High-efficiency denitrification biological reaction device

Abstract

The application discloses a high-efficiency denitrification biological reaction device, which comprises an anoxic module, an anaerobic module and an aerobic precipitation coupling module which are sequentially connected, the anoxic module and the anaerobic module are each provided with a hydraulic baffling component for conveying sludge water, and the sludge water of the aerobic precipitation coupling module is backflowed to the anoxic module via an aerobic tail gas power component; the aerobic precipitation coupling module can be used for separating clarified water, sludge water and tail gas; the biological reaction device is filled with activated sludge, the activated sludge contains denitrifying bacteria, phosphorus accumulating bacteria, nitrifying bacteria and aerobic bacteria, and the activated sludge is located at the bottom of the anoxic module, the anaerobic module and the aerobic precipitation coupling module; and the biological reaction device can efficiently treat sewage and has the characteristics of simple structure, small land occupation and low cost.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a high-efficiency denitrification biological reactor. Background Technology

[0002] The AAO wastewater treatment process, short for Anaerobic-Anoxic-Aerobic Biological Nitrogen and Phosphorus Removal, is one of the most widely used biological treatment technologies in urban wastewater treatment plants and industrial wastewater treatment. The basic principle of the AAO process is to remove organic matter, nitrogen, and phosphorus from wastewater through the alternating operation of three stages: anaerobic, anoxic, and aerobic. In this process, the anaerobic stage mainly utilizes aerobic phosphorus accumulation and anaerobic phosphorus release by polyphosphate-accumulating bacteria, thereby achieving phosphorus removal; the anoxic stage carries out denitrification, converting nitrates into nitrogen gas, achieving nitrogen removal; and the aerobic stage utilizes nitrifying bacteria to convert ammonia nitrogen into nitrates through nitrification.

[0003] The existing AAO process first pre-treats wastewater to remove large floating objects and inorganic particles such as sand. Then, it sequentially undergoes anaerobic, anoxic, and aerobic treatment. The effluent is then transported to a secondary sedimentation tank for sludge-water separation. The qualified supernatant is discharged or recycled, while the settled activated sludge is returned to the anaerobic zone. Sludge with high phosphorus content is discharged for further treatment. The sludge-water mixture in the anaerobic and anoxic zones is entirely provided by multiple agitators. Sludge return from the secondary sedimentation tank and aerobic mixed liquor return rely on return pumps. This process system is complex, requiring a large area, incurring high costs, and exhibiting relatively low wastewater treatment efficiency. Summary of the Invention

[0004] The purpose of this invention is to disclose a high-efficiency denitrification bioreactor for efficient wastewater treatment, which features simple structure, small footprint, and low cost.

[0005] To achieve the above objectives, the present invention discloses a high-efficiency denitrification bioreactor, comprising: an anoxic module, an anaerobic module, and an aerobic sedimentation coupling module connected in sequence. Both the anoxic module and the anaerobic module are equipped with hydraulic baffles for conveying mud and water. The mud and water in the aerobic sedimentation coupling module are returned to the anoxic module via an aerobic tail gas power component. The aerobic sedimentation coupling module can be used to separate clarified water, sludge water and exhaust gas. The bioreactor is filled with activated sludge, which contains denitrifying bacteria, polyphosphate-accumulating bacteria, nitrifying bacteria and aerobic bacteria. The activated sludge is located at the bottom of the anoxic module, anaerobic module and aerobic sedimentation coupling module.

[0006] As an optional implementation, the aerobic sedimentation coupling module includes a first aerobic module, a second aerobic module, a three-phase separator and a sedimentation module. The anoxic module, the anaerobic module, the first aerobic module and the second aerobic module are connected in sequence. The sludge and water from the second aerobic module are returned to the anoxic module via the aerobic exhaust gas power component. The three-phase separator is located above the second aerobic module, and the sedimentation module is located above the three-phase separator. The three-phase separator is used to separate clarified water to the sedimentation module, separate muddy water to the second aerobic module, and separate exhaust gas for discharge.

[0007] As an optional implementation, the bioreactor includes an inner zone and an outer zone, with the outer zone surrounding the periphery of the inner zone. An anoxic module, an anaerobic module, and a first aerobic module are sequentially arranged in the outer zone along the circumference of the inner zone. A second aerobic module, a three-phase separator, and a sedimentation module are sequentially arranged in the inner zone from bottom to top. The first aerobic module in the outer zone is connected to the second aerobic module in the inner zone. The top of the sedimentation module is provided with an effluent weir for discharging clarified water.

