Double-track aerobic unit and double-track sewage treatment system

Abstract

The utility model relates to water treatment field especially, it relates to a double track system aerobic unit and double track system sewage treatment system, this double track system aerobic unit includes the high -speed activated sludge pool and double track system work pool connected in proper order, through the process parameter of double track system work pool is adjusted to make double track system work pool as target high -speed activated sludge pool or nitrification pool, the input end of double track system aerobic unit is connected with sewage source. The process parameter of double track system work pool is adjusted in the application, makes it can be switched to target high -speed activated sludge pool or nitrification pool according to the working condition requirement, to adapt to different working condition with single pool body, the flexibility of system operation and the adaptability to multiple working conditions are improved significantly.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a dual-track aerobic unit and a dual-track wastewater treatment system. Background Technology

[0002] Traditional activated sludge processes, particularly nitrification and denitrification, are effective for nitrogen removal. However, nitrification requires the sequential removal of organic matter and ammonia nitrogen from the water, necessitating longer hydraulic retention times and larger reactor volumes, thus increasing construction costs. Denitrification, on the other hand, requires sufficient organic matter, necessitating the addition of external carbon sources to the nitrification effluent, further increasing operating costs. Therefore, this process does not effectively utilize carbon sources in wastewater, resulting in long operating times and high construction and operating costs (including aeration energy consumption and external carbon source additions). Furthermore, continuous flow operation of nitrification and denitrification may promote filamentous bacteria growth, increasing the risk of sludge bulking and affecting activated sludge settling performance and system stability. In addition, the system has poor adaptability to shock loads; when influent water quality or quantity fluctuates significantly, the nitrogen removal effect is easily affected, potentially leading to total nitrogen (TN) exceeding standards. Traditional aerobic zones typically have fixed functions, using independently set up high-speed activated sludge tanks and nitrification tanks, making adjustments difficult to adapt to different operating conditions. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a dual-track aerobic unit and a dual-track sewage treatment system.

[0004] In a first aspect, this utility model embodiment provides a dual-track aerobic unit, which includes a high-speed activated sludge tank and a dual-track working tank connected in sequence. The process parameters of the dual-track working tank are adjusted to make the dual-track working tank a target high-speed activated sludge tank or nitrification tank. The input end of the dual-track aerobic unit is connected to the sewage source.

[0005] In conjunction with the first aspect, the dual-track aerobic unit is sequentially connected to the anoxic zone and the chemical phosphorus removal unit. A secondary sedimentation tank and an equalization tank are also sequentially connected between the dual-track aerobic unit and the anoxic zone. The equalization tank is also connected to the sewage source or iron salt input device.

[0006] In conjunction with the first aspect, the chemical phosphorus removal unit is connected to the iron salt feeding device so that iron salt can be added to the chemical phosphorus removal unit through the iron salt feeding device.

[0007] In conjunction with the first aspect, in the case of a high-speed activated sludge tank with a dual-track working tank as the target, the connecting pipeline between the equalization tank and the iron salt addition device is opened to add trivalent iron salt to the equalization tank.

[0008] In conjunction with the first aspect, when the dual-track working tank is a nitrification tank, the connecting pipeline between the equalization tank and the sewage source is opened.

[0009] In conjunction with the first aspect, the high-speed activated sludge tank and the dual-track working tank are respectively connected to the aeration device.

[0010] Secondly, this application provides a dual-track wastewater treatment system, including a control unit, a dual-track aerobic unit as described above, an anoxic zone and a chemical phosphorus removal unit connected sequentially to the dual-track aerobic unit, and a secondary sedimentation tank and an equalization tank connected sequentially between the dual-track aerobic unit and the anoxic zone; the secondary sedimentation tank is connected to a high-speed activated sludge tank through a first pipeline, and the secondary sedimentation tank is also connected to a dual-track working tank through a second pipeline; a sludge pump is installed on the first pipeline, and a wastewater pump is installed on the second pipeline; the sludge pump and the wastewater pump are respectively communicatively connected to the control unit.

[0011] In conjunction with the second aspect, the chemical phosphorus removal unit includes a mixing tank, a flocculation tank, and a sedimentation tank connected in sequence; the mixing tank is connected to the iron salt feeding device through a third pipeline, and the iron salt feeding device is also connected to the equalization tank through a fourth pipeline; both the third and fourth pipelines are equipped with chemical pumps; the chemical pumps are communicatively connected to the control unit.

