A method for regulating the operation process of a sewage treatment plant by combining a microwave density meter

Abstract

The present invention relates to the technical field of sewage treatment, and in particular to a method for regulating the operation process of a sewage treatment plant in combination with a microwave density meter. An electric water inlet valve is opened to allow sewage to enter a biochemical pool. After the sewage is treated in the biochemical pool, an electric valve is opened to transport the treated sewage in the biochemical pool to a secondary sedimentation tank. The sewage passes through a transport pipeline, and a microwave density meter is used to detect the solid content of the sewage in the pipeline using the principle of microwave reflection. The data detected by the microwave density meter is transmitted back to a control system, and the data is entered for analysis. The mud level state of the secondary sedimentation tank is obtained through curvature calculation. The method for regulating the operation process of a sewage treatment plant in combination with a microwave density meter adopts a microwave density meter as a detection source, and uses microwaves to measure the concentration, so that the mud level of the secondary sedimentation tank can be detected more conveniently. It is also equipped with water pressure and flow rate detection to assist the microwave density meter in data comparison, thereby improving the detection accuracy of the sludge level in the secondary sedimentation tank.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for regulating the operation process of a sewage treatment plant in combination with a microwave densitometer. Background Art

[0002] At present, in the sewage treatment process, a sludge interface meter is used to detect the mud level in the secondary sedimentation tank. Conventional sludge interface meters detect the sludge interface in an ultrasonic way. The sludge interface meter sensor emits a beam of ultrasonic waves, which is reflected by the mud layer at the bottom of the pool. The sensor calculates the mud level by monitoring the echo intensity and echo time. This method fixes the sludge interface meter at a certain position on the pool wall for detection. The results of this detection method are easily interfered with, and the measurement range is small, which cannot reflect the current mud level status as a whole. The sludge discharge control system controlled by this has major shortcomings in terms of precision control such as response speed and control ability, and thus cannot make timely adjustments and adjustments for the next step of process operation in a good and accurate manner;

[0003] Manually use a rod or light source combined with a knot to detect the mud level in the secondary sedimentation tank. Use a longer rod to extend into the sludge bucket, and measure the length after touching the bottom to determine the mud level. Or use a light bulb connected to the knot to sink it, and calculate the length of the knot after the light source is completely invisible, so as to determine the mud level. This manual measurement method is greatly affected by the weather. It is almost impossible to measure during the day or in rainy and snowy weather, and the accuracy is very low, which cannot achieve the purpose of guiding production.

[0004] The existing system mainly controls the sludge return ratio by adjusting the return ratio according to the concentration of the return sludge and mixed liquor. This calculation method is only suitable for low-load processes, that is, when the suspended solids in the influent are not high. Otherwise, errors will occur compared with the actual situation, making it difficult to accurately grasp the production in real time. Summary of the invention

[0005] The object of the present invention is to provide a method for regulating the operation process of a sewage treatment plant in combination with a microwave densitometer, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for regulating the operation process of a sewage treatment plant in combination with a microwave densitometer, comprising the following steps:

[0007] Step 1: Open the electric water inlet valve to allow the sewage to enter the biochemical pool, where the sewage is treated;

[0008] Step 2: Open the electric valve to transport the treated sewage in the biochemical pool to the secondary sedimentation tank. The sewage passes through the transportation pipeline, and the microwave density meter uses the principle of microwave reflection to detect the solid content of the sewage in the transportation pipeline;

[0009] Step 3: The data detected by the microwave density meter is transmitted back to the control system, and the data is entered for analysis, and the mud level state of the secondary sedimentation tank is obtained through curvature calculation;

[0010] Step 4: After the curvature calculation in step 3, if the solid content of the sewage in the delivery pipeline is high, it means that the delivery pipeline is not smooth, and it can be known that the mud level in the secondary sedimentation tank is high;

