganism ratio. Consequently, the saturation-starvation conditions cannot be effectively established, hindering the favorable environment for granular sludge formation.

[0081] 2. Difficulty in Achieving Granular Sludge Return: Continuous flow processes naturally require sludge to be returned to the influent end to mix with wastewater and remove pollutants. Traditional sludge return pumps use impellers to transport sludge from the end of the sedimentation tank or biological treatment tank to the influent end. However, this method often results in significant breakage of granular sludge due to the cutting and collision effects of the impellers, leading to sludge degradation and system instability. Another method, using an airlift pump to transport granular sludge, results in a large amount of oxygen mixed in the sludge return liquid. This oxygen disrupts the anaerobic environment at the influent end, preventing the saturation process from occurring.

[0082] 3. Difficulty in screening and enriching granular sludge: The separation of sludge and water in the continuous flow process is mainly achieved through a continuous flow sedimentation tank. In this process, both aerobic granular sludge and flocculent sludge settle in the sludge hopper at the bottom of the sedimentation tank without separation. Further screening by engineering means (hydrocyclones or screens, etc.) is required, which increases the land area and energy consumption, and the effect is not ideal.

[0083] Currently, aerobic granular sludge is concentrated in intermittently operating SBR reactors, mainly because SBR reactors can easily achieve the saturation / starvation process of sludge, providing a growth environment for granular sludge formation. Simultaneously, SBR reactors can conveniently control the sludge settling selective pressure, enabling the screening and rapid enrichment of granular sludge. However, most actual wastewater treatment plants operate continuously and are large-scale. The increased complexity of controlling the piping and auxiliary equipment of SBR reactors leads to higher costs, making them difficult to apply to the treatment of smaller volumes of wastewater. Furthermore, they are not easily connected in series with other continuously operating structures.

[0084] Based on the above-mentioned technical problems, this application provides an aerobic granular sludge screening and reflux device. In this technical solution, a first anaerobic tank, an aerobic tank, a first sedimentation tank and a reflux system are set up. The reflux system includes a first sludge collection pipe and a pressure pump assembly.

[0085] The first sedimentation tank has a first water distribution pipe, which connects the aerobic tank and the first sedimentation tank. The first water distribution pipe is sleeved on the first sludge collection pipe.

[0086] The first anaerobic tank is connected to the aerobic tank, the first sludge collection pipe is connected to the first sedimentation tank and the pressure pump assembly, and the pressure pump assembly is connected to the first anaerobic tank.

[0087] The pressure pump assembly is configured to continuously extract aerobic granular sludge from the first sedimentation tank through the first sludge collection pipe and transport the aerobic granular sludge to the first anaerobic tank. At the same time, the wastewater in the aerobic tank flows into the first sedimentation tank through the first water distribution pipe.

[0088] This allows for the continuous supply of aerobic granular sludge to the first anaerobic tank, improving the efficiency of wastewater treatment in the first anaerobic tank and enhancing the continuity of the wastewater treatment process.

[0089] In addition, the wastewater flowing out of the first distribution pipe will carry aerobic granular sludge, and the aerobic granular sludge will settle below the first distribution pipe. The way the first distribution pipe and the first sludge collection pipe are nested together makes it easy for the first sludge collection pipe to extract the aerobic granular sludge sediment. This simplifies the traditional aerobic granular sludge extraction pipeline setup, improves the aerobic granular sludge collection efficiency of the first sludge collection pipe, and thus reduces costs. This solves the problem of complex and costly preparation process of aerobic granular sludge in the existing wastewater treatment process.

[0090] It should be noted that, Figures 1 to 5 This diagram illustrates a simplified representation of the components in the aerobic granular sludge screening and recirculation device. The specific structures of the remaining components in the aerobic granular sludge screening and recirculation device are not limited to these examples. Figures 1 to 5 of examples.

[0091] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0092] Reference Figure 1 and Figure 2 As shown in the embodiment of this application, an aerobic granular sludge screening and reflux device is provided for wastewater treatment. It should be noted that the aerobic granular sludge screening and reflux device provided in this application can be applied to the treatment of various types of wastewater and is not limited to any particular type of wastewater.

[0093] The aerobic granular sludge screening and reflux device includes a first anaerobic tank 100, an aerobic tank 200, a first sedimentation tank 300, and a reflux system 400.

