Biopond aeration control system

Abstract

The utility model relates to a biological pool aeration control system belongs to sewage treatment technical field, and the main purpose is dynamic adjustment the gas amount that passes in each biological pool, avoids because dissolved oxygen is too high or too low and influences processing efficiency or causes energy consumption waste. The biological pool aeration control system includes gas supply main pipe, a plurality of gas supply branch pipes and controller, gas supply main pipe is connected with at least two air blowers, is used for receiving the gas of air blower output, a plurality of gas supply branch pipes are set up with a plurality of biological pools one to one, and one end of each gas supply branch pipe is communicated with gas supply main pipe, and the other end is used to communicate with corresponding biological pool to guide the gas of gas supply main pipe delivery into biological pool, and the dissolved oxygen on -line detection instrument is equipped in biological pool, and the adjusting valve and flowmeter are sequentially arranged on each gas supply branch pipe along the gas flow direction, and the adjusting valve is used for adjusting the gas flow in the gas supply branch pipe, and the flowmeter is used for detecting the gas flow in the gas supply branch pipe, and the controller is electrically connected with dissolved oxygen on -line detection instrument, adjusting valve and flowmeter respectively.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment technology, specifically relating to a biological tank aeration control system. Background Technology

[0002] In wastewater treatment and other fields, biological treatment tanks are core facilities that utilize the metabolic processes of microorganisms to remove pollutants from water, while aeration is a crucial step in maintaining the activity of microorganisms within the tank. By introducing air or oxygen into the biological treatment tank, dissolved oxygen (DO) is provided for the microorganisms' metabolism, while simultaneously promoting mixing and mass transfer in the water, ensuring efficient degradation of pollutants.

[0003] However, traditional aeration systems supply a fixed amount of air to multiple biological tanks, making it difficult to accurately match the real-time needs of different tanks. This can easily lead to excessively high or low dissolved oxygen levels in the tanks. Excessively high dissolved oxygen levels result in energy waste, while excessively low levels negatively impact treatment efficiency. Utility Model Content

[0004] In view of this, this application provides a biological tank aeration control system, the main purpose of which is to dynamically adjust the amount of gas introduced into each biological tank so that the dissolved oxygen in each biological tank is maintained within a suitable range for microbial metabolism, and to avoid affecting the treatment efficiency or causing energy waste due to excessively high or low dissolved oxygen.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] This application provides an aeration control system for a biological pond, including:

[0007] A gas supply main pipe, which is connected to at least two blowers, is used to receive gas output from the blowers;

[0008] Multiple gas supply branch pipes are provided, each corresponding to a biological tank. One end of each gas supply branch pipe is connected to the main gas supply pipe, and the other end is connected to the corresponding biological tank to introduce the gas supplied by the main gas supply pipe into the biological tank. An online dissolved oxygen detector is provided in each biological tank. Each gas supply branch pipe is equipped with a regulating valve and a flow meter in sequence along the gas flow direction. The regulating valve is used to regulate the gas flow rate in the gas supply branch pipe, and the flow meter is used to detect the gas flow rate in the gas supply branch pipe.

[0009] The controller is electrically connected to the dissolved oxygen online detector, the regulating valve, and the flow meter.

[0010] Optionally, the biological tank is divided into a front section, a middle section, and a rear section along the water flow direction, and the dissolved oxygen online detector is installed in the middle section to detect the dissolved oxygen concentration in the middle section.

[0011] Optionally, the air supply branch pipe is connected to the biological tank through at least three aeration branch pipes, and the at least three aeration branch pipes are arranged one-to-one with the front section, the middle section and the rear section of the biological tank, and each aeration branch pipe is equipped with an aeration head at its air outlet end.

[0012] Optionally, the controller is also electrically connected to the blower, and the controller is configured to control the blower to increase the air volume when the average dissolved oxygen concentration of each of the biological tanks is lower than the lower limit of a preset concentration range.

[0013] Optionally, the controller is also electrically connected to the blower, and the controller is configured to control the blower to reduce the air volume when the average dissolved oxygen concentration in each of the biological tanks is higher than the upper limit of a preset concentration range.

[0014] Optionally, the controller is also electrically connected to the blower, and the controller is configured to control the blower to maintain the current output air volume when the average dissolved oxygen concentration of each of the biological tanks is within a preset concentration range.

[0015] Optionally, the adjustment step size of the blower is 2% to 4%, and the adjustment step frequency of the blower is 15 min to 20 min.

