CN114524516A

CN114524516A - Biochemical reactor and sewage treatment method

Info

Publication number: CN114524516A
Application number: CN202210187138.1A
Authority: CN
Inventors: 宋岱峰
Original assignee: Sichuan Meifute Environment Treatment Co ltd
Current assignee: Sichuan Meifute Environment Treatment Co ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-05-24
Anticipated expiration: 2042-02-28
Also published as: CN114524516B

Abstract

The invention discloses a biochemical reactor and a sewage treatment method, which solve the problem of large occupied area of a sewage treatment plant in the prior art. A biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; wherein, part or all of the anaerobic reaction zone and/or part or all of the anoxic reaction zone are distributed below the aerobic reaction zone. The sewage treatment method adopts the biochemical reactor. In this biochemical reactor, through carrying out the integrated design with anaerobic reaction district, oxygen deficiency reaction zone and aerobic reaction zone on vertical, the vertical space of make full use of when guaranteeing the play water effect, very big reduction area.

Description

Biochemical reactor and sewage treatment method

Technical Field

The invention relates to the technical field of sewage treatment, in particular to the technical field of activated sludge process water treatment technology, and specifically relates to a biochemical reactor and a sewage treatment method.

Background

The water treatment technology by an activated sludge method is a main method for biologically treating wastewater by decomposing and removing organic pollutants in the wastewater by utilizing the biological coagulation, adsorption and oxidation effects of activated sludge. Mature sewage treatment technologies based on the activated sludge process water treatment technology include an A/O process, an A2O process, a multi-stage AO process, an oxidation ditch process, a sequencing batch activated sludge process (SBR), a CASS process, a Membrane Bioreactor (MBR), and a biological sewage treatment processFluidized bed, biological contact oxidation method, aeration biological filter, etc. The sewage treatment processes need to connect a plurality of functional units in series, and the occupied area of a sewage treatment plant is large (the occupied area is generally 0.4-1.6 m)²/(m³D)), long construction period (6 to 18 months); in addition, the main structure of the traditional sewage treatment plant generally adopts a reinforced concrete structure, the material is mainly reinforced concrete and brick-concrete, a large amount of dust and solid waste are inevitably generated during construction, the influence on the surrounding environment is large, and the disassembly (movement) is difficult.

Along with the continuous acceleration of the urbanization process in China, the discharge capacity of domestic sewage is increased rapidly, and along with the continuous improvement of the environmental emission standard, most of the existing sewage plants face the problem of capacity expansion and upgrading, and a part of areas need new sewage treatment plants. However, the land resources in China are increasingly tense, and especially in large and medium-sized cities, enough land is difficult to be used for the capacity expansion and the extension and the new construction of sewage plants.

In order to save floor area, some sewage plants adopt the construction form of an underground sewage treatment plant, but the construction difficulty is high, the construction period is longer, and the investment cost is high; a part of sewage treatment plants adopt integrated design construction, namely, all buildings (including equipment rooms, operation rooms, control rooms, office areas and unloading and storing areas) and the like are integrally designed on the horizontal plane layout and the vertical plane layout, for example, the equipment rooms and the operation rooms are designed in the space above main structures (sewage treatment units, such as an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank), certain occupied land can be reduced, but the occupied land can be reduced to a limited extent due to the requirement on the safety distance of all functional units.

In fact, the most important structures are main structures, and the occupied area of the main structures accounts for 65% -80% of the total building area, so how to carry out integrated optimization design on each structure in a vertical space is the most direct method for effectively reducing the occupied area. At present, some designs vertically overlap an aerobic tank and a sedimentation tank, but the vertical height is limited due to the limitation of conditions such as hydraulic retention time, effective water depth, water pressure, fan air pressure, electromechanical energy consumption and the like, the whole occupied area is reduced in a limited manner on the premise of unchanging the total volume, and the occupied area is still limited at presentUp to 0.2-0.4 m²/(m³·d)。

Disclosure of Invention

In a first aspect, the present invention aims to provide a biochemical reactor to solve the problem of large floor space of a sewage treatment plant in the prior art.

In order to achieve the object of the first aspect, the present invention provides a first biochemical reactor, which has the following technical scheme:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; wherein, part or all of the anaerobic reaction zone and/or part or all of the anoxic reaction zone are distributed below the aerobic reaction zone.

In a biochemical reactor, an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area are integrated vertically, so that the vertical space is fully utilized, and the occupied area is greatly reduced while the water outlet effect is ensured.

In a second aspect, the present invention aims to provide a biochemical reactor to further reduce the floor space of a sewage treatment plant.

In order to achieve the object of the second aspect, the invention provides a second biochemical reactor, which comprises the following technical scheme:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; wherein, part or all of the anaerobic reaction zone and part or all of the anoxic reaction zone are distributed below the aerobic reaction zone and are arranged in the same layer and opposite to each other.

In the second biochemical reactor, by distributing part or all of the anaerobic reaction zone and part or all of the anoxic reaction zone below the aerobic reaction zone in the same layer and opposite arrangement, not only is the integration level further improved, but also the construction period and the building material input cost can be remarkably reduced.

In a third aspect, the present invention is directed to provide a biochemical reactor to improve anaerobic reaction effect while reducing floor space.

In order to achieve the object of the third aspect, the present invention provides a third biochemical reactor, which comprises the following technical solutions:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; wherein, part or all of the anaerobic reaction zone and part or all of the anoxic reaction zone are distributed below the aerobic reaction zone and are separated by a first partition plate which does not pass through the center of the biochemical reactor.

In the third biochemical reactor, because the first baffle plate is obliquely arranged, the turbulent flow effect can be obviously improved when the muddy water mixture collides with the first baffle plate, the sludge sedimentation and the dead angle are reduced, the activated sludge is ensured to be uniformly mixed with the incoming water and fully subjected to anaerobic reaction, and the BOD is ensured₅(biochemical oxygen demand) degradation effect. Therefore, on the basis of saving land occupation, the third biochemical reactor has better sewage treatment effect.

In a fourth aspect, the present invention is directed to a biochemical reactor to facilitate use and maintenance while reducing the footprint.

In order to achieve the object of the fourth aspect, the present invention provides a fourth biochemical reactor, wherein the technical scheme is as follows:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; the anaerobic reaction zone comprises a first cavity and a second cavity, the first cavity is positioned on the side of the aerobic reaction zone, the opening of the first cavity faces upwards, and the second cavity is positioned below the aerobic reaction zone; the oxygen deficiency reaction zone comprises a third cavity and a fourth cavity, the third cavity is positioned on the side of the aerobic reaction zone, the opening of the third cavity faces upwards, and the fourth cavity is positioned below the aerobic reaction zone.

