Multi-mode switching sewage treatment system

Abstract

The multi-mode switching sewage treatment system provided by the invention comprises a primary sedimentation tank, a biological tank and a secondary sedimentation tank, and the biological tank comprises a tank body, a partition wall, a gate, a filler, a stirrer, an aeration system, a nitrification liquid reflux pump, a pipeline and a valve system; the tank body forms a biological reaction tank; the biological reaction tank is divided into a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone by the partition walls; the gate is arranged on the partition wall, the water flow direction of the sewage treatment system is switched and adjusted through opening and closing of the gate, and the nitrification liquid reflux pump adjusts the quality of reflux liquid through opening and closing of the gate so as to be switched to different modes of multiple modes of the sewage treatment system; the pipeline and valve system performs flow control on sewage, sludge and air, and different modes of multiple modes are switched by opening and closing the gate and adjusting the position of the filler. According to the invention, the switching of the sewage treatment system in different modes under different conditions is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a sewage treatment system with multi-mode switching. Background Art

[0002] With the improvement of global environmental awareness and the increasing importance of water resource protection, sewage treatment has become an important part of the environmental protection field. The continuous development of sewage treatment processes not only pursues the purification of water quality, but also requires high efficiency, low energy consumption and low emissions during the treatment process. However, the sewage treatment systems in related technologies often have difficulty in flexible adjustment when facing different seasons, different water volumes and pollution load changes, resulting in low equipment operation efficiency, increased costs and fluctuating treatment effects. Especially in the case of high water volume during the rainy season, some sewage treatment plants are difficult to cope with, resulting in sewage overflow, polluting water bodies and increasing the burden on the environment.

[0003] Currently, traditional sewage treatment systems are mainly designed based on stable process flows, and usually have specific operating modes preset during design. However, these systems often adopt fixed modes and cannot make flexible adjustments according to the actual operating conditions. For example, during the rainy season or special periods, sewage treatment plants often face the situation of insufficient treatment capacity, especially the problem of being unable to cope with excessive inflow. In addition, with the improvement of sewage treatment standards, the power consumption and chemical consumption for treatment are also increasing continuously, resulting in continuous increase in operating costs. Therefore, the flexible adjustment ability of sewage treatment systems needs to be improved urgently to meet the requirements of different loads and environmental changes.

[0004] In related technologies, secondary sewage treatment is the core process section of sewage treatment plants, which can effectively remove various pollutants such as organic matter, ammonia nitrogen, total nitrogen, and total phosphorus in sewage. The activated sludge process is a commonly used secondary sewage treatment method. During the design process of sewage treatment plants, the most unfavorable factors are considered, and the operating mode is single, which will put pressure on the operation of sewage treatment plants when external conditions change.

[0005] The control of overflow pollution during the rainy season is a difficulty and pain point in the current industry development. In the design of existing sewage treatment plants in China, generally, the treatment flow rates in the rainy season and dry season are the same. Due to the increase in water volume during the rainy season and the inability to improve the treatment capacity of sewage treatment plants, some sewage cannot be treated and directly overflows into the river, resulting in black and smelly rivers during the rainy season and affecting the living quality of surrounding residents.

[0006] With the continuous improvement of the effluent quality standards for sewage treatment in recent years, the power consumption and chemical consumption of sewage treatment have been increasing, resulting in an increase in treatment costs and an accompanying increase in the indirect carbon emissions of sewage treatment. The short-cut / simultaneous nitrification and denitrification process and the mainstream anaerobic ammonium oxidation process have significantly lower requirements for carbon sources and dissolved oxygen than the traditional nitrification and denitrification process. Therefore, the operating costs can be significantly reduced. However, these two processes have high requirements for the operating environment, are difficult to operate stably in actual projects, and there are few engineering cases. In particular, the mainstream anaerobic ammonium oxidation process is rarely applied in China.

[0007] In the sewage treatment systems in related technologies, especially traditional activated sludge processes and multi-stage denitrification processes, there are problems such as poor operation flexibility, high energy consumption, and limited treatment capacity. Especially when faced with sudden high water volumes, these systems cannot quickly adjust the treatment mode, resulting in sewage overflow, pollution spread, and energy waste. Therefore, how to design a system that can flexibly switch between different operating modes while ensuring the treatment effect and reducing the operating cost has become a key issue in current sewage treatment technologies. Summary of the Invention

[0008] The present invention aims to provide a sewage treatment system with multi-mode switching, which is used for sewage treatment systems that can adapt to different treatment requirements and can solve the above technical problems.

