Multi-mode biological tank

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a multi-mode biological tank, which comprises a biological tank, the biological tank comprises a tank body, a partition wall, a gate, a sludge system and a pipeline and instrument equipment system; the biological reaction tank is divided into an anaerobic zone, a first anoxic zone, a first aerobic zone, an adjustable zone, a second aerobic zone and a second anoxic zone by the partition walls, and the sequence of water flow passing through the reaction zones in the biological reaction tank is adjusted by opening and closing switching of the gates, so that switching of sewage treatment modes of the multi-mode biological tank is realized; the pipeline and instrument equipment system is used for detecting and controlling various data in the biological reaction tank, different modes of the multi-mode biological tank are switched by matching with opening and closing of the gate, compared with the traditional technology, the biological system can realize low energy consumption and low medicine consumption, and the operation and maintenance efficiency is greatly improved under the condition that the investment is hardly increased and the operation and maintenance difficulty is not increased. The engineering solution for dynamically switching different process modes is realized, and the sewage treatment efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-mode biological pond. Background Technology

[0002] Mainstream AAO process and its limitations: The anaerobic-anoxic-aerobic (AAO) process is currently the mainstream technology for wastewater treatment. It achieves nitrogen and phosphorus removal through zoning and has stable treatment effects. However, it requires maintaining a high nitrification liquor recirculation ratio (usually 200%-400%) to ensure nitrogen removal efficiency, resulting in significant energy consumption. In addition, when the carbon source is insufficient, an external carbon source needs to be added, increasing operating costs.

[0003] The recently proposed anaerobic-aerobic-anoxic (AOA) process, through process reconfiguration, eliminates internal recirculation and extends the anoxic time, utilizing internal carbon sources for nitrogen removal, thereby reducing aeration volume, sludge volume, and improving total nitrogen removal rate. However, it has poor adaptability to influent load fluctuations (such as high concentrations of COD / NH3-N), nitrification efficiency decreases under low temperature conditions, effluent stability is insufficient, and sudden changes in water quality can easily lead to incomplete denitrification in the anoxic zone.

[0004] Therefore, a single process cannot simultaneously adapt to changes in water quality, fluctuations in water temperature, and energy-saving requirements. Currently, there is a lack of engineering solutions capable of dynamically switching between different process modes. In existing engineering practices, multiple adjustable zones are often set up to achieve functional switching. These zones are equipped with both aerators and agitators, and the switching between aerobic and anoxic states is achieved by controlling the start and stop of both. However, this approach has many problems: aerator heads are prone to clogging when idle for extended periods; the installation location of agitators can interfere with the rational arrangement of aerators, and the aeration process itself can also affect the operation of agitators. In addition, since aerobic and anoxic processes require different effective volumes, there are often too many structural partitions, and the repeated installation of aerators and agitators increases investment costs and maintenance difficulties. At the same time, the monitoring instruments required for aerobic and anoxic processes are also different, further leading to redundant instrument configuration, increasing system complexity and operating costs. Summary of the Invention

[0005] The purpose of this invention is to solve two major problems in current wastewater treatment processes: first, a single operating mode cannot take into account the dynamic changes in water quality, water temperature and energy-saving requirements; second, existing engineering methods for flexibly switching process modes have serious drawbacks, including system complexity, high investment costs and high operation and maintenance difficulty.

[0006] The technical solution of this invention is:

[0007] A multi-mode biological reactor includes a biological reactor comprising a tank body, partition walls, gates, a sludge system, and a pipeline and instrumentation system. The tank body constitutes a biological reactor. The partition walls divide the biological reactor into an anaerobic zone, a first anoxic zone, a first aerobic zone, an adjustable zone, a second aerobic zone, and a second anoxic zone. The anaerobic zone is connected to an inlet channel. The gates are installed on the partition walls, and the opening and closing of the gates adjusts the order in which water flows through the various reaction zones within the biological reactor, thereby switching the wastewater treatment modes of the multi-mode biological reactor. The pipeline and instrumentation system detects and controls various data within the biological reactor, coordinating with the opening and closing of the gates to switch between different modes of the multi-mode biological reactor.

