Denitrification sewage treatment device capable of controlling addition of carbon source

Abstract

The utility model discloses a denitrification sewage treatment device for controlling carbon source feeding, which comprises an anaerobic tank, an aerobic tank, an anoxic tank and a sedimentation tank which are connected in sequence, and further comprises a carbon source feeding device, the carbon source feeding device is connected with the anaerobic tank and the anoxic tank, nitrate nitrogen detectors are arranged at a water inlet of the anaerobic tank and a water outlet of the aerobic tank, and the nitrate nitrogen detectors are connected with the sedimentation tank. The sedimentation tank is communicated with the anaerobic tank through a first sludge return pipeline, the sedimentation tank is communicated with the anoxic tank through a second sludge return pipeline, and sludge pumps are arranged on the first sludge return pipeline and the second sludge return pipeline. According to the scheme, the carbon source can be reasonably added, the treatment cost is reduced, and the treatment efficiency is improved; carbon source feeding of the carbon source feeding device is reduced, the treatment cost is reduced, and the utilization rate of the carbon source can be increased to a greater extent. Under the precise control of the nitrate nitrogen detectors at the water inlet of the anaerobic tank and the water outlet of the aerobic tank and the carbon source feeding device, the utilization rate of the carbon source is increased, and the treatment cost is reasonably reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a denitrification wastewater treatment device for controlling the addition of carbon sources. Background Technology

[0002] With increasingly stringent wastewater discharge standards, wastewater treatment plants need to strengthen their denitrification processes to ensure effluent meets standards. Denitrification is a crucial step in biological nitrogen removal from wastewater, and the addition of carbon sources is essential for improving denitrification efficiency. This is especially true for post-denitrification wastewater treatment units, where the anoxic zone is placed after the aerobic zone, operating in an anaerobic-aerobic-anoxic manner (AOA process). In traditional AOA processes, phosphorus removal and denitrification are completed in the aerobic and anoxic zones respectively, requiring the addition of external carbon sources to provide carbon to the anoxic section. However, in existing post-denitrification wastewater treatment units, carbon sources are added manually or quantitatively, resulting in low efficiency and excessive dosage, low carbon source utilization, and inappropriate carbon source addition not only increases treatment costs but also leads to increased sludge production, putting pressure on the economic efficiency and sustainable development of wastewater treatment plants.

[0003] For example, Chinese Patent Publication No. CN102153236A, published on August 17, 2011, entitled "A Post-denitrification Wastewater Treatment Device and Process," includes an inlet tank, a biological treatment tank, a sedimentation tank, and an outlet tank connected in sequence. The biological treatment tank includes three parts: an anaerobic zone, an aerobic zone, and an anoxic zone. A mixer is installed in the anaerobic zone and the anoxic zone. The anaerobic zone is connected to the anoxic zone through a carbon source diversion pipe. An aeration head is installed in the aerobic zone. The aeration head, a gas flow meter, and an air pump are connected in sequence. The sedimentation tank includes a central pipe, a reflector plate, a tank body, an outlet weir, and an outlet. The bottom of the sedimentation tank is connected to the anaerobic zone of the biological treatment tank through a sludge return pipe.

[0004] The drawbacks of existing patents are: in existing post-denitrification wastewater treatment devices, carbon sources are added manually or quantitatively, resulting in low carbon source addition efficiency and low carbon source utilization. Unreasonable carbon source addition not only increases treatment costs but also leads to an increase in sludge production, putting pressure on the economic benefits and sustainable development of wastewater treatment plants. Utility Model Content