[0094] The return system 400 includes a first sludge collection pipe 410 and a pressure pump assembly 420.

[0095] The first sedimentation tank 300 has a first water distribution pipe 310, which is sleeved on the first sludge collection pipe 410. The first water distribution pipe 310 connects the aerobic tank 200 and the first sedimentation tank 300.

[0096] The first anaerobic tank 100 is connected to the aerobic tank 200. The first anaerobic tank 100 is used to remove organic matter from the sewage. The aerobic tank 200 is used to denitrify the sewage after the organic matter has been removed in the first anaerobic tank 100. The first sedimentation tank 300 is used to settle the aerobic granular sludge after the sewage has been denitrified in the aerobic tank 200.

[0097] The first sludge collection pipe 410 connects the first sedimentation tank 300 and the pressure pump assembly 420, and the pressure pump assembly 420 connects the first anaerobic tank 100.

[0098] The pressure pump assembly 420 is configured to continuously extract aerobic granular sludge from the first sedimentation tank 300 through the first sludge collection pipe 410 and transport the aerobic granular sludge to the first anaerobic tank 100. At the same time, the sewage in the aerobic tank 200 flows to the first sedimentation tank 300 through the first water distribution pipe 310.

[0099] In the above embodiment, wastewater enters the first anaerobic tank 100 through the inlet. At this time, the aerobic granular sludge in the first sedimentation tank 300 is drawn out by the pressure pump assembly 420 through the first sludge collection pipe 410 and then enters the first anaerobic tank 100 together with the wastewater. In the first anaerobic tank 100, by creating a high food-to-microbe ratio (food concentration / microorganism concentration), the aerobic granular sludge absorbs a large amount of organic matter in the wastewater, thereby achieving the purpose of removing organic matter from the wastewater.

[0100] Here, the aerobic granular sludge is extracted using only the first sludge collection pipe 410, ensuring its integrity and eliminating the need for paddle conveying which could cause sludge breakage and system instability. Furthermore, no air is injected during the extraction process, maintaining an oxygen-deficient environment within the first anaerobic tank 100, thereby further improving the efficiency of wastewater organic matter absorption within the first anaerobic tank 100.

[0101] In this way, aerobic granular sludge is continuously transported into the first anaerobic tank 100, improving the efficiency of wastewater treatment in the first anaerobic tank 100 and enhancing the continuity of the wastewater treatment process.

[0102] In addition, the wastewater flowing out of the first water distribution pipe 310 will carry aerobic granular sludge, and the aerobic granular sludge will settle below the first water distribution pipe 310. The way in which the first water distribution pipe 310 and the first sludge collection pipe 410 are nested together makes it convenient for the first sludge collection pipe 410 to extract the aerobic granular sludge sediment. This simplifies the traditional aerobic granular sludge extraction pipeline setup, improves the aerobic granular sludge collection efficiency of the first sludge collection pipe 410, thereby reducing costs and solving the problem of complex and costly preparation process of aerobic granular sludge in the existing wastewater treatment process.

[0103] In practice, the first water distribution pipe 310 is installed at the top of the first sedimentation tank 300, so that the sewage flowing out of the first water distribution pipe 310 can flow into the first sedimentation tank 300 faster from the aerobic tank 200 under its own gravity.

[0104] In one possible implementation, the aerobic granular sludge screening and reflux device provided in this application further includes a second anaerobic tank 500 and a second sedimentation tank 600.

[0105] The second anaerobic tank 500 is located between the first anaerobic tank 100 and the aerobic tank 200, and the second anaerobic tank 500 is connected to the first anaerobic tank 100 and the aerobic tank 200.

[0106] The second sedimentation tank 600 has a second water distribution pipe 610, which connects the first sedimentation tank 300 and the second sedimentation tank 600.

[0107] The reflux system 400 also includes a second sludge collection pipe 430, and at least two pressure pump assemblies 420 are configured. The first sludge collection pipe 410 and the second sludge collection pipe 430 are respectively connected to two different pressure pump assemblies 420. The second sludge collection pipe 430 is connected to the second sedimentation tank 600, and the pressure pump assembly 420 connected to the second sludge collection pipe 430 is connected to the second anaerobic tank 500.