[0011] Step 5: The density of the sewage in the delivery pipeline is detected by a pressure meter and a flow meter at the same time, the water flow velocity and water pressure in the delivery pipeline are detected, and then the density of the sewage containing solids is obtained by density calculation;

[0012] Step 6: In step 2 and step 5, the solid content of sewage in the conveying pipeline is measured by a microwave densitometer, and the density of solid matter in the conveying pipeline is calculated by flow rate and pressure. The two sets of sewage density data are compared to determine the mud level height of the secondary sedimentation tank;

[0013] Step 7: When the sludge level in the sewage of the secondary sedimentation tank is high, open an external return pump to discharge the sewage and sludge in the secondary sedimentation tank. When the sludge level in the secondary sedimentation tank drops to a normal value, close the external return valve;

[0014] The step seven also includes:

[0015] Step 7Ⅰ: When it is found that the sludge level in the secondary sedimentation tank is decreasing slowly, the control system detects the sludge level of the other secondary sedimentation tanks, opens the electric valve, and changes the water supply of each secondary sedimentation tank according to the sludge load. When the sludge level in the secondary sedimentation tank drops to the normal value, the water supply is adjusted to the preset amount;

[0016] Step 7 II: When it is found that the sludge level in the secondary sedimentation tank is still decreasing slowly, the control system controls the electric valve to reduce the water inflow of the biochemical pool with a higher sludge level in the secondary sedimentation tank. When the sludge level returns to normal, the return pump and the water inflow of the biochemical pool are reset;

[0017] In the step seven, after opening the external return valve, the pressure inside the pipeline is increased by a pressure-boosting device, so that the sewage and sludge inside the pipeline can be transported out more quickly.

[0018] In a further embodiment, the microwave densitometer in step 2 is installed on a pipeline for conveying sewage, and the microwave densitometer is also installed on a pipeline of an external reflux pump.

[0019] In a further embodiment, the microwave densitometer is composed of a microwave transmitter and a microwave receiver, and the microwave transmitter and the microwave receiver are relatively installed on the outside of the conveying pipeline.

[0020] In a further embodiment, the microwave transmitter and the microwave receiver utilize the microwave transmitter to transmit a microwave signal, and the microwave signal penetrates the transmission pipeline and is emitted to the opposite microwave receiver. The microwave receiver receives the microwave signal and calculates the solid content of the sewage passing through the medium based on the time from the emission to the reception of the microwave, thereby facilitating the detection of the solid content of the sewage.

[0021] In a further embodiment, the boosting device is installed on the delivery pipeline of the external reflux pump, and the boosting device uses compressed air to increase the return delivery speed of the secondary sedimentation tank with a higher sludge level, thereby increasing the sludge processing and discharge speed.

[0022] In a further embodiment, in step three, the data collected by the microwave density meter is uploaded to the control system in real time, and the instrument is automatically operated and maintained, providing relevant operation and maintenance prompts and alarm pop-up windows to facilitate staff viewing.

[0023] In a further embodiment, the curvature calculation formula in step 3 is as follows:

[0024]

[0025] in, is the curvature value, is the absolute value of the y-axis, is the value of the x-axis.

[0026] In a further embodiment, the calculation formula of water density in step 6 is as follows:

[0027]

[0028] in, is the density of sewage in the pipe, in kg / m3, is the water pressure of sewage in the pipe, in Pa, is the gravitational acceleration constant, It is the sewage flow rate in the pipe, in m / s.

[0029] In a further embodiment, in step seven, after turning on the external reflux pump, the sewage in the conveying pipeline is refluxed and transported, and the refluxed sewage is monitored in real time by a microwave density meter, and at the same time, it is coordinated and controlled in real time with the microwave density meter of the secondary sedimentation tank, and the data is transmitted to the control system for data integration to ensure the system's usability connectivity.