[0009] According to one aspect of the present invention, there is provided a sewage treatment system with multi-mode switching, including: a primary sedimentation tank, a biological tank, and a secondary sedimentation tank. The biological tank includes a tank body, a partition wall, a gate, a filler, a stirrer, an aeration system, a nitrification liquid reflux pump, pipelines, and a valve system; the tank body constitutes a biological reaction tank; the partition wall divides the biological reaction tank into a pre-anoxic zone, an anaerobic zone, an anoxic zone, and an aerobic zone; the gate is arranged on the partition wall, and the water flow direction of the sewage treatment system is switched and adjusted by opening and closing the gate. The nitrification liquid reflux pump adjusts the quality of the reflux liquid through the opening and closing of the gate to switch to different modes of the multi-mode of the sewage treatment system; the pipelines and the valve system control the flow of sewage, sludge, and air, and switch different modes of the multi-mode by opening and closing the gate and adjusting the position of the filler.

[0010] Preferably, the multi-mode of the sewage treatment system includes:

[0011] The water flow direction of Mode 1 is in sequence: primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, secondary sedimentation tank. Among them, the sludge of the secondary sedimentation tank is refluxed to the pre-anoxic zone;

[0012] The water flow direction in Mode 2 is successively: the primary sedimentation tank, the pre-anoxic zone, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone, the third anoxic zone, the third aerobic zone, the fourth anoxic zone, the fourth aerobic zone, and the secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone;

[0013] The water flow direction in Mode 3 is successively: the primary sedimentation tank, the pre-anoxic zone, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone, and the secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone, and a filler is provided in the first aerobic zone;

[0014] The water flow direction in Mode 4 is successively: the adsorption tank, the primary sedimentation tank, the pre-anoxic zone, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone, and the secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the second anoxic zone, and the filler is provided in both the first aerobic zone and the first anoxic zone.

[0015] Preferably, in Mode 4, the pre-anoxic tank of the biological tank needs to be used as the adsorption tank for carbon separation, and the primary sedimentation tank is used as the sedimentation tank for carbon separation.

[0016] Preferably, the preset area of the sewage treatment system adopts the perforated pipe aeration method, and through the control of dissolved oxygen, the switching between the anoxic zone and the aerobic zone is carried out.

[0017] Preferably, the nitrification liquid reflux pump is arranged on the partition wall between the aerobic zone and the anoxic zone, and according to one of the multiple modes of operation of the sewage treatment system, the nitrification liquid is refluxed to different anoxic zones to carry out the switching control of the reflux liquid.

[0018] Preferably, the filler includes: suspended filler or fixed filler, the filler is detachable, and the installation position is set according to different modes of the multiple modes.

[0019] Preferably, in Mode 3, the filler is arranged in the aerobic zone;

[0020] In Mode 4, the filler is arranged in the anoxic zone and the aerobic zone.

[0021] Preferably, it further includes: an instrument and an electric control system, which are used to call the opening and closing of valves according to one of the multiple modes required by the sewage treatment system, and control the sewage treatment system to work in the one mode.

[0022] The present invention provides a sewage treatment system with multi-mode switching, including: a primary sedimentation tank, a biological tank, and a secondary sedimentation tank, wherein the biological tank includes a tank body, a partition wall, a gate, packing, a stirrer, an aeration system, a nitrification liquid reflux pump, pipelines, and a valve system; the tank body forms a biological reaction tank; the partition wall divides the biological reaction tank into a pre-anoxic zone, an anaerobic zone, an anoxic zone, and an aerobic zone; the gate is arranged on the partition wall, and the water flow direction of the sewage treatment system is switched and adjusted by opening and closing the gate, and the nitrification liquid reflux pump adjusts the quality of the reflux liquid through the opening and closing of the gate to switch to different modes of the multi-mode of the sewage treatment system; the pipelines and the valve system control the flow of sewage, sludge, and air, and switch different modes of the multi-mode by opening and closing the gate and adjusting the position of the packing. By setting up a sewage treatment system with multi-mode switching, the present invention solves the problems of poor flexibility, high energy consumption, and unstable treatment in the prior art. Through the adjustable gate system and flexible adjustment of the packing configuration, the system can flexibly switch the operation mode according to the changes in the external water volume and pollution load, so as to meet different treatment requirements. During special periods such as the rainy season, the system can effectively improve the treatment capacity through mode switching, reduce sewage overflow pollution, and ensure high-quality effluent in the conventional mode. In addition, the present invention also effectively reduces the operation cost and carbon emission of the system by optimizing the use of the low-carbon emission mode, achieving the dual goals of environmental protection and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 is a schematic diagram of the operation of Mode 1 of the sewage treatment system with multi-mode switching provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the operation of Mode 2 of the sewage treatment system with multi-mode switching provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the operation of Mode 3 of the sewage treatment system with multi-mode switching provided by an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of the operation of Mode 4 of the sewage treatment system with multi-mode switching provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. For the purpose of facilitating interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe the features with reference to the positions of the features of the exemplary embodiments shown in the drawings.