[0008] Furthermore, the wastewater treatment mode of the multi-mode biological tank includes switching between AOA and AAO basic modes:

[0009] AAO mode: The order in which water flows through each reaction zone is: anaerobic zone, first anoxic zone, first aerobic zone, and adjustable zone; among which, the adjustable zone is used as an aerobic zone;

[0010] AOA mode: The order in which water flows through each reaction zone is: anaerobic zone, first aerobic zone, first anoxic zone, and adjustable zone. The adjustable zone is used as an anoxic zone.

[0011] Furthermore, the wastewater treatment mode of the multi-mode biological tank includes switching between various modified modes of AAO and AOA:

[0012] Mode 1 (AAOAO High Energy Consumption Mode): The order in which water flows through each reaction zone is: anaerobic zone, first anoxic zone, first aerobic zone, adjustable zone, second anoxic zone, second aerobic zone; when TN index ≥ a mg / L and COD index ≥ b mg / L, the aerator in the adjustable zone is turned on and the agitator in the adjustable zone is turned off, and the adjustable zone is used as the aerobic zone;

[0013] Mode 2 (AAOAO Low Energy Consumption Mode): The order in which water flows through each reaction zone is: anaerobic zone, first anoxic zone, first aerobic zone, adjustable zone, second anoxic zone, second aerobic zone; when the ammonia nitrogen index is ≤ c mg / L, the aerator in the adjustable zone is turned off and the agitator in the adjustable zone is turned on, and the adjustable zone is used as an anoxic zone.

[0014] Mode 3 (AOAO mode): The order in which water flows through each reaction zone is as follows: When the water concentration is not high and the temperature is ≥d℃, the wastewater and sludge system can be switched to AOAO mode, anaerobic zone, first aerobic zone, first anoxic zone, adjustable zone, second anoxic zone, second aerobic zone; wherein, the agitator in the adjustable zone is turned on and the aerator in the adjustable zone is turned off, and the adjustable zone is used as an anoxic zone;

[0015] Mode 4 (AOAOAO mode): The order in which water flows through each reaction zone is as follows: both the wastewater and sludge systems are in AOAO mode, anaerobic zone, first aerobic zone, first anoxic zone, adjustable zone, second anoxic zone, second aerobic zone; when the ammonia nitrogen meter reading is ≥ e mg / L, the agitator in the adjustable zone is turned off and the aerator in the adjustable zone is turned on, and the adjustable zone is used as an aerobic zone.

[0016] Adding a third anoxic zone, a fourth aerobic zone, or more zones based on the above constitutes a multi-stage variation process; adding multiple adjustable zones allows for switching between various modes; the above arrangement principles are all variations of modes 1 and 2, and the arrangements are similar, so they will not be elaborated further.

[0017] Furthermore, for the different process modes mentioned above, a sludge system that switches with the process mode needs to be set up. The sludge system includes a sludge pumping station, a first sludge return channel, a second sludge return channel, and related equipment. The sludge pumping station is used to collect sludge discharged from the secondary sedimentation tank. It is located at the end of the biological tank and is built together with the biological tank. The sludge pumping station is equipped with a residual sludge pump and an external return pump.

[0018] An internal reflux pump is installed in the adjustable zone or the second anoxic zone; the first sludge reflux channel is located at the top of the biological tank, and a first flow meter is installed inside the channel. The first sludge reflux channel is used to connect the effluent from the external reflux pump to the inlet point of the anaerobic zone without affecting the cross-sectional area of ​​the biological tank; the second sludge reflux channel is located at the top of the biological tank, and a second flow meter is installed inside the channel. The second sludge reflux channel is used to connect the effluent from the internal reflux pump to the inlet point of the first anoxic zone without affecting the cross-sectional area of ​​the biological tank; both the first and second sludge reflux channels use pipelines for reflux; the outlets of the internal and external reflux pumps are higher than the liquid levels in the first and second sludge reflux channels to avoid backflow when the pumps are stopped; when using pipelines for reflux, a flap valve is installed at the pipeline outlet; the first and second sludge reflux channels are interconnected, and a flow regulating gate is installed at the connection point.

[0019] Furthermore, the different modes of the multi-mode biological pool include:

[0020] Multi-point water inlet mode: Adjust the opening of the first flow regulating valve and the second flow regulating valve set on the water inlet channel so that the sewage treatment mode of the multi-mode biological tank can be selected to use multi-point water inlet according to the water quality.