[0005] The purpose of this invention is to solve the problems of low carbon source addition efficiency, low carbon source utilization rate, and high treatment cost in existing post-denitrification wastewater treatment devices, which rely on manual or quantitative addition of carbon sources. The invention provides a denitrification wastewater treatment device that can rationally add carbon sources, reduce treatment costs, and improve treatment efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A denitrification wastewater treatment device for controlling carbon source addition includes an anaerobic tank, an aerobic tank, an anoxic tank, and a sedimentation tank connected in sequence. It also includes a carbon source addition device connected to the anaerobic tank and the anoxic tank. The inlet of the anaerobic tank and the outlet of the aerobic tank are both equipped with nitrate nitrogen detectors. The sedimentation tank is connected to the anaerobic tank through a first sludge return pipeline and to the anoxic tank through a second sludge return pipeline. Both the first and second sludge return pipelines are equipped with sludge pumps. This technical solution describes a denitrification wastewater treatment device for controlling carbon source addition. A nitrate nitrogen detector, capable of detecting nitrate nitrogen concentration and outputting a detection signal, is installed at the inlet of the anaerobic tank and the outlet of the aerobic tank. The concentration of nitrate nitrogen in the wastewater entering the anaerobic tank is detected, thereby controlling the amount of carbon source added to the anaerobic tank by the carbon source addition device. After reacting in the anaerobic and aerobic tanks, the wastewater enters the anoxic tank. The concentration of nitrate nitrogen in the wastewater discharged from the aerobic tank is detected, which is equivalent to the concentration of nitrate nitrogen in the wastewater entering the anaerobic tank. This determines whether to compensate for the amount of carbon source added to the anaerobic tank and controls the amount of carbon source added to the anoxic tank by the carbon source addition device. Both the carbon source addition device and the nitrate nitrogen detector are connected through a control device, and the detection signal from the nitrate nitrogen detector controls the precise addition of carbon source by the carbon source addition device.

[0008] Furthermore, the sedimentation tank is connected to the anaerobic tank via a first sludge return pipeline, and to the anoxic tank via a second sludge return pipeline. Both pipelines are equipped with sludge pumps. Sludge is returned to the anaerobic and anoxic tanks via these pumps. This serves two purposes: firstly, it regulates the sludge concentration in the reaction tanks, maintaining a certain microbial concentration; secondly, it allows wastewater to accumulate a certain amount of endogenous carbon source through the sequential reactions in the aerobic and anoxic tanks. This endogenous carbon source is then provided to the anaerobic and anoxic tanks via sludge return, reducing the need for carbon source dosing and improving the utilization rate of carbon sources in the wastewater. This lowers treatment costs and further enhances carbon source utilization. With precise control of carbon source dosing via nitrate nitrogen detectors at the inlet of the anaerobic tank and the outlet of the aerobic tank, and the use of carbon source dosing devices, carbon source utilization is improved, and treatment costs are reasonably reduced.

[0009] Preferably, the sludge pumps on both the first and second sludge return pipelines are intermittent sludge pumps. Intermittent sludge discharge reduces the time and frequency of water pumping and sludge discharge, thereby saving energy and reducing maintenance costs. It also prevents large amounts of treated water from re-entering the anaerobic and anoxic tanks during continuous return, thus improving the sludge return rate and enhancing the effectiveness of sludge return.

[0010] Preferably, the system also includes a water tank for storing the wastewater to be treated, with the outlet of the water tank connected to the inlet of the anaerobic tank. In this technical solution, the wastewater to be treated is stored in the water tank and enters the anaerobic tank from the inlet.

[0011] Preferably, a buffer tank is added after the anoxic tank. The buffer tank is equipped with a post-aeration device. The inlet of the buffer tank is connected to the outlet of the anoxic tank, and the outlet of the buffer tank is connected to the inlet of the sedimentation tank. The post-aeration device is an oxygen supply device. When the mixed liquor enters the buffer tank, oxygen is supplied to the mixed liquor through the post-aeration device, which can inhibit the denitrification reaction of wastewater, reduce nitrogen production, and thus improve sludge settling performance. It also disrupts the anoxic environment at the inlet of the sedimentation tank, thereby improving the sludge settling effect in the sedimentation tank and preventing sludge overflow. While improving the sludge settling effect in the mixed liquor, it also promotes sludge return and the overall circulation of wastewater in the reaction tank.

[0012] Preferably, both the anaerobic and anoxic tanks are equipped with a stirrer, and the carbon source dosing device includes a carbon source dosing port located below the stirrer. The carbon source dosing port sprays upwards and is stirred by the stirrer to achieve uniform mixing of the carbon source and wastewater.

[0013] Preferably, multiple anaerobic, anoxic, and aerobic tanks are provided and connected by water holes that are staggered vertically according to the direction of water flow.

[0014] Preferably, the aerobic tank is equipped with a pre-aeration device.