[0030] This embodiment provides a sewage treatment system with multi-mode switching, which may include:

[0031] According to one aspect of the present invention, there is provided a sewage treatment system with multi-mode switching, including: a primary sedimentation tank, a biological tank and a secondary sedimentation tank, wherein the biological tank includes a tank body, a partition wall, a gate, a filler, a stirrer, an aeration system, a nitrification liquid reflux pump, pipelines and a valve system; the tank body constitutes a biological reaction tank; the partition wall divides the biological reaction tank into a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone; the gate is arranged on the partition wall, and the water flow direction of the sewage treatment system is switched and adjusted by opening and closing the gate, and the nitrification liquid reflux pump adjusts the quality of the reflux liquid through the opening and closing of the gate to switch to different modes of the multi-mode of the sewage treatment system; the pipelines and the valve system control the flow of sewage, sludge and air, and switch different modes of the multi-mode by opening and closing the gate and adjusting the position of the filler.

[0032] In the sewage treatment system in the related art, the structure is fixed, resulting in difficulty in flexibly adjusting the treatment method in the case of changes in sewage flow rate, etc., making the sewage treatment efficiency relatively low. The technical solution of this embodiment can achieve: flexible multi-mode switching: by setting the opening and closing of the gate and the pipeline system, the sewage flow direction and the quality of the reflux liquid can be adjusted, so as to achieve a variety of different operating modes. This design greatly improves the flexibility of the sewage treatment system, enabling it to quickly adjust and adapt under different environmental conditions. It can optimize the treatment capacity and cost control: through the deployment of adjustable gates and fillers, the system can change the treatment process according to needs to reduce the operating cost. Secondly, it can improve the system stability and treatment effect: the design of the partition wall divides the biological tank into multiple areas, including a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone, which can precisely control the environmental conditions (such as dissolved oxygen, carbon source, etc.) of each area, optimize the growth environment of microorganisms, and improve the sewage treatment effect.

[0033] The sewage treatment system with multi-mode switching in this embodiment, through flexible mode switching and precise control, can improve the treatment efficiency, reduce the operating cost, and has strong adaptability and environmental friendliness on the premise of ensuring stable water quality compliance.

[0034] Preferably, the multi-modes of the sewage treatment system include:

[0035] The water flow direction in Mode 1 is as follows: primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone;

[0036] The water flow direction in Mode 2 is as follows: primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, third anoxic zone, third aerobic zone, fourth anoxic zone, fourth aerobic zone, secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone;

[0037] The water flow direction in Mode 3 is as follows: primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone. Among them, packing is provided in the first aerobic zone;

[0038] The water flow direction in Mode 4 is as follows: adsorption tank, primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, secondary sedimentation tank. Among them, the sludge from the secondary sedimentation tank is refluxed to the second anoxic zone. Among them, packing is provided in both the first aerobic zone and the first anoxic zone.

[0039] The technical solution of this preferred embodiment can be widely applied to various sewage treatment plants and reclaimed water plants, with flexible operation modes and capable of meeting different treatment requirements.

[0040] In this embodiment, stable high-quality effluent (Mode 1): Under normal conditions, the system operates in Mode 1, adopting an improved AAO (anaerobic / anoxic / aerobic) process. This mode ensures stable effluent quality, can meet strict discharge standards, and is suitable for general daily operation. Secondly, rainy season overflow pollution control (Mode 2): In the rainy season, when the influent volume exceeds the treatment capacity, Mode 2 is activated. This mode adopts a multi-stage AO (anaerobic / aerobic) process, and the water flow passes through four different anoxic zones and aerobic zones, enhancing nitrogen removal and improving the utilization rate of carbon sources. In this way, not only is the overflow pollution reduced, but the water quality of the river is also improved, providing an effective buffer for sewage treatment during rainstorms. In addition, low-cost and low-carbon emission operation (Mode 3): Mode 3 creates a local microenvironment conducive to simultaneous / shortcut nitrification and denitrification processes by adding packing in the first aerobic zone, achieving low-energy consumption and low-carbon emission operation while maintaining stable effluent quality. This method reduces the operation cost while still ensuring the treatment effect. Thirdly, significant cost-effectiveness and enhanced nitrogen removal effect (Mode 4): Mode 4 combines the anaerobic ammonium oxidation (Anammox) process, and packing is installed in both the first aerobic zone and the first anoxic zone. This mode not only significantly reduces the operation cost (reducing energy consumption and chemical requirements) by precisely controlling the microbial environment but also maintains the effluent quality.