[0108] The pressure pump assembly 420 is also configured to extract aerobic granular sludge from the second sedimentation tank 600 through the second sludge collection pipe 430 and transport the aerobic granular sludge to the second anaerobic tank 500. At the same time, the sewage in the first sedimentation tank 300 flows to the second sedimentation tank 600 through the second water distribution pipe 610.

[0109] After the wastewater undergoes organic matter removal in the first anaerobic tank 100, it flows to the second anaerobic tank 500 to continue the organic matter removal process. The wastewater in the first sedimentation tank 300 flows to the second sedimentation tank 600, where aerobic granular sludge continues to settle. At this time, the aerobic granular sludge in the second sedimentation tank 600 is pumped out by the pressure pump assembly 420 through the second sludge collection pipe 430 and transported to the second anaerobic tank 500.

[0110] It is understandable that relatively high-purity aerobic granular sludge can be settled in the first sedimentation tank 300. The aerobic granular sludge transported to the first anaerobic tank 100 has high purity, ensuring a high food-to-microorganism ratio (food concentration / microorganism concentration), allowing the aerobic granular sludge to absorb a large amount of organic matter from the wastewater. The second sedimentation tank 600 further settles the aerobic granular sludge, which is then transported to the second anaerobic tank 500 to continue absorbing organic matter. This improves the sedimentation and screening efficiency of the aerobic granular sludge, effectively completing the screening process and avoiding waste of the prepared aerobic granular sludge.

[0111] In the above embodiment, the second water distribution pipe 610 is installed at the top of the second sedimentation tank 600 to facilitate the sedimentation of aerobic granular sludge.

[0112] Continue to refer to Figure 1 and Figure 2 As shown, at least one of the first water distribution pipe 310, the second water distribution pipe 610, and the first sludge collection pipe 410 is flared.

[0113] like Figure 2 As shown, the first water distribution pipe 310 has a flared opening. When the sewage in the first water distribution pipe 310 flows out from the flared opening, the flared opening can increase the flow area of ​​the sewage and slow down the flow rate of the sewage. At the same time, it can better settle the aerobic granular sludge in the sewage and reduce the impact of the sewage flow.

[0114] The first sludge collection pipe 410 is flared and coaxially arranged with the first water distribution pipe 310. It is understood that the sewage flow from the first water distribution pipe 310 will wash the outside of the flared opening of the first sludge collection pipe 410. The first sludge collection pipe 410 can further slow down the sewage flow and guide the sewage to the side wall of the first sedimentation tank 300, thereby improving the sedimentation efficiency of aerobic granular sludge.

[0115] The second water distribution pipe 610 has a flared opening. When the sewage in the second water distribution pipe 610 flows out from the flared opening, the flared opening can increase the flow area of ​​the sewage and slow down the flow rate of the sewage. At the same time, it can allow the aerobic granular sludge in the sewage to settle better and reduce the impact of the sewage flow.

[0116] In order to further improve the sedimentation efficiency of aerobic granular sludge in the second sedimentation tank 600, the second sedimentation tank 600 is also equipped with a guide hood 620. The guide hood 620 is set at the outlet of the second water distribution pipe 610 to guide the sewage flowing out of the second water distribution pipe 610.

[0117] Specifically, the guide hood 620 is conical, with its tip pointing towards the second water distribution pipe 610. The conical guide hood 620 can slow down the flow rate of sewage and guide the sewage to the side wall of the second sedimentation tank 600, thereby improving the sedimentation efficiency of aerobic granular sludge.

[0118] In another possible implementation, the inner bottom wall of at least one of the first sedimentation tank 300 and the second sedimentation tank 600 is funnel-shaped. On the one hand, the inclined funnel-shaped sidewall allows for better adhesion of aerobic granular sludge; on the other hand, when a large amount of aerobic granular sludge accumulates on the sidewall, it can slide down to the bottom of the funnel-shaped inner bottom wall of the first sedimentation tank 300 and the second sedimentation tank 600, effectively enriching the aerobic granular sludge. This structure is simple and can easily achieve the enrichment of aerobic granular sludge, facilitating the extraction of the settled aerobic granular sludge in the next step.

[0119] At the bottom of the funnel-shaped first sedimentation tank 300 and second sedimentation tank 600, there is also a waste discharge pipe 700. The waste discharge pipe 700 is used to discharge large impurities such as sand and gravel from the sedimentation, thereby further improving the purity of the aerobic granular sludge sedimentation.