[0015] A denitrification wastewater treatment device for controlling carbon source addition includes an anaerobic tank, an aerobic tank, an anoxic tank, and a sedimentation tank connected in sequence. It also includes a carbon source addition device connected to the anaerobic and anoxic tanks. Nitrate nitrogen detectors are installed at the inlet of the anaerobic tank and the outlet of the aerobic tank. A pre-anoxic tank is added before the anaerobic tank. The sedimentation tank is connected to the pre-anoxic tank via a first sludge return pipeline, and the sedimentation tank is connected to the anoxic tank via a second sludge return pipeline. Sludge pumps are installed on both the first and second sludge return pipelines. When there is sufficient sediment in the wastewater to be treated, this technical solution adds a pre-anoxic tank before the anaerobic tank. Part of the sludge from the sedimentation tank is returned to the pre-anoxic tank through the first sludge return pipeline. In terms of denitrification, the pre-anoxic tank provides an anaerobic environment, enabling heterotrophic bacteria to utilize the organic matter in the wastewater to reduce nitrate and nitrite nitrogen to nitrogen gas, thereby removing nitrogen pollutants from the wastewater. Denitrification is performed before sludge return to prevent excessive nitrate nitrogen from damaging the anaerobic environment of the anaerobic tank.

[0016] In phosphorus removal, the pre-anoxic tank promotes anaerobic phosphorus release in the anaerobic tank, improving the phosphorus removal rate. Pretreatment in the pre-anoxic tank removes nitrates from the returned sludge, ensuring low nitrate concentrations in the anaerobic tank influent, thus enhancing the system's phosphorus removal efficiency. This also results in polyphosphate-accumulating bacteria outperforming nitrifying bacteria in both the anaerobic and aerobic tanks, preventing excessive carbon source consumption and increased treatment costs. This approach achieves energy-saving, stable, and highly efficient nitrogen and phosphorus removal.

[0017] Simultaneously, nitrate nitrogen detectors, capable of detecting nitrate nitrogen concentration and outputting detection signals, are installed at the inlet of the anaerobic tank and the outlet of the aerobic tank. These detectors monitor the nitrate nitrogen concentration in the wastewater entering the anaerobic tank, thereby controlling the amount of carbon source added to the anaerobic tank by the carbon source dosing device. After reacting in the anaerobic and aerobic tanks, the wastewater enters the anoxic tank. The concentration of nitrate nitrogen in the wastewater discharged from the aerobic tank is detected, which is equivalent to the concentration of nitrate nitrogen in the wastewater entering the anaerobic tank. This determines whether to compensate for the amount of carbon source added to the anaerobic tank and controls the amount of carbon source added to the anoxic tank by the carbon source dosing device. Both the carbon source dosing device and the nitrate nitrogen detector are connected to a control device, using the detection signal from the nitrate nitrogen detector to control the precise addition of carbon source by the carbon source dosing device.

[0018] Preferably, the sludge pumps on both the first and second sludge return pipelines are intermittent sludge pumps. Intermittent sludge discharge reduces the time and frequency of water pumping and sludge discharge, thereby saving energy and reducing maintenance costs. It also prevents large amounts of treated water from re-entering the anaerobic and anoxic tanks during continuous return, thus improving the sludge return rate and enhancing the effectiveness of sludge return.

[0019] Preferably, the system also includes a water tank for storing wastewater to be treated, with the outlet of the water tank connected to the inlet of the pre-anoxic tank.

[0020] Therefore, this utility model has the following beneficial effects: it can reasonably add carbon sources, reduce treatment costs, and improve treatment efficiency; it reduces the amount of carbon source added by the carbon source addition device, thereby reducing treatment costs and improving the utilization rate of carbon sources to a greater extent; under the precise control of carbon source addition by the nitrate nitrogen detector at the inlet of the anaerobic tank and the outlet of the aerobic tank, the carbon source utilization rate is improved, and the treatment cost is reasonably reduced; improving the utilization rate of carbon sources greatly reduces the cost of wastewater treatment. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of one embodiment of the present utility model.

[0022] Figure 2 This is a structural schematic diagram of a second embodiment of the present invention.

[0023] As shown in the picture:

[0024] Anaerobic tank 1

[0025] 2. Aerobic tank, 2.1. Pre-aeration device

[0026] Anoxic tank 3, sedimentation tank 4

[0027] 5. Carbon source dosing device; 5.1. Carbon source dosing port.