[0041] By providing these four modes, the sewage treatment system can adapt to different treatment loads, seasonal variations, and environmental conditions, improving efficiency and reducing costs. The flexibility of the multi-mode enhances the system's adaptability and efficiency in treating different types of sewage, thus ensuring better environmental protection and resource utilization.

[0042] Preferably, in Mode 4, the pre-anoxic tank of the biological tank is used as the adsorption tank for carbon separation, and the primary sedimentation tank is used as the sedimentation tank for carbon separation. In this embodiment, organic matter can be effectively removed. By using the pre-anoxic tank as the carbon separation adsorption tank, organic matter in the sewage can be effectively removed. The design of the adsorption tank helps to adsorb and separate the carbon source in the sewage, thereby reducing the negative impact of organic matter on the subsequent treatment process (especially the anaerobic ammonium oxidation process) and ensuring the smooth progress of the subsequent treatment process. The design of using the pre-anoxic tank as the carbon separation adsorption tank and the primary sedimentation tank as the sedimentation tank significantly improves the treatment effect, reduces the operating cost, and ensures the stability of the effluent quality, providing a more efficient and environmentally friendly operation mode for Mode 4.

[0043] Specifically, the removal of the carbon source can create a better living environment for anaerobic ammonium-oxidizing bacteria to function better. Carbon separation can be carried out by adsorption in the adsorption tank, and then the sludge rich in carbon-source organic matter is precipitated in the primary sedimentation tank.

[0044] Preferably, the preset area of the sewage treatment system adopts the perforated pipe aeration method. By controlling the dissolved oxygen, the switching between the anoxic zone and the aerobic zone is more convenient. In this preferred embodiment, the perforated pipe aeration can more precisely control the distribution of oxygen, enabling the sewage treatment system to dynamically adjust the states of the anoxic zone and the aerobic zone according to needs. This flexibility is crucial for adapting to different operating modes or water quality fluctuations. Additionally, efficient dissolved oxygen control can be achieved. By controlling the dissolved oxygen level, the system can create different microenvironments between the anoxic zone and the aerobic zone. This control is crucial for optimizing the biological treatment process, such as denitrification in the anoxic environment and nitrification in the aerobic environment. Moreover, since the aeration system is adjustable, it can reduce the unnecessary oxygen supply, thereby reducing energy consumption. This helps to reduce the overall operating cost and achieve the sustainable development goal by reducing energy consumption.

[0045] Preferably, the nitrification liquid reflux pump is arranged on the partition wall between the aerobic zone and the anoxic zone, and the nitrification liquid is refluxed to different anoxic zones according to one of the multiple modes of operation of the sewage treatment system to control the switching of the reflux liquid. In this preferred embodiment, the nitrogen cycle process is optimized. The setting of the nitrification liquid reflux pump can flexibly adjust the reflux position of the nitrification liquid, enabling the system to targetedly adjust the nitrogen conversion process under different modes. By refluxing to different anoxic zones, the balance between denitrification and nitrification can be effectively controlled, thereby optimizing the nitrogen removal effect. Secondly, by precisely controlling the position where the nitrification liquid refluxes to the anoxic zone, the system can achieve more efficient nitrogen removal at different treatment stages. Refluxing to different anoxic zones can effectively improve the efficiency of the denitrification process according to the actual water quality requirements, thereby increasing the nitrogen removal rate and ensuring that the effluent quality meets the discharge standards. In addition, this technical feature enables the system to flexibly adjust the reflux path of the nitrification liquid according to different requirements of the operation mode. This flexibility plays an important role in coping with external factors such as influent water quality fluctuations and seasonal changes, improving the adaptability and stability of the system. Thirdly, by reasonably adjusting the reflux flow rate and reflux path of the nitrification liquid, the consumption of energy and chemical agents can be reduced. For example, by refluxing to a more suitable anoxic zone, the demand for external carbon sources and dissolved oxygen can be reduced, thereby lowering energy consumption and operating costs and enhancing the economic efficiency of the system.