[0120] An overflow outlet 630 is provided on the side wall of the second sedimentation tank 600. When the sewage volume increases dramatically, the sewage can be drained and depressurized through the overflow outlet 630 to avoid affecting the sewage treatment process due to the surge in water volume.

[0121] In one possible implementation, refer to Figure 1 , Figure 3 and Figure 4 As shown, the pressure pump assembly 420 includes a pressure chamber assembly 421, a reversing component 422, and a pressure pump body 423.

[0122] The reversing component 422 is connected to the pressure chamber assembly 421 and the pressure pump body 423 via a pipeline assembly.

[0123] At least two pressure chamber assemblies 421 are respectively connected to the first sludge collection pipe 410 and the first anaerobic tank 100, and the second sludge collection pipe 430 and the second anaerobic tank 500.

[0124] The reversing element 422 is configured to continuously draw and transport aerobic particulate sludge by changing the flow direction of hydraulic oil within the reversing element 422.

[0125] In the above embodiment, by changing the flow direction of the hydraulic oil in the reversing component 422, and in conjunction with the suction force provided by the pressure pump body 423, the pressure chamber assembly 421 continuously extracts and transports aerobic granular sludge. It can be understood that the aerobic granular sludge only flows within the pressure chamber assembly 421 and will not come into contact with the pressure pump assembly 420, thus protecting the aerobic granular sludge from damage and ensuring its integrity.

[0126] In one possible implementation, the pressure chamber assembly 421 includes a first pressure chamber 4211 and a second pressure chamber 4212.

[0127] Both the first pressure chamber 4211 and the second pressure chamber 4212 have piston plates 4213, which divide the first pressure chamber 4211 and the second pressure chamber 4212 into an oil chamber and a water chamber, respectively.

[0128] All oil tanks are connected to the reversing component 422.

[0129] The water tanks of the first pressure tank 4211 and the second pressure tank 4212 of at least one pressure tank assembly 421 are both connected to the first sludge collection pipe 410.

[0130] The water tanks of the first pressure tank 4211 and the second pressure tank 4212 of another pressure tank assembly 421 are both connected to the second sludge collection pipe 430.

[0131] The water tanks of the first pressure chamber 4211 and the second pressure chamber 4212, which are connected to the first sludge collection pipe 410, are both connected to the first anaerobic tank 100.

[0132] The water tanks of the first pressure chamber 4211 and the second pressure chamber 4212, which are connected to the second sludge collection pipe 430, are both connected to the second anaerobic tank 500.

[0133] In the above embodiment, the pressure pump body 423 always provides suction force in one direction. The piston plate 4213 in the first pressure chamber 4211 and the second pressure chamber 4212 alternately rises and falls through the reversing component 422. This causes the water chambers of the first pressure chamber 4211 and the second pressure chamber 4212, which are connected to the first sludge collection pipe 410, to alternately draw aerobic granular sludge from the first sedimentation tank 300. Similarly, the water chambers of the first pressure chamber 4211 and the second pressure chamber 4212, which are connected to the second sludge collection pipe 430, alternately draw aerobic granular sludge from the second sedimentation tank 600. The sludge is then transported to the first anaerobic tank 100 and the second anaerobic tank 500, which is equivalent to continuously supplying aerobic granular sludge to the first anaerobic tank 100 and the second anaerobic tank 500, thus achieving a continuous supply of aerobic granular sludge.

[0134] In practice, in order to ensure the continuity of the aerobic granular sludge extraction process, the water tank of the first pressure chamber 4211 and the water tank of the second pressure chamber 4212 each have two water inlets, and each water inlet connected to the same water tank is equipped with a one-way valve 4214 in opposite directions.

[0135] By adding a one-way valve 4214, it is possible to ensure that the two water inlets in the water tanks of the first pressure tank 4211 and the second pressure tank 4212 alternately perform extraction and transportation operations, thereby ensuring a continuous supply of aerobic granular sludge to the first anaerobic tank 100 and the second anaerobic tank 500 and preventing sludge backflow.

[0136] In specific implementation, refer to Figure 3 and Figure 4 As shown, the commutator 422 includes a drive member (not shown in the figure) that provides power, a commutator disk 4221 connected to the drive member, and a commutator ring 4222 sleeved on the outside of the commutator disk 4221.