In the fourth biochemical reactor, the open end of the first cavity can be used as an inlet of sewage, the sewage falls into the second cavity from a high position, and the mixing effect and the turbulence effect of the mud-water mixture in the second cavity can be improved; the first cavity can also be used as an access hole and an observation hole of the anaerobic reaction zone; the third cavity can be used as an access hole, an observation hole and a backflow hole of the anoxic reaction zone; therefore, the fourth biochemical reactor is more convenient to use on the basis of saving occupied land.

In a fifth aspect, the present invention is directed to a biochemical reactor to facilitate use and installation while reducing the footprint.

In order to achieve the object of the fifth aspect, the present invention provides a fifth biochemical reactor, and the technical solution is as follows:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; the three-phase separation structure is arranged in the aerobic reaction zone; wherein, part or all of the anaerobic reaction zone and/or part or all of the anoxic reaction zone are distributed below the aerobic reaction zone; a first supporting plate is arranged in the aerobic reaction zone, the left end and the right end of the first supporting plate are connected with the inner wall of the aerobic reaction zone, and the lower end of the first supporting plate is connected with a three-phase separation structure; the aerobic reaction zone comprises a first reaction chamber positioned below the three-phase separation structure and a second reaction chamber positioned on the side of the three-phase separation structure, and the sedimentation zone and the second reaction chamber above the three-phase separation structure are arranged in a separated mode through a first supporting plate.

In the fifth biochemical reactor, the first supporting plate can be used for installing a three-phase separation structure to improve the installation efficiency, and the formed second reaction chamber can also be used as an overhaul access and an observation port of an aerobic reaction zone; by integrating the three-phase separation structure in the aerobic reaction zone, a secondary sedimentation tank can be omitted, and the occupied area is further remarkably reduced. Therefore, on the basis of saving occupied land, the fifth biochemical reactor is more convenient to install and use.

In a sixth aspect, the present invention is directed to provide a biochemical reactor to improve the anoxic reaction and aerobic reaction effects while reducing the floor space.

In order to achieve the above-mentioned object of the sixth aspect, the present invention provides a sixth biochemical reactor, wherein the technical scheme is as follows:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; the three-phase separation structure is arranged in the aerobic reaction zone; the first backflow structure is used for enabling the mud-water mixture at the upper part of the aerobic reaction zone to flow back into the anoxic reaction zone from the aerobic reaction zone; wherein, part or all of the anaerobic reaction zone and/or part or all of the anoxic reaction zone are distributed below the aerobic reaction zone.

In the sixth biochemical reactor, by arranging the first backflow structure, the sewage can be subjected to anoxic reaction and aerobic reaction circularly, and the nitrogen removal effect and the phosphorus removal effect are improved; by integrating the three-phase separation structure in the aerobic reaction zone, a secondary sedimentation tank can be omitted, and the occupied area is further remarkably reduced. Therefore, on the basis of saving occupied land, the sixth biochemical reactor has better sewage treatment effect.

In a seventh aspect, the present invention is directed to provide a biochemical reactor to increase effluent efficiency while reducing floor space.

In order to achieve the seventh aspect of the object, the present invention provides a seventh biochemical reactor, wherein the technical scheme is as follows:

a biochemical reactor, comprising: the biochemical reaction structure comprises an anaerobic reaction area, an anoxic reaction area and an aerobic reaction area; the three-phase separation structure is arranged in the aerobic reaction zone; the drainage structure is arranged above the three-phase separation structure; wherein, part or all of the anaerobic reaction zone and/or part or all of the anoxic reaction zone are distributed below the aerobic reaction zone; the three-phase separation structure comprises a baffle plate assembly, the baffle plate assembly is arranged above the aerobic reaction zone and forms a precipitation zone above the three-phase separation structure, and the baffle plate assembly is provided with a non-vertical flow gap communicated with the aerobic reaction zone and the precipitation zone; the drainage structure comprises an overflow assembly, the overflow assembly is arranged at the upper part of the sedimentation area, the overflow assembly is provided with overflow grooves which are arranged at intervals, and supernatant of the sedimentation area flows into the overflow grooves from overflow ports on the overflow grooves and then is discharged to the outside of the biochemical reactor.

In the seventh biochemical reactor, the three-phase separation structure and the drainage structure are both arranged above the aerobic reaction zone, so that a secondary sedimentation tank is omitted, the occupied area is obviously saved, the effluent purity and the effluent speed are obviously improved, and the treatment efficiency of the post-treatment unit is favorably improved. Therefore, on the basis of saving the occupied land, the seventh biochemical reactor has higher water outlet efficiency.

In an eighth aspect, the present invention is directed to provide a sewage treatment system and a sewage treatment method, so as to solve the problem of large occupied area of a sewage treatment plant in the prior art.

In order to achieve the above-mentioned eighth aspect, the present invention provides a sewage treatment system and a sewage treatment method, wherein the technical scheme is as follows:

a sewage treatment system comprising: the pre-treatment unit is used for receiving sewage, carrying out solid-liquid separation on the sewage and outputting first produced water; the biochemical reaction unit is used for sequentially carrying out anaerobic reaction, anoxic reaction, aerobic reaction and three-phase separation on the sludge-water mixture comprising the first produced water and the activated sludge, and outputting second produced water and the first sludge; the post-treatment unit is used for carrying out solid-liquid separation and disinfection on the second produced water and outputting the standard produced water and second sludge; the sludge concentration unit is used for concentrating the first sludge and the second sludge and outputting clear liquid and sludge cakes, and the clear liquid flows back to the pre-treatment unit or the biochemical reaction unit; wherein the biochemical reaction unit comprises a biochemical reactor, and the biochemical reactor is the biochemical reactor of any one of the first aspect to the seventh aspect.

A method of treating wastewater using the biochemical reactor according to any one of the first to seventh aspects, or using the wastewater treatment system.

Proved by verification, the biochemical reactor, the sewage treatment system and the sewage treatment method greatly reduce the floor area of the structure, and the floor area can be as low as 0.06-0.08 m²/(m³D) and the biochemical reactor can be employedThe modularized production assembly has the advantages of small civil engineering quantity, few matched equipment accessories, only 1800-2500 yuan of water investment per ton and 30-50% reduction of construction cost compared with the traditional sewage treatment facility.

In addition, the biochemical reactor, the sewage treatment system and the sewage treatment method have the following advantages:

(1) the modular design and prefabricated production can be realized, the modules can be directly transported to the site for assembly, the construction is simple, the construction of a sewage plant with more than 10 ten thousand tons can be completed within 30 days, and the construction time is greatly shortened; the influence of site conditions, road transportation conditions and construction conditions is small; can be flexibly assembled and disassembled, and can be moved to different places for reuse, thereby saving resources.

