Biological reaction tank

Abstract

The utility model discloses a biological reaction tank. The biological reaction tank comprises a plurality of reaction zones, the plurality of reaction zones are sequentially communicated, a plurality of reaction zones are provided with water inlets so as to form a plurality of water inlet reaction zones, at least one reaction zone is arranged between every two adjacent water inlet reaction zones, and the water inlet reaction zones are communicated with the water inlets. At least one reaction zone is arranged between the last water inlet reaction zone and the last reaction zone, the reaction zone forming the first anoxic zone at the downstream of each water inlet is provided with a sewage reflux inlet, and the reaction zone forming the first aerobic zone at the downstream of each water inlet is provided with a sludge reflux inlet; and the membrane tank is communicated with the last reaction area. The biological reaction tank disclosed by the utility model can be used for effectively adjusting the treatment scale, coping with the impact of different water inflows, avoiding sludge aging, effectively reducing the dosage of medicaments and greatly reducing the operation cost, and has the advantages of easiness in operation and the like.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, and specifically, to a biological reaction tank. Background Art

[0002] With the implementation of the "Outdoor Drainage Design Standard" (GB50014-2021), the value of the influent variation coefficient of sewage treatment plants has been further increased, and the tank volume of each process unit and the residence time have been increased during the design stage. China is currently in a stage of rapid urbanization, and the sewage treatment in counties, townships, villages and towns has become a new trend in the construction of sewage treatment plant projects. However, due to insufficient pipeline network construction, untimely pipeline network operation and maintenance, and insufficient preliminary design and research work, there is always a phenomenon of insufficient influent volume in most rural sewage treatment plants in the early stage of operation. The actual influent volume is often less than 50% of the designed influent volume, resulting in problems such as too long residence time of sewage in the biological tank, serious sludge aging, fluctuating effluent quality, and great operation and maintenance difficulty during the operation process. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this purpose, the utility model provides a biological reaction tank.

[0004] The biological reaction tank of the utility model includes: a plurality of reaction zones, the plurality of reaction zones are connected in sequence, and a plurality of the plurality of reaction zones have water inlets to form a plurality of influent reaction zones. There is at least one of the reaction zones between two adjacent influent reaction zones, and there is at least one of the reaction zones between the last influent reaction zone and the last reaction zone. The reaction zone constituting the first anoxic zone downstream of each water inlet has a sewage reflux port, and the reaction zone constituting the first aerobic zone downstream of each water inlet has a sludge reflux port; and a membrane tank, the membrane tank is connected to the last reaction zone.

[0005] The biological reaction tank of the utility model can effectively adjust the treatment scale, cope with the impact of different influent volumes, avoid sludge aging, ensure stable effluent quality, effectively reduce the dosage of chemicals, greatly reduce the operation cost, and has the advantages of easy operation and easy operation and maintenance.

[0006] Optionally, there are at least two of the reaction zones between two adjacent influent reaction zones.

[0007] Optionally, the first of the plurality of reaction zones has a first water inlet, the Mth of the plurality of reaction zones has a second water inlet, the Nth of the plurality of reaction zones has a third water inlet, and the Mth reaction zone is located between the first reaction zone and the Nth reaction zone.

[0008] Optionally, there are 10 reaction zones, the fifth reaction zone has the second water inlet, and the eighth reaction zone has the third water inlet.

[0009] Optionally, when the water inflow of the biological reaction tank is less than or equal to a first preset value, the third water inlet is opened and each of the first water inlet and the second water inlet is closed. The eighth reaction zone forms an anoxic tank, the eighth reaction zone has the sewage return port, the ninth reaction zone forms an aerobic tank, the ninth reaction zone has the sludge return port, and the tenth reaction zone forms an anoxic tank;

[0010] When the water inflow of the biological reaction tank is greater than the first preset value and less than or equal to a second preset value, the second water inlet is opened and each of the first water inlet and the third water inlet is closed. The fifth reaction zone forms an anaerobic tank, the sixth reaction zone, the eighth reaction zone and the tenth reaction zone form anoxic tanks, and the seventh reaction zone and the ninth reaction zone form aerobic tanks, wherein the sixth reaction zone has the sewage return port and the seventh reaction zone has the sludge return port;