[0012] In conjunction with the second aspect, when the dual-track working tank in the dual-track aerobic unit is intended to produce high-speed activated sludge, the third and fourth pipelines are connected to add iron salts to the mixing tank and the equalization tank, respectively.

[0013] In conjunction with the second aspect, if the dual-track working tank in the dual-track aerobic unit is a nitrification tank, a third pipeline is connected to add iron salt to the mixing tank.

[0014] The present invention provides the following beneficial effects: The present invention provides a dual-track aerobic unit and a dual-track sewage treatment system. The dual-track aerobic unit includes a high-speed activated sludge tank and a dual-track working tank connected in sequence. The dual-track working tank is a target high-speed activated sludge tank or a nitrification tank. The input end of the dual-track aerobic unit is connected to the sewage source.

[0015] This application adjusts the process parameters of the dual-track working tank to make it serve as a target high-speed activated sludge tank or nitrification tank, thereby using a single tank to adjust process parameters to adapt to different operating conditions, improving operational flexibility and adaptability to different operating conditions.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the dual-track aerobic unit provided in an embodiment of the present invention; Figure 2 A schematic diagram of the dual-track wastewater treatment system structure when the dual-track working tank is used as a nitrification tank, as provided in an embodiment of this utility model; Figure 3 A schematic diagram of the dual-track wastewater treatment system structure provided in this embodiment of the present invention, when the dual-track working tank is used as the target high-speed activated sludge tank.

[0020] The attached figures are labeled as follows: 1-High-speed activated sludge tank, 2-Dual-track working tank, 3-Anoxic zone, 4-Chemical phosphorus removal unit, 5-Secondary sedimentation tank, 6-Equalization tank, 7-Iron salt addition device. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] To facilitate understanding of this embodiment, the application scenarios and design concepts of this application embodiment will be briefly introduced below.

[0023] Traditional activated sludge processes, particularly nitrification and denitrification, are effective in nitrogen removal, but they are costly to construct and operate, prone to sludge bulking, and have poor adaptability to shock loads. When influent water quality or quantity fluctuates significantly, the nitrogen removal efficiency is easily affected. Furthermore, traditional aerobic zones typically have fixed functions that are difficult to adjust according to different operating conditions.

[0024] Based on this, this application provides a dual-track aerobic unit and a dual-track wastewater treatment system.

[0025] Example 1 This application provides a dual-track aerobic unit, combined with... Figure 1As shown, the dual-track aerobic unit includes a high-speed activated sludge tank 1 and a dual-track working tank 2 connected in sequence. By adjusting the process parameters of the dual-track working tank 2, the dual-track working tank 2 can be made into a target high-speed activated sludge tank or nitrification tank. The input end of the dual-track aerobic unit is connected to the sewage source.

[0026] In this application, the dual-track aerobic unit adjusts the process parameters of the dual-track working tank 2 to adapt to the usage requirements under different operating conditions and achieve different functions. This allows one device to perform the functions of two different operating conditions, improving flexibility. Compared with the situation where the connecting pipelines of independently set high-speed activated sludge tanks and nitrification tanks are adjusted, the installation cost can be reduced.

[0027] The nitrification tank mainly uses nitrifying bacteria to convert ammonia nitrogen into nitrate, thereby providing a reaction substrate (nitrate) for subsequent biological reactions. Therefore, under the condition that the influent C / N ratio is appropriate and the subsequent biological reactions can proceed smoothly, untreated sewage enters the dual-track aerobic unit from the sewage source. It first passes through the high-speed activated sludge tank for organic matter degradation, and then passes through the nitrification tank to convert ammonia nitrogen into nitrate.

[0028] In this embodiment, when the dual-track working tank 2 is a nitrification tank, the operating parameters of the high-speed activated sludge tank 1 are: dissolved oxygen concentration of 0.2-1 mg / L, sludge retention time (SRT) of 0.2-0.6 days, and hydraulic retention time (HRT) of 0.25-0.5 h; the operating parameters of the nitrification tank are: dissolved oxygen concentration at the end of the tank is 2-4 mg / L, and ammonia nitrogen concentration is less than 0.5 mg / L.

[0029] High-speed activated sludge tanks are primarily used for the rapid treatment of organic matter in wastewater. Through high-concentration activated sludge and a sufficient oxygen supply, they accelerate the degradation of organic pollutants by microorganisms, transferring organic matter into the sludge. This process transforms and stores carbon sources from the wastewater, making them suitable for treating large quantities of wastewater with high concentrations of organic matter. When the influent C / N ratio is low and subsequent biological reactions cannot proceed smoothly, a dual-track working tank serves as the target high-speed activated sludge tank. Untreated wastewater enters the dual-track aerobic unit from the wastewater source, undergoing two consecutive rounds of efficient organic matter degradation. This maintains the sludge activity in the dual-track working tank and improves the system's resistance to shock loads.