[0008] As an alternative implementation, the inner area has a square structure, and the outer area is circular and surrounds the periphery of the inner area.

[0009] As an optional implementation, the sludge input end of the anoxic module is equipped with a pre-anoxic module. The sludge from the aerobic sedimentation coupling module is returned to the pre-anoxic module via the aerobic exhaust gas power component. The pre-anoxic module is located in the outer zone and is located between the first aerobic module and the anoxic module.

[0010] As an optional implementation, an aerobic exhaust gas power assembly is provided between the anaerobic module and the first aerobic module. As an optional implementation, the aerobic sedimentation coupling module is provided with an aeration component, which includes a blower, an aeration pipe and several aerators. The several aerators are distributed at the bottom of the first aerobic module and the second aerobic module, and the several aerators are connected to the blower through the aeration pipe.

[0011] As an optional implementation, the hydraulic baffle assembly includes a first baffle and a second baffle that are alternately arranged circumferentially along the outer zone. The bottom end of the first baffle is fixed to the bottom of the bioreactor, the top end of the first baffle is lower than the sewage surface, the top end of the second baffle is fixed to the top of the bioreactor, and the bottom end of the second baffle is spaced apart from the bottom of the bioreactor.

[0012] As an alternative implementation, the bottom end of the second partition is bent toward the first partition behind it.

[0013] As an optional implementation, the anoxic module is provided with a mixed liquid return flow metering tank, the radial dimension of which is smaller than that of the anoxic module.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The aerobic sedimentation coupling module of the present invention integrates aerobic treatment function as well as mud-water, clarified water and tail gas separation function. It eliminates the need for additional secondary sedimentation tanks and other devices, greatly simplifying the device structure and reducing the overall size of the device, thus occupying a small area and reducing investment costs, operating costs and energy consumption, thereby significantly reducing costs.

[0015] Furthermore, the anoxic module, anaerobic module, and aerobic sedimentation coupling module of this invention are sequentially and cyclically connected. The anoxic and anaerobic modules utilize hydraulic baffles to drive the mixing of the sludge and water. The circulating flow of the sludge and water is achieved through a component that collects aerobic exhaust gas as the power source for airlift, featuring zero energy consumption and high efficiency. Moreover, the anoxic module is positioned before the anaerobic module, which facilitates preferential denitrification. Based on this, the biological reactor of this invention can efficiently remove nitrogen and phosphorus from wastewater, thus enabling efficient wastewater treatment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the high-efficiency denitrification bioreactor of the present invention; Figure 2 This is a system flow diagram of the high-efficiency denitrification bioreactor of the present invention; Figure 3 This is a front sectional view of the high-efficiency denitrification bioreactor of the present invention.

[0018] Explanation of key figure labels: 10. Inner Zone; 20. Outer Zone; 1. Anoxic module; 11. Inlet; 12. Metering tank; 2. Anaerobic module; 3. Aerobic sedimentation coupling module; 31. First aerobic module; 32. Second aerobic module; 33. Three-phase separator; 34. Sedimentation module; 341. Effluent weir; 35. Aeration assembly; 351. Blower; 352. Aeration pipe; 353. Aerator; 4. Hydraulic baffle assembly; 41. First baffle; 42. Second baffle; 5. Aerobic exhaust gas power assembly; 6. Pre-anoxic module; 7. Sludge collection module; 71. Sludge discharge port. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] Please see Figure 1-3As shown in the illustration, this application provides a high-efficiency denitrification bioreactor for treating wastewater. After pretreatment to remove large floating debris and inorganic particles such as sand, the wastewater is transported to the bioreactor for denitrification and phosphorus removal. The bioreactor is filled with activated sludge, which can be obtained through natural acclimatization, inoculation, or other methods. Activated sludge includes various microorganisms, metabolites, organic matter, and inorganic matter, such as denitrifying bacteria, polyphosphate-accumulating bacteria, and nitrifying bacteria, thus possessing wastewater treatment capabilities.

