High-efficiency combined system for sewage biochemical treatment tank

Abstract

The utility model relates to the technical field of sewage biochemical treatment, in particular to an efficient combined system of a sewage biochemical treatment tank. The efficient combined system for the sewage biochemical treatment tank comprises a filtering and impurity removing tank, an anaerobic reaction tank, a primary reverse filter, an anoxic tank, a secondary reverse filter, an aerobic tank and a thermal disinfection tank which are connected in sequence, a sewage inlet pipeline is arranged on the filtering impurity removal tank, a hemispherical disperser is arranged in the anaerobic reaction tank, an aerobic tank coil pipe is arranged in the aerobic tank, a heat disinfection tank coil pipe is arranged in the heat disinfection tank, and the heat disinfection tank coil pipe is connected with the aerobic tank coil pipe through a communication pipeline. And the upper part of the hemispherical disperser is arc-shaped. According to the system, the primary reverse filter, the secondary reverse filter and the coagulant preparation tank are matched; the filter plate intercepts impurities to create a stable microbial reaction environment for the aerobic tank, so that the influence of excessive impurities on microbial activity is avoided, and the possibility of abnormal reproduction of filamentous bacteria is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater biochemical treatment technology, specifically to a high-efficiency continuous system for wastewater biochemical treatment ponds. Background Technology

[0002] Wastewater biological treatment systems, as a key technology in the field of wastewater treatment, utilize the metabolic processes of microorganisms to convert organic pollutants in wastewater into harmless substances such as carbon dioxide and water, thereby achieving wastewater purification and compliant discharge. With increasingly stringent environmental protection requirements and the continuous increase in wastewater discharge, higher demands are being placed on the treatment efficiency, stability, and energy consumption of wastewater biological treatment systems.

[0003] However, current wastewater biological treatment equipment has many problems that urgently need to be solved. Regarding sludge treatment, sludge bulking is a frequent occurrence. Excessive proliferation of filamentous bacteria in the aerobic tank leads to deterioration of sludge settling performance and difficulty in sludge-water separation, affecting not only effluent quality but also increasing the difficulty and cost of sludge treatment. In terms of temperature adaptability, in low-temperature winter environments, the activity of bacteria in the aerobic tank significantly decreases, and the metabolic rate of microorganisms slows down, resulting in a substantial drop in wastewater treatment efficiency. Using traditional direct heating methods to raise the temperature of the aerobic tank to maintain bacterial activity consumes a large amount of energy, increasing operating costs. Furthermore, in the anaerobic reaction stage, the uneven dispersion of wastewater in the anaerobic reactor prevents sufficient contact between microorganisms and organic matter in the wastewater, limiting the efficiency of the anaerobic reaction and consequently affecting the overall treatment effect of the biological treatment system. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly efficient, interconnected wastewater biological treatment system. This system utilizes a primary reverse filter, a secondary reverse filter, and a coagulant preparation tank. On one hand, the filter plates intercept impurities, creating a stable microbial reaction environment for the aerobic tank and preventing excessive impurities from affecting microbial activity, thus reducing the possibility of abnormal filamentous bacteria growth. On the other hand, the sludge return port sends filtered sludge back to the anaerobic and anoxic tanks, maintaining sludge balance in each tank and preventing excessive sludge accumulation in certain areas, thereby reducing the causes of sludge bulking at the source. Simultaneously, the coagulant preparation tank and spray plates enhance sedimentation, ensuring stable sludge treatment and improving effluent quality.

[0005] This utility model is achieved using the following technical solution:

[0006] The aforementioned high-efficiency interconnected wastewater biological treatment system includes, in sequence, a filtration and impurity removal tank, an anaerobic reactor, a primary reverse filter, an anoxic tank, a secondary reverse filter, an aerobic tank, and a thermal disinfection tank. The filtration and impurity removal tank is equipped with a wastewater inlet pipe. The anaerobic reactor contains a hemispherical disperser, the aerobic tank contains an aerobic tank coil, and the thermal disinfection tank contains a thermal disinfection tank coil. The thermal disinfection tank coil is connected to the aerobic tank coil via a connecting pipe. The hemispherical disperser has an arc-shaped top.