[0030] In this embodiment, when the dual-track working tank is the target high-speed activated sludge tank, the operating parameters of both the high-speed activated sludge tank 1 and the target high-speed activated sludge tank are: dissolved oxygen concentration of 0.2-1 mg / L, solid retention time (SRT) of 0.1-0.3 days, and hydraulic retention time (HRT) of 0.125-0.25 h.

[0031] In this way, in the process of urban wastewater treatment, the dual-track aerobic unit adjusts the operating parameters to execute different working modes in order to cooperate with the subsequent anoxic denitrification process for efficient nitrogen removal.

[0032] In conjunction with the first aspect, the dual-track aerobic unit is sequentially connected to the anoxic zone 3 and the chemical phosphorus removal unit 4. A secondary sedimentation tank 5 and an equalization tank 6 are also sequentially connected between the dual-track aerobic unit and the anoxic zone 3. The equalization tank 6 is also connected to the sewage source or iron salt input device 7.

[0033] In conjunction with the first aspect, with the dual-track working tank 2 serving as the target high-speed activated sludge tank, the connecting pipeline between the equalization tank 6 and the iron salt addition device 7 is opened to add trivalent iron salt to the equalization tank. Figure 3 As shown.

[0034] At this point, the effluent from the dual-track working tank 2 is fed into the secondary settling tank 5 for sedimentation, to precipitate solids from the mixed liquor flowing out of the dual-track aerobic unit, further clarifying the water quality. Specifically, the activated sludge settles to the bottom under gravity, while the supernatant flows to the subsequent treatment unit. The supernatant is then fed into the equalization tank 6 and mixed with ferric salts. Specifically, the pH of the mixed liquor is adjusted to 7.29-7.32, and the Fe content in the effluent from the equalization tank is periodically monitored. 3+ and NH4 + -N concentration, ensuring the ratio is between 3:1 and 5:1. Then proceed with subsequent nitrogen and phosphorus removal.

[0035] Among them, pH and Fe 3+ There may be some correlation between dosage amounts. For example, Fe 3+ The hydrolysis products of Fe can affect the pH value, therefore, when adding Fe... 3+ It is necessary to pay attention to the impact on pH and adjust the dosage of alkaline or acidic substances as needed. Preferably, pH and Fe can be controlled via a PLC or SCADA system. 3+ The automated control of dosing improves operational efficiency and reduces manual intervention.

[0036] The regulated water flow is then directed to anoxic zone 3, which is filled with anaerobic ammonia oxidation biofilm packing or granular sludge. Fe reaction occurs within anoxic zone 3. 3+-Anammox reaction, using added ferric iron to convert ammonia nitrogen in the influent into nitrogen gas.

[0037] In conjunction with the first aspect, when the dual-track working tank is a nitrification tank, the connecting pipeline between the equalization tank 6 and the sewage source is opened, combined with... Figure 2 As shown.

[0038] At this point, the effluent from the dual-track working tank 2 is fed into the secondary settling tank 5 for sedimentation, to precipitate solids from the mixed liquor flowing out of the dual-track aerobic unit, further clarifying the water quality. Specifically, the activated sludge settles to the bottom under gravity, while the supernatant flows to the subsequent treatment unit. The supernatant is then fed into the equalization tank 6 to mix with the wastewater source to adjust the water quality entering the anoxic zone 3. Specifically, the pH of the equalization and mixed liquor is 7.27-7.29, and the carbon-to-nitrogen ratio is 1.14-2.86.

[0039] The secondary sedimentation tank 5 in this application is located between the dual-track aerobic unit and the anoxic zone 3, which is significantly different from the previous practice of setting it at the end of the process. Its main advantages are: the secondary sedimentation tank 5 blocks the flow between the sludge of the dual-track aerobic unit and the sludge of the anoxic zone 3, which can inhibit the growth of filamentous bacteria, reduce the risk of sludge bulking, and improve the settling performance of activated sludge and the stability of the system; at the same time, it avoids the competition of microorganisms caused by sludge mixing, thereby ensuring the biological activity and abundance of functional bacteria (i.e., anaerobic ammonia oxidizing bacteria) in the anoxic zone 3, which is conducive to maintaining the stability of the microbial system and denitrification efficiency in the anoxic zone 3.