[0046] Preferably, the packing includes: suspended packing or fixed packing, and the packing is detachable and is arranged according to different modes of the multiple modes. Through this embodiment, the biodegradation ability can be enhanced. The use of the packing provides a larger surface area and supports the attachment and growth of specific microorganisms required. This helps to improve the efficiency of biological treatment. Especially in the anoxic zone and the aerobic zone, microorganisms can more effectively degrade organic matter and remove nitrogen by attaching to the packing. Secondly, the packing promotes the utilization efficiency of oxygen and nutrients in the treatment process by optimizing the distribution of microorganisms. In Mode 3 and Mode 4, the use of the packing further enhances the stability and effect of the simultaneous / shortcut nitrification-denitrification and anaerobic ammonium oxidation processes, improving the pollutant removal rate. Thirdly, the detachable characteristics of the suspended packing and the fixed packing enable the system to add or remove packing in different regions according to different requirements of the operation mode. This flexibility enables the system to more efficiently adapt to different sewage treatment requirements, such as improving the treatment capacity during the rainy season with excessive treatment and reducing energy consumption during low-carbon emission operation. In addition, the packing can provide attachment points for microorganisms, thereby forming a microenvironment, enabling better regulation of the dissolved oxygen levels in different regions, and making the switching between the anoxic zone and the aerobic zone more refined. This has a positive impact on processes such as denitrification, nitrification, and anaerobic ammonium oxidation, helping to improve the treatment effect and water quality stability.

[0047] It should be noted that by using the packing, the sewage treatment system can improve the treatment efficiency without increasing a large amount of energy consumption. This is because the packing optimizes the utilization of oxygen and the activity of microorganisms, enabling the system to achieve efficient sewage treatment with lower energy consumption and reducing the overall energy consumption. The addition of the packing can stabilize the biological treatment process of the system. Especially in the case of large environmental changes, it helps to maintain the stability of the microbial community, reduce the uncertainty of system operation, and ensure the long-term stable and efficient operation of the system.

[0048] As a preferred embodiment, in Mode 3, the packing is arranged in the aerobic zone; in Mode 4, the packing is arranged in the anoxic zone and the aerobic zone. This preferred embodiment can enhance the microbial activity: in Modes 3 and 4, the arrangement of the packing can significantly increase the attachment surface of microorganisms and provide more biodegradation support. In the aerobic zone and the anoxic zone, microorganisms can more effectively degrade organic matter by attaching to the surface of the packing, especially in the processes of nitrogen removal under aerobic and anaerobic / anoxic conditions. Secondly, it can promote simultaneous / shortcut nitrification and denitrification: in Mode 3, by adding the packing in the aerobic zone, the stability of the simultaneous / shortcut nitrification and denitrification process can be enhanced. This enables the system to carry out nitrification in the aerobic zone and denitrification in the anoxic zone, thereby optimizing the nitrogen removal process and reducing energy consumption in low-carbon emission operation. In addition, it can optimize the anaerobic ammonium oxidation process: in Mode 4, the packing is arranged in the anoxic zone and the aerobic zone, which helps to realize the anaerobic ammonium oxidation (ANAMMOX) process in the main process. At this time, the packing not only provides support for the attachment of microorganisms, but also helps to more precisely regulate the supply of oxygen and nitrogen sources between the anoxic and aerobic environments, enhancing the stability and effect of the anaerobic ammonium oxidation process and significantly reducing energy consumption and the demand for chemical agents.

[0049] It should be noted that whether in Mode 3 or Mode 4, the use of the packing increases the activity of microorganisms by optimizing the distribution of microorganisms and providing attachment points, thereby improving the removal rate of pollutants. Especially the nitrogen removal effect is improved, enabling the system to achieve efficient treatment effects under different operating modes.

[0050] The detachable design of the packing enables the system to flexibly adjust the setting of the packing according to the actual operating mode. In Mode 3, the packing is only arranged in the aerobic zone, which helps to achieve low-energy-consuming nitrification and denitrification; in Mode 4, the packing is arranged in both the anoxic zone and the aerobic zone, further improving the effect of the anaerobic ammonium oxidation process, supporting the smooth transition of multiple operating modes, and meeting different sewage treatment requirements.

[0051] This embodiment can also optimize oxygen utilization and energy conservation. The packing can promote the uniform distribution of oxygen and avoid the waste of oxygen in the system. In Modes 3 and 4, the addition of the packing reduces the dependence on high-intensity aeration, thereby reducing the energy consumption of the system. In addition, the packing optimizes the metabolic efficiency of microorganisms, contributing to achieving higher treatment efficiency at lower energy consumption.