[0016] Optionally, the biological tank aeration control system further includes:

[0017] A bypass vent pipe is provided, which is connected to the main gas supply pipe. A vent valve is provided on the bypass vent pipe, and the vent valve is electrically connected to the controller.

[0018] Optionally, the controller is configured to open the vent valve when the average dissolved oxygen concentration of each of the biological tanks is higher than the upper limit of a preset concentration range and the current output air volume of the blower is the minimum air volume threshold.

[0019] Optionally, the biological tank aeration control system further includes:

[0020] A pressure transmitter is installed on the main gas supply pipe to detect the pressure value inside the main gas supply pipe. The pressure transmitter is electrically connected to the controller, which is configured to control the vent valve to open when the pressure value inside the main gas supply pipe is higher than the upper limit of a preset pressure range.

[0021] By employing the above technical solution, this application has at least the following beneficial effects:

[0022] The biological tank aeration control system provided in the embodiments of this application monitors the dissolved oxygen concentration in each biological tank in real time by installing an online dissolved oxygen detector in each tank, and feeds the data back to the controller. The controller, combined with the real-time gas flow rate detected by the flow meters on each air supply branch pipe, dynamically adjusts the regulating valves of the corresponding air supply branch pipes, thereby controlling the amount of gas supplied to each biological tank. This ensures that the dissolved oxygen concentration in each tank is always maintained within a suitable range for microbial metabolism, avoiding the problems of excessively high or low dissolved oxygen levels caused by traditional fixed gas supply. It is understood that excessively high dissolved oxygen levels will lead to energy waste in equipment such as blowers. This system, by adjusting the air supply on demand, can reduce unnecessary gas output while ensuring treatment effectiveness, thereby reducing the load on the blowers, achieving energy saving and consumption reduction, and improving the system's operational economy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a biological pond aeration control system according to an optional embodiment of this application.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Main gas supply pipe; 2. Branch gas supply pipe; 3. Aeration branch pipe; 4. Bypass drain pipe; 5. Blower; 6. Biological tank; 7. Regulating valve; 8. Flow meter; 9. Aeration head; 10. Drain valve; 11. Pressure transmitter. Detailed Implementation

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0030] See Figure 1 As shown in the embodiment of this application, a biological tank aeration control system is provided, including a main air supply pipe 1, multiple branch air supply pipes 2, and a controller. The main air supply pipe 1 is connected to at least two blowers 5 and is used to receive the gas output by the blowers 5. The multiple branch air supply pipes 2 are arranged one-to-one with multiple biological tanks 6. One end of each branch air supply pipe 2 is connected to the main air supply pipe 1, and the other end is used to connect to the corresponding biological tank 6 to introduce the gas supplied by the main air supply pipe 1 into the biological tank 6. An online dissolved oxygen detector is provided in the biological tank 6. A regulating valve 7 and a flow meter 8 are arranged sequentially along the gas flow direction on each branch air supply pipe 2. The regulating valve 7 is used to regulate the gas flow rate in the branch air supply pipe 2, and the flow meter 8 is used to detect the gas flow rate in the branch air supply pipe 2. The controller is electrically connected to the online dissolved oxygen detector, the regulating valve 7, and the flow meter 8.

[0031] The biological tank aeration control system provided in this application, by installing an online dissolved oxygen detector in each biological tank 6, can monitor the dissolved oxygen concentration in each biological tank 6 in real time and feed the data back to the controller. The controller, combined with the real-time gas flow rate detected by the flow meter 8 on each air supply branch pipe 2, dynamically adjusts the regulating valve 7 of the corresponding air supply branch pipe 2, thereby controlling the amount of gas supplied to each biological tank 6. This ensures that the dissolved oxygen concentration in each biological tank 6 is always maintained within a suitable range for microbial metabolism, avoiding the problems of excessively high or low dissolved oxygen caused by traditional fixed gas supply. It is understood that excessively high dissolved oxygen levels will lead to energy waste in equipment such as the blower 5. This system, by adjusting the air supply on demand, can reduce unnecessary gas output while ensuring treatment effectiveness, thereby reducing the load on the blower 5, achieving energy saving and consumption reduction, and improving the system's operational economy.

[0032] Among them, the gas supply main pipe 1 is used to collect the gas output from multiple blowers 5 to form a unified gas source.

[0033] Specifically, the main gas supply pipe 1 is connected to at least two blowers 5 to ensure reliable gas supply. The total gas supply can be adjusted by frequency conversion or start / stop control. Here, at least two blowers 5 are connected in parallel.