[0007] Wastewater flows into a filtration and impurity removal tank through pipes. The filtration device installed inside the tank can effectively intercept large particulate impurities in the wastewater, such as tree branches and plastic pieces, preventing these impurities from entering subsequent treatment units, damaging the equipment, or affecting the treatment effect, thus greatly ensuring the smooth operation of subsequent treatment processes.

[0008] The anaerobic reactor is equipped with a stirring paddle driven by a stirring motor, and a stirring shaft is provided between the stirring motor and the stirring paddle. A hemispherical disperser is located on the stirring shaft.

[0009] The anaerobic reactor is equipped with a liquid guide plate, which is located above the hemispherical disperser. The liquid guide plate is inclined, and the connection between the filtration and impurity removal tank and the anaerobic reactor is located above the liquid guide plate.

[0010] The primary reverse filter is of the "bottom inlet, top outlet" type, with a sewage inlet at the bottom connected to the anaerobic reaction tank and a sewage outlet at the top connected to the anoxic tank. The primary reverse filter is equipped with a filter plate, and the bottom of the primary reverse filter is also equipped with a sludge return port for returning the filtered sludge to the anaerobic reaction tank.

[0011] The primary reverse filter adopts a "bottom-in, top-out" design, with a wastewater inlet at the bottom connecting to the anaerobic reactor and a wastewater outlet at the top connecting to the anoxic reactor. The internal filter plates effectively filter impurities in the wastewater, intercepting larger suspended solids and colloids. Furthermore, a sludge return port at the bottom of the filter returns the sludge generated during filtration to the anaerobic reactor, maintaining the quantity and activity of microorganisms within the reactor and ensuring the stable operation of the anaerobic reaction. This also prevents sludge accumulation within the filter, which would negatively impact filtration efficiency.

[0012] The secondary reverse filter has the same structure as the primary reverse filter.

[0013] The aerobic tank is equipped with an aeration plate, a blower is connected to the aeration plate, and a spray plate is located above the aeration plate.

[0014] The aerobic tank is connected to the coagulant preparation tank via a pipeline, and the coagulant preparation tank is connected to the spray plate via a pipeline.

[0015] Inside the aerobic tank, aeration plates are connected to blowers, which supply air to the aeration plates, providing sufficient oxygen for the aerobic microorganisms to meet their metabolic needs for organic matter oxidation and decomposition, ammonia nitrification, and other processes. A spray tray is located above the aeration plates. The aerobic tank is connected to the coagulant preparation tank via a pipe, and the coagulant preparation tank is then connected to the spray tray via another pipe. When needed, the coagulant in the coagulant preparation tank can be sprayed into the aerobic tank through the spray tray. The coagulant causes suspended particles in the wastewater to coagulate into larger flocs, accelerating sedimentation and improving the sedimentation efficiency of the aerobic tank. It also adsorbs some organic matter and heavy metal ions in the wastewater, assisting in the removal of pollutants and improving effluent quality. Simultaneously, the formed flocs are less likely to clog the filter media in subsequent filtration stages, improving the filtration effect.

[0016] The anoxic pool is equipped with a liquid phase disperser, which is connected to a primary reverse filter.

[0017] The wastewater is evenly dispersed in the anoxic tank by a liquid phase disperser, allowing the wastewater to come into full contact with the anoxic microorganisms. This creates favorable conditions for the denitrification reaction and helps the denitrifying bacteria use the organic matter in the wastewater as a carbon source to reduce nitrate nitrogen to nitrogen gas, thus achieving denitrification treatment of the wastewater.