[0028] 6. Nitrate nitrogen detector; 7. First sludge return pipeline; 8. Second sludge return pipeline; 9. Sludge pump; 10. Water tank.

[0029] Buffer tank 11, Post-aeration device 11.1,

[0030] 12. Pre-anoxic tank; 13. Agitator. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Example 1, as Figure 1 The denitrification wastewater treatment device shown includes an anaerobic tank 1, an aerobic tank 2, an anoxic tank 3, and a sedimentation tank 4 connected in sequence. It also includes a carbon source dosing device 5, which is connected to the anaerobic tank 1 and the anoxic tank 3. The inlet of the anaerobic tank 1 and the outlet of the aerobic tank 2 are both equipped with nitrate nitrogen detectors 6. The sedimentation tank 4 is connected to the anaerobic tank 1 through a first sludge return pipeline 7 and to the anoxic tank 3 through a second sludge return pipeline 8. Both the first sludge return pipeline 7 and the second sludge return pipeline 8 are equipped with sludge pumps 9.

[0033] With increasingly stringent wastewater discharge standards, wastewater treatment plants need to strengthen their denitrification processes to ensure effluent meets standards. Denitrification is a crucial step in biological wastewater denitrification, and the addition of carbon sources is essential for improving denitrification efficiency. This is especially true for post-denitrification wastewater treatment units, where the anoxic zone is placed after the aerobic zone, operating in an anaerobic-aerobic-anoxic manner (AOA process). In traditional AOA processes, phosphorus removal and denitrification are completed in the aerobic and anoxic zones respectively, requiring the addition of external carbon sources to provide carbon to the anoxic section. However, in existing post-denitrification wastewater treatment units, carbon sources are added manually or quantitatively, resulting in low efficiency and unreasonable addition, leading to unstable denitrification effects. Unreasonable carbon source addition not only increases treatment costs but also leads to increased sludge production, putting pressure on the economic efficiency and sustainable development of wastewater treatment plants.

[0034] To address the problems of low and unreasonable carbon source addition, unstable nitrogen removal effect, and high treatment cost in existing post-denitrification wastewater treatment devices, which involve manual or quantitative carbon source addition, this paper proposes a denitrification wastewater treatment device that can rationally add carbon sources, reduce treatment costs, and improve treatment efficiency. For example... Figure 1As shown in the above embodiment, a denitrification wastewater treatment device for controlling carbon source addition uses a nitrate nitrogen detector 6 installed at the inlet of anaerobic tank 1 and the outlet of aerobic tank 2 to detect nitrate nitrogen concentration and output a detection signal. The nitrate nitrogen concentration in the wastewater entering anaerobic tank 1 is detected, thereby controlling the amount of carbon source added to anaerobic tank 1 by the carbon source addition device 5. After reacting in anaerobic tank 1 and aerobic tank 2, the wastewater enters anoxic tank 3. The concentration of nitrate nitrogen in the wastewater discharged from aerobic tank 2 is detected, which is equivalent to the concentration of nitrate nitrogen in the wastewater entering anaerobic tank 1. This determines whether to compensate for the amount of carbon source added to anaerobic tank 1 and controls the amount of carbon source added to anoxic tank 3 by the carbon source addition device 5. Both the carbon source addition device 5 and the nitrate nitrogen detector 6 are connected to a control device, and the carbon source addition by the carbon source addition device 5 is controlled by the detection signal from the nitrate nitrogen detector 6.

[0035] Furthermore, such as Figure 1 As shown, sedimentation tank 4 is connected to anaerobic tank 1 via a first sludge return pipe 7, and to anoxic tank 3 via a second sludge return pipe 8. Both the first and second sludge return pipes 7 and 8 are equipped with sludge pumps 9. Sludge is returned to anaerobic tank 1 and anoxic tank 3 via these pumps. This serves two purposes: firstly, to regulate the sludge concentration in the reaction tanks, maintaining a certain microbial concentration; and secondly, to allow wastewater to accumulate a certain amount of endogenous carbon source through the sequential reaction in aerobic tank 2 and anoxic tank 3. This endogenous carbon source is then provided to anaerobic tank 1 and anoxic tank 3 via sludge return, reducing the need for carbon source addition via carbon source dosing device 5, lowering treatment costs, and maximizing carbon source utilization. With precise control of carbon source addition via nitrate nitrogen detector 6 at the inlet of anaerobic tank 1 and carbon source dosing device 5 at the outlet of aerobic tank 2, carbon source utilization is improved, and treatment costs are reasonably reduced.

