Aerobic device, control method, and wastewater treatment system

Abstract

The embodiment of the present application provides an aerobic device, a control method and a sewage treatment system, and relates to the technical field of sewage treatment. The aerobic device provided by the embodiment comprises two aerobic tanks. The two aerobic tanks are arranged at intervals, each aerobic tank comprises a reaction zone, a separation zone, a defoaming pipeline, a power pump and a connecting pipeline, the defoaming pipeline is arranged at the top of the reaction zone and is used for eliminating foam in the reaction zone, the power pump is arranged in the separation zone, the power pump is used for conveying sludge-containing mixed liquor in the separation zone to the defoaming pipeline, one end of the connecting pipeline is communicated with the defoaming pipeline, the connecting pipeline in the aerobic tank is overlapped on the reaction zone of the other aerobic tank, and the connecting pipeline is used for transferring the mixed liquor in the defoaming pipeline communicated with the connecting pipeline to the reaction zone in the other aerobic tank. The connecting pipeline extracts sludge-containing mixed liquor in the separation zone of the other aerobic tank through the power pump and guides the mixed liquor to the fault reaction zone, so that the microbial strains in the fault reaction zone are supplemented.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to an aerobic device, a control method, and a wastewater treatment system. Background Technology

[0002] Coking wastewater, a typical type of high-concentration, highly toxic, and recalcitrant industrial wastewater, relies heavily on aerobic tanks in its biological treatment systems for pollutant degradation. During aerobic biological treatment, aeration is required to supply oxygen to the aerobic organisms, resulting in the generation of significant amounts of foam in the aerobic tanks.

[0003] The inventors discovered that in existing dual-pool aerobic devices, the two defoaming devices operate independently and lack linkage, resulting in limited functionality. Summary of the Invention

[0004] The present invention aims to provide an aerobic device, a control method, and a wastewater treatment system that can solve the technical problems mentioned in the background section.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, embodiments of the present invention provide an aerobic device comprising two aerobic tanks. The two aerobic tanks are spaced apart, and each aerobic tank includes a reaction zone, a separation zone, a defoaming pipeline, a power pump, and a connecting pipeline. The bottoms of the reaction zone and the separation zone are interconnected. The defoaming pipeline is located at the top of the reaction zone and is used to eliminate foam within the reaction zone. The power pump is located within the separation zone and is connected to the defoaming pipeline. The power pump is used to transport a mixture containing sludge from the separation zone to the defoaming pipeline. One end of the connecting pipeline is connected to the defoaming pipeline. The connecting pipeline in one aerobic tank overlaps the reaction zone of the other aerobic tank, and the connecting pipeline is used to transfer the mixture in the defoaming pipeline connected to it to the reaction zone of the other aerobic tank.

[0006] Furthermore, the aerobic device also includes two first control valves, which are respectively installed on the two connecting pipelines.

[0007] Furthermore, the defoaming pipeline includes an inlet pipe, a ring main pipe, and multiple branch pipes. One end of the inlet pipe is connected to the power pump, and the other end is connected to the ring main pipe. Multiple branch pipes are spaced apart on the ring main pipe. The ring main pipe is horizontally positioned inside the top of the reaction zone and has a predetermined distance between it and the top wall of the reaction zone.

[0008] Furthermore, the connecting pipe is located in the middle of the annular main pipe.

[0009] Furthermore, the defoaming pipeline also includes multiple second control valves, with one second control valve respectively provided on each of the opposite sides of each annular main pipe.

[0010] Furthermore, each of the separation zones is provided with a return port at the bottom, through which the sludge in the separation zone is returned to the reaction zone, and the power pump is located at the bottom of the separation zone.

[0011] Furthermore, each of the reaction zones is also equipped with a detection device, which is used to detect the operational index data within the reaction zone.

[0012] Secondly, embodiments of the present invention also provide a control method for an aerobic device, applied to the aerobic device provided in the first aspect embodiment above, the control method comprising: Obtain the operational index data of the test specimens, and determine the operational status of the reaction zones in the two aerobic tanks based on the operational index data; If the operating index data of the reaction zone in one of the aerobic tanks is lower than the preset index data, the first control valve in the other aerobic tank is opened until the operating index data of the reaction zone is equal to the preset index data, at which point the first control valve is closed.

[0013] Furthermore, if the operational index data of a reaction zone in one of the aerobic tanks is lower than the preset index data, it also includes: The two second control valves in another aerobic tank are closed until the operating index data of the reaction zone equals the preset index data, at which point the two second control valves are opened.