[0011] When the water inflow of the biological reaction tank is greater than the second preset value and less than or equal to a third preset value, the first water inlet is opened and each of the second water inlet and the third water inlet is closed. The first reaction zone forms a pre-anoxic tank, the second reaction zone forms an anaerobic tank, the third reaction zone, the fourth reaction zone, the seventh reaction zone and the tenth reaction zone form anoxic tanks, and the fifth reaction zone, the sixth reaction zone, the eighth reaction zone and the ninth reaction zone form aerobic tanks, wherein the third reaction zone has the sewage return port and the fifth reaction zone has the sludge return port.

[0012] Optionally, each reaction zone has the water inlet, the sewage return port, the sludge return port and a liftable aerator.

[0013] Optionally, the biological reaction tank further includes: a sludge return channel, which is communicated with each of the membrane tank and the sludge return port; a radiator, which is arranged in the sludge return channel; and a hot water supply pipe and a hot water return pipe, the hot water supply pipe is connected to the water inlet of the radiator, and the hot water return pipe is connected to the water return port of the radiator.

[0014] Optionally, the biological reaction tank further includes a first heat medium energy meter and a second heat medium energy meter, the first heat medium energy meter is arranged on the hot water supply pipe, and the second heat medium energy meter is arranged on the hot water return pipe.

[0015] Optionally, there are a plurality of the radiators, and the plurality of radiators are arranged at intervals along the length direction and the width direction of the sludge return channel.

[0016] Optionally, two adjacent reaction zones are separated by a partition wall, a water passing opening is provided at the bottom of the partition wall, and the biological reaction tank further includes a lifting gate, and the lifting gate cooperates with the water passing opening to open and close the water passing opening. Description of the Drawings

[0017] Figure 1 is a schematic structural view of a biological reaction tank according to an embodiment of the present invention.

[0018] Figure 2 is a schematic partial structural view of a biological reaction tank according to an embodiment of the present invention.

[0019] Figure 3 is a schematic view of a biological reaction tank according to an embodiment of the present invention.

[0020] Figure 4 is a schematic view of a biological reaction tank according to an embodiment of the present invention.

[0021] Figure 5 is a schematic view of a biological reaction tank according to an embodiment of the present invention. Detailed Embodiment

[0022] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0023] The biological reaction tank 100 according to an embodiment of the present invention will be described below with reference to the drawings. As Figures 1-5 shown, the biological reaction tank 100 according to an embodiment of the present invention includes a membrane tank 2 and a plurality of reaction zones 1.

[0024] The plurality of reaction zones 1 are connected in sequence, and the membrane tank 2 is connected to the last reaction zone 1. A plurality of the plurality of reaction zones 1 have water inlets 11 to form a plurality of inlet reaction zones 1'. There is at least one reaction zone 1 between two adjacent inlet reaction zones 1', and there is at least one reaction zone 1 between the last inlet reaction zone 1' and the last reaction zone 1. That is to say, two adjacent inlet reaction zones 1' are arranged at intervals, and the last inlet reaction zone 1' and the last reaction zone 1 are arranged at intervals. The reaction zone 1 constituting the first anoxic zone downstream of each water inlet 11 has a sewage return port, and the reaction zone 1 constituting the first aerobic zone downstream of each water inlet 11 has a sludge return port.

[0025] According to the embodiment of the present utility model, the biological reaction tank 100 forms a plurality of influent reaction zones 1' by providing a plurality of reaction zones 1 with influent ports 11, so that an appropriate influent port 11 can be selected according to the influent volume, and then an appropriate number of reaction zones 1 can be selected according to the influent volume to treat sewage. This can avoid problems such as excessive residence time of sewage in the reaction zone 1, serious sludge aging, fluctuating effluent water quality, and difficult operation and maintenance.

[0026] Therefore, the biological reaction tank 100 according to the embodiment of the present utility model can effectively adjust the treatment scale, cope with the impact of different influent volumes, avoid sludge aging, ensure stable effluent water quality, effectively reduce the dosage of chemicals, greatly reduce the operation cost, and has the advantages of easy operation and easy operation.