[0018] The thermal disinfection tank contains internal thermal disinfection coils, which are connected to the aerobic tank coils via connecting pipes. The thermal disinfection tank uses high temperatures to disinfect wastewater, killing pathogens. The waste heat generated during the thermal disinfection process is transferred to the aerobic tank coils through the thermal disinfection tank coils, providing heating for the aerobic tank. In low-temperature winter conditions, this allows the aerobic tank temperature to be maintained within a suitable range for bacterial growth without consuming large amounts of additional energy, ensuring the activity of aerobic bacteria, improving wastewater treatment efficiency, reducing operating costs, and enhancing the system's adaptability and stability in low-temperature environments.

[0019] The working principle of this utility model is as follows:

[0020] Wastewater first flows into a filtration tank through a wastewater inlet pipe. The tank's internal devices intercept large particles such as twigs and plastic pieces, preventing them from entering subsequent processes and ensuring smooth treatment. The pre-filtered wastewater then enters the anaerobic reactor, where a stirring motor drives an agitator, rotating a stirring shaft and a hemispherical disperser on it. Wastewater falls from an inclined guide plate onto the hemispherical disperser and then disperses further into the anaerobic reactor. After anaerobic reaction, the wastewater enters a primary reverse filter with a bottom-in, top-out structure. Internal filter plates intercept suspended solids and colloids. A bottom sludge return port returns sludge to the anaerobic reactor to maintain the number and activity of microorganisms, ensuring stable anaerobic reaction. Wastewater exiting the primary reverse filter enters the anoxic tank, where it is evenly dispersed by a liquid-phase disperser, ensuring sufficient contact between the wastewater and anoxic microorganisms. This facilitates denitrifying bacteria using organic matter as a carbon source to reduce nitrate nitrogen to nitrogen gas, achieving denitrification. Wastewater from the anoxic tank is further filtered by a secondary reverse filter to ensure stable water quality before entering the aerobic tank. Inside the aerobic tank, blowers provide ample oxygen to aerobic microorganisms via aeration plates, meeting their metabolic needs for organic matter oxidation and decomposition, ammonia nitrification, and other processes. When needed, coagulant from the coagulant preparation tank is sprayed into the aerobic tank through pipes and spray plates, causing suspended particles to aggregate into large flocs, accelerating sedimentation, adsorbing organic matter and heavy metal ions, improving water quality, and preventing the flocs from clogging subsequent filter media. Finally, the wastewater treated in the aerobic tank enters the thermal disinfection tank, where high temperatures kill pathogens. The waste heat generated in the thermal disinfection tank is transferred to the aerobic tank coils through connecting pipes to heat the aerobic tank, maintaining a suitable temperature in the aerobic tank at low temperatures, ensuring the activity of aerobic bacteria, reducing energy consumption, and enhancing system adaptability.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] (1) Through the combination of primary reverse filter, secondary reverse filter and coagulant preparation tank; on the one hand, the filter plate intercepts impurities, creating a stable microbial reaction environment for the aerobic tank, avoiding the impact of excessive impurities on microbial activity, and reducing the possibility of abnormal reproduction of filamentous bacteria; on the other hand, the sludge return port sends the filtered sludge back to the anaerobic reaction tank and the anoxic tank, maintaining the sludge balance in each tank, avoiding excessive accumulation of sludge in local areas, reducing the inducing factors of sludge bulking from the source, and at the same time, through the coagulant preparation tank and spray plate, the sedimentation effect is enhanced, ensuring the stability of sludge treatment and improving the quality of effluent.

[0023] (2) Waste heat recovery is achieved through the connection design between the aerobic tank coil and the thermal disinfection tank coil. The waste heat generated by the thermal disinfection tank is transferred to the aerobic tank coil through the thermal disinfection tank coil to heat the aerobic tank. This method can maintain the temperature of the aerobic tank at 15-30℃, which is suitable for bacterial growth, without the need for a large amount of additional energy consumption, ensuring bacterial activity, improving wastewater treatment efficiency, reducing operating costs, and enhancing the system's adaptability and stability in low-temperature environments.