[0034] Among them, the gas supply branch pipe 2 corresponds one-to-one with the biological tank 6, and is used to distribute the gas from the gas supply main pipe 1 to each biological tank 6 and realize independent flow control.

[0035] Specifically, one end of the gas supply branch pipe 2 is connected to the main gas supply pipe 1, and the other end is connected to the corresponding biological pool 6.

[0036] Each gas supply branch pipe 2 is equipped with a regulating valve 7 and a flow meter 8 in sequence along the airflow direction.

[0037] Specifically, the regulating valve 7 can be an electric regulating valve or a pneumatic regulating valve, etc., and this application does not limit it. The flow meter 8 can be an orifice plate flow meter or an electromagnetic flow meter, etc., and this application does not limit it.

[0038] Among them, the dissolved oxygen online detector is used to detect the dissolved oxygen concentration in biological pond 6 in real time, providing feedback data for control.

[0039] The controller receives sensor data, executes a control algorithm (if any), and outputs adjustment commands. It should be noted that if no control algorithm (such as a PID algorithm) is available, the controller can directly compare the sensor data with preset thresholds and output discrete commands of "on / off" or "high / low" levels based on the comparison result. For example, if the dissolved oxygen concentration is below the lower limit, the controller directly outputs the maximum opening command; if it is above the upper limit, it outputs the minimum opening command. Here, sensor data refers to dissolved oxygen concentration data and gas flow rate data.

[0040] Specifically, the controller connects to the online dissolved oxygen monitor, flow meter 8, and regulating valve 7 via signal lines or a communication interface. Here, the online dissolved oxygen monitor and flow meter 8 act as data inputs, continuously transmitting the dissolved oxygen concentration in the biological tank 6 and the gas flow rate from the aeration branch 2 to the controller, while the regulating valve 7 acts as a control output, receiving commands from the controller. During system operation, the user or system pre-sets the target dissolved oxygen value for each biological tank 6. The controller compares the real-time collected dissolved oxygen concentration with the target value, calculates the deviation, and then uses a PID algorithm to dynamically adjust the opening of the regulating valve 7: when the dissolved oxygen concentration is low, the opening of the regulating valve 7 is increased to increase the gas flow rate; conversely, the opening is decreased to reduce the gas flow rate. This closed-loop control mechanism not only achieves dynamic balance of dissolved oxygen, effectively avoiding the lag of traditional fixed aeration modes, but also allows each biological tank 6's aeration branch to be independently adjusted according to its own water quality differences or treatment stage requirements, significantly improving the system's adaptability and treatment efficiency.

[0041] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, biological pond 6 is divided into front, middle and rear sections along the water flow direction. The dissolved oxygen online detector is set in the middle section to detect the dissolved oxygen concentration in the middle section.

[0042] It is understandable that the pollutant degradation process within biological pond 6 is phased, with the middle section being the area of ​​most vigorous microbial metabolic activity and the most intense pollutant degradation reaction, where the demand for dissolved oxygen is also most critical. Setting the online dissolved oxygen monitor in the middle section directly reflects the dissolved oxygen concentration level in the core reaction zone of biological pond 6, providing more representative data for aeration adjustment and avoiding inaccurate adjustments due to deviations in the monitoring location.

[0043] It should be noted that installing detectors in all sections of the biological tank would increase system cost and control complexity; however, detecting only the middle section can capture the dissolved oxygen characteristics of the core reaction area, simplify the system structure, reduce implementation costs while ensuring the effectiveness of regulation, and optimize cost-effectiveness.

[0044] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the air supply branch pipe 2 is connected to the biological tank 6 through at least three aeration branch pipes 3. The at least three aeration branch pipes 3 are set one-to-one with the front, middle and rear sections of the biological tank 6, and each aeration branch pipe 3 is equipped with an aeration head 9 at its air outlet end.

[0045] Understandably, the dissolved oxygen requirements of the front, middle, and rear sections of the biological tank 6 along the water flow direction differ due to variations in pollutant concentration and microbial activity. For example, the front section has a higher pollutant concentration and faster microbial oxygen consumption, potentially requiring a higher initial oxygen supply; the rear section has fewer pollutants, resulting in relatively lower oxygen demand. By segmenting the aeration pipes 3, oxygen can be supplied independently to each area based on its actual needs, avoiding the problems of excessively high or insufficient dissolved oxygen in certain areas caused by traditional overall aeration, thus improving the targeted nature of aeration.