[0052] In implementation, the multi-mode switching sewage treatment system further includes: an instrument and electric control system, which is used to call the opening and closing of valves according to one of the multi-modes (Mode 1, Mode 2, Mode 3, Mode 4) determined to be required by the sewage treatment system, and control the sewage treatment system to operate in one of the above multi-modes. The electric control system in this preferred embodiment can automatically judge and select an appropriate working mode according to the real-time sewage treatment requirements. This intelligent judgment and switching mechanism enables the system to switch to the optimal mode according to different operating conditions (such as water quality, flow rate changes, etc.), thereby improving the flexibility and adaptability of the sewage treatment process. Secondly, by precisely controlling the opening and closing of the gates and valves, the system can effectively adjust the water flow direction to ensure that the water flow rate and water quality in each treatment stage are optimized. This helps to maintain a stable sewage treatment effect while coping with seasonal changes or emergencies (such as excessive inflow during the rainy season).

[0053] It should be noted that according to the requirements of the sewage treatment system, different treatment modes are selected, and the electric control system enables the system to switch among multiple modes to ensure that ideal effluent water quality can still be achieved under different working conditions. For example, the system can select Mode 1 (high-quality effluent) under normal conditions and switch to Mode 2 for over-treatment during the rainy season to further reduce overflow pollution.

[0054] In Modes 3 and 4, by adjusting the treatment processes in the aerobic zone and the anoxic zone and combining the use of the packing, the electric control system helps to achieve low-cost and low-carbon emission operations while ensuring that the sewage treatment effect is not affected. Through precise control, the electric control system can minimize the consumption of energy and chemicals and reduce the operating costs of the system.

[0055] In addition, the automated control of the electric control system reduces manual intervention and improves the operation efficiency. The operator can quickly switch modes through the control system without manually adjusting each valve, reducing the management burden and improving the overall operation efficiency of the sewage treatment plant.

[0056] In summary, through automated and intelligent management, the electric control system greatly improves the flexibility, stability, efficiency, and energy conservation of the sewage treatment system, significantly reduces the operating costs, and enhances the water quality treatment capacity and the ability to cope with complex water quality changes.

[0057] In this embodiment, the operation modes are divided into four types: Mode 1 is the improved AAO (anaerobic - anoxic - aerobic) process, which can be used as a conventional operation mode to ensure high - quality effluent; Mode 2 is the improved multi - stage AO (anaerobic - aerobic process) process, which can be applied to treat excessive influent during the rainy season to relieve overflow pollution; Mode 3 is that on the basis of Mode 1, synchronous / shortcut nitrification - denitrification process can be realized in some areas to achieve low - cost and low - carbon - emission operation; Mode 4 is that on the basis of Mode 1, the main - process anaerobic ammonium oxidation process can be realized in some areas to greatly reduce the operation cost.

[0058] Through the above - mentioned embodiment and its preferred implementation manners, the following technical effects can be achieved:

[0059] (1) The sewage treatment system with multi - mode switching has a wide range of applications and can be widely used in various sewage treatment plants and reclaimed water plants.

[0060] (2) Under normal circumstances, operating in Mode 1 can achieve stable high - quality effluent.

[0061] (3) During the rainy season, switching to Mode 2 for operation, by separately feeding water into 4 anoxic zones, buffering the impact on the system caused by the increase in influent load, and at the same time improving the utilization of carbon sources in sewage during the denitrification process, the system can improve the treatment capacity on the premise of ensuring stable effluent compliance, thereby reducing overflow pollution and improving the water quality of the river.

[0062] (4) Adding fillers in Aerobic Zone 1 and switching to Mode 3 for operation, by creating local anoxic and aerobic micro - environments, realizing the synchronous / shortcut nitrification - denitrification process, and setting subsequent anoxic and aerobic zones to further ensure the effluent quality, the system can achieve low - cost and low - carbon - emission operation on the premise of ensuring stable effluent compliance.

[0063] (5) Adding fillers in Aerobic Zone 1 and Anoxic Zone 1 and switching to Mode 4 for operation, by creating local anoxic and aerobic micro - environments, realizing the main - process anaerobic ammonium oxidation process, and setting subsequent anoxic and aerobic zones to further ensure the effluent quality, the system can greatly reduce the operation cost on the premise of ensuring stable effluent compliance.

[0064] This embodiment provides a sewage treatment system with multi - mode switching. In this embodiment, it can switch and operate among Mode 1, Mode 2, Mode 3, and Mode 4. The following separately explains Mode 1, Mode 2, Mode 3, and Mode 4.