[0021] Maintenance mode: By opening and closing the gates, each reaction zone can be emptied separately for tank or equipment maintenance, specifically including: (1) Maintenance of the first aerobic zone: open the first gate and the sixth gate, and close the second gate, the third gate, the fourth gate and the fifth gate; (2) Maintenance of the first anoxic zone: open the second gate and the fifth gate, and close the first gate, the third gate, the fourth gate and the sixth gate.

[0022] Furthermore, the gate includes a first gate, a second gate, a third gate, a fourth gate, a fifth gate, and a sixth gate;

[0023] The anaerobic zone controls the outflow of water to the first anoxic zone through the first gate, and the anaerobic zone controls the outflow of water to the first aerobic zone through the second gate.

[0024] The first anoxic zone receives water from the first aerobic zone through the fourth gate, and receives water from the first aerobic zone through the third gate. The sixth gate controls the water to flow into the adjustable zone.

[0025] The first aerobic zone controls the outflow of water to the adjustable zone via the fifth gate.

[0026] Furthermore, the effluent from the adjustable zone is connected to the second aerobic zone, where an aerator and a third mixing device are installed simultaneously. The effluent from the second aerobic zone is then connected to the effluent channel.

[0027] Furthermore, a second anoxic zone is set up between the adjustable zone and the second aerobic zone; the inlet water of the second anoxic zone is connected to the adjustable zone, and the outlet water is connected to the second aerobic zone; a stirring device is installed in the second anoxic zone.

[0028] Furthermore, the outlet channel is located at the end of the biological pool. After the water from the biological pool enters the outlet channel through the outlet weir plate, it is connected to the subsequent outlet pipe.

[0029] Furthermore, the pipeline and instrumentation system includes a COD meter, a TN meter, a temperature meter, and an ammonia nitrogen meter. The COD meter, TN meter, and temperature meter are located at the inlet of the biological tank, while the ammonia nitrogen meter is located at the end of the aerobic zone of the biological tank.

[0030] Furthermore, the adjustable zone includes a third mixing device, which includes a drive motor, a reducer, a drive shaft, and an umbrella-shaped agitator. The outer side of the umbrella-shaped agitator is provided with circumferentially distributed arc-shaped guide ribs. A diversion groove is opened at the junction of the arc-shaped guide ribs and the umbrella-shaped agitator. The diversion groove extends from the outer side of the umbrella-shaped agitator to the inner side of the umbrella-shaped agitator. The aerator is placed at the bottom of the third mixing device.

[0031] This invention provides a multi-mode biological tank that optimizes the layout of traditional biological tanks by functional zoning, allowing interconnection or cross-zoning between zoning areas. This enables the switching of different operating modes, such as AAO and AOA, within the same tank. The AAO mode sludge return is divided into external and internal return systems, while the AOA mode does not require internal return. The external return can be a dual return system. By connecting the two sludge return channels and installing gates, flow meters, and other equipment, the sludge channels can be used in different operating modes.

[0032] By adjusting functional zones and controlling gates, multiple biological treatment systems can be switched, allowing for low energy and low chemical consumption while maintaining excellent and stable treatment results under different water temperature and quality conditions, with almost no increase in engineering investment. This realizes an engineering solution for dynamically switching different process modes, thereby improving wastewater treatment efficiency. Attached Figure Description

[0033] Figure 1 This is a process flow diagram of the present invention;

[0034] Figure 2 This is a flowchart of the AAOAO high-energy consumption mode operation of the present invention;

[0035] Figure 3 This is a flowchart of the AAOAO low-energy mode operation of the present invention;

[0036] Figure 4 This is a flowchart illustrating the AOAO mode operation of the present invention.

[0037] Figure 5 This is a flowchart illustrating the operation of the AOAOAO mode of this invention.

[0038] Figure 6 This is a flowchart of the AOA mode operation of the present invention;

[0039] Figure 7 This is a flowchart of the AAO mode operation of the present invention;

[0040] Figure 8 This is a structural reference diagram of the present invention;

[0041] Figure 9 This is a logic diagram for the mode switching of the present invention;

[0042] Figure 10 This is a structural diagram of the third stirring device of the present invention.

