Wastewater biological treatment system

Abstract

The utility model discloses a wastewater biological treatment system, which comprises an aeration layer, an aeration layer, an aeration layer, a water tank and a water tank, wherein the aeration layer is provided with an air passing hole suitable for airflow to pass through; the biological sludge layer is located on the downstream of the aeration layer in the airflow flowing direction, the biological sludge layer and the aeration layer define a filler space sealed with the external space, and the filler space is communicated with the air passing hole; the biological filler layer is located in the filler space and is suitable for generating biological sludge, and the biological sludge in the filler space is suitable for blocking the air passing holes. According to the biological wastewater treatment system designed by the utility model, microorganisms can perform primary aerobic, primary anaerobic and secondary aerobic actions, and the treatment capacity and the treatment efficiency of the microorganisms on substances in wastewater can be improved, so that the treatment efficiency of the whole biological wastewater treatment system on the wastewater is improved.

Description

Technical Field

[0001] This utility model relates to the field of biological wastewater treatment, and in particular to a biological wastewater treatment system. Background Technology

[0002] In related technologies, wastewater biological treatment systems can use aerobic tanks to decompose wastewater. The biological packing layer in the aerobic tank contains many microorganisms. Under the action of microorganisms, organic matter in the wastewater can be decomposed into inorganic matter, and the treated wastewater can then be discharged. However, microorganisms need both oxygen and anaerobic environments to complete the biological treatment process when treating organic matter.

[0003] In some existing technologies, wastewater biological treatment systems use aeration pipes at the bottom of the tank to aerate the water. This method cannot provide both oxygen and anaerobic environments for microorganisms, making it difficult for them to efficiently treat wastewater and resulting in low efficiency of the wastewater biological treatment system. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a wastewater biological treatment system. The wastewater biological treatment system designed according to this invention enables microorganisms to perform primary aerobic, primary anaerobic, and secondary aerobic processes, which can improve the microorganisms' ability and efficiency in treating substances in wastewater, thereby improving the overall wastewater treatment efficiency of the wastewater biological treatment system.

[0005] The wastewater biological treatment system according to this utility model includes: an aeration layer, wherein the aeration layer is provided with air passage holes suitable for airflow; a biological sludge layer, wherein the biological sludge layer is located downstream of the aeration layer in the direction of airflow and defines a packing space that is closed to the outside space, the packing space being in communication with the air passage holes; and a biological packing layer, wherein the biological packing layer is located in the packing space and is suitable for generating biological sludge, the biological sludge in the packing space being suitable for blocking the air passage holes.

[0006] The wastewater biological treatment system of this utility model utilizes the combined action of an aeration layer, a biological sludge layer, and a biological packing layer to enable microorganisms in the system to undergo primary aerobic, primary anaerobic, and secondary aerobic processes. This improves the utilization rate of aeration in the aeration layer, significantly enhances the microorganisms' ability to treat COD and ammonia nitrogen in wastewater, and increases the treatment efficiency for COD and ammonia nitrogen. This results in stable denitrification of wastewater with improved denitrification efficiency, thereby enhancing the overall wastewater treatment efficiency of the biological treatment system.

[0007] According to some embodiments of the present invention, the biological sludge layer also forms an open opening that communicates with the packing space, the edge of the open opening is in contact with the aeration layer, and the projection of the edge of the open opening in the airflow direction coincides with the projection of the biological packing layer in the airflow direction.

[0008] According to some embodiments of the present invention, the biological filler layer includes a plurality of composite columns, on which biological filler is attached, and one end of the composite column is connected to the aeration layer, and the other end of the composite column extends in a direction away from the aeration layer, and the extension directions of at least two of the composite columns intersect.

[0009] According to some embodiments of the present invention, a plurality of composite columns together define an anaerobic layer on the inner side and a plurality of composite columns together define an aerobic layer on the outer side.

[0010] According to some embodiments of the present invention, the aeration layer is arranged in a surrounding manner and defines an aeration channel on its inner side, the aeration channel is connected to the air passage, and the biological packing layer is located on the outer side of the aeration layer.

[0011] According to some embodiments of the present invention, the biological packing layer includes: a first biological packing column and a second biological packing column, wherein the first biological packing column and the second biological packing column each include a plurality of the composite columns, and the first biological packing column and the second biological packing column are arranged at intervals along the axial and / or circumferential direction of the aeration layer.