[0036] Further optimizations were made to sludge pump 9, such as... Figure 1 As shown, the sludge pumps 9 on the first sludge return pipeline 7 and the second sludge return pipeline 8 are both intermittent sludge pumps 9. Intermittent sludge discharge can reduce the time and frequency of water pumping and sludge discharge, thereby saving energy and reducing maintenance costs. It also prevents the treated water from re-entering the anaerobic and anoxic tanks in large quantities during continuous return, thereby improving the sludge return rate and enhancing the effect of sludge return.

[0037] Specifically, such as Figure 1 As shown, it also includes a water tank 10 for storing wastewater to be treated, and the outlet of the water tank 10 is connected to the inlet of the anaerobic tank 1. In this technical solution, the wastewater to be treated is stored in the water tank 10 and enters the anaerobic tank 1 from the inlet of the anaerobic tank 1.

[0038] Further optimization of anoxic pool 3, such as... Figure 1As shown, a buffer tank 11 is added after the anoxic tank 3. The buffer tank 11 is equipped with a post-aeration device 11.1. The inlet of the buffer tank 11 is connected to the outlet of the anoxic tank 3, and the outlet of the buffer tank 11 is connected to the inlet of the sedimentation tank 4. The post-aeration device 11.1 is an oxygen supply device. When the mixed liquor enters the buffer tank 11, oxygen is supplied to the mixed liquor through the post-aeration device 11.1, which can inhibit the denitrification reaction of wastewater, reduce nitrogen production, and thus improve sludge settling performance. It also disrupts the anoxic environment at the inlet of the sedimentation tank 4, thereby improving the sludge settling effect in the sedimentation tank 4 and preventing sludge overflow in the sedimentation tank 4. While improving the sludge settling effect in the mixed liquor, it also promotes sludge return and the overall circulation of wastewater in the reaction tank.

[0039] In this embodiment, as Figure 1 As shown, both the anaerobic tank 1 and the anoxic tank 3 are equipped with a stirrer 13.

[0040] Further optimization of carbon source dosing device 5, such as... Figure 1 As shown, the carbon source dosing device 5 includes a carbon source dosing port 5.1, which is located below the agitator 13. The carbon source dosing port 5.1 sprays upwards and is stirred by the agitator 13, thereby achieving uniform mixing of the carbon source and wastewater.

[0041] Specifically, such as Figure 1 As shown, multiple anaerobic tanks 1, anoxic tanks 3, and aerobic tanks 2 are provided and connected by water holes that are staggered vertically according to the direction of water flow. Aerobic tank 2 is equipped with a pre-aeration device 2.1.

[0042] like Figure 1 As shown, the above embodiments can reasonably add carbon sources, reduce treatment costs, and improve treatment efficiency; reducing the amount of carbon source added by the carbon source addition device 5 lowers treatment costs and can improve the utilization rate of carbon sources to a greater extent. With the precise control of carbon source addition by the nitrate nitrogen detector 6 at the inlet of anaerobic tank 1 and the outlet of aerobic tank 2 and the carbon source addition device 5, the carbon source utilization rate is improved and the treatment cost is reasonably reduced.

[0043] Example 2, as Figure 2 The denitrification wastewater treatment device shown includes an anaerobic tank 1, an aerobic tank 2, an anoxic tank 3, and a sedimentation tank 4 connected in sequence. It also includes a carbon source dosing device 5, which is connected to the anaerobic tank 1 and the anoxic tank 3. The inlet of the anaerobic tank 1 and the outlet of the aerobic tank 2 are both equipped with nitrate nitrogen detectors 6. A pre-anoxic tank 123 is added before the anaerobic tank 1. The sedimentation tank 4 is connected to the pre-anoxic tank 123 through a first sludge return pipeline 7. The sedimentation tank 4 is connected to the anoxic tank 3 through a second sludge return pipeline 8. Both the first sludge return pipeline 7 and the second sludge return pipeline 8 are equipped with sludge pumps 9.