[0040] The supernatant is then introduced into equalization tank 6 to regulate the water volume and quality, ensuring that the wastewater flowing into the anoxic zone 3 has relatively stable characteristics and flow rate. Understandably, this regulation helps prevent fluctuations in influent from impacting subsequent biological treatment units.

[0041] The regulated water flow is then directed to anoxic zone 3, which is filled with anaerobic ammonia oxidation biofilm packing or granular sludge. In anoxic zone 3, a short-range nitrate dissimilatory reduction to ammonium coupled with anaerobic ammonia oxidation (PDNRA - Anammox) reaction occurs, so as to utilize the organic matter in the wastewater to simultaneously convert ammonia nitrogen and nitrate into nitrogen gas.

[0042] Finally, the wastewater is introduced into the chemical phosphorus removal unit 4, where chemical agents (iron salts) are added to form insoluble phosphate precipitates, thereby removing phosphorus from the wastewater. This effectively reduces the phosphorus content in the wastewater and prevents eutrophication of the water body.

[0043] In conjunction with the first aspect, the chemical phosphorus removal unit 4 is connected to the iron salt feeding device 7, which is used to supplement the chemical treatment unit with iron salt.

[0044] Iron salt is added to the chemical phosphorus removal unit 4 through the iron salt addition device 7 to form phosphate precipitate to remove phosphorus and reduce the phosphorus content.

[0045] In conjunction with the first aspect, the equalization tank 6 is also connected to the iron salt addition device 7. In the case where the dual-track working tank 2 is the target high-speed activated sludge tank, the connecting pipeline between the equalization tank 6 and the iron salt addition device 7 is opened to add trivalent iron salt to the equalization tank 6.

[0046] In conjunction with the first aspect, the high-speed activated sludge tank 1 and the dual-track working tank 2 are respectively connected to the aeration device.

[0047] Secondly, this application provides a dual-track wastewater treatment system, including a control unit, a dual-track aerobic unit as described above, an anoxic zone 3 and a chemical phosphorus removal unit 4 connected sequentially to the dual-track aerobic unit, and a secondary sedimentation tank 5 and an equalization tank 6 connected sequentially between the dual-track aerobic unit and the anoxic zone 3; the secondary sedimentation tank 5 is also connected to the high-speed activated sludge tank 1 and the dual-track working tank 2 through a first pipeline and a second pipeline respectively, a sludge pump is installed on the first pipeline, and a wastewater pump is installed on the second pipeline, and the sludge pump and the wastewater pump are communicatively connected to the control unit.

[0048] In this embodiment, based on the actual operating conditions (whether the ammonia nitrogen concentration of the effluent is within the preset range), it can be determined whether the sewage treatment efficiency can meet the preset requirements and whether the shock load of the high-speed activated sludge tank is overloaded. Then, by adjusting the specific operating parameters of the dual-track working tank 2 in the dual-track aerobic unit as the target high-speed activated sludge tank or nitrification tank, it can adapt to different operating conditions. Compared with the method of setting two tanks to switch the conduction pipeline, under the premise of adapting to different operating conditions, one dual-track working tank replaces two tanks, reducing costs.

[0049] In conjunction with the second aspect, the chemical phosphorus removal unit 4 includes a mixing tank, a flocculation tank, and a sedimentation tank connected in sequence; the mixing tank is connected to the iron salt feeding device 7 through a third pipeline, and the iron salt feeding device 7 is also connected to the equalization tank 6 through a fourth pipeline. A chemical pump is installed on both the third and fourth pipelines; the chemical pump is communicatively connected to the control unit.

[0050] The mixing tank, connected to the iron salt addition device 7, primarily ensures rapid and uniform distribution of the reagent in the water, promoting the initiation of the chemical reaction. Key parameters are: a molar ratio of iron salt to total phosphorus in the wastewater of 1.5-3.0; a residence time of 30-60 seconds; and a mixing intensity (G value) of 700-1000 s. -1 .

[0051] Flocculation tank: Its main function is to ensure the full reaction of the reagents and phosphates to form larger flocs. Key parameters are: hydraulic retention time: 15-30 minutes; stirring intensity (G-value): 20-60 s. -1 .

[0052] Sedimentation tank: Its main function is to separate the formed phosphate flocs by gravity sedimentation, and the resulting precipitate is sent to the iron and phosphorus recovery unit. Surface loading: 8-12 m³ 3 / (m 2 ·h), sedimentation zone water depth: 3~5 m.