[0027] As Figures 1-5 shown, the biological reaction tank 100 according to the embodiment of the present utility model includes a membrane tank 2 and a plurality of reaction zones 1 (biological tanks). The plurality of reaction zones 1 are connected in sequence, and the membrane tank 2 is connected to the last reaction zone 1.

[0028] Optionally, two adjacent reaction zones 1 are separated by a partition wall, and a water passing port is provided at the bottom of the partition wall. The biological reaction tank 1 further includes a lifting gate 3, and the lifting gate 3 cooperates with the water passing port to open and close the water passing port. The water passing port can be a square water passing hole. The lifting gate 3 can be a flange-type manual cast iron inlaid copper round gate.

[0029] A plurality of the plurality of reaction zones 1 have influent ports 11 to form a plurality of influent reaction zones 1'. In other words, the influent reaction zone 1' is the reaction zone 1 with an influent port 11. When the influent volume of the biological reaction tank 100 is small, the last influent port 11 can be opened and the remaining influent ports 11 can be closed so that sewage enters the last influent reaction zone 1'. The last influent port 11 (the last influent reaction zone 1') refers to the influent port 11 (influent reaction zone 1') closest to the membrane tank 2 in the flowing direction of the sewage.

[0030] As the influent volume of the biological reaction tank 100 increases, the previous influent port 11 can be gradually opened so that sewage enters the previous influent reaction zone 1', thereby increasing the treatment capacity of the biological reaction tank 100. When the influent volume of the biological reaction tank 100 reaches the maximum treatment capacity of the biological reaction tank 100, the first influent port 11 is opened so that sewage enters the first influent reaction zone 1'.

[0031] As Figure 4 and Figure 5 shown, there are at least two reaction zones 1 between two adjacent influent reaction zones 1'. This can more effectively remove nitrogen and phosphorus from sewage.

[0032] As Figure 3As shown, there is at least one reaction zone 1 between the last influent reaction zone 1' and the last reaction zone 1. Thus, when the influent volume of the biological reaction tank 100 is small, it can not only avoid the sewage staying in the reaction zone 1 for too long, but also effectively remove nitrogen and phosphorus from the sewage.

[0033] Optionally, the first of the multiple reaction zones 1 has a first influent port 11a, the Mth of the multiple reaction zones 1 has a second influent port 11b, and the Nth of the multiple reaction zones 1 has a third influent port 11c, and the Mth reaction zone 1 is located between the first reaction zone 1 and the Nth reaction zone 1. That is to say, the Mth reaction zone 1 is located downstream of the first reaction zone 1, and the Nth reaction zone 1 is located downstream of the Mth reaction zone 1.

[0034] Thus, the biological reaction tank 100 can effectively treat sewage with different influent volumes, avoiding problems such as the sewage staying in the reaction zone 1 for too long, serious sludge aging, fluctuating effluent quality, and difficult operation and maintenance.

[0035] As Figure 1 and Figures 3-5 shown, there are 10 reaction zones 1. The fifth reaction zone 1e has a second influent port 11b, and the eighth reaction zone 1h has a third influent port 11c. In other words, the first reaction zone 1, the fifth reaction zone 1e, and the eighth reaction zone 1h are the influent reaction zones 1'.

[0036] Specifically, as Figure 3 shown, when the influent volume of the biological reaction tank 100 is less than or equal to the first preset value, the third influent port 11c is opened and each of the first influent port 11a and the second influent port 11b is closed, so that sewage enters the eighth reaction zone 1h. For example, the first preset value is equal to 0.3X, where X is the maximum influent volume of the biological reaction tank 100.

[0037] The eighth reaction zone 1h forms an anoxic tank, and the eighth reaction zone 1h has a sewage reflux port. The ninth reaction zone 1i forms an aerobic tank, and the ninth reaction zone 1i has a sludge reflux port. The tenth reaction zone 1j forms an anoxic tank. Since the sewage enters the eighth reaction zone 1h through the third influent port 11c, the eighth reaction zone 1h is the reaction zone 1 that constitutes the first anoxic zone downstream of the third influent port 11c.