[0043] Attached reference numerals: 1. Sludge pump station; 2. Anaerobic zone; 3. First anoxic zone; 4. First aerobic zone; 5. Adjustable zone; 6. Second anoxic zone; 7. Second aerobic zone; 8. First gate; 9. Second gate; 10. Fourth gate; 11. Sixth gate; 12. First mixing device; 13. Second mixing device; 14. Fifth gate; 15. Waste sludge pump; 16. External return pump; 17. First sludge return channel; 18. Second sludge return channel; 20. Drive 21. Motor; 36. Second ammonia nitrogen meter; 37. Internal reflux pump; 38. First flow meter; 39. Second flow meter; 40. First flow regulating valve; 41. Second flow regulating valve; 42. Third flow regulating valve; 43. First ammonia nitrogen meter; 44. Third gate; 46. Third mixing device; 47. Fourth mixing device; 48. Reducer; 49. Arc-shaped guide rib; 50. Umbrella-shaped agitator; 51. Diverter; 52. Drive shaft. Detailed Implementation

[0044] To make the technical means, technical features, inventive purpose and technical effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0045] Example 1:

[0046] like Figure 1 As shown, this embodiment provides a multi-mode biological tank, including a biological tank with a sludge pumping station 1. The biological tank also includes independent anaerobic zone 2, a first anoxic zone 3, a first aerobic zone 4, an adjustable zone 5, a second anoxic zone 6, and a second aerobic zone 7. Switching between AAO and AOA modes is achieved through valve switching. Anaerobic zone 2 is connected to the first anoxic zone 3 via a first gate 8. The effluent from anaerobic zone 2 is controlled to enter the first aerobic zone 4 via a second gate 9. A first stirring device 12 is installed in anaerobic zone 2. The first anoxic zone 3 is connected to the first aerobic zone 4 via a fourth gate 10 and a third gate 44. The first anoxic zone 3 is connected to the adjustable zone 5 via a sixth gate 11. A second stirring device 13 is installed in the first anoxic zone 3. An aerator is installed in the first aerobic zone 4. The first aerobic zone 4 is equipped with a first ammonia nitrogen meter 43 at its end. The adjustable zone 5 is connected to the first aerobic zone 4 via a fifth gate 14. The effluent from the adjustable zone 5 is connected to the second anoxic zone 6. An aerator and a third mixing device 46 are installed in the adjustable zone, and these two devices are switched on and off according to the operating model, but cannot be activated simultaneously. The effluent from the second anoxic zone 6 is connected to the second aerobic zone 7. The second anoxic zone 6 is equipped with a fourth mixing device 47. The influent to the second aerobic zone 7 is connected to the second anoxic zone 6, and the effluent from the second aerobic zone 7 is connected to the effluent channel. The second aerobic zone 7 is equipped with a second ammonia nitrogen meter 21 at its end. Figure 10As shown, the third stirring device (46) includes a drive motor 20, a reducer 48, a drive shaft 52, and an umbrella-shaped stirrer 50. The outer surface of the umbrella-shaped stirrer 50 is provided with circumferentially distributed arc-shaped guide ribs 49. A flow divider 51 is provided at the junction of the arc-shaped guide ribs 49 and the umbrella-shaped stirrer 50. The flow divider 51 extends from the outer surface of the umbrella-shaped stirrer 50 to the inner surface of the umbrella-shaped stirrer 50. Figure 10 As shown, the drive motor 20 on the third mixing device (46) drives the umbrella-shaped agitator 50 to rotate through the reducer 48 and drive shaft 52. The umbrella-shaped agitator 50 stirs the water flow in the adjustable range to achieve mud-water mixing. The arc-shaped guide rib 49 on it can increase the resistance with water and improve the stirring effect. The diversion channel 51 is located at the junction of the arc-shaped guide rib 49 and the umbrella-shaped agitator 50, that is, at the bottom of the arc-shaped guide rib 49. When the arc-shaped guide rib 49 blocks the water flow, some water will flow into the diversion channel 51 and enter from the top of the umbrella-shaped agitator 50 to the bottom, which increases the degree of water flow disorder and improves the mud-water mixing effect.

[0047] Preferably, the sludge pumping station 1 is equipped with a residual sludge pump 15 and an external return pump 16. The flow rate of the external return pump 16 is in the range of (0.5~2)Q. A first sludge return channel 17 is provided at the top of the biological tank. The first sludge return channel 17 is used to connect the effluent of the external return pump 16 to the inlet point of the anaerobic zone 2. A first flow meter 37 is provided in the first sludge return channel 17. A second sludge return channel 18 is provided at the top of the biological tank. It does not affect the cross-sectional area of ​​the biological tank and is used to connect the effluent of the internal return pump 36 to the inlet point of the first anoxic zone 3. A second flow meter 38 is provided in the second sludge return channel 18. The first sludge return channel 17 and the second sludge return channel 18 are connected by a fourth flow regulating valve 42.