[0053] The inclusion of chemical phosphorus removal unit 4 not only improves effluent quality but also makes the operation of the high-speed activated sludge tank and anoxic zone more flexible. For short-sludge-age high-speed activated sludge systems, although their removal efficiency is generally good, phosphorus removal efficiency can remain above 90%. Furthermore, because the mixing unit requires secondary iron salt addition, the operation of the anoxic zone is more flexible, effectively avoiding iron contamination caused by excessive iron salt addition, thus achieving deep effluent treatment and significantly improving effluent quality. Clearly, the inclusion of the chemical phosphorus removal unit helps realize the true effectiveness of short-sludge-age activated sludge systems and anaerobic ammonia oxidation denitrification systems.

[0054] In conjunction with the second aspect, when the dual-track working tank 2 in the dual-track aerobic unit is used to target high-speed activated sludge, the third and fourth pipelines are connected to add iron salts to the mixing tank and the equalization tank 6, respectively.

[0055] In this mode, all wastewater is fed into the high-speed activated sludge tank 1 and the target high-speed activated sludge tank. Through short sludge age (SRT 0.1-0.3 d) and low dissolved oxygen (DO 0.2-1 mg / L) operation, organic matter (COD) in the wastewater is rapidly adsorbed and stored, reducing the organic load of subsequent units, reducing aeration energy consumption, and simultaneously recovering carbon sources into the sludge to provide a substrate for subsequent anaerobic ammonia oxidation.

[0056] The effluent from the high-speed activated sludge tank enters the secondary sedimentation tank to separate the sludge from the supernatant. The bottom sludge is then returned to the high-speed activated sludge tank to maintain a stable sludge concentration in the aerobic zone (1500-3000 mg / L). Iron salts are added to the equalization tank 6 for water quality conditioning. The equalization tank mixes the effluent from the secondary sedimentation tank 5 with the ferric salts. The pH of the effluent from the equalization tank 6 is controlled at 7.29-7.32, while the Fe content is also controlled. 3+ :NH4 + -N ranges from 3:1 to 5:1.

[0057] The anoxic zone 3 is filled with anaerobic ammonia oxidation biofilm packing or granular sludge, where Fe2+ mainly occurs. 3+ The Anammox reaction requires no external carbon source and directly uses Fe... 3+ Anaerobic ammonia-oxidizing bacteria, acting as electron acceptors, convert ammonia nitrogen into nitrogen gas to cope with unfavorable influent conditions of low C / N ratio.

[0058] In conjunction with the second aspect, when the dual-track working tank 2 in the dual-track aerobic unit is a nitrification tank, a third pipeline is connected to add iron salt to the mixing tank.

[0059] In this mode, some wastewater directly enters the equalization tank 6 (the proportion is adjustable), and the remaining wastewater enters the high-speed activated sludge tank. The operating parameters are: sludge retention time (SRT): 0.2-0.6 days, hydraulic retention time (HRT): 0.25-0.5 hours, and dissolved oxygen (DO): 0.2-1 mg / L. By directly diverting some wastewater to the equalization tank, organic carbon sources are provided for anaerobic ammonia-oxidizing bacteria, while the high-speed activated sludge tank can quickly adsorb organic matter and store carbon sources, providing low organic load conditions for subsequent nitrification reactions.

[0060] After treatment in the high-speed activated sludge tank, nitrification occurs, where ammonia nitrogen (NH4) is removed through nitrification. + -N) is converted into nitrate nitrogen (NO3) - The concentration of ammonia nitrogen (NO3) is controlled at 2-4 mg / L to ensure that ammonia nitrogen is oxidized to nitrate nitrogen and the concentration of residual ammonia nitrogen is controlled to be reduced to <0.5 mg / L.

[0061] The supernatant from the secondary sedimentation tank 5 enters the equalization tank 6 to mix with the sewage, controlling the pH at 7.27-7.29 and adjusting the carbon-nitrogen ratio (C / N=1.14-2.86); the bottom sludge from the secondary sedimentation tank 5 is returned to the high-speed activated sludge tank to maintain a stable sludge concentration (1500-3000mg / L).

[0062] The anoxic zone 3 is filled with anaerobic ammonia oxidation biofilm packing or granular sludge, where the main reaction is short-range nitrate dissimilatory reduction to ammonium coupled with anaerobic ammonia oxidation (PDNRA - Anammox) to utilize the organic matter in the wastewater to simultaneously convert ammonia nitrogen and nitrate into nitrogen gas.