(2) The main body of the splicing structure is made of steel, so that the quantity of foundation civil engineering is small, and the generation of pollution sources such as dust, noise, earthwork, construction waste and the like is greatly reduced; the special steel with the anticorrosive coating is preferably adopted, so that the paint is environment-friendly, nontoxic, low in VOC (volatile organic compounds), tough and wear-resistant, strong in adhesive force, good in physical and mechanical properties, antioxidant, high-temperature resistant, applicable to different environments and capable of prolonging the service life of 30-50 years.

(3) The microorganism in the anaerobic reaction zone can generate a small amount of marsh gas (the main component is methane CH)₄) And part of the odor (e.g. hydrogen sulfide H)₂S, sulfur dioxide SO₂) The gas enters the anoxic reaction zone and the aerobic reaction zone along with the muddy water mixture, the methane can be used as a carbon source of microorganisms to a certain extent, the hydrogen sulfide, the sulfur dioxide and the like can be oxidized and digested under the action of the microorganisms and are converted into substances such as sulfate and the like, and the gas finally released into the atmosphere is odorless and harmless without adding a waste gas collecting and treating system.

(4) The volume of the aerobic reaction zone can be flexibly designed according to the water treatment capacity, the use is flexible and convenient, and the treatment capacity is different from thousands to hundreds of thousands of TPD.

The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:

FIG. 1 is a schematic structural view of a biochemical reaction structure in a first embodiment of a biochemical reactor according to the present invention.

FIG. 2 is a schematic structural diagram of a biochemical reaction structure in a second embodiment of a biochemical reactor according to the present invention.

FIG. 3 is a schematic structural diagram of a biochemical reaction structure in a third embodiment of the biochemical reactor of the present invention.

FIG. 4 is a schematic structural diagram of a biochemical reaction structure in a fourth embodiment of the biochemical reactor of the present invention.

FIG. 5 is a schematic structural view of a biochemical reaction structure in a fifth embodiment of a biochemical reactor according to the present invention.

FIG. 6 is a plan view of a biochemical reaction structure in a fifth embodiment of the biochemical reactor of the present invention.

FIG. 7 is a schematic structural view of a biochemical reactor according to a sixth embodiment of the present invention.

FIG. 8 is a schematic structural view of another embodiment of a baffle plate assembly in a sixth embodiment of a biochemical reactor according to the present invention.

FIG. 9 is a plan view of an overflow assembly in a sixth embodiment of a biochemical reactor according to the present invention.

FIG. 10 is a schematic structural view of a biochemical reactor according to a seventh embodiment of the present invention.

FIG. 11 is a schematic structural view of an eighth embodiment of a biochemical reactor according to the present invention.

FIG. 12 is a top view of a first reflow structure and a second reflow structure of a ninth embodiment of a biochemical reactor according to the invention.

FIG. 13 is a side view of a first reflow structure and a second reflow structure of a ninth embodiment of a biochemical reactor according to the present invention.

FIG. 14 is a side view of a second return mechanism in a ninth embodiment of the biochemical reactor of the present invention.

FIG. 15 is a schematic view showing the structure of an aeration module in the biochemical reactor according to the present invention.

FIG. 16 is a schematic structural view of an embodiment of the sewage treatment system of the present invention.

The relevant references in the above figures are:

110-anaerobic reaction zone, 111-first chamber, 112-second chamber, 113-first plug flow stirrer, 120-anoxic reaction zone, 121-third chamber, 122-fourth chamber, 123-second plug flow stirrer, 124-reflux chamber, 130-aerobic reaction zone, 131-first reaction chamber, 132-second reaction chamber, 140-sedimentation zone, 101-first viewing port, 102-second viewing port, 103-third viewing port, 200-shell, 210-first partition, 220-second partition, 230-third partition, 240-bottom plate, 251-first ring beam, 252-second ring beam, 260-notch, 271-gas supply pipe, 272-aeration plate, 310-first channel, 320-second channel, 330-sludge discharge port, 400-three phase separation structure, 401-first baffle unit, 402-second baffle unit, 403-third baffle unit, 410-flap, 411-first plate, 412-second plate, 421-first plate, 422-second plate, 500-drainage structure, 510-overflow trough, 520-secondary collector pipe, 530-primary collector pipe, 610-first support plate, 620-second support plate, 810-return plate assembly, 811-first return plate, 812-second return plate, 813-third return plate, 820-return pipe, 830-first return pump, 910-second return hole, 920-first horizontal pipe, 930-first riser pipe, 940-second horizontal pipe, 950-second return pump, 710-gas collection pipe, 720-second riser, 730-third horizontal pipe, A01-lift well, A02-first filtering equipment, B01-second filtering equipment, B02-disinfection equipment, C01-first concentration equipment and C02-second concentration equipment.

Detailed Description

The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:

the technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.

Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.

As shown in fig. 1, the biochemical reactor includes a biochemical reaction structure, the biochemical reaction structure includes an anaerobic reaction region 110, an anoxic reaction region 120 and an aerobic reaction region 130, wherein all regions of the anaerobic reaction region 110 and all regions of the anoxic reaction region 120 are distributed below the aerobic reaction region 130, and the anaerobic reaction region 110, the anoxic reaction region 120 and the aerobic reaction region 130 are sequentially arranged from bottom to top.

In the biochemical reactor of the first embodiment, the biochemical reaction structure has a layered structure, which significantly reduces the floor space of the biochemical reactor; the anaerobic reaction zone 110 and the anoxic reaction zone 120 are arranged below the aerobic reaction zone 130, so that the subsequent treatment of aerobic reaction products is more convenient; the anaerobic reaction zone 110, the anoxic reaction zone 120 and the aerobic reaction zone 130 are arranged from bottom to top in sequence, so that the mud-water mixture can flow upwards step by step.

FIG. 2 is a schematic structural diagram of a biochemical reaction structure in a second embodiment of the biochemical reactor of the present invention.

As shown in fig. 2, the biochemical reactor includes a biochemical reaction structure, the biochemical reaction structure includes an anaerobic reaction region 110, an anoxic reaction region 120 and an aerobic reaction region 130, wherein a partial region of the anaerobic reaction region 110 and a partial region of the anoxic reaction region 120 are distributed below the aerobic reaction region 130, and the anaerobic reaction region 110, the anoxic reaction region 120 and the aerobic reaction region 130 are sequentially arranged from bottom to top.