[0026] The bioreactor comprises an anoxic module 1, an anaerobic module 2, and an aerobic sedimentation coupling module 3, connected in sequence. Both anoxic module 1 and anaerobic module 2 are equipped with hydraulic baffles 4 for conveying sludge. The sludge from the aerobic sedimentation coupling module 3 is returned to the anoxic module 1 via an aerobic exhaust gas power component 5. After pretreatment, the wastewater enters the bioreactor and mixes with activated sludge to form sludge. This sludge is agitated and evenly distributed within the anoxic and anaerobic modules 1 and 2 by the reciprocating flow of the hydraulic baffles 4. This ensures high biological activity of the denitrifying bacteria in the anoxic module 1 and the polyphosphate-accumulating bacteria in the anaerobic module 2, and allows the sludge to flow smoothly from the anoxic module 1 to the anaerobic module 2 and then to the aerobic sedimentation coupling module 3 via the thrust of the hydraulic baffles 4. The sludge from the aerobic sedimentation coupling module 3 is returned to the anoxic module 1 via the aerobic exhaust gas power component 5, thus achieving wastewater recycling by circulating microorganisms and various organic matter.

[0027] The hydraulic baffle assembly 4 enables the sludge-water flow to bend and turn, thereby agitating the sludge with water flow, preventing sludge settling, and ensuring high activity and uniform distribution of bacteria within the sludge. Compared to existing flow-pushing mixers, it is lower in cost and requires no electricity, while still achieving the same effect of driving sludge-water flow and mixing. The aerobic tail gas power assembly 5 is an airlift structure that uses the aeration tail gas collected in the aerobic sedimentation coupling module 3 as the airlift power to lift the sludge mixed liquor from the aerobic zone back to the anoxic module 1, providing the power required for the hydraulic baffles in the anoxic module 1 and anaerobic module 2. Compared to existing mixed liquor return pumps, the aerobic tail gas power assembly 5 has the advantages of zero power consumption and high efficiency, enabling the return of wastewater to be completed many times over, thus multiplying the wastewater treatment efficiency. In this embodiment, the anoxic module 1, anaerobic module 2, and aerobic sedimentation coupling module 3 are sequentially and cyclically connected. The anoxic module 1 and anaerobic module 2 utilize a hydraulic baffle assembly 4 to agitate the sludge and water, ensuring uniform distribution of the activated sludge. The sludge and water circulation is achieved through an aerobic tail gas power assembly 5, which features high driving force and low cost. Furthermore, the anoxic module 1 is positioned before the anaerobic module 2, facilitating preferential denitrification. Based on this, the biological reactor can efficiently remove nitrogen and phosphorus from wastewater, resulting in highly efficient wastewater treatment.

[0028] The effective bacteria in the anoxic module 1 are denitrifying bacteria. These bacteria use organic matter in the wastewater as a carbon source for denitrification, gradually reducing nitrate to nitric oxide and nitrous oxide using nitrate as an electron acceptor, ultimately converting it into nitrogen gas. The effective bacteria in the anaerobic module 2 are polyphosphate-accumulating bacteria, which release phosphorus from the wastewater as phosphate into the sludge and can also degrade organic matter in the wastewater. The effective bacteria in the aerobic sedimentation coupling module 3 include aerobic bacteria, nitrifying bacteria, and polyphosphate-accumulating bacteria. Under aerobic conditions, aerobic bacteria decompose organic matter in the wastewater into carbon dioxide and water; polyphosphate-accumulating bacteria absorb soluble phosphate in the wastewater and store it as polyphosphate for removal during sludge discharge; nitrifying bacteria nitrify the wastewater, first oxidizing ammonia nitrogen to nitrite, and then further oxidizing it to nitrate. The sludge and water in the anoxic module 1, anaerobic module 2, and aerobic sedimentation coupling module 3 circulate, enabling the wastewater to be treated in a cyclical manner for nitrogen and phosphorus removal. Furthermore, the anoxic module 1 is located before the anaerobic module 2. The nitrate produced by the nitrification process in the aerobic precipitation coupling module 3 is first denitrified through the anoxic module 1. This allows the anoxic module 1 to preferentially utilize the carbon source to remove nitrate compared to the anaerobic module 2, alleviating carbon source competition and improving the nitrogen and phosphorus removal efficiency of the bioreactor.