[0014] Thirdly, embodiments of the present invention also provide a wastewater treatment system, including the aerobic device provided in the first aspect embodiment above.

[0015] The beneficial effects of the aerobic device, control method, and wastewater treatment system provided in the embodiments of the present invention include: The aerobic device provided in this embodiment of the invention includes two aerobic tanks. The two aerobic tanks are arranged at an interval. Each aerobic tank includes a reaction zone, a separation zone, a defoaming pipeline, a power pump, and a connecting pipeline. The bottoms of the reaction zone and the separation zone are interconnected. The defoaming pipeline is located at the top of the reaction zone and is used to eliminate foam in the reaction zone. The power pump is located in the separation zone and is connected to the defoaming pipeline. The power pump is used to transport the mixed liquid containing sludge in the separation zone to the defoaming pipeline. One end of the connecting pipeline is connected to the defoaming pipeline. The connecting pipeline in one aerobic tank overlaps the reaction zone of the other aerobic tank, and the connecting pipeline is used to transfer the mixed liquid in the defoaming pipeline connected to it to the reaction zone of the other aerobic tank.

[0016] In this embodiment, when the two aerobic tanks are in normal operation, the two aerobic tanks operate independently. The defoaming pipeline pumps the sludge-containing mixed liquor in the separation zone through a power pump to spray and defoam the foam in the reaction zone. When the reaction zone of one aerobic tank fails with decreased sludge settling ratio and reduced microbial degradation efficiency due to water quality impact, abnormal working conditions and other reasons, the communication pipeline pumps the sludge-containing mixed liquor from the separation zone of the other aerobic tank through the power pump, and drains the mixed liquor into the faulty reaction zone, so as to supplement microbial strains in the faulty reaction zone. In this embodiment, the defoaming pipeline can not only perform spray defoaming, but also pump the sludge-containing mixed liquor from the separation zone of the other aerobic tank through the communication pipeline when the reaction zone in one aerobic tank fails due to decreased sludge settling ratio, thereby realizing linkage between the defoaming pipelines of the two aerobic tanks. Description of Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the accompanying drawings required for the embodiments. It should be understood that the following accompanying drawings only show certain embodiments of the present invention, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other relevant accompanying drawings can be obtained based on these accompanying drawings without creative effort.

[0018] Figure 1 is a structural schematic diagram of an aerobic device provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a separation zone provided by an embodiment of the present application; Figure 3 is a flow schematic diagram of a control method provided by another embodiment of the present application.

[0019] Description of reference numerals: 1-aerobic tank; 101-reaction zone; 1011-detection piece; 102-separation zone; 1021-reflux port; 103-defoaming pipeline; 1031-water inlet pipe; 1032-annular main pipe; 1033-branch pipe; 1034-second control valve; 104-power pump; 105-communication pipeline; 2-first control valve. Detailed Description of Embodiments

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the accompanying drawings herein can be arranged and designed in a variety of different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention.

[0024] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0026] A wastewater treatment system is a comprehensive engineering facility network that organically combines physical, chemical, and biological treatment units. Its core task is to remove various pollutants from domestic sewage or industrial wastewater, purify the water, and ultimately meet the prescribed discharge standards or achieve reuse.

[0027] For example, when using a wastewater treatment system to treat coking wastewater, a typical high-concentration, highly toxic, and recalcitrant industrial wastewater, the aerobic tank in the biological treatment system is the core unit for pollutant degradation. In engineering projects, a parallel operation mode of two tanks (north and south) is often adopted to ensure wastewater treatment load and efficiency. Currently, both tanks use a self-circulating spray defoaming method with the original wastewater from the tank. This means each tank has its own independent defoaming pipeline, drawing wastewater from the tank to achieve in-situ defoaming. The defoaming pipelines of the two tanks are independent of each other and have no interconnecting control structure.

[0028] In actual operation, the single-sided aerobic tank is highly susceptible to factors such as fluctuations in influent water quality, impacts from toxic and harmful substances, and abnormal operating conditions, which can lead to problems such as a sharp drop in sludge settling ratio, disintegration of activated sludge flocs, and decline in microbial activity. This can result in a significant reduction in wastewater degradation efficiency. If not dealt with in a timely manner, it can directly cause the collapse of the biological system and exceed the standards for effluent quality.