Compared with the first embodiment, the biochemical reactor of the second embodiment has a partial region of the anaerobic reaction region 110 and the anoxic reaction region 120 extending to the outside of the aerobic reaction region 130, and the extended partial region can be used as a service access and a viewing port.

As shown in fig. 3, the biochemical reactor includes a biochemical reaction structure, and the biochemical reaction structure includes an anaerobic reaction region 110, an anoxic reaction region 120, and an aerobic reaction region 130, wherein all regions of the anaerobic reaction region 110 and all regions of the anoxic reaction region 120 are distributed below the aerobic reaction region 130 and are arranged in the same layer and opposite to each other.

Compared with the first embodiment, the biochemical reactor of the third embodiment has more optimized integration level, and can significantly reduce the construction period and the building material input cost; moreover, the anaerobic reaction zone 110 and the anoxic reaction zone 120 are arranged in the same layer, so that the mud-water mixture can be conveniently moved from the anaerobic reaction zone 110 to the anoxic reaction zone 120, and the energy consumption for the flow of the mud-water mixture is reduced.

FIG. 4 is a schematic structural diagram of a biochemical reaction structure in a fourth embodiment of a biochemical reactor according to the present invention.

As shown in fig. 4, the biochemical reactor includes a biochemical reaction structure, and the biochemical reaction structure includes an anaerobic reaction region 110, an anoxic reaction region 120, and an aerobic reaction region 130, wherein a partial region of the anaerobic reaction region 110 and a partial region of the anoxic reaction region 120 are distributed below the aerobic reaction region 130 and are disposed in the same layer and opposite to each other.

Compared with the third embodiment, in the biochemical reactor of the fourth embodiment, partial regions of the anaerobic reaction region 110 and the anoxic reaction region 120 extend to the outside of the aerobic reaction region 130, and the extended partial regions can be used as a service entrance and an observation entrance.

As shown in fig. 5, the biochemical reactor includes a biochemical reaction structure, the biochemical reaction structure includes an anaerobic reaction region 110, an anoxic reaction region 120 and an aerobic reaction region 130, the anaerobic reaction region 110 includes a first cavity 111 and a second cavity 112, the first cavity 111 is located at a side of the aerobic reaction region 130 and has an upward opening, and the second cavity 112 is located below the aerobic reaction region 130; the anoxic reaction zone 120 comprises a third cavity 121 and a fourth cavity 122, the third cavity 121 is located at the side of the aerobic reaction zone 130, and the opening of the third cavity is upward, and the fourth cavity 122 is located below the aerobic reaction zone 130; the second cavity 112 and the fourth cavity 122 are disposed in a same layer and opposite to each other.

Compared with the fourth embodiment, the first cavity 111 and the third cavity 121 of the biochemical reactor of the fifth embodiment extend upwards to be flush with the aerobic reaction zone 130, so that the biochemical reactor is more convenient to manufacture and use; moreover, the sewage falls into the second cavity 112 from a high place (the opening end of the first cavity 111), so that the mixing effect and the turbulence effect of the mud-water mixture in the second cavity 112 can be improved; meanwhile, when the nitrified liquid in the aerobic reaction zone 130 flows back to the fourth cavity 122 from the upper part of the third cavity 121, the anoxic reaction effect in the fourth cavity 122 can be improved by the manner of falling from the high part. Similarly, the open ends of the second and

fourth chambers

112 and 122 can also serve as access ports and observation ports (i.e., the first observation port 101 for observing the anaerobic reaction zone 110 and the second observation port 102 for observing the anoxic reaction zone 120).

In the above five embodiments, the biochemical reactor of the fifth embodiment has the best integration effect and use effect, and therefore, other structures of the biochemical reactor of the fifth embodiment will be further described in detail below. The method comprises the following specific steps:

the volume ratio of the second cavity 112 to the fourth cavity 122 is preferably 1: (2-10) to meet various water inlet quality and water outlet quality requirements; in specific implementation, the volume ratio of the second cavity 112 to the fourth cavity 122 may be, but is not limited to, any one of 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, and 1: 10.

The bottom of the first cavity 111 is provided with a first plug flow stirrer 113 to improve the mixing effect of the mud-water mixture, and the number of the first plug flow stirrers 113 can be one or more; a second impeller 123 is disposed at the bottom of the third cavity 121 to improve the mixing effect of the mud-water mixture, and one or more second impellers 123 may be provided.

As shown in fig. 6, the biochemical reaction structure further includes a housing 200, a second partition 220, and a third partition 230; the anaerobic reaction zone 110, the anoxic reaction zone 120 and the aerobic reaction zone 130 are integrated in the shell 200; the left end and the right end of the second partition plate 220 are connected with the side wall of the shell 200, the lower end of the second partition plate is connected with the bottom plate 240 of the aerobic reaction zone 130, and the first cavity 111 and the aerobic reaction zone 130 are separated by the second partition plate 220; the left and right ends of the third partition plate 230 are connected with the side wall of the housing 200, the lower end is connected with the bottom plate 240 of the aerobic reaction zone 130, and the third cavity 121 and the aerobic reaction zone 130 are separated by the third partition plate 230. Therefore, the anaerobic reaction zone 110, the anoxic reaction zone 120 and the aerobic reaction zone 130 can be formed by welding the housing 200, the second partition plate 220, the third partition plate 230 and the bottom plate 240, and the installation is more convenient.

The housing 200 may have a prismatic shape or a cylindrical shape; preferably, the cylindrical shell 200 is adopted, so that firstly, the opening sizes of the first cavity 111, the third cavity 121 and the aerobic reaction zone 130 are conveniently and flexibly controlled, secondly, a mud-water mixture flows in the cylindrical container and is not easy to generate dead angles, the effective use area in a unit area is larger, thirdly, the cylindrical structure is more convenient to process and assemble, fourthly, when the cylindrical shell is impacted by water flow, the stress is more uniform, and the structural stability is stronger.

The second partition plate 220 and the third partition plate 230 are symmetrically arranged at two sides of the aerobic reaction zone 130, and the second partition plate 220 and the third partition plate 230 are vertically arranged, thereby facilitating quick installation.

Preferably, the second cavity 112 and the fourth cavity 122 are partitioned by the first partition 210 and are disposed opposite to each other, the left and right ends of the first partition 210 are connected to the sidewall of the housing 200, the lower end is connected to the bottom of the housing 200, and the upper end is connected to the bottom plate 240 of the aerobic reaction zone 130, thereby reducing material costs and further simplifying installation.