[0012] According to some embodiments of the present invention, the end of the first biological packing column connected to the aeration layer and the end of the second biological packing column connected to the aeration layer are spaced apart along the axial direction of the aeration layer; the end of the first biological packing column away from the aeration layer and the end of the second biological packing column away from the aeration layer partially overlap.

[0013] According to some embodiments of the present invention, the wastewater biological treatment system further includes: a booster pump, which is adapted to pump airflow into the aeration channel.

[0014] According to some embodiments of the present invention, the wastewater biological treatment system further includes: a tank body, wherein the tank body is adapted to be provided with the aeration layer, the biological packing layer and the biological sludge layer, and the tank body is also formed with a wastewater inlet adapted to allow wastewater to be introduced into the tank body.

[0015] According to some embodiments of this utility model, the diameter of the air passage is no greater than 100 nm.

[0016] In summary, the wastewater biological treatment system of this invention, through the combined action of an aeration layer, a biological sludge layer, and a biological packing layer, enables the microorganisms in the wastewater biological treatment system to undergo primary aerobic, primary anaerobic, and secondary aerobic processes. This improves the utilization rate of aeration in the aeration layer, significantly enhances the microorganisms' ability to treat COD and ammonia nitrogen in wastewater, and increases the treatment efficiency of COD and ammonia nitrogen in wastewater. This allows for stable denitrification of wastewater with increased denitrification efficiency, thereby improving the overall wastewater treatment efficiency of the wastewater biological treatment system.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the wastewater biological treatment system according to an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the pool according to an embodiment of the present utility model.

[0021] Figure label:

[0022] 100. Wastewater biological treatment system;

[0023] 1. Aeration layer; 11. Aeration channel; 2. Biological sludge layer; 21. Packing space; 3. Biological packing layer; 31. Composite column; 32. Anaerobic layer; 33. Aerobic layer; 34. First biological packing column; 35. Second biological packing column; 4. Tank body; 41. Wastewater inlet. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In related technologies, wastewater biological treatment systems can use aerobic tanks to decompose wastewater. The biological packing layer in the aerobic tank contains many microorganisms. Under the action of microorganisms, organic matter in the wastewater can be decomposed into inorganic matter, and the treated wastewater can then be discharged. However, microorganisms need both oxygen and anaerobic environments to complete the biological treatment process when treating organic matter.

[0030] In some existing technologies, wastewater biological treatment systems use aeration pipes at the bottom of the tank to aerate the water. This method cannot provide both oxygen and anaerobic environments for microorganisms, making it difficult for them to efficiently treat wastewater and resulting in low efficiency of the wastewater biological treatment system.

[0031] The following is for reference. Figures 1-2 A wastewater biological treatment system 100 according to an embodiment of the present invention is described.

[0032] like Figure 2 As shown, the wastewater biological treatment system 100 according to this utility model includes: an aeration layer 1, a biological sludge layer 2, and a biological packing layer 3. The aeration layer 1 is provided with air passage holes suitable for airflow. The biological sludge layer 2 is located downstream of the aeration layer 1 in the direction of airflow and defines a packing space 21 that is closed to the outside space. The packing space 21 is connected to the air passage holes. The biological packing layer 3 is located in the packing space 21 and is suitable for generating biological sludge. The biological sludge in the packing space 21 is suitable for blocking the air passage holes.

[0033] Specifically, the aeration layer 1 and the biological sludge layer 2 provide a sealed packing space 21 for the biological packing layer 3. After wastewater is introduced into the wastewater biological treatment system 100, the microorganisms in the biological packing layer 3 can first treat the wastewater in an aerobic environment. After the biological sludge produced by the microorganisms blocks the air vents, the oxygen content in the packing space 21 is greatly reduced. At this time, the microorganisms can carry out biological treatment in a low-oxygen environment. Moreover, since the airflow entering the packing space 21 through the air vents can contact not only the biological packing layer 3 but also the biological sludge layer 2, the biological sludge layer 2 can temporarily store some oxygen. After working in an anaerobic environment, the microorganisms can then perform secondary treatment of the wastewater in an aerobic environment, thereby improving the treatment effect and efficiency of the wastewater biological treatment system 100. Furthermore, the biological sludge in the biological sludge layer 2 can also block the air vents during the biological treatment process.