[0048] Preferably, the first and second return channels are equipped with return sludge pumps, and the outlet of the return sludge pumps is higher than the liquid level in the return channels to avoid backfilling when the pumps are stopped.

[0049] Preferably, the second hypoxic zone 6 is equipped with an internal reflux pump 36 with a flow rate range of (2~4)Q.

[0050] Specifically, the first mixing device 12, the second mixing device 13, and the fourth mixing device 47 are all existing products purchased from the market. Those skilled in the art can select appropriate product models according to actual needs. Preferably, a flow promoter is installed in the first anoxic zone 3 and the second anoxic zone 6. The flow promoter is an existing device purchased from the market. Preferably, an aerator is installed in the first aerobic zone 4, the second aerobic zone 7, and the adjustable zone 5. The aerator is an existing device purchased from the market. As an alternative, the first mixing device 12, the second mixing device 13, and the fourth mixing device 47 can adopt the structure of the third mixing device 46.

[0051] like Figure 9 As shown, this invention provides a multi-mode biological tank. By optimizing the layout of traditional biological tanks according to functional zones, these zones can be interconnected or spanned, enabling the switching of different operating modes, such as AAO and AOA, within the same tank. In AAO mode, sludge return is divided into external and internal return systems, while in AOA mode, internal return is not required, and a dual return system can be selected for external return. By connecting the two types of sludge return channels and installing equipment such as gates and flow meters, the sludge channels can be used in both operating modes.

[0052] By adjusting functional zones and controlling gates, multiple biological treatment systems can be switched, allowing for low energy and low chemical consumption with excellent and stable treatment results under different water temperature and quality conditions, without increasing engineering investment. This realizes an engineering solution for dynamically switching different process modes, thereby improving wastewater treatment efficiency.

[0053] The recommended operating scheme and mode should be determined based on the specific project's influent TN, COD, water temperature, and effluent quality requirements, taking into account factors such as the safe volume for aerobic nitrification and the carbon source utilization method for denitrification wastewater. After simulation analysis, these factors should be considered. If these conditions are not met, parameters can be selected based on the specific project circumstances, with reference to relevant guidelines. Figure 9 The logic shown operates.

[0054] During operation, the processing capacity is 20,000 m³. 3 The biological treatment tank has a capacity of / d. The influent is equipped with instruments for COD, TN, and temperature. The maximum designed influent water quality is COD 400 mg / L, TN 65 mg / L, and temperature ≥12℃, with a total retention time of 17.5 hours. See the plan layout below. Figure 1 , 2 The system comprises an anaerobic zone 2, a first anoxic zone 3, a first aerobic zone 4, an adjustable zone 5, a second anoxic zone 6, a second aerobic zone 7, a sludge system, and related equipment, instruments, and pipelines. Switching between AAO and AOA modes is achieved via valve switching. Except for maintenance conditions, in all other modes, the mixing equipment in the first and second anoxic zones, the aeration equipment in the first and second aerobic zones, and the sludge waste pump should all be normally activated. Specifically, the operating conditions are as follows:

[0055] Operating condition 1, such as Figure 2 and Figure 3 As shown, the modified AAO (five-stage Bardenpho) mode is: AA0AO mode, anaerobic / hypoxic / aerobic / hypoxic / aerobic.

[0056] When the actual influent water quality is close to the design water quality, that is, when the COD and TN indicators are high and the water temperature is low, such as COD≥350mg / L, TN≥50mg / L, and water temperature14℃, it needs to be operated in this mode, namely AA0AO high energy consumption mode.

[0057] Open: First gate 8, third gate 44 and fifth gate 14, open internal return pump 36 and external return pump 16, third flow regulating valve 41, aerator in adjustable zone 5; Close: Second gate 9, fourth gate 10 and sixth gate 11, fourth flow regulating valve 42, third mixing device 46 in adjustable zone 5.

[0058] At this time, the third flow regulating valve 41 is fully open, and the fourth flow regulating valve 42 is fully closed;

[0059] The external return pump 16 adjusts the flow rate according to the first flow meter 37, and the operating range is generally (0.5~1)Q. All external return flows are connected to the anaerobic zone 2 through the first sludge return channel 17.