The projection of the joint of one end of the first partition plate 210 and the shell 200 and the projection of the joint of one end of the second partition plate 220 and the shell 200 coincide, and the included angle 1 between the first partition plate 210 and the second partition plate 220 is 40-50 degrees, at the moment, when the muddy water mixture is in contact collision with the first partition plate 210 which is obliquely arranged under the action of the first plug flow stirrer 113, the turbulent flow effect can be enhanced by resultant force, the sedimentation of activated sludge and the generation of dead angles are reduced, and the uniform mixing of the activated sludge and incoming water is ensured, so that the efficiency of biochemical reaction is ensured; in specific implementation, the included angle ×.1 between the first partition plate 210 and the second partition plate 220 may be, but is not limited to, any one of 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, and 50 °.

The first baffle 210 is preferably a wave-shaped plate, which can further enhance the turbulence effect compared to a straight plate.

The first partition plate 210 is provided with a first channel 310 for the mud-water mixture to flow from the second cavity 112 into the fourth cavity 122, and the first channel 310 is arranged on the first partition plate 210 far away from the second partition plate 220, thereby prolonging the flow path of the mud-water mixture and improving the anaerobic reaction effect. The first passage 310 is preferably a coin-cut, i.e., the first passage 310 has a rectangular cross-sectional shape, so that the slurry and water mixture can form a vortex when passing through the first passage 310, thereby being uniformly distributed in the fourth chamber 122. The first channel 310 is 0.4-0.6 m away from the bottom of the shell 200 and 0.4-0.8 m away from the side wall of the shell 200, so that the flow distribution effect is optimal; in specific implementation, the distance from the bottom of the housing 200 to the first channel 310 may be, but is not limited to, any one of 0.4m, 0.5m, and 0.6m, and the distance from the side wall of the housing 200 to the first channel 310 may be, but is not limited to, any one of 0.4m, 0.5m, 0.6m, 0.7m, and 0.8 m.

The bottom plate 240 and the aeration assembly of the aerobic reaction zone 130 are provided with a second channel 320 for the mud-water mixture to flow into the aerobic reaction zone 130 from the fourth cavity 122, and the second channel 320 is arranged on the bottom plate 240 and the aeration assembly far away from the third cavity 121, so that the flow path of the mud-water mixture is prolonged, and the anoxic reaction effect is improved. The second passage 320 is preferably a slot-type slit, which allows the slurry mixture to swirl while passing through the second passage 320, thereby uniformly distributing the slurry in the aerobic reaction zone 130. The connecting line between the center of the second channel 320 and the side edge of the second clapboard 220 is vertical to the second clapboard 220, and the length of the connecting line is 3.6-4.4 m, so that a beneficial reflection angle can be formed, a muddy water mixture can form turbulent flow conveniently, dead angles are reduced, and the flow distribution effect is improved; in specific implementation, the length of the connecting line may be, but is not limited to, any one of 3.6m, 3.8m, 4m, 4.2m and 4.4 m.

A sludge discharge port 330 for allowing the sludge-water mixture to flow from the aerobic reaction zone 130 to the outside of the shell 200 is arranged on the side wall of the shell 200, preferably, the sludge discharge port 330 is arranged on the side wall of the shell 200 above the anaerobic reaction zone 110, and further preferably, an included angle 2 between a connecting line between the sludge discharge port 330 and the center of the shell 200 and a connecting line between the centers of the second partition plate 220 and the third partition plate 230 is 40-50 degrees, so that the flow path of the sludge-water mixture is prolonged, and the aerobic reaction effect is improved; the angle < 2 > between the line connecting the sludge discharge port 330 and the center of the housing 200 and the line connecting the centers of the second partition plate 220 and the third partition plate 230 may be, but is not limited to, any one of 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 ° and 50 °.

As shown in fig. 7, the biochemical reactor of the sixth embodiment further has a three-phase separation structure 400 and a water discharge structure 500 on the basis of the fifth embodiment; the three-phase separation structure 400 comprises a baffle plate assembly mounted above the aerobic reaction zone 130 and forming a settling zone 140 above the three-phase separation structure 400, the baffle plate assembly having a non-vertical flow gap communicating the aerobic reaction zone 130 and the settling zone 140; the drainage structure 500 includes an overflow assembly installed at an upper portion of the settling zone 140, the overflow assembly having overflow tanks 510 arranged at intervals, and the supernatant of the settling zone 140 flows into the overflow tanks 510 from overflow ports of the overflow tanks 510 and is discharged to the outside of the biochemical reactor.

Therefore, under the action of the aeration assembly, the bubbles bring the sludge-water mixture to slowly rise from the bottom of the aerobic reaction zone 130, when the bubbles contact the three-phase separation structure 400, activated sludge in the sludge-water mixture is reflected when contacting a baffle of the three-phase separation structure 400, and is continuously collided and flocculated, particles are gradually increased, and finally settle to the lower part of the aerobic reaction zone 130 due to self gravity, and water in the sludge-water mixture continuously rises through the flowing gap of the three-phase separation structure 400 until overflowing into the overflow trough 510 and then is discharged, and finally, the three-phase separation of solid, liquid and gas is realized. Therefore, the sewage treatment system with the biochemical reactor can not use a secondary sedimentation tank or a sedimentation tank with larger occupied area, and further obviously reduces the occupied area.

The baffle plate assembly is provided with a first baffle plate unit 401 and a second baffle plate unit 402 which are arranged in a layered mode, the distance d1 between the first baffle plate unit 401 and the second baffle plate unit 402 is 550-700 mm, the first baffle plate unit 401 and the second baffle plate unit 402 are provided with folded plates 410 which are arranged at intervals in a staggered mode, the folded plates 410 are provided with a first plate body 411 and a second plate body 412 which are connected with each other, the openings of the folded plates face downwards, and therefore the three-phase separation effect is good. The included angle between the first plate body 411 and the second plate body 412 is 55-65 degrees, and the width d2 of the first plate body 411 and the second plate body 412 is 600-700 mm, so that the optimal three-phase separation efficiency can be obtained; in specific implementation, the distance d1 may be, but is not limited to, any one of 550mm, 580mm, 600mm, 620mm, 640mm, 660mm, 680mm and 700mm, the included angle between the first plate body 411 and the second plate body 412 may be, but is not limited to, any one of 55 °, 57 °, 59 °, 60 °, 63 ° and 65 °, and the width d2 may be, but is not limited to, any one of 600mm, 620mm, 640mm, 660mm, 680mm and 700 mm.