[0046] Among them, the gas supply branch pipe 2 serves as the main gas supply channel and is used to receive compressed air from the gas supply main pipe 1.

[0047] Among them, the aeration branch pipe 3 is a branch pipe of the air supply branch pipe 2, and at least three are set up to correspond to the front section, middle section and rear section of the biological tank 6 respectively. Each aeration branch pipe 3 independently supplies air to the corresponding area.

[0048] Among them, the aeration head 9 is set at the air outlet of each aeration branch pipe 3, that is, the bottom or side wall of the front, middle and rear sections of the biological tank 6, to disperse air into tiny bubbles, increase the gas-liquid contact area and improve oxygen mass transfer efficiency.

[0049] Specifically, the front section of biological tank 6 is a high-load zone with high influent pollutant concentration, active microbial metabolism, and high oxygen consumption. The pollutant concentration decreases in the middle section of biological tank 6, but microorganisms still require stable dissolved oxygen to maintain activity. The pollutant concentration further decreases in the rear section of biological tank 6, resulting in a relatively reduced demand for dissolved oxygen, which may be used for fine-tuning the effluent quality. In this embodiment, the total flow rate of the air supply branch pipe 2 is adjusted by regulating valve 7. Simultaneously, the diameter, length, or additional valves (such as subdivision valves, which may exist but are not mentioned) of each aeration branch pipe 3 are used to achieve differentiated distribution of air supply to each section. Here, the dissolved oxygen detector in the middle section provides real-time data feedback. The controller adjusts the regulating valve 7 on the air supply branch pipe 2 using a PID algorithm, indirectly affecting the air distribution of each aeration branch pipe 3 (if no subdivision valves are provided), or directly controlling the subdivision valves to achieve more precise segmented adjustment.

[0050] In some possible embodiments disclosed in this application, the controller is also electrically connected to the blower 5, and the controller is configured to control the blower 5 to increase the air volume when the average dissolved oxygen concentration of each biological tank 6 is lower than the lower limit of a preset concentration range.

[0051] In this embodiment, when the average dissolved oxygen concentration of each biological tank 6 is lower than the lower limit of the preset concentration range, it indicates that the total air supply of the blower 5 may not be able to meet the overall oxygen demand of all biological tanks 6. At this time, the controller controls the blower 5 to increase the air volume, which can improve the total air supply capacity from the source, avoid the problem of low dissolved oxygen in each biological tank 6 due to insufficient total air volume, and ensure the overall stability of the biochemical reaction.

[0052] In some possible embodiments disclosed in this application, the controller is also electrically connected to the blower 5, and the controller is configured to control the blower 5 to reduce the air volume when the average dissolved oxygen concentration of each biological tank 6 is higher than the upper limit of a preset concentration range.

[0053] In this embodiment, when the average dissolved oxygen level in all biological tanks 6 remains above the lower limit of a preset concentration range, it indicates that the current total gas supply exceeds the actual demand. Reducing the airflow of blower 5 at this time can directly lower its energy consumption.

[0054] In some possible embodiments disclosed in this application, the controller is also electrically connected to the blower 5, and the controller is configured to control the blower 5 to maintain the current output air volume when the average dissolved oxygen concentration of each biological tank 6 is within a preset concentration range.

[0055] In this embodiment, when the average dissolved oxygen concentration of each biological tank 6 is within a preset concentration range, it indicates that the current total air supply is basically matched with the overall oxygen consumption demand of the biological tank 6, and the microorganisms are in a suitable metabolic environment. At this time, the controller controls the blower 5 to maintain the current output air volume, which can avoid the dissolved oxygen concentration from deviating from the suitable range due to unnecessary fluctuations in air volume, ensuring that the degradation process of pollutants by microorganisms in the biological tank 6 is stable and efficient, thereby ensuring that the effluent water quality meets the standards.

[0056] It should be noted that in this embodiment, the aeration control system for the biological tanks adopts a hierarchical control strategy, which ensures both the individualized needs of each biological tank 6 and optimizes overall energy consumption. Specifically, the hierarchical control strategy includes branch-level control and main-level control. In branch-level control, the aeration rate of each biological tank 6 is independently adjusted by the regulating valve 7 on each air supply branch pipe 2 to maintain the dissolved oxygen concentration near the target value. In main-level control, the controller continuously calculates the average dissolved oxygen concentration of all biological tanks 6 and compares it with a preset concentration range (e.g., 2 to 4 mg / L): if the average value is lower than the lower limit (e.g., <2 mg / L), the blower 5 is triggered for incremental control; if the average value is higher than the upper limit (e.g., >4 mg / L), the blower 5 is triggered for reduced control.