[0060] The internal return pump 36 adjusts the flow rate according to the second flow meter 38, and the operating range is generally (2~4)Q. All external return flows are connected to the first anoxic zone 3 through the second sludge return channel 18.

[0061] At this time, both the sewage system and the sludge system are in AA0AO mode, which can treat water quality with high pollutant levels and low temperatures. The retention time in each zone is anaerobic:anoxic:aerobic:anoxic:aerobic = 1.5h:4h:8h:3h:1h, so the overall aeration volume is high and the energy consumption is high.

[0062] In this mode, when the ammonia nitrogen level at the first ammonia nitrogen meter 43 is less than 1.5 mg / L, the aerator in the adjustable zone 5 can be turned off and the third stirring device 46 can be turned on, operating as an anoxic tank. At this time, it is the AA0AO low-energy consumption mode, and the residence time of each zone is anaerobic:anoxic:aerobic:anoxic:aerobic = 1.5h:4h:5.5h:5.5h:1h. This reduces the residence time of the first aerobic zone 4 and increases the residence time of the second anoxic zone 6, thus lengthening the denitrification time. This reduces the energy consumption of aeration and internal recirculation, achieving more flexible control.

[0063] Operating condition 2, such as Figure 4 and Figure 5 As shown, the modified A0A mode is: A0AO mode, anaerobic / aerobic / hypoxic / aerobic.

[0064] When the actual influent water quality is significantly lower than the design water quality, i.e., when COD and TN are low and the water temperature is high, such as COD 200 mg / L, TN 40 mg / L and water temperature 20℃, the water can be operated in the modified A0A mode, i.e., A0AO mode.

[0065] Open: Second gate 9, fourth gate 10 and sixth gate 11, external return pump 16, first flow regulating valve 39, third flow regulating valve 41 and fourth flow regulating valve 42, and agitator in adjustable zone 5;

[0066] Closed: First gate 8, third gate 44 and fifth gate 14, internal reflux pump 36, second flow regulating valve 40, and aerator in adjustable zone 5.

[0067] There is no internal sludge recirculation; depending on the water quality requirements, the operating range of the external recirculation pump 16 is generally (1~2)Q. The external recirculation is a dual recirculation mode. The first sludge recirculation channel 17 and the second sludge recirculation channel 18 are both external sludge recirculation channels. The flow rate at each recirculation point is controlled by the first flow meter 37, the second flow meter 38, the third flow regulating gate, and the fourth flow regulating gate.

[0068] Both the wastewater system and the sludge system operate in an A0AO mode, which can treat water with low pollutant levels and high temperatures. The retention time in each zone is anaerobic:aerobic:anoxic:aerobic = 1.5h:5.5h:9.5h:1h, resulting in low overall aeration and energy consumption.

[0069] In this mode, if the ammonia nitrogen meter readings become high, such as when the ammonia nitrogen level at the first ammonia nitrogen meter 43 exceeds 3 mg / L or the value at the second ammonia nitrogen meter 44 exceeds 1.5 mg / L, the aerator in the adjustable zone 5 should be turned on and the third mixing device 46 should be turned off. The system should then be operated as an aerobic tank. This is the multi-segment AOA mode (AOAOAO mode), where the residence time in each zone is anaerobic:aerobic:anoxic:aerobic:anoxic:aerobic = 1.5h:5.5h:4h:2.5h:3h:1h, enabling more flexible control and ensuring that the water quality meets the standards.

[0070] Operating Condition 3, Multi-point Water Inlet Mode. By controlling the opening of the first flow regulating valve 39 and the second flow regulating valve 40 in the water inlet channel, the above two modes can be selected to use multi-point water inlet according to the water quality conditions.

[0071] Operating Condition 4, Maintenance Mode. By opening and closing the gates in each zone, a certain area can also be emptied separately for pool or equipment maintenance: (1) Maintenance of the first aerobic zone 4

[0072] Open: Gate 8 (first gate) and Gate 11 (sixth gate)

[0073] Close: Second gate 9, third gate 44, fourth gate 10 and fifth gate 14.

[0074] (2) Maintenance and repair of the first hypoxia zone 3

[0075] Open: Second gate 9 and fifth gate 14.