As shown in fig. 8, the baffle assembly further comprises a third baffle unit 403 arranged between the first baffle unit 401 and the second baffle unit 402, in addition to the first baffle unit 401 and the second baffle unit 402, the third baffle unit 403 has a first plate 421 and a second plate 422 arranged at intervals, the width d3 of the first plate 421 and the first plate 411 is 600-700 mm, the first plate 421 is arranged in parallel with the first plate 411, the second plate 422 is arranged in parallel with the second plate 412, and the distance d4 between the upper ends of the first plate 421 and the second plate 422 is 200-300 mm; therefore, the three-phase separation effect is further improved; in specific implementation, the width d3 may be, but is not limited to, any one of 600mm, 620mm, 640mm, 660mm, 680mm and 700mm, and the distance d4 may be, but is not limited to, any one of 200mm, 220mm, 240mm, 260mm, 280mm and 300 mm.

The width d5 of the gap between the first plate 411 and the first plate 421 and the gap between the second plate 412 and the second plate 422 is 50-100 mm, and the width d6 of the gap between the first plate 421 and the second plate 412 and the gap between the second plate 422 and the first plate 411 is 50-100 mm, so that the three-phase separation effect is optimal; in specific implementation, the width d5 and the width d6 may be, but are not limited to, any one of 50mm, 60mm, 70mm, 80mm, 90mm, and 100 mm.

As shown in fig. 9, the overflow assembly further includes spaced apart secondary water collecting pipes 520, the secondary water collecting pipes 520 being perpendicular to the overflow tank 510 and communicating with the overflow tank 510, and the overflow assembly further includes primary water collecting pipes 530, ends of the spaced apart secondary water collecting pipes 520 being connected to the primary water collecting pipes 530. Therefore, uniform treatment of the effluent is facilitated.

Preferably, the distance between the sludge discharge port 330 and the bottom of the three-phase separation structure 400 is more than or equal to 0.5m, thereby reducing the outflow of the nitrified liquid; the interval between the sludge discharge port 330 and the bottom of the three-phase separation structure 400 is preferably 1 m.

As shown in fig. 10, in addition to the sixth embodiment, the biochemical reactor of the seventh embodiment further includes a first support plate 610, the left and right ends of the first support plate 610 are connected to the inner wall of the aerobic reaction zone 130, the lower end is connected to the three-phase separation structure 400, the aerobic reaction zone 130 includes a first reaction chamber 131 located below the three-phase separation structure 400 and a second reaction chamber 132 located at the side of the three-phase separation structure 400, and the sedimentation zone 140 and the second reaction chamber 132 above the three-phase separation structure 400 are separated by the first support plate 610.

Thus, the first support plate 610 can be used to install the three-phase separation structure 400, thereby improving the installation efficiency, and the second reaction chamber 132 can also be used as a service entrance and an observation opening of the aerobic reaction zone 130 (i.e., the third observation opening 103 for observing the aerobic reaction zone 130).

As shown in fig. 11, in addition to the seventh embodiment, the biochemical reactor of the eighth embodiment further includes a second supporting plate 620, the left and right ends of the second supporting plate 620 are connected to the sidewall of the housing 200, the lower end of the second supporting plate 620 is connected to the three-phase separation structure 400, the first supporting plate 610 and the second supporting plate 620 are parallel, the first supporting plate 610 and the second supporting plate 620 are symmetrically disposed at the two sides of the aerobic reaction zone 130, the first supporting plate 610 and the second supporting plate 620 are vertically disposed, and the three-phase separation structure 400 and the drainage structure 500 are installed in the installation cavity defined by the housing 200, the second partition plate 220, the third partition plate 230, the first supporting plate 610 and the second supporting plate 620.

Thereby, the manufacturing and installation of the three-phase separation structure 400 and the drainage structure 500 are facilitated. Similarly, the second reaction chamber 132 (or the third observation port 103) may also be formed between the second support plates 620.

In order to further simplify the installation of the three-phase separation structure 400 and the drainage structure 500, a first ring beam 251 adapted to the three-phase separation structure 400 and a second ring beam 252 adapted to the drainage structure 500 are arranged in the installation cavity, the first ring beam 251 is welded or bolted to the three-phase separation structure 400, the second ring beam 252 is welded or bolted to the drainage structure 500, and a line connecting centers of the second partition plate 220 and the third partition plate 230 is perpendicular to a line connecting centers of the first support plate 610 and the second support plate 620.

FIG. 12 is a top view of a first reflow structure and a second reflow structure of a ninth embodiment of a biochemical reactor according to the invention. FIG. 13 is a side view of a first reflow structure and a second reflow structure of a ninth embodiment of a biochemical reactor according to the present invention. FIG. 14 is a side view of a second return mechanism in a ninth embodiment of the biochemical reactor of the present invention.

As shown in fig. 12 to 14, in the biochemical reactor of the ninth embodiment, on the basis of the eighth embodiment, the biochemical reactor further has a first return structure for returning the muddy water mixture from the aerobic reaction zone 130 to the anoxic reaction zone 120 and a second return structure for returning the muddy water mixture from the anoxic reaction zone 120 to the anaerobic reaction zone 110; the first backflow structure comprises a first backflow mechanism and a second backflow mechanism.

The first backflow mechanism is used for enabling the muddy water mixture on the upper part of the second reaction chamber 132 to flow back into the anoxic reaction zone 120 from the second reaction chamber 132; thus, since the amount of activated sludge in the second reaction chamber 132 is significantly less than that in the first reaction chamber 131, it is possible to make the nitrifying liquid (i.e., the mixture of sludge and water having a small sludge content) as large as possible, the nitrifying liquid containing nitrate Nitrogen (NO)₃-N) and nitrous Nitrogen (NO)₂-N)) is refluxed to the anoxic reaction zone 120.

The anoxic reaction zone 120 further comprises a reflux cavity 124, and the reflux cavity 124 is located at the side of the second reaction cavity 132; the first backflow mechanism is used for enabling the muddy water mixture to flow back into the backflow cavity 124 from the second reaction cavity 132; specifically, the bottom plate 240 and the aeration assembly of the aerobic reaction zone 130 are provided with notches 260, the first backflow mechanism is provided with a backflow plate assembly 810, the bottom of the backflow plate assembly 810 is connected with the notches 260 to form a backflow cavity 124 communicated with the fourth cavity 122 through the notches 260, the backflow cavity 124 and the second reaction cavity 132 are arranged at intervals through the backflow plate assembly 810, and the backflow plate assembly 810 is provided with a first backflow hole for allowing the mud-water mixture to flow back into the backflow cavity 124 from the second reaction cavity 132, a backflow pipe 820 adapted to the first backflow hole, and a first backflow pump 830; therefore, the backflow is realized, and the processing and the manufacturing are convenient.