[0029] Traditional methods for handling abnormal sludge in a single aerobic tank mainly involve adding purchased activated sludge, restarting the microbial cultivation process by separate aeration, reducing the system's operating load, or even shutting down for rectification. These methods have drawbacks such as long microbial recovery cycles, high costs of purchased sludge, significant production losses due to shutdowns, and poor system stability. At the same time, existing independent defoaming pipelines only have a single defoaming function, resulting in low facility utilization and an inability to achieve emergency allocation of microbial strains between the two tanks. This makes it difficult to quickly respond to sludge inactivation faults and affects the continuous and stable operation of the entire coking wastewater treatment system.

[0030] To address the aforementioned technical problems, the following detailed description, through embodiments and in conjunction with accompanying drawings, details the overall structure, working principle, and technical effects of the aerobic device provided by the present invention, as well as the detailed steps, implementation principles, and technical effects of the supporting control method.

[0031] Please refer to Figure 1 This invention provides an aerobic device comprising two aerobic tanks 1. Two aerobic tanks 1 are arranged alternately. Each aerobic tank 1 includes a reaction zone 101, a separation zone 102, a defoaming pipe 103, a power pump 104, and a connecting pipe 105. The bottoms of the reaction zone 101 and the separation zone 102 are interconnected. The defoaming pipe 103 is located at the top of the reaction zone 101 and is used to eliminate foam in the reaction zone 101. The power pump 104 is located in the separation zone 102 and is connected to the defoaming pipe 103. The power pump 104 is used to transport the mixed liquor containing sludge in the separation zone 102 to the defoaming pipe 103. One end of the connecting pipe 105 is connected to the defoaming pipe 103. The connecting pipe 105 in one aerobic tank 1 is connected to the reaction zone 101 of the other aerobic tank 1. The connecting pipe 105 is used to transfer the mixed liquor in the defoaming pipe 103 connected to it to the reaction zone 101 of the other aerobic tank 1.

[0032] In this embodiment, please refer to Figure 1 Two identical aerobic tanks 1 are spaced apart. Under normal circumstances, the two aerobic tanks 1 can operate independently. Specifically, the aerobic tank 1, as the core device of the wastewater treatment system employing the aerobic biological treatment method, continuously introduces oxygen into the wastewater through an aeration device (not shown in the figure) within the reaction zone 101 of the aerobic tank 1, providing a sufficient dissolved oxygen environment for aerobic microorganisms (such as bacteria and protozoa in activated sludge). Under the metabolic action of these microorganisms, dissolved organic matter (such as BOD5 and COD) in the wastewater is largely degraded and converted into carbon dioxide and water. At the same time, ammonia nitrogen (NH3-N) is oxidized into nitrite and nitrate by nitrifying bacteria, thereby achieving the dual purpose of removing organic pollutants and denitrification.

[0033] Meanwhile, during the aerobic biological treatment process, aeration is required to supply oxygen to the aerobic organisms, resulting in a large amount of foam in aerobic tank 1. This excessive foam covers the tank surface, hindering normal oxygen transfer into the water, reducing aeration efficiency, and directly leading to increased energy consumption and decreased treatment effectiveness. Furthermore, foam overflows from the tank, causing slippery surrounding surfaces, contaminating equipment, emitting foul odors, and deteriorating the on-site operating environment. Therefore, please refer to... Figure 1 In this embodiment, a defoaming pipe 103 is provided at the top of the reaction zone 101. The defoaming pipe 103 uses a power pump 104 to draw a mixture containing sludge from the separation zone 102 to spray and defoam the foam in the reaction zone 101.

[0034] It is understandable that when one of the aerobic tanks 1 malfunctions due to water quality shocks or abnormal operating conditions, problems such as a sharp decrease in sludge settling ratio and a significant reduction in microbial degradation efficiency will occur, ultimately affecting the wastewater treatment effect of the aerobic tank 1. For ease of understanding, in this embodiment, the malfunctioning aerobic tank 1 is marked as the malfunctioning aerobic tank 1, and the other aerobic tank 1 is marked as the normal aerobic tank 1. At this time, the aerobic device in this embodiment is also equipped with two connecting pipes 105, which are respectively connected to two defoaming pipes 103. The connecting pipes 105 can be used to transfer the mixed liquid in the separation zone 102 of one aerobic tank 1 to the reaction zone 101 of the other aerobic tank 1. Specifically, when one aerobic tank 1 malfunctions, the mixed liquid containing sludge is extracted from the separation zone 102 of the normal aerobic tank 1 and transported to the reaction zone 101 of the malfunctioning aerobic tank 1 via the connecting pipes 105. In this way, emergency bacterial replenishment was achieved for the faulty aerobic tank 1, and the biochemical treatment capacity of the faulty aerobic tank 1 was restored.