[0029] The aerobic sedimentation coupling module 3 separates clarified water, sludge, and exhaust gas. Wastewater, after being treated by the anoxic module 1 and anaerobic module 2, enters the aerobic sedimentation coupling module 3 for aerobic treatment, nitrification, and phosphorus uptake. At the aerobic sedimentation coupling module 3, exhaust gas (including carbon dioxide and nitrogen), sludge, and treated clarified water accumulate. After separating the clarified water, sludge, and exhaust gas, the aerobic sedimentation coupling module 3 directly discharges the exhaust gas and clarified water, while the sludge is recycled for further nitrogen and phosphorus removal. The aerobic sedimentation coupling module 3 integrates aerobic treatment and sludge, clarified water, and exhaust gas separation functions, eliminating the need for additional secondary sedimentation tanks and other equipment. This greatly simplifies the device structure, reduces the overall size of the device, and minimizes the footprint, thereby reducing investment costs, operating costs, and energy consumption, significantly lowering overall costs.

[0030] The aerobic sedimentation coupling module 3 includes a first aerobic module 31, a second aerobic module 32, a three-phase separator 33, and a sedimentation module 34. The anoxic module 1, the anaerobic module 2, the first aerobic module 31, and the second aerobic module 32 are connected in sequence. The sludge and water from the second aerobic module 32 are returned to the anoxic module 1 via the aerobic tail gas power component 5. The three-phase separator 33 is located above the second aerobic module 32, and the sedimentation module 34 is located above the three-phase separator 33. The three-phase separator 33 is used to separate clarified water to the sedimentation module 34, separate sludge and water to the second aerobic module 32, and separate tail gas for discharge.

[0031] After wastewater is transported to the aerobic sedimentation coupling module 3, it undergoes nitrification, aerobic treatment, and phosphorus uptake in the first aerobic module 31 and the second aerobic module 32 to form nitrates, decompose organic matter into carbon dioxide and water, and absorb phosphates. During this process, multiple reactions occur in the first and second aerobic modules 31 and 32. Sludge, muddy water, clarified water, and exhaust gas are all transported from the first aerobic module 31 to the second aerobic module 32 and flow upwards to the three-phase separator 33 under mutual disturbance. The three-phase separator 33 blocks sludge and muddy water, causing them to flow downwards. The sludge settles to the bottom of the second aerobic module 32, while the muddy water is driven back to the anoxic module 1 by the aerobic exhaust gas power component 5. Simultaneously, the three-phase separator 33 allows exhaust gas and clarified water to flow upwards. The exhaust gas can be discharged directly, while the clarified water flows to the sedimentation module 34, where it accumulates to a certain amount before being discharged. The clarified water, after treatment, meets discharge standards and can be directly discharged into rivers, lakes, or seas, or recycled. Thus, the aerobic sedimentation coupling module 3 integrates multiple functions, which not only ensures the efficient treatment of wastewater by the bioreactor, but also makes it small in size and low in cost.

[0032] The aerobic module is divided into a first aerobic module 31 and a second aerobic module 32, which are arranged side by side in the direction of sludge-water flow. The first aerobic module 31 focuses on the wastewater treatment function of the aerobic sedimentation coupling module 3, so as to better perform nitrification, aerobic treatment, and phosphorus uptake treatment on wastewater. The second aerobic module 32 is located below the three-phase separator 33, and works with the three-phase separator 33 to separate sludge, sludge-water, clarified water, and exhaust gas in addition to wastewater treatment. The first aerobic module 31 and the second aerobic module 32 work together to ensure the efficiency of wastewater treatment in the aerobic sedimentation coupling module 3, as well as the functions of separation, discharge, and circulation, making the wastewater treatment function of the biological reactor more complete.

[0033] The first aerobic module 31 and the second aerobic module 32 require an aerobic environment. During the long-term circulating treatment of wastewater, the oxygen in the first aerobic module 31 and the second aerobic module 32 is continuously consumed. Therefore, the aerobic sedimentation coupling module 3 is equipped with an aeration assembly 35, which includes a blower 351, an aeration pipe 352, and several aerators 353. The several aerators 353 are distributed at the bottom of the first aerobic module 31 and the second aerobic module 32, and are connected to the blower 351 via the aeration pipe 352. The blower 351 can be an air pump, which pumps air into the several aerators 353 through the aeration pipe 352, and then pumps the air into the first aerobic module 31 and the second aerobic module 32 through the several aerators 353 to maintain the oxygen content in the first aerobic module 31 and the second aerobic module 32.

[0034] The air flow rate pumped into the aeration component 35 can be determined according to the wastewater treatment requirements. Oxygen concentration detection devices can be installed in the first aerobic module 31 and the second aerobic module 32. The oxygen concentration detection devices are electrically connected to the control system to detect the oxygen concentration of the first aerobic module 31 and the second aerobic module 32 in real time. This allows for timely aeration when the oxygen concentration is insufficient, maintaining the normal wastewater treatment capacity of the first aerobic module 31 and the second aerobic module 32.