[0137] The commutator ring 4222 has eight first connection holes along its circumferential side, such as Figure 5 As shown in Figures A, B, C, D, E, F, G, and H. Each first connecting hole is oriented towards the axis of the reversing ring 4222 and is coaxial in pairs, namely AE, BF, CG, and DH.

[0138] Two interlocking second connecting holes are radially formed inside the commutator 4221, such as... Figure 5 In the diagram, 'a' and 'b' are connected by a second connecting hole that links two coaxial first connecting holes. Figure 5 As shown, a is connected to BF, and b is connected to DH.

[0139] The driving component drives the commutator 4221 to rotate, thereby switching the connection between the second connecting hole and two coaxial first connecting holes of different groups. That is, after the commutator 4221 rotates, a connects to AE and b connects to CG.

[0140] Each oil tank has an oil outlet and an oil inlet, and each oil outlet and inlet is connected to a different set of first connection holes, such as... Figure 3 The holes K, L, M, and N are connected to each other. K connects to A, L connects to D, M connects to C, and N connects to B. The other first connection hole in the group is also connected to the pressure pump body 423. That is, E, F, G, and H are all connected to the pressure pump body 423.

[0141] In the above configuration, the pressure pump body 423 always provides a suction force in one direction, such as Figure 3The medium-pressure pump body 423 always provides suction force in the direction indicated by the X arrow. At this time, the flow direction of the hydraulic oil in the oil tank of the second pressure chamber 4212 is MCbG-pressure pump body 423-EaAK. This causes the piston plate 4213 in the second pressure chamber 4212 to move upward, so that the water tank of the second pressure chamber 4212 draws aerobic granular sludge. At the same time, it causes the piston plate 4213 in the first pressure chamber 4211 to move downward, so that the water tank of the first pressure chamber 4211 transports aerobic granular sludge.

[0142] When the reversing disc 4221 rotates, a connects to BF, and b connects to DH. The pressure pump body 423 always provides suction force in the direction indicated by the X arrow. That is, the flow direction of the hydraulic oil in the oil tank of the first pressure chamber 4211 is LDbH-pressure pump body 423-FaBN. The reverse movement of the piston plates 4213 ensures the continuous output of aerobic granular sludge from the water tank.

[0143] In one possible implementation, refer to Figure 1 and Figure 5 As shown, the aerobic tank 200 has at least two spaced aeration discs 210 and at least two flow guiding components 220.

[0144] The flow guiding component 220 has a flow guiding upward channel 201.

[0145] Two adjacent flow guiding components 220 have a gap, which forms a flow guiding descent channel 202.

[0146] The aeration disc 210 is configured to be positioned below the guide rise channel 201 and to blow gas into the guide rise channel 201 so that the sewage in the guide rise channel 201 rises and falls freely through the guide fall channel 202.

[0147] In the above embodiment, the aeration disc 210 can supply gas to the aerobic tank 200. The gas can be air or oxygen, and there is no restriction on the type of gas, as long as the aerobic tank 200 can complete the denitrification treatment of the wastewater.

[0148] Aeration discs 210 are positioned below the upward guide channel 201 and blow gas into it, causing the wastewater in the upward guide channel 201 to rise and then freely descend through the downward guide channel 202. It can be understood that as the wastewater rises in the upward guide channel 201, the ammonia-oxidizing bacteria on the outer layer of the aerobic granular sludge use oxygen to oxidize ammonia nitrogen in the wastewater into nitrate. Meanwhile, the heterotrophic denitrifying bacteria on the inner layer of the aerobic granular sludge utilize stored organic matter and residual organic matter in the wastewater to carry out denitrification under anoxic conditions, achieving simultaneous nitrification-denitrification nitrogen removal. The dissolved oxygen concentration is high in the upward guide channel 201 and low in the downward guide channel 202. The wastewater flows alternately between the upward and downward guide channels 201 and 202, creating a simple alternation between aerobic and anoxic environments, thus improving the efficiency of nitrification-denitrification nitrogen removal.

[0149] Specifically, the flow guiding component 220 includes a first flow guiding plate 221 and a second flow guiding plate 222.