[0030] In a further embodiment, the microwave densitometer in step 2 uses u-ICC microwaves to measure the sewage concentration in the conveying pipeline to determine the solid content in the sewage, thereby facilitating the determination of the solid content in the sewage.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention adopts a microwave density meter as a detection source and uses microwaves to measure the concentration. When microwaves pass through water-containing materials such as suspensions and pastes, water molecules have a larger dielectric constant than other solids, so they absorb microwaves particularly strongly. Due to the high sensitivity of microwaves to water, water and solids can be clearly distinguished. Compared with the commonly used sludge interface meter, the instrument has higher accuracy and stronger anti-interference and anti-impact capabilities. It is also more convenient to use, and there is no need to place the equipment inside the sedimentation tank, so more efficient and convenient detection can be achieved.

[0033] 2. The present invention provides a second set of pressure and flow detection instruments to assist the microwave density meter, calculates the sewage density by using the pressure and flow of the sewage, and compares and calculates the density data with the microwave detection data to obtain a more accurate sludge value, so that the subsequent sludge return treatment inside the secondary sedimentation tank is more accurate, ensuring higher efficiency of sewage treatment, and reducing the workload of personnel. The staff does not need to go to the side of the secondary sedimentation tank for manual measurement, ensuring the safety of the personnel, and adopting the microwave density meter and pressure and flow detection for measurement, which reduces the workload and improves the safety of work;

[0034] 3. In the present invention, the system uses calculation to generate a decision tree, conducts intelligent joint adjustment and control of feedback data, and intelligent management. It automatically calculates the sludge return ratio according to the curvature to achieve accurate real-time online control, thereby greatly improving operational management efficiency, liberating productivity, and improving production efficiency. The data collected by the microwave density meter is uploaded to the system in real time, and the instrument is automatically operated and maintained, providing relevant operation and maintenance prompts and alarm pop-up windows. The system makes a response decision in an instant according to the curvature calculation, adjusts the sludge return ratio in real time, reduces the subsequent sludge load pressure, and provides orderly guarantee for the stable and continuous operation of the water plant;

[0035] 4. In the present invention, when the external reflux pump is turned on, the conveying pipe conveys the sludge inside the secondary sedimentation tank to the outside. At this time, compressed air is used to increase the pressure in the conveying pipe. The pressurized conveying of the conveying pipe can effectively increase the speed of sludge being conveyed outward in the conveying pipe, increase the speed of reducing the mud level in the secondary sedimentation tank, and prevent the conveying pipe from being blocked by mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a control flow chart of sewage treatment of the present invention;

[0037] Figure 2 It is a flow chart of sewage treatment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the sewage treatment of the present invention;

[0039] Figure 4It is a schematic diagram of the structure of the transmission pipeline and the microwave densitometer of the present invention.

[0040] In the figure: 1. Electric water inlet valve; 2. Biochemical pool; 3. Electric valve; 4. Secondary sedimentation tank; 5. Microwave density meter; 6. External reflux pump; 7. Delivery pipeline; 8. Microwave transmitter; 9. Microwave receiver. DETAILED DESCRIPTION

[0041] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0042] See also Figure 1-4 This embodiment provides a method for regulating the operation process of a sewage treatment plant by combining a microwave densitometer, comprising the following steps:

[0043] Step 1: Open the electric water inlet valve to allow the sewage to enter the biochemical pool, where the sewage is treated;

[0044] Step 2: Open the electric valve to transport the treated sewage in the biochemical pool to the secondary sedimentation tank. The sewage passes through the conveying pipeline, and the microwave density meter uses the principle of microwave reflection to detect the solid content of the sewage in the conveying pipeline. The microwave density meter controls the mud level in the secondary sedimentation tank. Compared with the traditional detection method, the overall system has stronger anti-interference and anti-impact capabilities and higher accuracy.

[0045] Step 3: The data detected by the microwave density meter is transmitted back to the control system and entered for analysis. The mud level status of the secondary sedimentation tank is obtained through curvature calculation. After the curvature calculation, the decision tree of the system is generated. The overall operation system adopts the decision tree algorithm to integrate and process the data fed back by the microwave density meter to realize intelligent joint adjustment and control, centralized data management, decentralized control, and intelligent decision-making.