[0035] Of course, in practical applications, blower 351 can also be an oxygen pump, which has a higher oxygen content and can quickly increase the oxygen content in the first aerobic module 31 and the second aerobic module 32. However, the cost of an oxygen pump is significantly higher than that of an air pump, and it is easy to cause excessively high oxygen content in the first aerobic module 31 and the second aerobic module 32, affecting the activity of the bacteria. Therefore, the selection of blower 351 depends on the actual wastewater treatment situation and is not specifically limited.

[0036] After being treated by the anoxic module 1, anaerobic module 2, first aerobic module 31 and second aerobic module 32, the wastewater will form a portion of clarified water that meets the discharge standards. The clarified water is separated by the three-phase separator 33 and then collected into the sedimentation module 34. The top of the sedimentation module 34 is equipped with an outlet weir 341 for discharging the clarified water, so that it can be discharged or recycled in a timely manner when there is a large amount of clarified water.

[0037] In addition to the above structure, the bioreactor of this application embodiment includes an inner zone 10 and an outer zone 20. The outer zone 20 surrounds the periphery of the inner zone 10. The anoxic module 1, the anaerobic module 2, and the first aerobic module 31 are sequentially arranged in the outer zone 20 along the circumference of the inner zone 10. The second aerobic module 32, the three-phase separator 33, and the precipitation module 34 are sequentially arranged in the inner zone 10 from bottom to top. The first aerobic module 31 of the outer zone 20 is connected to the second aerobic module 32 of the inner zone 10.

[0038] This bioreactor employs an outer zone 20 surrounding an inner zone 10. Modules primarily used for wastewater treatment, such as the anoxic module 1, anaerobic module 2, and the first aerobic module 31, are arranged end-to-end along the water flow direction, ensuring smooth connection between the reaction modules for efficient wastewater treatment. The treated wastewater enters the inner zone 10, where it undergoes further treatment and separation via the second aerobic module 32. This process in the inner zone 10 achieves the discharge of exhaust gas and clarified water, the settling of sludge, and the return of sludge to the outer zone 20. This circulating bioreactor not only efficiently treats wastewater but also features a rationally arranged layout, resulting in a compact size and low cost. Furthermore, the wastewater treatment modules are mainly located in the outer zone 20, while the separation modules are located in the inner zone 10, minimizing mutual interference between the treatment and separation processes and ensuring efficient operation of both procedures.

[0039] It is worth noting that in this embodiment, the anoxic module 1, anaerobic module 2, and first aerobic module 31 are simply connected in sequence. The number or area of ​​the anoxic module 1, anaerobic module 2, and first aerobic module 31 is not specifically limited, but depends on the wastewater treatment requirements. For example, the anoxic module 1 and first aerobic module 31 can be set in a larger area, while the anaerobic module 2 can be set in a smaller area.

[0040] In one or more embodiments, the inner region 10 has a square structure, and the outer region 20 is circular, surrounding the periphery of the inner region 10. The circular arrangement of the outer region 20 facilitates production and occupies a smaller area. The square arrangement of the inner region 10 facilitates the assembly of the sedimentation module 34 and promotes the sedimentation of muddy water and sludge, allowing clarified water to separate more quickly into the sedimentation module 34.

[0041] The circulating high-efficiency denitrification bioreactor of this application embodiment utilizes the circulating flow of wastewater between the anoxic module 1, the anaerobic module 2, and the aerobic sedimentation coupling module 3 to achieve efficient wastewater treatment. Based on this, the pretreated wastewater can be directly discharged into the anoxic module 1 and / or the anaerobic module 2.

[0042] In this embodiment, the anoxic module 1 is provided with an inlet 11 for inputting wastewater, which is used to connect to a pretreatment device. The pretreated wastewater contains a large amount of organic matter and sufficient carbon source, and it undergoes denitrification treatment first, which is beneficial to improving the denitrification capacity. In addition, the sludge from the second aerobic module 32 is directly returned to the anoxic module 1, which further improves the denitrification capacity.