[0076] Close: Gate 8 (first gate), Gate 44 (third gate), Gate 10 (fourth gate), and Gate 11 (sixth gate).

[0077] Operating condition 5, other modes. (e.g.) Figure 6 and Figure 7As shown, canceling the second anoxic zone 6 and the second aerobic zone 7 is the most traditional AAO and AOA mode switching. Adding a third anoxic zone, a fourth aerobic zone, or more zones is a multi-stage variation process; adding multiple adjustable zones 5 can increase the number of mode switching options; the above arrangement principles are all variations of working conditions 1 and 2, and the arrangements are similar, so they will not be described in detail.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. A multi-mode biological pond, comprising a biological pond, characterized in that: The biological reactor includes a tank body, partition walls, gates, a sludge system, and a pipeline and instrumentation system. The tank body constitutes a biological reactor. The partition walls divide the biological reactor into an anaerobic zone (2), a first anoxic zone (3), a first aerobic zone (4), an adjustable zone (5), a second aerobic zone (7), and a second anoxic zone (6). The anaerobic zone (2) is connected to the inlet channel. The gates are installed on the partition walls. The order in which water flows through each reaction zone in the biological reactor is adjusted by opening and closing the gates, so as to realize the switching of the sewage treatment mode of the multi-mode biological reactor. The pipeline and instrumentation system detects and controls various data in the biological reactor and switches the different modes of the multi-mode biological reactor in conjunction with the opening and closing of the gates.

2. The multi-mode biological pond according to claim 1, characterized in that: The sludge system includes a sludge pumping station (1), a first sludge return channel (17), a second sludge return channel (18), and related equipment. The sludge pumping station (1) is used to collect sludge discharged from the secondary sedimentation tank. It is located at the end of the biological tank and is built together with the biological tank. The sludge pumping station (1) is equipped with a residual sludge pump (15) and an external return pump (16). An internal return pump (36) is installed in the adjustable zone (5) or the second anoxic zone (6); a first sludge return channel (17) is installed at the top of the biological tank, and a first flow meter (37) is installed in the channel. The first sludge return channel (17) is used to connect the effluent from the external return pump (16) to the inlet point of the anaerobic zone (2) without affecting the cross-sectional area of ​​the biological tank; a second sludge return channel (18) is installed at the top of the biological tank, and a second flow meter (38) is installed in the channel. The second sludge return channel (18) is used to connect the effluent from the internal return pump (36) to the inlet point of the first anoxic zone (2). The oxygen zone (3) inlet point does not affect the cross-section of the biological tank; the first sludge return channel (17) and the second sludge return channel (18) are both recirculated through pipelines; the outlets of the internal return pump (36) and the external return pump (16) are higher than the liquid levels in the first sludge return channel (17) and the second sludge return channel (18) to avoid backfilling when the pumps are stopped; when using pipelines for recirculation, a flap valve is installed at the pipeline outlet; the first sludge return channel (17) and the second sludge return channel (18) are interconnected, and a flow regulating gate is installed at the connection point between the two.

3. The multi-mode biological pond according to claim 1, characterized in that, The wastewater treatment modes of the multi-mode biological tank include switching between AOA and AAO basic modes: AAO mode: The order in which the water flows through each reaction zone is: anaerobic zone (2), first anoxic zone (3), first aerobic zone (4), adjustable zone (5); among which, the adjustable zone (5) is used as an aerobic zone (aerobic zone); AOA mode: The order in which water flows through each reaction zone is: anaerobic zone (2), first aerobic zone (4), first anoxic zone (3), adjustable zone (5); among which, the adjustable zone (5) is used as an anoxic zone.