[0034] More specifically, the vents are designed for airflow, which is typically clean air treated by a centrifugal air compressor to remove CO2. Wastewater containing COD and ammonia nitrogen is thoroughly distributed throughout the entire wastewater biological treatment system 100. Air is continuously injected into the aeration layer 1, and fine, continuous dissolved oxygen bubbles are aerated through the vents on the aeration layer 1, increasing the dissolved oxygen content of the entire wastewater biological treatment system 100. Sufficient oxygen in the biological packing layer 3 allows the microorganisms to perform their first aerobic respiration, decomposing COD into CO2 and H2O. Simultaneously, nitrifying bacteria nitrify ammonia nitrogen into nitrate nitrogen. The nitrate nitrogen penetrates into the biological packing material of the biological packing layer 3. Since the dissolved oxygen content in the biological packing material is low, denitrifying bacteria can convert nitrate nitrogen into nitrogen gas through denitrification. Then, the oxygen dissolved in the biological sludge layer 2 can be used by the biological packing layer 3, enabling the microorganisms to perform a second aerobic reaction, thus further treating the undecomposed COD and ammonia nitrogen, resulting in better COD and ammonia nitrogen treatment.

[0035] Here, the wastewater biological treatment system 100 can completely carry out multiple processes of aerobic-anaerobic-aerobic. The aeration effect is supplemented by the aeration layer 1, and the biological packing layer 3 and the biological sludge layer 2 are arranged downstream of the aeration layer 1 in the airflow direction. This allows the wastewater biological treatment system 100 to provide oxygen and also carry biological packing and biological sludge, ensuring that the wastewater biological treatment system 100 can complete the aeration process and the biological treatment process, thus forming a highly efficient wastewater biological treatment system 100.

[0036] According to this utility model, the wastewater biological treatment system 100, through the combined action of the aeration layer 1, the biological sludge layer 2, and the biological packing layer 3, enables the microorganisms in the wastewater biological treatment system 100 to carry out primary aerobic, primary anaerobic, and secondary aerobic processes, thereby improving the utilization rate of aeration in the aeration layer 1, greatly enhancing the microorganisms' ability to treat COD and ammonia nitrogen in wastewater, and improving the treatment efficiency of COD and ammonia nitrogen in wastewater. This allows for stable denitrification of wastewater with increased denitrification efficiency, thereby improving the overall wastewater treatment efficiency of the wastewater biological treatment system 100.

[0037] According to some embodiments of this utility model, such as Figure 2As shown, the biological sludge layer 2 also has an open opening communicating with the packing space 21. The edge of the open opening contacts the aeration layer 1, and the projection of the edge of the open opening in the airflow direction coincides with the projection of the biological packing layer 3 in the airflow direction. Specifically, the edge of the open opening contacts the aeration layer 1, thus defining a packing space 21 that is closed to the outside space, and also facilitating contact between the biological sludge layer 2 and the airflow to dissolve oxygen. The fact that the projection of the edge of the open opening in the airflow direction coincides with the projection of the biological packing layer 3 in the airflow direction increases the contact area between the biological packing layer 3 and the biological sludge layer 2, which is beneficial for secondary aerobic action and ensures that the wastewater biological treatment system 100 can complete the aeration and biological treatment processes, thereby improving the overall wastewater treatment efficiency of the wastewater biological treatment system 100.

[0038] According to some embodiments of this utility model, such as Figure 2 As shown, the biological packing layer 3 includes multiple composite columns 31, on which biological packing is attached. One end of the composite column 31 is connected to the aeration layer 1, and the other end of the composite column 31 extends away from the aeration layer 1. The extension directions of at least two composite columns 31 intersect, so that the multiple composite columns 31 can form a dense mesh column form in the packing space 21. The biological sludge layer 2 is attached to the composite columns 31. The structure of the biological packing layer 3 is designed as above, which can further increase the contact area between the biological packing layer 3 and the biological sludge layer 2.