[0150] The first guide plate 221 and the second guide plate 222 of the same flow guiding component 220 are arranged to form a flow guiding upward channel 201, and the first guide plate 221 and the second guide plate 222 of adjacent flow guiding components 220 that are close to each other are arranged to form a flow guiding downward channel 202.

[0151] The first guide plate 221 and the second guide plate 222 both have extended edges at their opposite ends, and the extended edges are arranged in the direction of sewage flow.

[0152] It is understandable that by making full use of the first guide plate 221 and the second guide plate 222 arranged at intervals to form the upward guide channel 201 and the downward guide channel 202, the structure is simple and the manufacturing cost is low.

[0153] Furthermore, both ends of the first guide plate 221 and the second guide plate 222 have extended edges, which are arranged in the direction of sewage flow, as shown in the reference. Figure 5 As shown, the extension edge can be an inclined plate-shaped extension edge or an arc-shaped extension edge. There are no restrictions on the specific structure of the extension edge. It is only necessary to set the extension edge in the direction of sewage flow. The extension edge has a guiding effect on the flow of sewage, which facilitates the alternating flow of sewage in the guide upward channel 201 and the guide downward channel 202.

[0154] The implementation principle of an aerobic granular sludge screening and reflux device according to an embodiment of this application is as follows: A first anaerobic tank 100, an aerobic tank 200, a first sedimentation tank 300, and a reflux system 400 are set up. The reflux system 400 includes a first sludge collection pipe 410 and a pressure pump assembly 420. The first sedimentation tank 300 has a first water distribution pipe 310, which connects the aerobic tank 200 and the first sedimentation tank 300. The first water distribution pipe 310 is sleeved on the first sludge collection pipe 410. The aerobic tank 100 is connected to the aerobic tank 200. The first sludge collection pipe 410 is connected to the first sedimentation tank 300 and the pressure pump assembly 420. The pressure pump assembly 420 is connected to the first anaerobic tank 100. The pressure pump assembly 420 is configured to continuously extract aerobic granular sludge from the first sedimentation tank 300 through the first sludge collection pipe 410 and transport the aerobic granular sludge to the first anaerobic tank 100. At the same time, the sewage in the aerobic tank 200 flows to the first sedimentation tank 300 through the first water distribution pipe 310.

[0155] In this way, aerobic granular sludge can be continuously delivered into the first anaerobic tank 100, improving the efficiency of wastewater treatment in the first anaerobic tank 100 and enhancing the continuity of the wastewater treatment process.

[0156] Furthermore, the wastewater flowing out of the first distribution pipe 310 carries aerobic granular sludge, which settles below the first distribution pipe 310. The way the first distribution pipe 310 and the first sludge collection pipe 410 are connected together makes it convenient for the first sludge collection pipe 410 to extract the aerobic granular sludge sediment. This simplifies the traditional method of setting up aerobic granular sludge extraction pipes, improves the collection efficiency of aerobic granular sludge in the first sludge collection pipe 410, thereby reducing costs and solving the problem of complex and costly preparation process of aerobic granular sludge in existing wastewater treatment processes.

[0157] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein.

[0158] This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The description and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0159] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An aerobic granular sludge screening and reflux device for wastewater treatment, characterized in that, include: The first anaerobic tank, aerobic tank, first sedimentation tank, and reflux system; The reflux system includes a first sludge collection pipe and a pressure pump assembly; The first sedimentation tank has a first water distribution pipe, which is sleeved on the first sludge collection pipe and connects the aerobic tank and the first sedimentation tank. The first anaerobic tank is connected to the aerobic tank. The first anaerobic tank is used to remove organic matter from the wastewater. The aerobic tank is used to denitrify the wastewater after the organic matter has been removed in the first anaerobic tank. The first sedimentation tank is used to settle the aerobic granular sludge after the wastewater has been denitrified in the aerobic tank. The first sludge collection pipe is connected to the first sedimentation tank and the pressure pump assembly, and the pressure pump assembly is connected to the first anaerobic tank; The pressure pump assembly is configured to continuously extract the aerobic granular sludge from the first sedimentation tank through the first sludge collection pipe and transport the aerobic granular sludge to the first anaerobic tank. At the same time, the wastewater in the aerobic tank flows into the first sedimentation tank through the first water distribution pipe. The pressure pump assembly includes a pressure chamber assembly, a reversing element, and a pressure pump body; the reversing element connects the pressure chamber assembly and the pressure pump body via a pipeline assembly; one of the at least two pressure chamber assemblies is used to connect the first sludge collection pipe and the first anaerobic tank; the reversing element is configured to change the flow direction of hydraulic oil within the reversing element so that the pressure chamber assembly continuously extracts and transports the aerobic granular sludge; the aerobic granular sludge only circulates within the pressure chamber assembly of the pressure pump assembly to ensure the integrity of the aerobic granular sludge; The pressure chamber assembly includes a first pressure chamber and a second pressure chamber; both the first pressure chamber and the second pressure chamber have piston plates, which divide the first pressure chamber and the second pressure chamber into an oil tank and a water tank, respectively; the oil tanks are all connected to the reversing component; The water tanks of the first pressure chamber and the second pressure chamber of at least one of the pressure chamber assemblies are both connected to the first sludge collection pipe; the water tanks of the first pressure chamber and the second pressure chamber, which are connected to the first sludge collection pipe, are both connected to the first anaerobic tank; the pressure pump body always provides suction force in one direction. The water tank of the first pressure chamber and the water tank of the second pressure chamber each have two water inlets, and each water inlet connected to the same water tank is provided with a one-way valve in opposite directions.