[0038] Since the influent volume of the biological reaction tank 100 is relatively small, there is actually a partial anaerobic region inside the eighth reaction zone 1h, that is, the eighth reaction zone 1h simultaneously constitutes an anaerobic tank and an anoxic tank. Thus, the biological reaction tank 100 has a good phosphorus removal effect, and the biological phosphorus removal rate is greater than 70%.

[0039] The sewage in the ninth reaction zone 1i (aerobic tank) flows back to the eighth reaction zone 1h (anoxic tank) through the sewage return port, and the sewage return ratio can be 200%-350%. The sludge in the membrane tank 2 flows back to the ninth reaction zone 1i (aerobic tank) through the sludge return port, and the sludge return ratio can be 150%-260%. The designed sludge concentration of the biological reaction tank 100 can be 3.0 g / L - 4.0 g / L, and the residence time of the sewage in the reaction zone 1 of the biological reaction tank 100 is about 19 hours.

[0040] A submersible centrifugal pump can be used to return the sewage. The head of the submersible centrifugal pump is 5 meters and the flow rate is 200 m 3 / h, and the submersible centrifugal pump is frequency-controlled.

[0041] A submersible centrifugal pump can be used to return the sludge. Two submersible centrifugal pumps can be set up, one for use and one for standby. The submersible centrifugal pump can be installed in the sludge return channel 5. The head of the submersible centrifugal pump is 5 meters and the flow rate is 80 m 3 / h, and the submersible centrifugal pump is frequency-controlled.

[0042] As Figure 4 shown, when the water inflow of the biological reaction tank 100 is greater than the first preset value and less than or equal to the second preset value, the second water inlet 11b is opened and each of the first water inlet 11a and the third water inlet 11c is closed, so that the sewage enters the fifth reaction zone 1e. For example, the second preset value is equal to 0.6X, where X is the maximum water inflow of the biological reaction tank 100.

[0043] The fifth reaction zone 1e constitutes an anaerobic tank, the sixth reaction zone 1f, the eighth reaction zone 1h and the tenth reaction zone 1j constitute anoxic tanks, and the seventh reaction zone 1g and the ninth reaction zone 1i constitute aerobic tanks. The sixth reaction zone 1f has a sewage return port, and the seventh reaction zone 1g has a sludge return port.

[0044] The sewage in the ninth reaction zone 1i (aerobic tank) flows back to the sixth reaction zone 1f (anoxic tank) through the sewage return port, and the sewage return ratio can be 200%-350%. The sludge in the membrane tank 2 flows back to the seventh reaction zone 1g (aerobic tank) through the sludge return port, and the sludge return ratio can be 150%-260%. The designed sludge concentration of the biological reaction tank 100 can be 3.0 g / L - 4.0 g / L, and the residence time of the sewage in the reaction zone 1 of the biological reaction tank 100 is about 18.4 hours.

[0045] As Figure 5As shown, when the water inflow of the biological reaction tank 100 is greater than the second preset value and less than or equal to the third preset value, the first water inlet 11a is opened and each of the second water inlet 11b and the third water inlet 11c is closed, so that sewage enters the first reaction zone 1a. For example, the third preset value is equal to the maximum water inflow of the biological reaction tank 100.

[0046] The first reaction zone 1a forms a pre-anoxic tank, the second reaction zone 1b forms an anaerobic tank, the third reaction zone 1c, the fourth reaction zone 1d, the seventh reaction zone 1g and the tenth reaction zone 1j form anoxic tanks, and the fifth reaction zone 1e, the sixth reaction zone 1f, the eighth reaction zone 1h and the ninth reaction zone 1i form aerobic tanks. The third reaction zone 1c has a sewage return port, and the fifth reaction zone 1e has a sludge return port.