[0039] According to some embodiments of this utility model, such as Figure 2 As shown, multiple composite columns 31 together define an anaerobic layer 32 on the inner side, and multiple composite columns 31 together define an aerobic layer 33 on the outer side. Specifically, the outer side of the biological packing is the aerobic layer 33, where nitrifying bacteria are located. The nitrifying bacteria nitrate ammonia nitrogen into nitrate nitrogen, which then penetrates into the biological packing layer 3. The dissolved oxygen content in the biological packing is low. The inner side of the biological packing is the anaerobic layer 32, where denitrifying bacteria are located. The denitrifying bacteria can convert nitrate nitrogen into nitrogen gas through denitrification. Here, dissolved oxygen bubbles aerated from aeration layer 1 enter the packing space 21 through air vents. The dissolved oxygen bubbles first come into contact with the aerobic layer 33 located on the outside of the biological packing. Nitrifying bacteria carry out biological action to consume oxygen. Furthermore, the biological sludge in biological sludge layer 2 and the biological sludge produced by microorganisms can block the air vents during the biological treatment process, thereby reducing the oxygen content in the packing space 21. This allows the microorganisms in the anaerobic layer 32 located inside the biological packing to carry out biological treatment, enabling the wastewater biological treatment system 100 to complete multiple biological treatment processes and improve the wastewater treatment efficiency of the wastewater biological treatment system 100.

[0040] According to some embodiments of this utility model, such as Figure 2As shown, the aeration layer 1 is arranged around and defines an aeration channel 11 on the inner side. The aeration channel 11 is connected to the air passage. The biological packing layer 3 is located on the outer side of the aeration layer 1. At this time, the airflow flows through the aeration channel 11 toward the air passage. The airflow flows from the inner side of the aeration layer 1 toward the outer side of the aeration layer 1.

[0041] According to some embodiments of this utility model, such as Figure 2 As shown, the biological packing layer 3 includes a first biological packing column 34 and a second biological packing column 35. The first biological packing column 34 and the second biological packing column 35 each include multiple composite columns 31, and the first biological packing column 34 and the second biological packing column 35 are spaced apart along the axial and / or circumferential direction of the aeration layer 1. Specifically, the first biological packing column 34 and the second biological packing column 35 can be spaced apart along the axial direction of the aeration layer 1, or they can be spaced apart circumferentially along the aeration layer 1, or they can be first spaced apart circumferentially in the aeration layer 1, and then staggered along the axial direction of the aeration layer 1.

[0042] In some embodiments, the first biological packing column 34 and the second biological packing column 35 are configured as a plurality of corresponding first biological packing columns 34, which are spaced apart circumferentially along the aeration layer 1, and the plurality of second biological packing columns 35 are spaced apart axially from the corresponding first biological packing columns 34 in the aeration layer 1.

[0043] According to some embodiments of this utility model, such as Figure 2 As shown, the end of the first biological packing column 34 connected to the aeration layer 1 and the end of the second biological packing column 35 connected to the aeration layer 1 are spaced apart along the axial direction of the aeration layer 1; the ends of the first biological packing column 34 away from the aeration layer 1 and the ends of the second biological packing column 35 away from the aeration layer 1 partially overlap, so that the biological sludge layer 2 is hung on the ends of the first biological packing column 34 and the second biological packing column 35 away from the aeration layer 1.

[0044] According to some embodiments of the present invention, the wastewater biological treatment system 100 also includes a booster pump, which is adapted to pump airflow into the aeration channel 11 so that the airflow has a high velocity and can enter the packing space 21 through the air passage.

[0045] According to some embodiments of this utility model, such as Figure 1As shown, the wastewater biological treatment system 100 also includes a tank 4, which is suitable for setting an aeration layer 1, a biological packing layer 3, and a biological sludge layer 2. The tank 4 also has a wastewater inlet 41 suitable for introducing wastewater into the tank 4. In some embodiments, organic wastewater containing COD and ammonia nitrogen is pumped into the tank 4, and the wastewater is fully distributed throughout the entire tank 4. First, pressurized air at 0.4 MPa-0.6 MPa is continuously pumped into the aeration layer 1, and fine and continuous dissolved oxygen bubbles are aerated through the air vents on the aeration layer 1 to ensure that the dissolved oxygen content of the entire tank 4 reaches more than 4 mg / L. Sufficient oxygen in the biological packing layer 3 enables the bacteria to carry out the first aerobic respiration to decompose COD into CO2 and H2O, while nitrifying bacteria decompose ammonia nitrogen. Nitrification converts nitrate nitrogen into nitrate nitrogen, which then penetrates into the biological packing material layer 3. The dissolved oxygen content in the anaerobic layer 32 at the center of the biological packing material is close to 0 mg / L. Denitrifying bacteria can convert nitrate nitrogen into nitrogen gas through denitrification. Then, the oxygen dissolved in the biological sludge layer 2 can be used by the biological packing material layer 3, enabling the microorganisms to carry out secondary aerobic action. This allows for secondary treatment of undecomposed COD and ammonia nitrogen, enabling the wastewater biological treatment system 100 to achieve a COD and ammonia nitrogen treatment efficiency of over 98%.