[0044] With increasingly stringent wastewater discharge standards, wastewater treatment plants need to strengthen their denitrification processes to ensure effluent meets standards. Denitrification is a crucial step in biological wastewater denitrification, and the addition of carbon sources is essential for improving denitrification efficiency. This is especially true for post-denitrification wastewater treatment units, where the anoxic zone is placed after the aerobic zone, operating in an anaerobic-aerobic-anoxic manner (AOA process). In traditional AOA processes, phosphorus removal and denitrification are completed in the aerobic and anoxic zones respectively, requiring the addition of external carbon sources to provide carbon to the anoxic section. However, in existing post-denitrification wastewater treatment units, carbon sources are added manually or quantitatively, resulting in low efficiency and unreasonable addition, leading to unstable denitrification effects. Unreasonable carbon source addition not only increases treatment costs but also leads to increased sludge production, putting pressure on the economic efficiency and sustainable development of wastewater treatment plants.

[0045] To address the problems of low and unreasonable carbon source addition, unstable nitrogen removal effect, and high treatment cost in existing post-denitrification wastewater treatment devices, which involve manual or quantitative carbon source addition, this paper proposes a denitrification wastewater treatment device that can rationally add carbon sources, reduce treatment costs, and improve treatment efficiency. For example... Figure 2 As shown, in the above embodiment, a pre-anoxic tank 123 is added before the anaerobic tank 1. Part of the sludge from the sedimentation tank 4 is returned to the pre-anoxic tank 123 through a first sludge return management system. In terms of denitrification, the pre-anoxic tank 123 provides an anoxic environment, enabling heterotrophic bacteria to utilize organic matter in the wastewater to reduce nitrate and nitrite nitrogen to nitrogen gas, thereby removing nitrogen pollutants from the wastewater. Denitrification is performed before sludge return to prevent excessive nitrate nitrogen from damaging the anaerobic environment of the anaerobic tank 1.

[0046] like Figure 2 As shown, in terms of phosphorus removal, the pre-anoxic tank 123 can promote anaerobic phosphorus release in the anaerobic tank 1, thereby improving the phosphorus removal rate. Through pretreatment in the pre-anoxic tank 123, nitrates in the returned sludge are removed, ensuring a low concentration of nitrates in the influent to the anaerobic tank 1, thus enhancing the phosphorus removal effect of the system. This results in polyphosphate-accumulating bacteria outperforming nitrifying bacteria in both the anaerobic tank 1 and the aerobic tank 2, achieving energy-saving, stable, and highly efficient nitrogen and phosphorus removal.

[0047] Further optimizations were made to sludge pump 9, such as... Figure 2 As shown, the sludge pumps 9 on the first sludge return pipeline 7 and the second sludge return pipeline 8 are both intermittent sludge pumps 9. Intermittent sludge discharge can reduce the time and frequency of water pumping and sludge discharge, thereby saving energy and reducing maintenance costs. It also prevents the treated water from re-entering the anaerobic and anoxic tanks in large quantities during continuous return, thereby improving the sludge return rate and enhancing the effect of sludge return.

[0048] Specifically, such as Figure 2As shown, it also includes a water tank 10 for storing wastewater to be treated, and the outlet of the water tank 10 is connected to the inlet of the pre-anoxic tank 123.

[0049] Further optimization of anoxic pool 3, such as... Figure 2 As shown, a buffer tank 11 is added after the anoxic tank 3. The buffer tank 11 is equipped with a post-aeration device 11.1. The inlet of the buffer tank 11 is connected to the outlet of the anoxic tank 3, and the outlet of the buffer tank 11 is connected to the inlet of the sedimentation tank 4. The post-aeration device 11.1 is an oxygen supply device. When the mixed liquor enters the buffer tank 11, oxygen is supplied to the mixed liquor through the post-aeration device 11.1, which can inhibit the denitrification reaction of wastewater, reduce nitrogen production, and thus improve sludge settling performance. It also disrupts the anoxic environment at the inlet of the sedimentation tank 4, thereby improving the sludge settling effect in the sedimentation tank 4 and preventing sludge overflow in the sedimentation tank 4. While improving the sludge settling effect in the mixed liquor, it also promotes sludge return and the overall circulation of wastewater in the reaction tank.

[0050] In this embodiment, as Figure 2 As shown, both the anaerobic tank 1 and the anoxic tank 3 are equipped with a stirrer 13.