[0063] In addition, the sludge in the high-speed activated sludge tank 1 is fed into a thickening tank for concentration treatment to obtain concentrated sludge with a water content of 90%-95%, and the concentrated liquid is returned to the high-speed activated sludge tank 1. The concentrated sludge is fed into a fermentation tank for fermentation, and the fermentation products are fermentation broth and residual fermentation material. The fermentation broth mainly consists of volatile fatty acids (VFAs) and ammonia nitrogen (NH4⁺), while the residual fermentation material mainly consists of recalcitrant organic matter and inert substances. The residual fermentation material is fed into a digester for digestion treatment to obtain digested gas and digested sludge. The digested gas is introduced into an energy conversion unit for gas purification, power generation, and energy recovery. The gas generator converts methane into electricity (conversion efficiency ≥35%), and the waste heat is used for system heating. Through the above steps, a carbon source-energy closed loop can be achieved: after the sludge in the high-speed activated sludge tank is concentrated, it enters the fermentation (anaerobic digestion) stage, and the digested gas (biogas) produced can be converted into electricity or heat energy, ultimately achieving partial energy self-sufficiency of the system and effectively reducing the consumption of purchased electricity.

[0064] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0065] Furthermore, in the description of the embodiments of this application, unless otherwise explicitly defined and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0067] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A dual-track aerobic unit, characterized in that, The dual-track aerobic unit includes a high-speed activated sludge tank and a dual-track working tank connected in sequence. The process parameters of the dual-track working tank are adjusted to make the dual-track working tank serve as a target high-speed activated sludge tank or nitrification tank. The input end of the dual-track aerobic unit is connected to the wastewater source.

2. The dual-track aerobic unit according to claim 1, characterized in that, The dual-track aerobic unit is sequentially connected to the anoxic zone and the chemical phosphorus removal unit. A secondary sedimentation tank and an equalization tank are also sequentially connected between the dual-track aerobic unit and the anoxic zone. The equalization tank is also connected to the wastewater source or iron salt input device.

3. The dual-track aerobic unit according to claim 2, characterized in that, The chemical phosphorus removal unit is connected to the iron salt feeding device so that iron salt can be added to the chemical phosphorus removal unit through the iron salt feeding device.

4. The dual-track aerobic unit according to claim 2, characterized in that, When the dual-track working tank is the target high-speed activated sludge tank, the connecting pipeline between the equalization tank and the iron salt addition device is connected to add trivalent iron salt to the equalization tank.

5. The dual-track aerobic unit according to claim 2, characterized in that, When the dual-track working tank is a nitrification tank, the connecting pipeline between the equalization tank and the sewage source is connected.

6. The dual-track aerobic unit according to claim 1, characterized in that, The high-speed activated sludge tank and the dual-track working tank are respectively connected to the aeration device.

7. A dual-track sewage treatment system, characterized in that, The system includes a control unit, a dual-track aerobic unit as described in any one of claims 1-6, an anoxic zone and a chemical phosphorus removal unit connected sequentially to the dual-track aerobic unit, and a secondary sedimentation tank and an equalization tank connected sequentially between the dual-track aerobic unit and the anoxic zone; the secondary sedimentation tank is connected to the high-speed activated sludge tank via a first pipeline, and the secondary sedimentation tank is also connected to the dual-track working tank via a second pipeline; a sludge pump is also installed on the first pipeline, and a wastewater pump is also installed on the second pipeline, and the sludge pump and the wastewater pump are respectively communicatively connected to the control unit.

8. The system according to claim 7, characterized in that, The chemical phosphorus removal unit includes a mixing tank, a flocculation tank, and a sedimentation tank connected in sequence; the mixing tank is connected to the iron salt injection device via a third pipeline, and the iron salt injection device is also connected to the equalization tank via a fourth pipeline; a chemical pump is installed on both the third and fourth pipelines; the chemical pump is communicatively connected to the control unit.

9. The system according to claim 8, characterized in that, When the dual-track working tank in the dual-track aerobic unit is used to produce high-speed activated sludge, the third and fourth pipelines are connected to add iron salts to the mixing tank and the equalization tank, respectively.

10. The system according to claim 8, characterized in that, In the case that the dual-track working tank in the dual-track aerobic unit is a nitrification tank, the third pipeline is connected to add iron salt to the mixing tank.

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