[0046] According to some embodiments of this utility model, the pore size of the air passage is no greater than 100 nm. In some embodiments, the aeration layer 1 is a MABR biofilm made of PVDF material, which can effectively isolate water and air. Air passage pores with a pore size of about 100 nm are formed on the biofilm. By using a novel combined packing material, the aeration efficiency is enhanced, so that the nanobubbles entering the packing space 21 through the air passage can continuously and densely dissolve oxygen in the wastewater, keeping the dissolved oxygen content stably above 4 mg / L. The aeration layer 1 can separate water and air, ensure the passage of oxygen, and under the action of a pressure pump, oxygen can be transported to the biological sludge, making the utilization rate of aeration higher. The biological sludge can be evenly distributed in the tank 4, so that the dissolved oxygen gas can be evenly contacted throughout the tank, thereby obtaining dissolved oxygen that meets the needs of the biological bacteria. This satisfies the oxygen content required for more complete aerobic action and nitrification activities of the biological bacteria, and enhances the aerobic action of the biological bacteria. In some embodiments, the pore size of the air passage is 100nm, and the aeration layer 1 performs nano-aeration, continuously updating the oxygen content in the tank 4, making the aerobic treatment efficiency of the wastewater biological treatment system 100 higher.

[0047] During the use of the wastewater biological treatment system 100, the pretreated organic wastewater can be collected first and then pumped into tank 4, as shown in Table 1:

[0048]

[0049] Table 1

[0050] As mentioned earlier, pressurized air at 0.4 MPa to 0.6 MPa can be continuously injected into aeration layer 1 to control the air-to-water ratio in tank 4 to be above 20:1, and the nanobubble aeration intensity can be controlled at 30 m³ / s. 3 / m 2 The aeration rate is above h, and the diameter of the nanobubbles is approximately 100 nm. Global aeration ensures that the dissolved oxygen (DO) concentration in the packing space 21 reaches above 10 mg / L, and the dissolved oxygen (DO) concentration in the biological sludge layer 2 reaches above 4 mg / L.

[0051] The oxygen in the packing space 21 is consumed for the first aerobic respiration of the microorganisms. Under aerobic conditions, microorganisms (such as bacteria) oxidize organic matter into carbon dioxide (CO2) and water (H2O) through respiration, releasing energy for their growth and reproduction. This process can be represented by the following chemical equation:

[0052] C x H y O z +aO2→bCO2+cH2O+energy

[0053] Among them, C x H y O z Representing organic compounds, a, b, and c are stoichiometric coefficients.

[0054] During the degradation of organic matter, microorganisms utilize some energy and organic matter to synthesize new cellular material. This process can be represented by the following biochemical equation:

[0055] C x H y O z +nO2+nNH3→nC5H7NO2+mCO2+pH2O

[0056] In this context, C5H7NO2 represents the basic components of a microbial cell, and n, m, and p are stoichiometric coefficients.