[0051] Further optimization of carbon source dosing device 5, such as... Figure 2 As shown, the carbon source dosing device 5 includes a carbon source dosing port 5.1, which is located below the agitator 13. The carbon source dosing port 5.1 sprays upwards and is stirred by the agitator 13, thereby achieving uniform mixing of the carbon source and wastewater.

[0052] Specifically, such as Figure 2 As shown, multiple anaerobic tanks 1, anoxic tanks 3, and aerobic tanks 2 are provided and connected by water holes that are staggered vertically according to the direction of water flow. Aerobic tank 2 is equipped with a pre-aeration device 2.1.

[0053] like Figure 2 As shown, the above embodiments can reasonably add carbon sources, reduce treatment costs, and improve treatment efficiency; reducing the amount of carbon source added by the carbon source addition device 5 lowers treatment costs and can improve the utilization rate of carbon sources to a greater extent. With the precise control of carbon source addition by the nitrate nitrogen detector 6 at the inlet of anaerobic tank 1 and the outlet of aerobic tank 2 and the carbon source addition device 5, the carbon source utilization rate is improved and the treatment cost is reasonably reduced.

[0054] The specific embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the specific scope of implementation of this utility model. All equivalent changes made to the shape and structure of this utility model should be included within the protection scope of this utility model.

Claims

1. A denitrification wastewater treatment device for controlling carbon source addition, comprising an anaerobic tank, an aerobic tank, an anoxic tank, and a sedimentation tank connected in sequence, characterized in that, It also includes a carbon source dosing device, which is connected to the anaerobic tank and the anoxic tank. The inlet of the anaerobic tank and the outlet of the aerobic tank are both equipped with nitrate nitrogen detectors. The sedimentation tank is connected to the anaerobic tank through the first sludge return pipeline, and the sedimentation tank is connected to the anoxic tank through the second sludge return pipeline. Both the first sludge return pipeline and the second sludge return pipeline are equipped with sludge pumps.

2. The denitrification wastewater treatment device for controlling carbon source addition according to claim 1, characterized in that, The sludge pumps on the first and second sludge return pipelines are both intermittent sludge pumps.

3. A denitrification wastewater treatment device for controlling carbon source addition according to claim 1 or 2, characterized in that, It also includes a water tank for storing wastewater to be treated, the outlet of which is connected to the inlet of the anaerobic tank.

4. A denitrification wastewater treatment device for controlling carbon source addition according to claim 1 or 2, characterized in that, A buffer tank is added after the anoxic tank. The buffer tank is equipped with a post-aeration device. The inlet of the buffer tank is connected to the outlet of the anoxic tank, and the outlet of the buffer tank is connected to the inlet of the sedimentation tank.

5. A denitrification wastewater treatment device for controlling carbon source addition according to claim 1 or 2, characterized in that, Both the anaerobic and anoxic tanks are equipped with stirrers, and the carbon source addition device includes a carbon source addition port located below the stirrer.

6. A denitrification wastewater treatment device for controlling carbon source addition according to claim 1 or 2, characterized in that, Multiple anaerobic, anoxic, and aerobic tanks are provided and connected by water holes that are staggered vertically according to the direction of water flow.

7. A denitrification wastewater treatment device for controlling carbon source addition according to claim 1 or 2, characterized in that, The aerobic tank is equipped with a pre-aeration device.

8. A denitrification wastewater treatment device for controlling carbon source addition, comprising an anaerobic tank, an aerobic tank, an anoxic tank, and a sedimentation tank connected in sequence, characterized in that, It also includes a carbon source dosing device, which is connected to the anaerobic tank and the anoxic tank. The inlet of the anaerobic tank and the outlet of the aerobic tank are both equipped with nitrate nitrogen detectors. A pre-anoxic tank is added before the anaerobic tank. The sedimentation tank is connected to the pre-anoxic tank through the first sludge return pipeline, and the sedimentation tank is connected to the anoxic tank through the second sludge return pipeline. Sludge pumps are installed on both the first and second sludge return pipelines.

9. A denitrification wastewater treatment device for controlling carbon source addition according to claim 8, characterized in that, The sludge pumps on the first and second sludge return pipelines are both intermittent sludge pumps.

10. A denitrification wastewater treatment device for controlling carbon source addition according to claim 8 or 9, characterized in that, It also includes a water tank for storing wastewater to be treated, the outlet of which is connected to the inlet of the pre-anoxic tank.

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