2. The aerobic granular sludge screening and reflux device according to claim 1, characterized in that, It also includes a second anaerobic tank and a second sedimentation tank; The second anaerobic tank is located between the first anaerobic tank and the aerobic tank, and the second anaerobic tank is connected to the first anaerobic tank and the aerobic tank; The second sedimentation tank has a second water distribution pipe, which connects the first sedimentation tank and the second sedimentation tank. The reflux system also includes a second sludge collection pipe, and the pressure pump assembly is configured to be at least two. The first sludge collection pipe and the second sludge collection pipe are respectively connected to two different pressure pump assemblies. The second sludge collection pipe is connected to the second sedimentation tank, and the pressure pump assembly connected to the second sludge collection pipe is connected to the second anaerobic tank. The pressure pump assembly is further configured to extract the aerobic granular sludge from the second sedimentation tank through the second sludge collection pipe and transport the aerobic granular sludge to the second anaerobic tank, while the wastewater in the first sedimentation tank flows to the second sedimentation tank through the second water distribution pipe.

3. The aerobic granular sludge screening and reflux device according to claim 2, characterized in that, At least one of the first water distribution pipe, the second water distribution pipe, and the first sludge collection pipe is flared.

4. The aerobic granular sludge screening and reflux device according to claim 3, characterized in that, The second sedimentation tank also has a flow guide hood, which is installed at the outlet of the second water distribution pipe to guide the sewage flowing out of the second water distribution pipe.

5. The aerobic granular sludge screening and reflux device according to claim 4, characterized in that, The flow guide is conical, with its tip pointing toward the second water distribution pipe.

6. The aerobic granular sludge screening and reflux device according to claim 2, characterized in that, At least one of the two pressure chamber assemblies is used to connect the second sludge collection pipe to the second anaerobic tank.

7. The aerobic granular sludge screening and reflux device according to claim 6, characterized in that, The water tanks of the first pressure chamber and the second pressure chamber of the other pressure chamber assembly are both connected to the second sludge collection pipe; The water tanks of the first pressure chamber and the second pressure chamber, which are connected to the second sludge collection pipe, are both connected to the second anaerobic tank.

8. The aerobic granular sludge screening and reflux device according to any one of claims 1 to 7, characterized in that, The aerobic tank has at least two aeration discs spaced apart and at least two flow guiding components. The flow guiding component has a flow guiding upward channel; Two adjacent flow guiding components have a gap, which forms a flow descending channel; The aeration disc is configured to be positioned below the upward guide channel and to blow gas into the upward guide channel so that the wastewater in the upward guide channel rises and falls freely through the downward guide channel.

9. The aerobic granular sludge screening and reflux device according to claim 8, characterized in that, The flow guiding assembly includes a first flow guiding plate and a second flow guiding plate; The first and second guide plates of the same flow guiding component are arranged to form the flow guiding upward channel, and the first and second guide plates of adjacent flow guiding components that are close to each other are arranged to form the flow guiding downward channel. Both ends of the first guide plate and the second guide plate have extended edges, which are arranged in the direction of the flow of the sewage.

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