[0043] Furthermore, the sludge input end of the anoxic module 1 is equipped with a pre-anoxic module 6. The sludge from the aerobic sedimentation coupling module 3 is returned to the pre-anoxic module 6 via the aerobic tail gas power component 5. The pre-anoxic module 6 is located in the outer zone 20, and is situated between the first aerobic module 31 and the anoxic module 1. The sludge returned from the second aerobic module 32 has a high oxygen content. If it directly enters the anoxic module 1, it will affect the denitrification process of the anoxic module 1. In this embodiment, the pre-anoxic module 6 is used to reduce the dissolved oxygen concentration in the sludge before it is discharged into the anoxic module 1, thereby ensuring the denitrification effect and achieving efficient nitrogen removal. The pre-anoxic module 6 is located in the circulation structure of the outer zone 20 and does not affect the separation effect of the inner zone 10, enabling efficient wastewater treatment and separation.

[0044] Based on this, the sludge from the second aerobic module 32 is returned to the pre-anoxic module 6 and the first aerobic module 31 via the aerobic exhaust gas power component 5, and the amount of sludge returned to the first aerobic module 31 does not exceed one-third of the total returned sludge. Since the highly active bacteria in the sludge output from the anaerobic module 2 are polyphosphate-accumulating bacteria, directly transporting this portion of sludge to the first aerobic module 31 would require a period of adaptation to the environment of the first aerobic module 31 before the aerobic and nitrifying bacteria could be activated, severely impacting wastewater treatment efficiency. Therefore, a small amount of sludge returned from the second aerobic module 32 is mixed with the sludge output from the anaerobic module 2 and transported to the first aerobic module 31 to ensure timely activation of the bacteria in the first aerobic module 31, thereby improving wastewater treatment efficiency.

[0045] It should be noted that even without the pre-anoxic module 6, the mud and water from the second aerobic module 32 can be returned to the anoxic module 1 and the first aerobic module 31 via the aerobic exhaust power component 5, which can also ensure the rapid activation of the bacteria in the first aerobic module 31.

[0046] Furthermore, an aerobic exhaust gas power assembly 5 is provided between the anaerobic module 2 and the first aerobic module 31, thereby providing power for the flow of sewage from the anaerobic module 2 to the first aerobic module 31, achieving efficient recycling treatment of sewage.

[0047] See Figure 2 The hydraulic baffle assembly 4 includes a first baffle 41 and a second baffle 42 alternately arranged circumferentially along the outer zone 20. The bottom end of the first baffle 41 is fixed to the bottom of the bioreactor, and the top end of the first baffle 41 is lower than the sewage surface. The top end of the second baffle 42 is fixed to the top of the bioreactor, and the bottom end of the second baffle 42 is spaced apart from the bottom of the bioreactor. The fixed connection between the bottom end of the first baffle 41 and the top end of the second baffle 42 and the bioreactor can be achieved by welding, screwing, or other methods. The arrangement of the first baffle 41 and the second baffle 42 causes the sludge and water to flow up and down in the anoxic module 1 and the anaerobic module 2, so as to slow down the sludge settling speed by utilizing the upward flow of water, and prevent the sludge from settling to the bottom of the bioreactor, thereby ensuring that the bacteria in the sludge can treat the sewage with high activity.

[0048] The spacing between the first partition 41 and the second partition 42, as well as their quantity, are determined according to the size of the anoxic module 1 and the anaerobic module 2, and the wastewater treatment requirements.

[0049] The bottom end of the second partition 42 is bent toward the first partition 41 behind it. The bent structure of the second partition 42 increases the turbulence when the mud and water flow through the bottom end of the second partition 42, which is more conducive to stirring the sludge.

[0050] Two adjacent first baffles 41 are spaced apart to form a flow channel region. At least one flow channel region is provided with a second baffle 42 to divide the flow channel region into a first flow channel and a second flow channel. The first flow channel guides the sewage to flow downwards, and the second flow channel guides the sewage to flow upwards. The bottom of the second baffle 42 has a lower notch, and the first and second flow channels in the same flow channel region are connected through the lower notch so that sewage can flow from the first flow channel to the second flow channel. The width of the second flow channel is greater than the width of the first flow channel so that a suspended activated sludge layer can be formed in the second flow channel during the sewage flow process.