[0046] Step 4: After the curvature calculation in step 3, if the solid content in the sewage in the conveying pipeline is high, it means that the conveying pipeline is not smooth, and it can be known that the mud level of the secondary sedimentation tank is high. By quickly calculating the sludge level of the secondary sedimentation tank, it is convenient for the staff to quickly identify whether the secondary sedimentation tank needs to be refluxed;

[0047] Step 5: The density of sewage in the delivery pipeline is tested by a pressure gauge and a flow meter at the same time to detect the water flow velocity and water pressure in the delivery pipeline. Then, the density of solid matter in the sewage is obtained by density calculation. By adding auxiliary detection, further data support is provided for the main microwave density meter detection, thereby improving the detection accuracy of sewage treatment.

[0048] Step 6: In step 2 and step 5, the solid content of sewage in the conveying pipeline is measured by a microwave density meter, and the density of solid matter in the conveying pipeline is calculated by flow rate and pressure. The two sets of sewage density data are compared to judge the mud level height of the secondary sedimentation tank. By detecting and comparing the two sets of data, it is reflected whether there is a large detection error, to prevent unnecessary sewage treatment operations, and to ensure that the treatment of the mud level in the secondary sedimentation tank is more accurate and efficient;

[0049] Step 7: When the sludge level in the sewage of the secondary sedimentation tank is high, an external return pump is opened to discharge the sewage and sludge in the secondary sedimentation tank. When the sludge level in the secondary sedimentation tank drops to a normal value, the external return valve is closed;

[0050] The step seven also includes:

[0051] Step 7Ⅰ: When it is found that the sludge level in the secondary sedimentation tank is decreasing slowly, the control system detects the sludge level of the other secondary sedimentation tanks, opens the electric valve, and changes the water supply of each secondary sedimentation tank according to the sludge load. When the sludge level in the secondary sedimentation tank drops to the normal value, the water supply is adjusted to the preset amount;

[0052] Step 7 II, when it is found that the sludge level in the secondary sedimentation tank is still decreasing slowly, the control system controls the electric valve to reduce the water inflow to the biochemical pool with a higher sludge level in the secondary sedimentation tank. When the sludge level returns to normal, the water inflow to the return pump and the biochemical pool can be reset. The decision tree solution generated by the system is used to regulate the secondary sedimentation tank in real time according to the actual operation and sewage discharge status, so as to ensure that the secondary sedimentation tank is more efficient in conveying sludge, quickly discharge the sludge in the secondary sedimentation tank, and prevent the conveying pipeline from being blocked.

[0053] Step seven, after opening the external return valve, the pressure inside the pipeline is increased through the boosting equipment, so that the sewage and sludge inside the conveying pipeline can be transported outward more quickly. The boosting equipment is installed on the conveying pipeline of the external return pump. The boosting equipment uses compressed air to increase the return conveying speed of the secondary sedimentation tank with a higher sludge level, and increases the pressure inside the conveying pipeline through compressed air, thereby improving the return efficiency of sewage treatment, preventing blockage in the conveying pipeline, and improving the sewage discharge efficiency of the secondary sedimentation tank. Example

[0054] See also Figure 3-4 , further improvements were made on the basis of Example 1:

[0055] The microwave densitometer in step 2 is installed on the pipeline for conveying sewage, and the microwave densitometer is also installed on the pipeline of the external reflux pump. The microwave densitometer consists of a microwave transmitter and a microwave receiver. The microwave transmitter and the microwave receiver are relatively installed on the outside of the conveying pipeline. The microwave transmitter transmits a microwave signal, and the microwave signal penetrates the conveying pipeline and is emitted to the opposite microwave receiver. The microwave receiver receives the microwave signal and calculates the solid content of the sewage passing through the medium according to the time from microwave emission to reception.