[0065] In this embodiment, usually, Mode 1 can be adopted for operation. See Figure 1, improved AAO process. The operation mode 1 is described below. The effluent from the primary sedimentation tank enters the total influent channel of the biological tank. Gate 1 and Gate 2 are opened, Gate 3, Gate 4, and Gate 5 are closed. Gate 6 or Gate 7 can be opened and closed according to the reflux requirement, that is, one can be opened and the other closed. Gate 8 and Gate 9 are opened, and Gate 10 is closed. The sewage treatment system water flow is treated through the pre-anoxic zone - anaerobic zone - anoxic zone 1 - aerobic zone 1 - anoxic zone 2 - aerobic zone 2 in sequence, and the effluent enters the subsequent secondary sedimentation tank. The sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone. In this mode 1, Valve 1, Valve 3, Valve 4, Valve 6, and Valve 7 are closed, and Valve 2 and Valve 5 are opened. When the SS of the sewage influent is low, the primary sedimentation tank can be bypassed and the sewage can directly enter the biological tank for treatment. At this time, Valve 1 is opened and Valve 2 is closed, and the states of other valves remain unchanged.

[0066] In this embodiment, refer to Figure 2 , the operation mode 2 is described as follows:

[0067] When it is necessary to treat the influent in excess during the rainy season, operation mode 2 is adopted, that is, the improved multi-stage AO process. The effluent from the primary sedimentation tank enters the total influent channel of the biological tank. Gate 1, Gate 2, Gate 3, Gate 4, and Gate 5 are opened simultaneously. Gate 6 and Gate 7 are opened or closed according to the operation requirement. Gate 8 and Gate 9 are opened, and Gate 10 is closed. The sewage treatment system water flow is treated through the pre-anoxic zone, anaerobic zone, anoxic zone 1 (the first anoxic zone), aerobic zone 1 (the first aerobic zone), anoxic zone 2 (the second anoxic zone), aerobic zone 2 (the second aerobic zone), anoxic zone 3 (the third anoxic zone), aerobic zone 3 (the third aerobic zone), anoxic zone 4 (the fourth anoxic zone), and aerobic zone 4 (the fourth aerobic zone) in sequence, and the effluent enters the subsequent secondary sedimentation tank. The sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone. In this mode, Valve 1, Valve 3, Valve 4, Valve 6, and Valve 7 are closed, and Valve 2 and Valve 5 are opened.

[0068] In this embodiment, refer to Figure 3 , the operation mode 3 is described as follows:

[0069] When low-cost and low-carbon emission operation is required, operation mode 3 can be adopted. In mode 3, packing needs to be added in aerobic zone 1, and either suspended packing or fixed packing can be used. The effluent from the primary sedimentation tank enters the total influent channel of the biological tank. Gate 1 and Gate 2 are opened, Gate 3, Gate 4, and Gate 5 are closed. Gate 6 or 7 can be opened and closed according to the reflux requirement, that is, one can be opened and the other closed. Gate 8 and Gate 9 are opened, and Gate 10 is closed. The water flow is treated through the pre-anoxic zone, anaerobic zone, anoxic zone 1, aerobic zone 1 (including packing), anoxic zone 2, and aerobic zone 2 in sequence, and the effluent enters the subsequent secondary sedimentation tank. The sludge from the secondary sedimentation tank is refluxed to the pre-anoxic zone. In this mode, Valve 1, Valve 3, Valve 4, Valve 6, and Valve 7 are closed, and Valve 2 and Valve 5 are opened.

[0070] In this embodiment, refer to Figure 4 , the operation mode 4 is described as follows:

[0071] When it is necessary to implement the main - process anammox process in some areas and explore the application of new processes, Mode 4 can be adopted for operation.

[0072] For Mode 4, packing needs to be added in anoxic zone 1 and aerobic zone 1, and either suspended packing or fixed packing can be used. In order to reduce the negative impact of organic matter on the anammox process, carbon separation needs to be carried out first. At this time, the sewage first enters the adsorption tank, and after fully adsorbing the organic matter, it enters the primary sedimentation tank for sedimentation. The effluent from the primary sedimentation tank enters the general inlet channel of the biological tank as the biological - tank influent. Gate 1 and Gate 2 are opened, Gate 3, Gate 4, and Gate 5 are closed. Gate 6 or Gate 7 can be opened and the other closed according to the reflux demand, and the reflux is to anoxic zone 2. Gate 8 and Gate 9 are closed, and Gate 10 is opened. The water flow passes through the pre - anoxic zone, anaerobic zone, anoxic zone 1 (with packing) (the first anoxic zone), aerobic zone 1 (with packing) (the first aerobic zone), anoxic zone 2 (the second anoxic zone), and aerobic zone 2 (the second aerobic zone) for treatment, and the effluent enters the subsequent secondary sedimentation tank. The sludge from the sedimentation tank is refluxed to the pre - anoxic zone, and the sludge from the secondary sedimentation tank is refluxed to anoxic zone 2. In this mode, Valve 1, Valve 2, and Valve 5 are closed, and Valve 3, Valve 4, Valve 6, and Valve 7 are opened.