[0024] (3) A hemispherical disperser is installed in the anaerobic reaction tank. The sewage falls from the inclined guide plate onto the hemispherical disperser and then disperses into the anaerobic reaction tank. The sewage can be evenly dispersed. With the stirring paddle driven by the stirring motor, the sewage and anaerobic microorganisms are fully mixed. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the high-efficiency combined system of the wastewater biochemical treatment pond of this utility model;

[0026] In the diagram: 1. Filtration tank; 2. Anaerobic reactor; 3. Primary reverse filter; 4. Anoxic tank; 5. Secondary reverse filter; 6. Aerobic tank; 7. Thermal disinfection tank; 8. Wastewater inlet pipe; 9. Filter screen; 10. Agitator motor; 11. Agitator paddle; 12. Hemispherical disperser; 13. Guide plate; 14. Filter plate; 15. Liquid phase disperser; 16. Coagulant preparation tank; 17. Pipeline to coagulant preparation tank; 18. Spray plate; 19. Aeration plate; 20. Blower; 21. Aerobic tank coil; 22. Thermal disinfection tank coil; 23. Connecting pipe. Detailed Implementation

[0027] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figure 1As shown, the high-efficiency interconnected wastewater biological treatment system includes, in sequence, a filtration and impurity removal tank 1, an anaerobic reactor 2, a primary reverse filter 3, an anoxic tank 4, a secondary reverse filter 5, an aerobic tank 6, and a thermal disinfection tank 7. The filtration and impurity removal tank 1 is equipped with a wastewater inlet pipe 8. The anaerobic reactor 2 contains a hemispherical disperser 12. The aerobic tank 6 contains an aerobic tank coil 21. The thermal disinfection tank 7 contains a thermal disinfection tank coil 22, which is connected to the aerobic tank coil 21 via a connecting pipe 23. The anaerobic reactor 2 is equipped with a stirring paddle 11 driven by a stirring motor 10. A stirring shaft is located between the stirring motor 10 and the stirring paddle 11, and the hemispherical disperser 12 is located on the stirring shaft. The anaerobic reactor 2 is equipped with a liquid guide plate 13, which is located above the hemispherical disperser 12 and is inclined. The connection between the filtration and impurity removal tank 1 and the anaerobic reactor 2 is located above the liquid guide plate 13. The primary reverse filter 3 is a bottom-in, top-out type, with a wastewater inlet at the bottom connected to the anaerobic reactor 2 and a wastewater outlet at the top connected to the anoxic tank 4. The primary reverse filter 3 contains a filter plate 14 and a sludge return port at the bottom for returning filtered sludge to the anaerobic reactor 2. The internal filter plate 14 effectively filters impurities in the wastewater, intercepting larger suspended solids and colloids. Furthermore, the sludge return port at the bottom returns sludge generated during filtration to the anaerobic reactor 2, maintaining the quantity and activity of microorganisms within the reactor, ensuring stable anaerobic reaction, and preventing sludge accumulation within the filter, which would affect filtration efficiency. The secondary reverse filter 5 has the same structure as the primary reverse filter 3. The aerobic tank 6 is equipped with an aeration plate 19, to which a blower 20 is connected. A spray plate 18 is located above the aeration plate 19. The aerobic tank 6 is connected to the coagulant preparation tank 16 via a pipe 17, and the coagulant preparation tank 16 is connected to the spray plate 18 via a pipe. The anoxic tank 4 is equipped with a liquid phase disperser 15, which is connected to the primary reverse filter 3.