[0047] The sewage in the ninth reaction zone 1i (aerobic tank) is returned to the third reaction zone 1c (anoxic tank) through the sewage return port, and the sewage return ratio can be 200%-350%. The sludge in the membrane tank 2 is returned to the fifth reaction zone 1e (aerobic tank) through the sludge return port, and the sludge return ratio can be 150%-260%. The designed sludge concentration of the biological reaction tank 100 can be 3.0 g / L - 4.0 g / L, and the residence time of the sewage in the reaction zone 1 of the biological reaction tank 100 is about 20.1 hours.

[0048] Optionally, each reaction zone 1 has a water inlet 11, a sewage return port, a sludge return port and a liftable aerator 4. Thus, each reaction zone 1 can be used as an anaerobic tank, an anoxic tank or an aerobic tank, thereby further improving the adjustment flexibility of the biological reaction tank 100, so that the biological reaction tank 100 can more effectively adjust the treatment scale, cope with the impact of different water inflows, and avoid sludge aging. The liftable aerator 4 can be connected to the main aeration pipe above the reaction zone 1 through a quick connector for adjustment as needed.

[0049] As Figure 1 and Figure 2 shown, the biological reaction tank 100 further includes a sludge return channel 5, a radiator 6, a hot water supply pipe 71 and a hot water return pipe 72. The sludge return channel 5 is communicated with each of the membrane tank 2 and the sludge return port, so that the sludge in the membrane tank 2 can enter the sludge return channel 5, and then the sludge is returned from the sludge return channel 5 to the sludge return port. The radiator 6 is arranged in the sludge return channel 5. The hot water supply pipe 71 is connected to the water inlet of the radiator 6, and the hot water return pipe 72 is connected to the water return port of the radiator 6.

[0050] Thus, hot water can be conveyed into the radiator 6 through the hot water supply pipe 71, and the heat of the hot water is dissipated into the sludge return channel 5 through the radiator 6, so as to increase the temperature of the sludge in the sludge return channel 5. When the sludge flows back to the reaction zone 1 serving as an aerobic tank, the temperature (water temperature) of the reaction zone 1 can be increased. Thus, the microbial activity can be maintained even in winter without increasing the dosage of chemicals additionally, thereby further reducing the operation cost and operation difficulty.

[0051] As Figure 2 shown, the biological reaction tank 100 further includes a first heat medium energy meter 81 and a second heat medium energy meter 82. The first heat medium energy meter 81 is arranged on the hot water supply pipe 71, and the second heat medium energy meter 82 is arranged on the hot water return pipe 72. Thus, the energy consumption can be monitored by using the first heat medium energy meter 81 and the second heat medium energy meter 82.

[0052] Optionally, there are multiple radiators 6, and the multiple radiators 6 are arranged at intervals along the length direction and the width direction of the sludge return channel 5. Thus, the sludge in the sludge return channel 5 can be heated more uniformly, thereby more effectively increasing the temperature (water temperature) of the reaction zone 1, so as to better maintain the microbial activity in winter.

[0053] The radiator 6 can be an eight-column steel radiator, and 8 to 12 groups of radiators 6 can be installed in the sludge return channel 5. The heat supply of the radiator 6 can be 300KW, the daily water inflow is 1000m 3 / d, the water temperature in the reaction zone 1 can be increased by 8°C - 12°C, so as to keep the water temperature in the reaction zone 1 at 10°C - 17°C. The denitrification rate of the biological reaction tank 100 can reach 0.06gNH3-N / (gMLVSS·d), and the sludge concentration is kept at 3g / L - 4g / L. Compared with summer, the microbial activity has no obvious decline, no additional chemical dosage is required, and there is no need to deliberately increase the sludge concentration. The average effluent quality of the MBR membrane tank throughout the year: COD < 15mg / L, NH3-N < 0.1mg / L, TN < 15mg / L, TP < 0.3mg / L.

[0054] The biological reaction tank 100 of the present utility model has the advantage of a relatively large adjustment range of the treatment scale, can effectively cope with the situation of small water volume and low load in the early stage of the operation of the sewage treatment plant, and can adjust the biological tank process flow according to the changes in water volume and water quality during the operation process. It has strong shock resistance, can cope with different influent conditions, and can maintain the sludge load at 0.06 - 0.08kgBOD5 / kgMLSS, avoiding the occurrence of sludge aging phenomenon.