[0056] The microwave density meter adopts a structure installed outside the conveying pipeline. It does not need to be installed in the secondary sedimentation tank. The microwave penetrates the pipeline medium. At the same time, the microwave sets a fixed emission speed. According to the time difference between microwave emission and reception, the density of the sewage in the pipeline, that is, the sewage content, is obtained. Through microwave detection data, according to the increase in the sludge content of the sewage, it means that the sludge level in the secondary sedimentation tank is high, and the sludge needs to be processed and discharged in time. The discharged sludge is then further dried. Under the condition of effective regulation of sludge reflux, based on the precise control of the sludge discharge volume, the optimized system can effectively shorten the operating time of the sludge pump and the sludge dewatering machine, thereby reducing the operating time of the desludge equipment, with high sludge production efficiency, effectively reducing energy consumption, greatly improving the operating efficiency of the dewatering machine, and thus reducing the equipment failure rate. Example

[0057] See also Figure 3 , further improvements were made on the basis of Example 1:

[0058] Step three, the data collected by the microwave density meter is uploaded to the control system in real time, the instrument is automatically controlled and maintained, and relevant operation and maintenance prompts and alarm pop-ups are provided. Step seven, after turning on the external return pump, the sewage in the conveying pipeline is returned and transported, and the returned sewage is monitored in real time by the microwave density meter. At the same time, it is coordinated and controlled in real time with the microwave density meter in the secondary sedimentation tank, and the data is transmitted to the control system for data integration. The microwave density meters in the secondary sedimentation tank and the return water pipeline are interconnected to collect and detect data, and the data is transmitted to the control system. At the same time, the microwave density meter is automatically controlled and maintained, and relevant operation and maintenance prompts and alarm pop-ups are provided. The system makes instantaneous response decisions based on curvature calculations, adjusts the sludge return ratio in real time, reduces the subsequent sludge load pressure, and improves the management of the sewage treatment plant to be more convenient and efficient.

[0059] The microwave densitometer in step 2 uses u-ICC microwave to measure the sewage concentration in the conveying pipeline, determine the solid content in the sewage, detect RSS value, MLSS, etc., and intelligently control the return flow rate through calculation to control the mud level in the secondary sedimentation tank. At the same time, according to the u-ICC detection of RSS value, MLSS, etc., it intelligently determines whether the secondary sedimentation tank to return system is normal, where MLSS represents the sludge concentration, and RSS value is the value of simple information aggregation. The numerical calculation formula of MLSS is as follows:

[0060]

[0061] in, It means the total amount of sludge and filter paper minus the weight of filter paper to get the dry weight of sludge; is a unit conversion factor used to convert dry weight of sludge from grams to milligrams; Indicates the volume of sludge taken, usually in milliliters. Example

[0062] See also Figure 1-3 , further improvements were made on the basis of Example 1:

[0063] The curvature calculation formula in step 3 is as follows:

[0064]

[0065] in, is the curvature value, is the absolute value of the y-axis, is the value of the x-axis, and the curvature is. The data detected by the microwave density meter is imported into the control system to generate a curvature graph, and then the accurate visual value of the curvature is calculated according to the above formula, which is convenient for manual and quick checking whether there is a problem of increased mud level in the secondary sedimentation tank.

[0066] The calculation formula for water density in step 6 is as follows:

[0067]

[0068] in, is the density of sewage in the pipe, is the water pressure of sewage in the pipe, is the gravitational acceleration constant, is the flow rate of sewage in the pipeline, pressure refers to the force of water flow on the inner wall of the pipeline, the unit is Pascal, density refers to the density of water, the unit is kg / cubic meter, gravity acceleration refers to the acceleration of gravity, the unit is m / s2, flow velocity refers to the speed of water flow, the unit is m / s. The density of sewage is calculated using water pressure and flow velocity, and the pollution content of sewage is judged according to the density. The data is compared and judged with the data calculated by the microwave density meter to ensure that the error in judging the mud level inside the secondary sedimentation tank is reduced, thereby better regulating sewage treatment and reducing unnecessary waste of resources.