[0057] Understandably, the control of blower 5 includes frequency conversion control and start-stop control. In frequency conversion control, the frequency of the blower 5 motor is adjusted to achieve continuous airflow regulation. In start-stop control, the number of operating blowers 5 is increased or decreased.

[0058] In the above embodiments, the adjustment step size of the blower 5 is 2% to 4%, and the adjustment step frequency of the blower 5 is 15 min to 20 min.

[0059] Here, limiting the adjustment step size to a small range of 2% to 4% prevents a sudden rise or fall in air pressure within the main air supply pipe 1 due to large adjustments in the blower 5's airflow, thus avoiding any impact on the flow stability of each air supply branch pipe 2. The adjustment step frequency of 15 to 20 minutes provides sufficient response time for the system. It is understandable that changes in dissolved oxygen concentration within the biological tank 6 exhibit a lag; the 15 to 20 minute adjustment step frequency prevents over-adjustment or oscillations caused by frequent adjustments, ensuring that the dissolved oxygen concentration fluctuates smoothly within the target range.

[0060] The adjustment step size is a percentage of the current output air volume of blower 5.

[0061] The adjustment step frequency is the time interval between two consecutive air volume adjustment operations.

[0062] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1As shown, the biological tank aeration control system also includes a bypass drain pipe, which is connected to the main gas supply pipe 1. A drain valve 10 is installed on the bypass drain pipe, and the drain valve 10 is electrically connected to the controller.

[0063] In this embodiment, when the air pressure in the main gas supply pipe 1 suddenly increases due to factors such as the adjustment of the blower 5 or sudden changes in the gas consumption of the biological tank 6, the controller can release excess gas through the bypass vent pipe by opening the vent valve 10. This prevents excessively high air pressure in the main gas supply pipe 1 from damaging equipment such as pipes, valves, and flow meters 8, and also prevents air pressure fluctuations from affecting the flow stability of each branch pipe 2, ensuring the accuracy of aeration regulation. For example, in the main pipe-level control, if the average dissolved oxygen concentration in the biological tank 6 is higher than the upper limit of the preset concentration range, and the total air supply needs to be reduced, in addition to reducing the output of the blower 5 by frequency conversion or shutting down some blowers 5, if there is a momentary excess of air volume during the adjustment process, the excess gas can be quickly released by opening the vent valve 10 to help the total air volume quickly return to a reasonable range. Conversely, if a sudden situation causes a brief abnormality in air pressure, the vent valve 10 can also be used to adjust it in time, improving the system's ability to cope with fluctuations in operating conditions.

[0064] Among them, the bypass vent pipe is a branch pipe that is directly connected to the main gas supply pipe 1 and is independent of the gas supply branch pipe 2. The end of it that is far away from the main gas supply pipe 1 can be introduced into the wastewater pool to aerate and release excess gas.

[0065] The vent valve 10 is installed on the bypass vent pipe. The vent valve 10 can be an electric valve or a pneumatic valve. It is connected to the controller via a signal line and receives instructions from the controller to open and close.

[0066] In the above embodiment, the controller is configured to open the vent valve 10 when the average dissolved oxygen concentration of each biological tank 6 is higher than the upper limit of the preset concentration range and the current output air volume of the blower 5 is the minimum air volume threshold.

[0067] Here, when the average dissolved oxygen concentration in biological tank 6 exceeds the preset upper limit, and blower 5 is already at its lowest airflow output (meaning further reducing the airflow cannot decrease the air supply), opening the vent valve 10 to release excess gas in the main air supply pipe 1 directly reduces the total airflow entering each biological tank 6, preventing a continuous increase in dissolved oxygen concentration. This avoids microbial metabolic imbalance caused by excessively high dissolved oxygen levels, ensuring stable pollutant degradation efficiency in biological tank 6.

[0068] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1As shown, the biological tank aeration control system also includes a pressure transmitter 11, which is installed on the air supply main pipe 1 and is used to detect the pressure value in the air supply main pipe 1. The pressure transmitter 11 is electrically connected to the controller, which is configured to control the vent valve 10 to open when the pressure value in the air supply main pipe 1 is higher than the upper limit of the preset pressure range.