[0035] Therefore, in this embodiment, the defoaming pipeline 103 can not only play the role of spray defoaming, but also, when the reaction zone 101 in one aerobic tank 1 malfunctions due to a decrease in sludge settling ratio, it can extract the sludge-containing mixed liquid in the separation zone 102 of another aerobic tank 1 through the connecting pipeline 105, thus realizing the linkage between the defoaming pipelines 103 of the two aerobic tanks 1.

[0036] In some other embodiments, the aerobic device also includes two first control valves 2, which are respectively disposed on two connecting pipes 105.

[0037] Please refer to Figure 1 In this embodiment, to facilitate the opening and closing control of the connecting pipes 105, a first control valve 2 is provided on each connecting pipe 105. The first control valve 2 can be a clog-resistant, corrosion-resistant manual ball valve, or a solenoid valve or an electric valve. If an electric valve is used, the amount of sludge-containing mixed liquid conveyed by the connecting pipe 105 can be controlled by adjusting the opening degree of the electric valve.

[0038] In some other embodiments, the defoaming pipeline 103 includes an inlet pipe 1031, an annular main pipe 1032, and a plurality of branch pipes 1033. One end of the inlet pipe 1031 is connected to the power pump 104, and the other end is connected to the annular main pipe 1032. A plurality of branch pipes 1033 are spaced apart on the annular main pipe 1032. The annular main pipe 1032 is horizontally arranged on the inner side of the top of the reaction zone 101, and a predetermined distance is left between it and the top wall of the reaction zone 101.

[0039] Please continue to refer to this. Figure 1 In this embodiment, the annular main pipe 1032 of the defoaming pipeline 103 is positioned at the top of the reaction zone 101, which increases the coverage area of ​​the annular main pipe 1032 when spraying defoaming onto the liquid surface of the reaction zone 101, thereby improving the defoaming effect. Simultaneously, to further increase the coverage area, multiple branch pipes 1033 are spaced apart on the annular main pipe 1032. Specifically, the connecting pipe 105 can be positioned in the middle of the annular main pipe 1032.

[0040] In some other embodiments, the defoaming pipeline 103 also includes a plurality of second control valves 1034, with one second control valve 1034 provided on each opposite side of each annular main pipe 1032.

[0041] Please refer to Figure 1 When the connecting pipe 105 replenishes the mixed liquor to another aerobic tank 1, the amount of mixed liquor in the annular main pipe 1032 connected to the connecting pipe 105 will decrease. To prevent the spray defoaming effect of the annular main pipe 1032 from decreasing due to the reduction of mixed liquor, a second control valve 1034 is provided on each of the opposite sides of the annular main pipe 1032. At this time, both second control valves 1034 are closed, meaning that only part of the annular main pipe 1032 will perform normal spray defoaming, ensuring that the defoaming pipe 103 can provide mixed liquor to the connecting pipe 105 while performing normal defoaming work.

[0042] In other embodiments, please refer to Figure 2 Each separation zone 102 has a return port 1021 at its bottom. Sludge in the separation zone 102 is returned to the reaction zone 101 through the return port 1021. A power pump 104 is located at the bottom of the separation zone 102. The sludge settles at the bottom of the separation zone 102 due to gravity and returns to the reaction zone 101 through the return port 1021, ensuring the concentration of activated sludge and microorganisms in the reaction zone 101. Therefore, placing the power pump 104 at the bottom of the separation zone 102 ensures that the power pump 104 can extract any sludge that is not returned in time and return it to the reaction zone 101 through the defoaming pipe 103, or move it to the reaction zone 101 of another aerobic tank 1 through the connecting pipe 105.

[0043] In other embodiments, please refer to Figure 1 Each reaction zone 101 is also equipped with a detection element 1011, which is used to detect the operational index data within the reaction zone 101. In this embodiment, the operational index data fed back by the detection element 101 allows the operator to monitor the operational status of the reaction zone 101 in real time, thereby controlling the opening and closing of the connecting pipeline 105 according to its operational status. Specifically, the operational index can be sludge settling ratio, activated sludge concentration, COD and ammonia nitrogen degradation efficiency, etc. For example, the normal sludge settling ratio in the reaction zone 101 should be between 25% and 30%. If the detection element 1011 detects a sludge settling ratio of 7%, then the aerobic tank 1 is marked as a faulty aerobic tank 1.