The notch 260 is a rectangle, the backflow plate assembly 810 comprises a first backflow plate 811, a second backflow plate 812 and a third backflow plate 813 which are connected end to end, and the first backflow hole is formed in the upper portion of the first backflow plate 811 or the upper portion of the third backflow plate 813, so that the quick installation is facilitated. In order to reduce dead angles, the second reflow plate 812 and the first support plate 610 are preferably placed in close contact with each other.

The widths of the first reflow plate 811, the second reflow plate 812 and the third reflow plate 813 are 1.5-2 m, so that the first reflow mechanism is convenient to install and overhaul.

The second backflow mechanism comprises a gas collecting pipeline 710, a second ascending pipe 720 and a third horizontal pipe 730, the gas collecting pipeline 710 is connected with the baffle plate assembly and communicated with the aerobic reaction zone 130, the outlet of the third horizontal pipe 730 is positioned above the third cavity 121, and the mud-water mixture (mainly nitrification liquid) flowing out of the gas collecting pipeline 710 flows into the anoxic reaction zone 120 from the upper part of the third cavity 121. Therefore, when the air bubbles of the aeration assembly touch the plate body of the baffle plate assembly, the air bubbles are folded to the periphery of the plate body, then pass through the water layer, enter the gas collecting pipeline 710 and are discharged, and due to the discharge of the gas, a local negative pressure is formed in the aerobic reaction zone 130, so that a gas stripping effect is generated, and a part of the mud-water mixture in the aerobic reaction zone 130 flows out through the gas collecting pipeline 710 under the gas stripping effect, and then flows back to the third cavity 121 of the anoxic reaction zone 120 through the second ascending pipe 720 and the third horizontal pipe 730. The third horizontal pipe 730 is 0.5-1 m higher than the overflow trough 510, so that the mud-water mixture can stably flow back.

The second backflow structure includes a second backflow hole 910 formed at the first partition 210, and the second backflow hole 910 is preferably formed at the first partition 210 adjacent to the second partition 220, thereby facilitating the backflow of the sludge-water mixture to sufficiently perform an anaerobic reaction. Moreover, the second backflow structure further comprises a first horizontal pipe 920, a first ascending pipe 930, a second horizontal pipe 940 and a second backflow pump 950 which are sequentially connected to the second backflow hole 910, and an inlet of the second horizontal pipe 940 (i.e. the second backflow pump 950) is located at a lower portion of the backflow cavity 124, so that a portion of the muddy water mixture from the anoxic reaction region 120 above the second horizontal pipe 940 can flow back to the anaerobic reaction region 110, which is helpful for improving the biochemical reaction effect.

The second backflow hole 910 is 0.8-1.2 m away from the bottom of the shell 200 and 1.8-2.2 m away from the side wall of the shell 200, so that the backflow mud-water mixture is uniformly distributed in the anaerobic reaction zone 110; in specific implementation, the distance from the second backflow hole 910 to the bottom of the housing 200 may be, but is not limited to, any one of 0.8m, 0.9m, 1m, 1.1m, and 1.2m, and the distance from the second backflow hole 910 to the sidewall of the housing 200 may be, but is not limited to, any one of 1.8m, 1.9m, 2m, 2.1m, and 2.2 m.

In the biochemical reactors of the above nine embodiments:

the bottom plate 240 of the aerobic reaction zone 130 is provided with aeration assemblies, the aeration assemblies are mounted on the bottom plate 240 of the aerobic reaction zone 130 through brackets, as shown in fig. 15, each aeration assembly comprises an air supply pipe 271 arranged on the brackets and an aeration disc 272 communicated with the air supply pipe 271, the air supply pipes 271 are arranged at intervals in the horizontal and vertical directions, and the arrangement interval is 0.5-0.7 m. The distance between the support and the bottom plate 240 is 0.2-0.3 m, so that the dead angle of activated sludge deposition between the aeration assembly and the bottom plate 240 is reduced, and bubbles can be fully contacted with the muddy water mixture.

In order to ensure the phosphorus removal effect, a chemical phosphorus removal agent adding device can be arranged, so that when the biochemical phosphorus removal effect is poor, the chemical phosphorus removal agent is added into the aerobic reaction zone 130 for removal, and finally most of phosphorus is removed along with the discharge of the residual sludge.

The aerobic reaction zone 130 is enclosed by the second partition plate 220, the third partition plate 230 and the housing 200 (i.e. four corners are tangent circles), the sedimentation zone 140 is enclosed by the second partition plate 220, the third partition plate 230, the first support plate 610, the second support plate 620 and the housing 200, if the volumes of the aerobic reaction zone 130 and the sedimentation zone 140 need to be increased (such as a scene with a large water treatment capacity), besides the depth, the width of the partition plates can be reduced; when the width of the partition plate is reduced, in order to facilitate the installation of the three-phase separation structure 400 and the drainage structure 500, the number of the partition plates and/or the support plates may be increased (i.e., the partition plates may be designed as a hexagonal circle, an octagonal circle, a dodecagonal circle, etc.) as appropriate.

The housing 200 is provided with a corridor and a fence at the top thereof, and the housing is provided with a staircase and a fence on the outer wall thereof to the corridor, thereby facilitating use, observation and maintenance.

As shown in fig. 16, the sewage treatment system includes a pre-treatment unit, a biochemical reaction unit, a post-treatment unit and a sludge concentration unit, wherein the biochemical reaction unit includes one or more biochemical reactors, and the biochemical reactor is any one of the biochemical reactors of the first to ninth embodiments, and preferably the biochemical reactor of the ninth embodiment.

The pre-treatment unit is used for receiving sewage, carrying out solid-liquid separation on the sewage and outputting first produced water; specifically, the pre-processing unit includes a lift well a01 and a first filter apparatus a 02; the lift well A01 is used for receiving and storing sewage, preferably sewage from a municipal sewage network; the first filtering device A02 is used for filtering the sewage and outputting first produced water, and the first filtering device A02 is preferably a grating component, and the grating component is preferably a coarse grating and a fine grating which are arranged in sequence. The sludge-water mixture comprising the first produced water and the activated sludge is subjected to anaerobic reaction, anoxic reaction, aerobic reaction and three-phase separation in turn in a biochemical reaction unit to obtain second produced water and first sludge.

The post-treatment unit is used for performing solid-liquid separation and disinfection on the second produced water and outputting the standard produced water and second sludge; in particular, the post-treatment unit comprises a second filtering device B01 and a disinfection device B02; the second filtering device B01 is used for filtering the second produced water and outputting third produced water and second sludge, and the second filtering device B01 is preferably a fiber rotary disc filter; the disinfection equipment B02 is used for disinfecting the third produced water and outputting the produced water reaching the standard, and the disinfection equipment B02 is preferably an ultraviolet disinfection channel. Through verification, the standard-reaching produced water can reach a primary A standard in a pollutant discharge standard of a municipal wastewater treatment plant GB18918-2002 and an IV standard in a surface water environment quality standard GB3838-2002, and can be directly discharged.