[0055] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0056] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0057] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0058] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0059] In the present utility model, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0060] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A biological reaction tank, characterized in that: include: A plurality of reaction zones, the plurality of reaction zones are sequentially connected, a plurality of the plurality of reaction zones have water inlets to form a plurality of water inlet reaction zones, at least one reaction zone is provided between two adjacent water inlet reaction zones, at least one reaction zone is provided between the last water inlet reaction zone and the last reaction zone, wherein the reaction zone constituting the first anoxic zone downstream of each of the water inlets has a sewage return port, and the reaction zone constituting the first aerobic zone downstream of each of the water inlets has a sludge return port; and A membrane pool is connected to the last reaction zone.

2. The bioreactor according to claim 1, characterized in that: There are at least two reaction zones between two adjacent water inlet reaction zones.

3. The bioreactor according to claim 2, characterized in that: The first of the multiple reaction zones has a first water inlet, the Mth of the multiple reaction zones has a second water inlet, the Nth of the multiple reaction zones has a third water inlet, and the Mth reaction zone is located between the first reaction zone and the Nth reaction zone.

4. The bioreactor according to claim 3, characterized in that: There are 10 reaction zones, the fifth reaction zone has the second water inlet, and the eighth reaction zone has the third water inlet.

5. The bioreactor according to claim 4, characterized in that: When the water inflow of the biological reaction tank is less than or equal to the first preset value, the third water inlet is opened and each of the first water inlet and the second water inlet is closed, the eighth reaction zone constitutes an anoxic tank, the eighth reaction zone has the sewage return port, the ninth reaction zone constitutes an aerobic tank, the ninth reaction zone has the sludge return port, and the tenth reaction zone constitutes an anoxic tank; When the water inflow of the biological reaction tank is greater than the first preset value and less than or equal to the second preset value, the second water inlet is opened and each of the first water inlet and the third water inlet is closed, the fifth reaction zone constitutes an anaerobic tank, the sixth reaction zone, the eighth reaction zone and the tenth reaction zone constitute an anoxic tank, the seventh reaction zone and the ninth reaction zone constitute an aerobic tank, wherein the sixth reaction zone has the sewage return port, and the seventh reaction zone has the sludge return port; When the water inflow of the biological reaction tank is greater than the second preset value and less than or equal to the third preset value, the first water inlet is opened and each of the second water inlet and the third water inlet is closed, the first reaction zone constitutes a pre-anoxic tank, the second reaction zone constitutes an anaerobic tank, the third reaction zone, the fourth reaction zone, the seventh reaction zone and the tenth reaction zone constitute an anoxic tank, the fifth reaction zone, the sixth reaction zone, the eighth reaction zone and the ninth reaction zone constitute an aerobic tank, wherein the third reaction zone has the sewage return port, and the fifth reaction zone has the sludge return port.

6. The bioreactor according to any one of claims 1 to 5, characterized in that: Each of the reaction zones is provided with the water inlet, the sewage return port, the sludge return port and a liftable aerator.

7. The bioreactor according to claim 1, characterized in that: Further including: A sludge return channel, the sludge return channel being in communication with each of the membrane tank and the sludge return port; A radiator, wherein the radiator is arranged in the sludge return channel; as well as A hot water supply pipe and a hot water return pipe, wherein the hot water supply pipe is connected to the water inlet of the radiator, and the hot water return pipe is connected to the water return port of the radiator.

8. The bioreactor according to claim 7, characterized in that: It further includes a first heat medium energy meter and a second heat medium energy meter, wherein the first heat medium energy meter is arranged on the hot water supply pipe, and the second heat medium energy meter is arranged on the hot water return pipe.

9. The bioreactor according to claim 7, characterized in that: There are multiple radiators, and the multiple radiators are arranged at intervals along the length direction and width direction of the sludge return channel.

10. The bioreactor according to claim 1, characterized in that: Two adjacent reaction zones are separated by a partition wall, a water outlet is provided at the bottom of the partition wall, and the biological reaction pool further comprises a lifting gate, which cooperates with the water outlet to open and close the water outlet.

Images