4. The multi-mode biological pond according to claim 1, characterized in that, The wastewater treatment modes of the multi-mode biological tank include switching between various modified modes of AAO and AOA: AAOAO high energy consumption mode: The order in which water flows through each reaction zone is: anaerobic zone (2), first anoxic zone (3), first aerobic zone (4), adjustable zone (5), second anoxic zone (6), second aerobic zone (7); among them, the aerator in the adjustable zone (5) is turned on, the stirrer in the adjustable zone (5) is turned off, and the adjustable zone (5) is used as an aerobic zone; AAOAO low energy consumption mode: The order in which water flows through each reaction zone is: anaerobic zone (2), first anoxic zone (3), first aerobic zone (4), adjustable zone (5), second anoxic zone (6), second aerobic zone (7); among them, the aerator of the adjustable zone (5) is closed, the stirrer of the adjustable zone (5) is turned on, and the adjustable zone (5) is used as an anoxic zone; AOAO mode: The order in which water flows through each reaction zone is: anaerobic zone (2), first aerobic zone (4), first anoxic zone (3), adjustable zone (5), second anoxic zone (6), second aerobic zone (7); among them, the agitator in the adjustable zone (5) is turned on, the aerator in the adjustable zone (5) is turned off, and the adjustable zone (5) is used as an anoxic zone; AOAOAO mode: The order in which the water flows through each reaction zone is: anaerobic zone (2), first aerobic zone (4), first anoxic zone (3), adjustable zone (5), second anoxic zone (6), second aerobic zone (7); among them, the agitator in the adjustable zone (5) is turned off, and the aerator in the adjustable zone (5) is turned on, and the adjustable zone (5) is used as an aerobic zone.

5. The multi-mode biological pond according to claim 1, characterized in that, The different modes of the multi-mode biological pool include: Multi-point water inlet mode: Adjust the opening of the first flow regulating valve (39) and the second flow regulating valve (40) set on the water inlet channel so that the sewage treatment mode of the multi-mode biological tank can be selected according to the water quality conditions to choose whether to adopt multi-point water inlet; Maintenance mode: By opening and closing the gates, each reaction zone can be emptied separately for tank or equipment maintenance, specifically including: (1) First aerobic zone (4) Maintenance: Open the first gate (8) and the sixth gate (11), and close the second gate (9), the third gate (44), the fourth gate (10) and the fifth gate (14); (2) First anoxic zone (3) Maintenance: Open the second gate (9) and the fifth gate (14), and close the first gate (8), the third gate (44), the fourth gate (10) and the sixth gate (11).

6. The multi-mode biological pond according to claim 1, characterized in that: The gates include a first gate (8), a second gate (9), a third gate (44), a fourth gate (10), a fifth gate (14), and a sixth gate (11). Among them, the anaerobic zone (2) controls the outflow of water to enter the first anoxic zone (3) through the first gate (8), and controls the outflow of water to enter the first aerobic zone (4) through the second gate (9); The first anoxic zone (3) controls the water intake to be connected to the first aerobic zone (4) through the fourth gate (10), controls the water output to be connected to the first aerobic zone (4) through the third gate (44), and controls the water output to be connected to the adjustable zone (5) through the sixth gate (11). The first aerobic zone (4) controls the outflow of water to the adjustable zone (5) through the fifth gate (14).

7. The multi-mode biological pond according to claim 5, characterized in that: The effluent from the adjustable zone (5) is connected to the second aerobic zone (7). An aerator and a third stirring device (46) are installed in the adjustable zone (5). The effluent from the second aerobic zone (7) is connected to the effluent channel. The effluent channel is located at the end of the biological tank. After the effluent from the biological tank enters the effluent channel through the effluent weir plate, it is connected to the subsequent effluent pipe.

8. The multi-mode biological pond according to claim 6, characterized in that: A second anoxic zone (6) is set between the adjustable zone (5) and the second aerobic zone (7); the inlet water of the second anoxic zone (6) is connected to the adjustable zone (5), and the outlet water is connected to the second aerobic zone (7). A stirring device is set in the second anoxic zone (6).

9. The multi-mode biological pond according to claim 6, characterized in that: The piping and instrumentation system includes COD, TN, temperature and ammonia nitrogen meters. The COD, TN and temperature meters are located at the inlet of the biological tank, and the ammonia nitrogen meter is located at the end of the aerobic zone of the biological tank.

10. The multi-mode biological pond according to claim 6, characterized in that: The third mixing device (46) is located in the adjustable zone (5). The third mixing device (46) includes a drive motor (20), a reducer (48), a drive shaft (52), and an umbrella-shaped agitator (50). The outer side of the umbrella-shaped agitator (50) is provided with arc-shaped guide ribs (49) distributed in a circular pattern. A diversion groove (51) is provided at the junction of the arc-shaped guide ribs (49) and the umbrella-shaped agitator (50). The diversion groove (51) extends from the outer side of the umbrella-shaped agitator (50) to the inner side of the umbrella-shaped agitator (50). The aerator is located at the bottom of the third mixing device (46).

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