[0044] This invention also provides a control method for an aerobic device; for details, please refer to... Figure 3 The control method includes the following steps: S100. Obtain the operational index data detected by the test piece 1011, and determine the operational status of the reaction zone 101 in the two aerobic tanks 1 based on the operational index data.

[0045] S200. If the operating index data of reaction zone 101 in one aerobic tank 1 is lower than the preset index data, the first control valve 2 in the other aerobic tank 1 is opened until the operating index data of reaction zone 101 is equal to the preset index data, then the first control valve 2 is closed.

[0046] In some embodiments, if the operational index data of reaction zone 101 in an aerobic tank 1 is lower than the preset index data, the control method further includes: S201. Control the two second control valves 1034 in another aerobic tank 1 to close until the operating index data of reaction zone 101 equals the preset index data, then control the two second control valves 1034 to open.

[0047] This invention also provides a wastewater treatment system that uses the aerobic device provided in the above embodiments.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An aerobic device, characterized in that, The system includes two aerobic tanks (1) spaced apart. Each aerobic tank (1) includes a reaction zone (101), a separation zone (102), a defoaming pipeline (103), a power pump (104), and a connecting pipeline (105). The bottoms of the reaction zone (101) and the separation zone (102) are interconnected. The defoaming pipeline (103) is located at the top of the reaction zone (101) and is used to eliminate foam in the reaction zone (101). The power pump (104) is located in the separation zone (102), and the power pump (104) is connected to the defoaming pipeline. The pipeline (103) is connected, and the power pump (104) is used to transport the sludge-containing mixture in the separation zone (102) to the defoaming pipeline (103). One end of the connecting pipeline (105) is connected to the defoaming pipeline (103). The connecting pipeline (105) in one aerobic tank (1) is connected to the reaction zone (101) of another aerobic tank (1). The connecting pipeline (105) is used to transfer the mixture in the defoaming pipeline (103) connected to it to the reaction zone (101) of another aerobic tank (1).

2. The aerobic device according to claim 1, characterized in that, The aerobic device also includes two first control valves (2), which are respectively installed on the two connecting pipelines (105).

3. The aerobic device according to claim 1, characterized in that, The defoaming pipeline (103) includes an inlet pipe (1031), a ring main pipe (1032), and multiple branch pipes (1033). One end of the inlet pipe (1031) is connected to the power pump (104), and the other end is connected to the ring main pipe (1032). Multiple branch pipes (1033) are spaced apart on the ring main pipe (1032). The ring main pipe (1032) is horizontally arranged on the inner side of the top of the reaction zone (101) and a predetermined distance is left between it and the top wall of the reaction zone (101).

4. The aerobic device according to claim 3, characterized in that, The connecting pipe (105) is located in the middle of the annular main pipe (1032).

5. The aerobic device according to claim 3, characterized in that, The defoaming pipeline (103) also includes a plurality of second control valves (1034), with one second control valve (1034) respectively provided on each of the opposite sides of each of the annular main pipes (1032).

6. The aerobic device according to claim 1, characterized in that, Each separation zone (102) has a return port (1021) at its bottom. The sludge in the separation zone (102) is returned to the reaction zone (101) through the return port (1021). The power pump (104) is located at the bottom of the separation zone (102).

7. The aerobic device according to claim 1, characterized in that, Each of the reaction zones (101) is also provided with a detection element (1011), which is used to detect the operating index data in the reaction zone (101).

8. A control method for an aerobic device, characterized in that, The control method, applied to the aerobic apparatus as described in any one of claims 1-7, comprises: Obtain the operational index data of the test piece (1011), and determine the operational status of the reaction zone (101) in the two aerobic tanks (1) based on the operational index data; If the operating index data of the reaction zone (101) in one of the aerobic tanks (1) is lower than the preset index data, the first control valve (2) in the other aerobic tank (1) is opened until the operating index data of the reaction zone (101) is equal to the preset index data, and then the first control valve (2) is closed.

9. The control method according to claim 8, characterized in that, If the operational index data of the reaction zone (101) in one of the aerobic tanks (1) is lower than the preset index data, the method further includes: Control the two second control valves (1034) in another aerobic tank (1) to close until the operating index data of the reaction zone (101) equals the preset index data, then control the two second control valves (1034) to open.

10. A wastewater treatment system, characterized in that, Includes the aerobic device as described in any one of claims 1-7.

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