[0051] Specifically, the first baffle 41 extends from the bottom to the top of the device, and the second baffle 42 extends from the top to the bottom of the device. During the sewage flow, the sewage first enters the first flow channel and flows downward within it, then enters the second flow channel through the lower notch and flows upward within it. Setting the width of the second flow channel to be greater than the width of the first flow channel ensures that the sewage velocity in the first flow channel is greater than that in the second flow channel. The sewage in the first flow channel flows downward at a high velocity, and the direction of the water flow velocity is the same as the direction of gravity acting on the activated sludge. Therefore, the sewage will effectively propel the activated sludge forward. The sewage in the second flow channel flows at a low velocity, and the direction of the water flow velocity is opposite to the direction of gravity acting on the activated sludge. Therefore, the effect of gravity on the activated sludge cancels out the effect of the water flow propulsing the activated sludge, thus causing the denser activated sludge to remain suspended in the second flow channel.

[0052] Regardless of whether it's the first or second flow channel, the activated sludge in the wastewater is affected by both the water flow and gravity. In the first flow channel, the direction of gravity on the activated sludge is the same as the direction of the water flow; that is, the direction of gravity is the same as the direction of the water flow. In the second flow channel, the direction of gravity on the activated sludge is opposite to the direction of the water flow. For denser activated sludge, the water flow velocity in the second flow channel is lower, resulting in a smaller effect of the water flow on the activated sludge, thus offsetting the effect of gravity. In other words, the effect of gravity on the activated sludge cancels out the effect of the water flow carrying the activated sludge, causing at least some of the denser activated sludge to remain suspended in the second flow channel. Simply put, the lower-velocity water flow does not carry away the denser activated sludge, thus keeping the denser activated sludge suspended.

[0053] Understandably, the higher-density activated sludge is suspended in the second flow channel, while the wastewater continuously flows forward. Therefore, the wastewater passing through the second flow channel will have ample contact with the suspended activated sludge, ensuring a significant degree of denitrification and phosphorus release, thus achieving efficient nitrogen and phosphorus removal. Consequently, the second flow channel containing the suspended activated sludge functions as a relatively stable and efficient anoxic or anaerobic reaction zone.

[0054] At least one second baffle 42 includes a vertical plate and an inclined plate, the inclined plate being bent and connected to the vertical plate so that the width of the inlet of the second flow channel is smaller than the width of the outlet of the second flow channel. This arrangement allows for a faster flow velocity at the inlet of the second flow channel, thereby agitating the activated sludge near the bottom of the tank near the inlet and preventing excessive accumulation of activated sludge at the bottom of the tank, which would reduce reaction efficiency.

[0055] In some embodiments, in the direction from the inlet to the outlet of the second channel (i.e., from the bottom to the top of the device), the width of the second channel gradually increases at the inclined plate position, meaning the inclined plate is inclined. Due to this inclined arrangement, if the activated sludge in the second channel sinks to the inclined plate, it can slide down the inclined plate to the inlet and then be carried upwards by the high-speed water flow at the inlet, preventing it from sinking to the bottom of the device.

[0056] The top of the first baffle 41 has an upper notch, through which two adjacent flow channel regions are connected. Each flow channel region is provided with a second baffle 42. That is, there are multiple first baffles 41 and multiple second baffles 42, which are arranged alternately. In the same flow channel region, sewage in the first flow channel flows into the second flow channel through the lower notch. In two adjacent flow channel regions, sewage in the second flow channel flows into the first flow channel through the upper notch.

[0057] In addition, the anoxic module 1 is equipped with a metering tank 12, the radial dimension of which is smaller than that of the anoxic module 1. The metering tank 12 is located in the anoxic module 1, and its size is reduced relative to that of the anoxic module 1. This allows the mud and water to flow into the metering tank 12, which utilizes the siphon effect to accelerate the flow and lower the liquid level. This allows the height of the liquid level drop to be measured to calculate the flow rate of the mud and water circulation backflow, facilitating precise control of the mud and water return flow rate by the user.

[0058] The bottom of the anoxic module 1 is equipped with a sludge collection module 7 for collecting sludge, and the bottom of the sludge collection module 7 is equipped with a sludge discharge port 71. The sludge collection module 7 contains settled sludge. After long-term circulation in wastewater treatment, the activity of the bacteria decreases significantly, and the sludge needs to be discharged to replace the activated sludge. The phosphate absorbed in the wastewater treatment can also be discharged together to achieve phosphorus removal.

[0059] The sludge discharge port 71 is equipped with a valve that can be electrically or manually controlled and is opened only when sludge discharge is required.