[0030] The above-mentioned high-efficiency combined wastewater biological treatment system includes the following steps during operation:

[0031] (1) Wastewater flows from wastewater inlet pipe 8 into filtration tank 1, where large particles of impurities are intercepted by filter screen 9 to prevent them from affecting subsequent treatment. Then it enters anaerobic reaction tank 2, where stirring motor 10 drives stirring paddle 11 and hemispherical disperser 12 to rotate, so that the wastewater is evenly dispersed and the dispersion effect is enhanced after impacting liquid guide plate 13, thus completing the anaerobic reaction; (2) Subsequently, the wastewater enters primary reverse filter 3, is filtered by filter plate 14, and the sludge is returned to anaerobic reaction tank 2. Then it flows into anoxic tank 4, where it is evenly dispersed by liquid phase disperser 15 to complete denitrification. After being filtered by secondary reverse filter 5, it enters aerobic tank 6; (3) In aerobic tank 6, blower 20 aerates through aeration plate 19 to meet the metabolic needs of microorganisms. If necessary, coagulant from coagulant preparation tank 16 enters aerobic tank 6 through coagulant preparation tank pipe 17 and spray plate 18 to assist sedimentation. Finally, the wastewater enters the thermal disinfection tank 7 for disinfection. The thermal disinfection tank coil 22 transfers the residual heat to the aerobic tank coil 21 through the connecting pipe 23 to maintain a suitable temperature in the aerobic tank and reduce energy consumption.

Claims

1. A high-efficiency combined system for sewage biochemical treatment tank, characterized in that, It comprises a filtering and impurity removing tank (1), an anaerobic reaction tank (2), a first reverse filter (3), an anoxic tank (4), a second reverse filter (5), an aerobic tank (6) and a heat sterilization tank (7) connected in sequence; the filtering and impurity removing tank (1) is provided with a sewage inlet pipeline (8), the anaerobic reaction tank (2) is provided with a hemispherical disperser (12), the aerobic tank (6) is provided with an aerobic tank coil pipe (21), the heat sterilization tank (7) is provided with a heat sterilization tank coil pipe (22), and the heat sterilization tank coil pipe (22) is connected with the aerobic tank coil pipe (21) through a communication pipeline (23).

2. The high-efficiency combined system for sewage biochemical treatment tank according to claim 1, characterized in that, The anaerobic reaction tank (2) is internally provided with a stirring paddle (11) driven by a stirring motor (10), and a stirring shaft is arranged between the stirring motor (10) and the stirring paddle (11), and the hemispherical disperser (12) is arranged on the stirring shaft.

3. The high-efficiency combined system of sewage biochemical treatment tanks according to claim 2, characterized in that, The anaerobic reaction tank (2) is internally provided with a liquid guide plate (13) arranged above the hemispherical disperser (12), and the liquid guide plate (13) is arranged in an inclined manner, and the connection between the filtering and impurity removing tank (1) and the anaerobic reaction tank (2) is arranged above the liquid guide plate (13).

4. The high-efficiency combined system for sewage biochemical treatment tank according to claim 1, characterized in that, The first reverse filter (3) is of a "bottom-in top-out" type, and is provided with a sewage inlet at the bottom connected with the anaerobic reaction tank (2) and a sewage outlet at the top connected with the anoxic tank (4); the first reverse filter (3) is internally provided with a filter plate (14), and is further provided with a sludge backflow port at the bottom for returning the filtered sludge to the anaerobic reaction tank (2).

5. The high-efficiency combined system for sewage biochemical treatment tank according to claim 4, characterized in that, The second reverse filter (5) has the same structure as the first reverse filter (3).

6. The system according to claim 1, wherein the system is characterized by, The aerobic tank (6) is internally provided with an aeration plate (19) connected with a blower (20), and is provided with a spraying disc (18) above the aeration plate (19).

7. The system according to claim 6, wherein the system is characterized by, The aerobic tank (6) is connected with a coagulant preparation tank (16) through a coagulant preparation tank pipeline (17), and the coagulant preparation tank (16) is connected with the spraying disc (18) through a pipeline.

8. The system according to claim 1, wherein the system is characterized by, The anoxic tank (4) is internally provided with a liquid phase disperser (15) connected with the first reverse filter (3).

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