The sludge concentration unit is used for concentrating the first sludge and the second sludge and outputting clear liquid and sludge cakes, and the clear liquid flows back to the pre-treatment unit or the biochemical reaction unit; specifically, the sludge concentration unit comprises a first concentration apparatus C01 and a second concentration apparatus C02; the first concentration device C01 is used for naturally settling the first sludge and the second sludge, outputting supernatant and settled sludge, and the supernatant flows back to the pre-treatment unit or the biochemical reaction unit, and the first concentration device C01 is preferably a sludge concentration tank; the second concentration device C02 is used for dewatering the settled sludge, outputting filtrate and mud cakes, and the filtrate flows back to the pre-treatment unit or the biochemical reaction unit, and the second concentration device C02 is preferably a sludge dewatering machine.

An embodiment of the wastewater treatment method according to the present invention is a method using any one of the biochemical reactors of the first to ninth embodiments, or the wastewater treatment system described above.

The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.

Claims

1. The biochemical reactor is characterized in that: the method comprises the following steps:

a biochemical reaction structure comprising an anaerobic reaction zone (110), an anoxic reaction zone (120) and an aerobic reaction zone (130);

wherein part or all of the area of the anaerobic reaction zone (110) and/or part or all of the area of the anoxic reaction zone (120) are distributed below the aerobic reaction zone (130).

2. The biochemical reactor according to claim 1, wherein: part or all of the anaerobic reaction zone (110) and part or all of the anoxic reaction zone (120) are distributed below the aerobic reaction zone (130) and arranged in the same layer.

3. The biochemical reactor according to claim 2, wherein: the anaerobic reaction zone (110) comprises a first cavity (111) and a second cavity (112), the first cavity (111) is positioned on the side of the aerobic reaction zone (130), the second cavity (112) is positioned below the aerobic reaction zone (130), and preferably a first plug-flow stirrer (113) is arranged in the first cavity (111); and/or the anoxic reaction zone (120) comprises a third cavity (121) and a fourth cavity (122), the third cavity (121) is positioned on the side of the aerobic reaction zone (130), the fourth cavity (122) is positioned below the aerobic reaction zone (130), and preferably a second plug flow stirrer (123) is arranged in the third cavity (121); the volume ratio of the second cavity (112) to the fourth cavity (122) is preferably 1: (2-10).

4. The biochemical reactor according to claim 3, wherein: the biochemical reaction structure further comprises:

a housing (200), the anaerobic reaction zone (110), the anoxic reaction zone (120), and the aerobic reaction zone (130) being integrated within the housing (200); the housing (200) is preferably cylindrical;

the left end and the right end of the first partition plate (210) are connected with the side wall of the shell (200), the lower end of the first partition plate (210) is connected with the bottom of the shell (200), the upper end of the first partition plate is connected with a bottom plate (240) of the aerobic reaction zone (130), and the second cavity (112) and the fourth cavity (122) are arranged in a separated mode through the first partition plate (210);

the left end and the right end of the second partition plate (220) are connected with the side wall of the shell (200), the lower end of the second partition plate (220) is connected with a bottom plate (240) of the aerobic reaction zone (130), and the first cavity (111) and the aerobic reaction zone (130) are arranged in a separated mode through the second partition plate (220);

the left end and the right end of the third partition plate (230) are connected with the side wall of the shell (200), the lower end of the third partition plate (230) is connected with a bottom plate (240) of the aerobic reaction zone (130), and the third cavity (121) and the aerobic reaction zone (130) are arranged in a separated mode through the third partition plate (230); the second partition plate (220) and the third partition plate (230) are preferably symmetrically arranged at both sides of the aerobic reaction zone (130).

5. The biochemical reactor according to claim 4, wherein: the first clapboard (210) is provided with a first channel (310) for the mud-water mixture to flow into the fourth cavity (122) from the second cavity (112), and the first channel (310) is preferably arranged on the first clapboard (210) far away from the second clapboard (220); and/or a second channel (320) for the mud-water mixture to flow from the fourth cavity (122) into the aerobic reaction zone (130) is arranged on the bottom plate (240) of the aerobic reaction zone (130) and the aeration assembly, and the second channel (320) is preferably arranged on the bottom plate (240) and the aeration assembly which are far away from the third cavity (121); the first channel (310) and/or the second channel (320) are preferably coin-slots.

6. The biochemical reactor according to claim 4, wherein: the biochemical reactor further comprises:

a first recirculation arrangement for recirculating the slurry mixture from the aerobic reaction zone (130) to the anoxic reaction zone (120);

a second recirculation structure for recirculating the sludge-water mixture from the anoxic reaction zone (120) into the anaerobic reaction zone (110).

7. The biochemical reactor according to claim 6, wherein: the second reflow structure includes a second reflow hole (910) formed in the first partition (210), and the second reflow hole (910) is preferably formed in the first partition (210) adjacent to the second partition (220).

8. The biochemical reactor according to claim 4, wherein: the side wall of the shell (200) is provided with a sludge discharge port (330) for allowing the sludge-water mixture to flow from the aerobic reaction zone (130) to the outside of the shell (200), preferably, the sludge discharge port (330) is arranged on the side wall of the shell (200) above the anaerobic reaction zone (110), and further preferably, the connecting line of the sludge discharge port (330) and the center of the shell (200) and the connecting line of the centers of the second partition plate (220) and the third partition plate (230) form an included angle of 40-50 degrees.

9. The biochemical reactor according to claim 1, wherein: the biochemical reactor further comprises:

a three-phase separation structure (400), the three-phase separation structure (400) comprising a baffle assembly mounted above the aerobic reaction zone (130) and forming a settling zone (140) above the three-phase separation structure (400), the baffle assembly having a non-vertical flow gap communicating the aerobic reaction zone (130) and the settling zone (140);

the drainage structure (500) comprises an overflow assembly, the overflow assembly is arranged at the upper part of the sedimentation area (140), the overflow assembly is provided with overflow chutes (510) which are arranged at intervals, and supernatant of the sedimentation area (140) flows into the overflow chutes (510) from overflow ports on the overflow chutes (510) and then is discharged to the outside of the biochemical reactor.

10. The sewage treatment method is characterized in that: use of a biochemical reactor according to any of claims 1-9.