[0060] In practical applications, the sludge collection module 7 only needs to be placed at the bottom of the biological reactor. For example, it can be placed at the bottom of the anoxic module 1 and / or the anaerobic module 2 and / or the first aerobic module 31 and / or the second aerobic module 32 and / or the pre-anoxic module 6, as long as sludge sedimentation and discharge can be achieved. This application considers that the first aerobic module 31 and the second aerobic module 32 are equipped with aeration components 35, which may disturb the water body and affect the connected anaerobic module 2 and pre-anoxic module 6, resulting in poor sludge sedimentation. Therefore, the sludge collection module 7 is placed in the anoxic module 1, where the impact is less significant, to ensure effective sludge sedimentation.

[0061] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A high-efficiency denitrification bioreactor, characterized in that, include: The anoxic module, anaerobic module, and aerobic sedimentation coupling module are connected in sequence. Both the anoxic module and the anaerobic module are equipped with hydraulic baffles for conveying mud and water. The mud and water in the aerobic sedimentation coupling module are returned to the anoxic module via the aerobic exhaust gas power component. The aerobic sedimentation coupling module can be used to separate clarified water, sludge water and exhaust gas. The bioreactor is filled with activated sludge, which contains denitrifying bacteria, polyphosphate-accumulating bacteria, nitrifying bacteria and aerobic bacteria. The activated sludge is located at the bottom of the anoxic module, the anaerobic module and the aerobic sedimentation coupling module.

2. The high-efficiency denitrification bioreactor according to claim 1, characterized in that: The aerobic sedimentation coupling module includes a first aerobic module, a second aerobic module, a three-phase separator, and a sedimentation module. The anoxic module, the anaerobic module, the first aerobic module, and the second aerobic module are connected in sequence. The sludge and water from the second aerobic module are returned to the anoxic module via the aerobic exhaust gas power component. The three-phase separator is located above the second aerobic module, and the sedimentation module is located above the three-phase separator. The three-phase separator is used to separate clarified water to the sedimentation module, separate muddy water to the second aerobic module, and separate exhaust gas for discharge.

3. The high-efficiency denitrification bioreactor according to claim 2, characterized in that: The bioreactor includes an inner zone and an outer zone, with the outer zone surrounding the periphery of the inner zone. The anoxic module, the anaerobic module, and the first aerobic module are sequentially arranged in the outer zone along the circumference of the inner zone. The second aerobic module, the three-phase separator, and the sedimentation module are sequentially arranged in the inner zone from bottom to top. The first aerobic module in the outer zone is connected to the second aerobic module in the inner zone. The top of the sedimentation module is provided with an outlet weir for discharging clarified water.

4. The high-efficiency denitrification bioreactor according to claim 3, characterized in that: The inner area has a square structure, and the outer area is circular and surrounds the periphery of the inner area.

5. The high-efficiency denitrification bioreactor according to claim 3, characterized in that: The sludge input end of the anoxic module is equipped with a pre-anoxic module. The sludge from the aerobic sedimentation coupling module is returned to the pre-anoxic module via the aerobic exhaust gas power component. The pre-anoxic module is located in the outer zone and is located between the first aerobic module and the anoxic module.

6. The high-efficiency denitrification bioreactor according to claim 3, characterized in that: The aerobic exhaust gas power component is provided between the anaerobic module and the first aerobic module.

7. The high-efficiency denitrification bioreactor according to claim 2, characterized in that: The aerobic sedimentation coupling module is equipped with an aeration component, which includes a blower, an aeration pipe, and several aerators. The several aerators are distributed at the bottom of the first aerobic module and the second aerobic module, and the several aerators are connected to the blower via the aeration pipe.

8. The high-efficiency denitrification bioreactor according to any one of claims 1-7, characterized in that: The hydraulic baffle assembly includes a first baffle and a second baffle that are alternately spaced along the circumference of the outer zone. The bottom end of the first baffle is fixed to the bottom of the bioreactor, and the top end of the first baffle is lower than the sewage surface. The top end of the second baffle is fixed to the top of the bioreactor, and the bottom end of the second baffle is spaced apart from the bottom of the bioreactor.

9. The high-efficiency denitrification bioreactor according to claim 8, characterized in that: The bottom end of the second partition is bent toward the first partition behind it.

10. The high-efficiency denitrification bioreactor according to any one of claims 1-7, characterized in that: The anoxic module is equipped with a mixed liquid return flow metering tank, the radial dimension of which is smaller than the radial dimension of the anoxic module.

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