[0073] It should be noted that the sewage treatment provided according to this embodiment can meet different sewage - treatment requirements. Specifically: Mode 1 is the conventional operation mode to ensure high - quality effluent; Mode 2 can be applied to the over - treatment of influent during the rainy season to relieve the overflow pollution; Mode 3 realizes low - cost and low - carbon - emission operation; Mode 4 greatly reduces the operation cost through the main - process anammox process.

[0074] The following embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those skilled in the art, other different forms of changes or variations can be made based on the following description, and these various changes, modifications, substitutions, and deformations derived from the principles and spirits of the present invention still fall within the protection scope of the present invention.

[0075] The above - mentioned are only the preferred embodiments of the present invention, and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-mode switching sewage treatment system, characterized in that: include: A primary sedimentation tank, a biological tank and a secondary sedimentation tank, wherein the biological tank comprises a tank body, a partition wall, a gate, a filler, an agitator, an aeration system, a nitrification liquid return pump, a pipeline and a valve system; the tank body constitutes a biological reaction tank; the partition wall divides the biological reaction tank into a pre-anoxic zone, an anaerobic zone, an anoxic zone and an aerobic zone; the gate is arranged on the partition wall, and the water flow direction of the sewage treatment system is adjusted by opening and closing the gate, and the nitrification liquid return pump adjusts the water quality of the return liquid by opening and closing the gate to switch to different modes of the multi-mode of the sewage treatment system; the pipeline and valve system control the flow of sewage, sludge and air, and the different modes of the multi-mode are switched by opening and closing the gate and adjusting the position of the filler.

2. The sewage treatment system according to claim 1, characterized in that: The multi-mode sewage treatment system includes: The water flow direction of mode 1 is: primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, and secondary sedimentation tank, wherein the sludge in the secondary sedimentation tank is returned to the pre-anoxic zone; The water flow direction of mode 2 is: the primary sedimentation tank, the pre-anoxic zone, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone, the third anoxic zone, the third aerobic zone, the fourth anoxic zone, the fourth aerobic zone, the secondary sedimentation tank, wherein the sludge of the secondary sedimentation tank is returned to the pre-anoxic zone; The water flow direction of mode 3 is: the primary sedimentation tank, the pre-anoxic zone, the anaerobic zone, the first anoxic zone, the first aerobic zone, the second anoxic zone, the second aerobic zone, and the secondary sedimentation tank. The sludge in the secondary sedimentation tank is returned to the pre-anoxic zone, and the first aerobic zone is provided with fillers; The water flow direction of mode 4 is: adsorption tank, primary sedimentation tank, pre-anoxic zone, anaerobic zone, first anoxic zone, first aerobic zone, second anoxic zone, second aerobic zone, and second sedimentation tank. The sludge in the second sedimentation tank is returned to the second anoxic zone, and the first aerobic zone and the first anoxic zone are both provided with the filler.

3. The sewage treatment system according to claim 2, characterized in that: Mode 4 requires that the pre-anoxic tank of the biological pool be used as an adsorption tank for carbon separation, and the primary sedimentation tank be used as a sedimentation tank for carbon separation.

4. The sewage treatment system according to any one of claims 1 to 3, characterized in that: The preset area of ​​the sewage treatment system adopts a perforated pipe aeration method, and the anoxic zone and the aerobic zone are switched by controlling the dissolved oxygen.

5. The sewage treatment system according to any one of claims 1 to 3, characterized in that: The nitrification liquid reflux pump is arranged on the partition wall between the aerobic zone and the anoxic zone, and refluxes the nitrification liquid to different anoxic zones according to one of the multiple modes of operation of the sewage treatment system, and performs switching control of the reflux liquid.

6. The sewage treatment system according to any one of claims 1 to 3, characterized in that: The filler includes: a suspended filler or a fixed filler, the filler is detachable, and the setting position is set according to different modes of the multi-mode.

7. The sewage treatment system according to claim 6, characterized in that: In the mode 3, the filler is arranged in the aerobic zone; In the mode 4, the fillers are arranged in the anoxic zone and the aerobic zone.

8. The sewage treatment system according to any one of claims 1 to 3, characterized in that: Also includes: The instrument and electronic control system are used to call the valve to open and close according to one mode among the multiple modes required by the sewage treatment system, so as to control the sewage treatment system to work in the one mode.

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