[0069] In this embodiment, the pressure transmitter 11 monitors the pressure in the main gas supply pipe 1 in real time. When the pressure exceeds the preset upper limit, the controller immediately triggers the vent valve 10 to open, quickly releasing the excessive pressure and preventing mechanical damage (such as pipe rupture, seal failure, etc.) to the main pipeline and aeration equipment (such as aeration discs and blowers 5) due to long-term overpressure, thus extending the service life of the equipment.

[0070] The preset pressure range is the optimal pressure range for aeration in the corresponding biological tank 6. When the pressure exceeds the limit, the pressure can be quickly restored to the preset pressure range by releasing pressure through the vent valve 10, reducing fluctuations in aeration intensity caused by abnormal pressure.

[0071] Specifically, the electrical connection between the pressure transmitter 11 and the controller forms a closed-loop control, eliminating the need for manual real-time monitoring of the pressure value. When the pressure exceeds the limit, it can automatically trigger the venting operation, reducing the workload of manual inspection and operation, and is especially suitable for large or complex aeration systems.

[0072] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0073] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A biological tank aeration control system characterized by, include: Gas supply main pipe (1), which is connected to at least two blowers (5) for receiving gas output by the blowers (5); Multiple gas supply branch pipes (2) are provided, and multiple gas supply branch pipes (2) are provided one-to-one with multiple biological pools (6). One end of each gas supply branch pipe (2) is connected to the main gas supply pipe (1), and the other end is used to connect to the corresponding biological pool (6) so as to introduce the gas delivered by the main gas supply pipe (1) into the biological pool (6). The biological pool (6) is equipped with an online dissolved oxygen detector. Each gas supply branch pipe (2) is provided with a regulating valve (7) and a flow meter (8) in sequence along the gas flow direction. The regulating valve (7) is used to regulate the gas flow rate in the gas supply branch pipe (2), and the flow meter (8) is used to detect the gas flow rate in the gas supply branch pipe (2). The controller is electrically connected to the dissolved oxygen online detector, the regulating valve (7) and the flow meter (8).

2. The biological tank aeration control system according to claim 1, wherein The biological pool (6) is divided into a front section, a middle section and a rear section along the water flow direction. The dissolved oxygen online detector is set in the middle section to detect the dissolved oxygen concentration in the middle section.

3. The biological tank aeration control system according to claim 2, wherein The air supply branch pipe (2) is connected to the biological tank (6) through at least three aeration branch pipes (3). The at least three aeration branch pipes (3) are arranged one-to-one with the front section, the middle section and the rear section of the biological tank (6), and each aeration branch pipe (3) is equipped with an aeration head (9) at its air outlet end.

4. The biological tank aeration control system of claim 1, wherein, The controller is also electrically connected to the blower (5), and the controller is configured to control the blower (5) to increase the air volume when the average dissolved oxygen concentration of each of the biological tanks (6) is lower than the lower limit of a preset concentration range.

5. The biological tank aeration control system of claim 1, wherein, The controller is also electrically connected to the blower (5), and the controller is configured to control the blower (5) to reduce the air volume when the average dissolved oxygen concentration of each of the biological tanks (6) is higher than the upper limit of a preset concentration range.

6. The biological tank aeration control system of claim 1, wherein, The controller is also electrically connected to the blower (5), and the controller is configured to control the blower (5) to maintain the current output air volume when the average dissolved oxygen concentration of each of the biological tanks (6) is within a preset concentration range.

7. The biological tank aeration control system according to claim 4 or 5, characterized by, The adjustment step size of the blower (5) is 2% to 4%, and the adjustment step frequency of the blower (5) is 15 min to 20 min.

8. The biological tank aeration control system of claim 1, wherein, Also includes: A bypass vent pipe is connected to the main gas supply pipe (1). A vent valve (10) is installed on the bypass vent pipe and is electrically connected to the controller.

9. The biological tank aeration control system of claim 8, wherein, The controller is configured to open the vent valve (10) when the average dissolved oxygen concentration of each of the biological pools (6) is higher than the upper limit of the preset concentration range and the current output air volume of the blower (5) is the minimum air volume threshold.

10. The biological tank aeration control system of claim 8, wherein, Also includes: A pressure transmitter (11) is arranged on the gas supply main pipe (1) to detect the pressure value in the gas supply main pipe (1), and the pressure transmitter (11) is electrically connected to the controller, and the controller is configured to control the exhaust valve (10) to open when the pressure value in the gas supply main pipe (1) is higher than the upper limit value of the preset pressure range.

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