[0057] Under aerobic conditions, ammonia nitrogen is oxidized to nitrite (NO2-) and nitrate (NO3-). This process can be represented by the following chemical equation:

[0058] NH3 + 1.5O2 → NO2 - +H2O+H +

[0059] NO2 - +0.5O2→NO3 -

[0060] Nitrate nitrogen penetrates into the biological packing material layer 3. The dissolved oxygen content in the central anaerobic layer 32 of the biological packing material is close to 0 mg / L. Under anoxic conditions, nitrate is reduced to nitrogen gas (N2), thus achieving nitrogen removal. This process can be represented by the following chemical equation:

[0061] NO3- + organic matter → N2 + CO2 + H2O + OH- -

[0062] The oxygen dissolved in the biological sludge layer 2 can then be used by the biological packing layer 3, enabling the microorganisms to perform a secondary aerobic process. This allows for the secondary treatment of undecomposed COD and ammonia nitrogen. The chemical equations are as described in the primary aerobic process and will not be repeated here. After multiple treatments, the wastewater biological treatment system 100 achieves a treatment efficiency of over 98% for organic wastewater. See Table 2 for reference.

[0063]

[0064] Table 2

[0065] In summary, the wastewater biological treatment system 100 of this utility model, through the combined action of the aeration layer 1, the biological sludge layer 2, and the biological packing layer 3, enables the microorganisms in the wastewater biological treatment system 100 to carry out primary aerobic, primary anaerobic, and secondary aerobic processes. This improves the utilization rate of aeration in the aeration layer 1, greatly enhances the microorganisms' ability to treat COD and ammonia nitrogen in wastewater, and increases the treatment efficiency of COD and ammonia nitrogen in wastewater. This allows for stable denitrification of wastewater with improved denitrification efficiency, thereby improving the overall wastewater treatment efficiency of the wastewater biological treatment system 100.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0067] Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions and alterations can be made to the above embodiments.

Claims

1. A biological wastewater treatment system, characterized in that, include: An aeration layer (1) is provided with air passage holes suitable for airflow. Biological sludge layer (2), the biological sludge layer (2) is located downstream of the aeration layer (1) in the direction of airflow and defines a packing space (21) that is closed to the outside space with the aeration layer (1), the packing space (21) is connected to the air passage hole; A biological packing layer (3) is located in the packing space (21) and is adapted to generate biological sludge, wherein the biological sludge in the packing space (21) is adapted to block the air passages.

2. The wastewater biological treatment system according to claim 1, characterized in that, The biological sludge layer (2) also has an open opening that communicates with the packing space (21). The edge of the open opening is in contact with the aeration layer (1), and the projection of the edge of the open opening in the airflow direction coincides with the projection of the biological packing layer (3) in the airflow direction.

3. The wastewater biological treatment system according to claim 2, characterized in that, The biological filler layer (3) includes a plurality of composite columns (31), on which biological filler is attached, and one end of the composite column (31) is connected to the aeration layer (1), and the other end of the composite column (31) extends away from the aeration layer (1), and the extension directions of at least two of the composite columns (31) intersect.

4. The wastewater biological treatment system according to claim 3, characterized in that, The multiple composite columns (31) together define an anaerobic layer (32) on the inner side and an aerobic layer (33) on the outer side.

5. The wastewater biological treatment system according to claim 3, characterized in that, The aeration layer (1) is arranged around and defines an aeration channel (11) on its inner side. The aeration channel (11) is connected to the air passage. The biological packing layer (3) is located on the outer side of the aeration layer (1).

6. The wastewater biological treatment system according to claim 5, characterized in that, The biological packing layer (3) includes: The first biological packing column (34) and the second biological packing column (35) each include a plurality of the composite columns (31), and the first biological packing column (34) and the second biological packing column (35) are arranged at intervals along the axial and / or circumferential direction of the aeration layer (1).

7. The wastewater biological treatment system according to claim 6, characterized in that, The end of the first biological packing column (34) connected to the aeration layer (1) and the end of the second biological packing column (35) connected to the aeration layer (1) are spaced apart along the axial direction of the aeration layer (1); The end of the first biological packing column (34) away from the aeration layer (1) partially overlaps with the end of the second biological packing column (35) away from the aeration layer (1).

8. The wastewater biological treatment system according to claim 5, characterized in that, Also includes: A pressurizing pump adapted to pump airflow into the aeration channel (11).

9. The wastewater biological treatment system according to claim 1, characterized in that, Also includes: The pool body (4) is adapted to house the aeration layer (1), the biological packing layer (3) and the biological sludge layer (2), and the pool body (4) is also formed with a wastewater inlet (41) adapted to introduce wastewater into the pool body (4).

10. The wastewater biological treatment system according to claim 1, characterized in that, The diameter of the air passage is no greater than 100 nm.

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