[0069] When in use, sewage enters the biochemical pool 2 through the electric water inlet valve 1 and the conveying pipe 7. After the treatment of the biochemical pool 2 is completed, the sewage enters the secondary sedimentation tank 4 through the electric valve 3 and the conveying pipe 7. At this time, the microwave density meter 5 uses microwaves to detect the solid content in the pipeline. During the detection, the microwave transmitter 8 sends a signal, and the signal is sent to the microwave receiver 9 through the microwave transmitter 8 of the conveying pipe 7. When the medium passes through the sensor cavity, the microwave density meter 5 transmits the data of the microwave detection back to the control system according to the time from the microwave transmitter 8 to the microwave receiver 9, and enters and analyzes it. The solid content of the sludge passing through the conveying pipe 7 is calculated by curvature, and the mud level of the secondary sedimentation tank 4 is judged. At the same time, the pressure gauge and flow meter installed on the conveying pipe 7 obtain the solid content of the sludge. The water pressure and flow rate of the water are used to calculate the density of the sewage, and the density data is compared and judged in the control system with the data calculated by the microwave density meter 5 to determine the error value between the two. If the error is too large, it is necessary to perform detection and calculation again to finally obtain more accurate data. According to the above calculation, when the density in the conveying pipeline 7 is large, it means that the mud concentration in the sewage is large, which means that the mud level inside the secondary sedimentation tank 4 is high. It is judged that the pipeline is not smooth. At this time, the external return pump 6 is turned on, and the return sludge is monitored and calculated in real time through the microwave density meter 5, and the microwave density meter 5 installed on the conveying pipeline 7 of the first four secondary sedimentation tanks 4 is connected and controlled, and data is integrated, so as to realize intelligent adjustment of the mud level of each secondary sedimentation tank 4;

[0070] If it is detected that the pipeline is blocked and the solid content increases, it is calculated that the mud level in the secondary sedimentation tank 4 increases, then the control system center controls to open an external return pump 6, and the external return pump 6 transports the sludge inside the secondary sedimentation tank 4 to the outside. When the mud level drops rapidly to a normal value, the external return pump 6 can be closed. If the mud level in the secondary sedimentation tank 4 still drops slowly through the above-mentioned sewage discharge means, the control system center continues to detect the mud level status of the remaining secondary sedimentation tanks 4, and the microwave density meter 5 controls to open the electric valve 3, and changes according to the sludge load of each secondary sedimentation tank 4. The water distribution amount of each secondary sedimentation tank 4 is changed. After the water distribution amount of each secondary sedimentation tank 4 is changed, the sludge in the secondary sedimentation tank 4 is diluted and dispersed. At this time, if the mud level drops rapidly to a normal value, the water distribution of each secondary sedimentation tank 4 can be adjusted back to its original position. However, after the water distribution amount of each secondary sedimentation tank 4 is changed, the mud level of the secondary sedimentation tank 4 still drops slowly. Then, the control system center calculates and controls the water distribution to reduce the water inlet of the biochemical pool 2 with a higher mud level in the secondary sedimentation tank 4. After the mud level of each secondary sedimentation tank 4 returns to normal, the external reflux pump 6 is closed, and the water inlet of the secondary sedimentation tank 4 is restored to a preset state.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for regulating the operation process of a sewage treatment plant in combination with a microwave densitometer, characterized in that: The following steps are involved: Step 1: Open the electric water inlet valve to allow the sewage to enter the biochemical pool, where the sewage is treated; Step 2: Open the electric valve to transport the treated sewage in the biochemical pool to the secondary sedimentation tank. The sewage passes through the transportation pipeline, and the microwave density meter uses the principle of microwave reflection to detect the solid content of the sewage in the transportation pipeline; Step 3: The data detected by the microwave density meter is transmitted back to the control system, and the data is entered for analysis, and the mud level state of the secondary sedimentation tank is obtained through curvature calculation; Step 4: After the curvature calculation in step 3, if the solid content of the sewage in the delivery pipeline is high, it means that the delivery pipeline is not smooth, and it can be known that the mud level in the secondary sedimentation tank is high; Step 5: The density of the sewage in the delivery pipeline is detected by a pressure meter and a flow meter at the same time, the water flow velocity and water pressure in the delivery pipeline are detected, and then the density of the sewage containing solids is obtained by density calculation; Step 6: In step 2 and step 5, the solid content of sewage in the delivery pipeline is measured by a microwave densitometer, and the density of solid matter in sewage in the delivery pipeline is calculated by flow rate and pressure, and the two sets of sewage density data are compared to determine the mud level height of the secondary sedimentation tank; Step 7: When the sludge level in the sewage of the secondary sedimentation tank is high, open an external return pump to discharge the sewage and sludge in the secondary sedimentation tank. When the sludge level in the secondary sedimentation tank drops to a normal value, close the external return valve; The step seven also includes: Step 7Ⅰ: When it is found that the sludge level in the secondary sedimentation tank is decreasing slowly, the control system detects the sludge level of the other secondary sedimentation tanks, opens the electric valve, and changes the water supply of each secondary sedimentation tank according to the sludge load. When the sludge level in the secondary sedimentation tank drops to the normal value, the water supply is adjusted to the preset amount; Step 7 II: When it is found that the sludge level in the secondary sedimentation tank is still decreasing slowly, the control system controls the electric valve to reduce the water inflow of the biochemical pool with a higher sludge level in the secondary sedimentation tank. When the sludge level returns to normal, the return pump and the water inflow of the biochemical pool are reset; In the step seven, after opening the external return valve, the pressure inside the pipeline is increased by a pressure-boosting device, so that the sewage and sludge inside the pipeline can be transported out more quickly.

2. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: The microwave densitometer in step 2 is installed on the pipeline for conveying sewage, and the microwave densitometer is also installed on the pipeline of the external reflux pump.

3. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 2, characterized in that: The microwave density meter consists of a microwave transmitter and a microwave receiver, and the microwave transmitter and the microwave receiver are relatively installed on the outside of the conveying pipeline.

4. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 3 is characterized in that: The microwave transmitter and the microwave receiver utilize the microwave transmitter to transmit microwave signals, and the microwave signals penetrate the transmission pipeline and are emitted to the opposite microwave receiver. The microwave receiver receives the microwave signals and calculates the solid content of the sewage passing through the medium according to the time from microwave emission to reception.

5. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: The booster device is installed on the delivery pipeline of the external reflux pump, and the booster device uses compressed air to increase the reflux delivery speed of the secondary sedimentation tank with a higher sludge level.

6. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: In the step three, the data collected by the microwave density meter is uploaded to the control system in real time, and the instrument is automatically operated and maintained, providing relevant operation and maintenance prompts and alarm pop-up windows.

7. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: The curvature calculation formula in step 3 is as follows: in, is the curvature value, is the absolute value of the y-axis, is the value of the x-axis.

8. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: The calculation formula of water density in step 6 is as follows: in, is the density of sewage in the pipe, in kg / m3, is the water pressure of sewage in the pipe, in Pa, is the gravitational acceleration constant, It is the sewage flow rate in the pipe, in m / s.

9. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: In the step seven, after turning on the external reflux pump, the sewage in the conveying pipeline is refluxed and transported, and the refluxed sewage is monitored in real time by a microwave density meter, and at the same time, it is coordinated and controlled in real time with the microwave density meter of the secondary sedimentation tank, and the data is transmitted to the control system for data integration.

10. The method for controlling the operation process of a sewage treatment plant in combination with a microwave densitometer according to claim 1, characterized in that: The microwave densitometer in step 2 uses u-ICC microwaves to measure the sewage concentration in the conveying pipeline to determine the solid content in the sewage.

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