Municipal sewage on-line grading purification treatment device and method

Abstract

The application discloses a municipal sewage online grading purification treatment device and method, relates to the field of wastewater multistage treatment, and comprises a multistage biochemical treatment tank, a conveying pipeline assembly and a mixing pipeline unit, wherein the mixing pipeline unit is used for shunting or dilution and distribution of sewage according to water inlet concentration, grading and buffering of the water inlet concentration are realized, independent mixing pipeline units and resource distribution modules are arranged, sewage is switched to normal flow channels or mixed dilution flow channels according to real-time data of concentration monitoring sensors, required dilution water quantity is calculated, the design of reuse water priority, clean water supply as auxiliary and throttling discharge bottom-up is used, the opening degrees of electromagnetic valves are controlled, the flow closed-loop feedback of a reflux pump frequency converter is introduced, the accuracy of mixing proportion is ensured, and waste of dilution unevenness or medicaments caused by flow fluctuation is avoided.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment, and in particular to an online graded purification treatment device and method for municipal wastewater. Background Technology

[0002] With the acceleration of urbanization, industrial wastewater, catering waste liquid or initial rainwater often mix into municipal drainage pipe networks, causing drastic fluctuations in the water quality entering sewage treatment plants, especially the short-term phenomenon of extremely high concentrations of COD and ammonia nitrogen.

[0003] Existing technologies for online graded purification of municipal wastewater have poor resistance to shock loads. Activated sludge multi-stage biological treatment tanks have strict tolerance ranges for influent concentrations. When high-concentration abnormal wastewater rushes in instantly, it can directly lead to microbial poisoning or activity inhibition, causing sludge bulking, a long recovery period, and seriously affecting the effluent compliance rate.

[0004] Furthermore, traditional equalization tanks rely solely on gravity settling and long-term homogenization. For sudden high-concentration wastewater, simply extending the retention time cannot reduce the total amount of pollutants, resulting in low dilution efficiency.

[0005] Existing technologies cannot calculate and adjust the dilution water volume in real time based on the influent concentration. When faced with insufficient water supply or carbon-nitrogen imbalance, they cannot dynamically control the amount of returned sewage and clean water replenishment, which can easily lead to hydraulic overload.

[0006] Therefore, we propose an online graded purification treatment device and method for municipal sewage to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide an online graded purification treatment device and method for municipal wastewater to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an online graded purification and treatment device for municipal wastewater, comprising:

[0009] Multi-stage biological treatment ponds are used for the biological purification of municipal sewage.

[0010] A mixed pipeline unit, which is connected to a multi-stage biological treatment tank, is used to divert or dilute wastewater according to the influent concentration;

[0011] The hybrid piping unit includes:

[0012] The delivery pipeline assembly includes an inlet pipe, an inlet solenoid valve, and an outlet solenoid valve, wherein a concentration monitoring sensor is installed at the inlet pipe;

[0013] A mixing piping assembly, comprising a branch pipe, a filter, a mixing pipe, a mixing delivery pipe, and a return pipe connected in sequence;

[0014] The diversion pipe is connected to the inlet pipe, and the mixing pipe is connected to the return water storage tank and the emergency storage well through the storage pipe.

[0015] Preferably, it also includes a resource allocation module for receiving signals from the concentration monitoring sensor and controlling the opening degree of the inlet solenoid valve, the outlet solenoid valve, and the valve on the storage tube.

[0016] Preferably, the hybrid piping assembly further includes:

[0017] The pre-mixing solenoid valve is installed between the filter and the mixing pipe;

[0018] The post-mixing solenoid valve is installed between the storage pipe and the mixing pipe;

[0019] The temporary storage solenoid valve is installed between the storage pipe and the return water storage tank;

[0020] An emergency discharge valve is installed between the storage pipe and the emergency storage well;

[0021] The resource allocation module adjusts the mixing ratio of sewage and return water by controlling the opening and closing of the pre-mixing solenoid valve, post-mixing solenoid valve, temporary storage solenoid valve, and emergency discharge valve.

[0022] Preferably, the multi-stage biochemical treatment tank is equipped with a level gauge and an online water quality monitor. The signal output terminals of the level gauge and the concentration monitoring sensor are connected to the resource allocation module. The resource allocation module is configured to adjust the influent flow rate according to the level of the multi-stage biochemical treatment tank and the feedback of the effluent water quality.

[0023] A method for using an online graded purification and treatment device for municipal wastewater includes the following steps:

[0024] S1 Online Monitoring and Grading Determination: The concentration of wastewater in the inlet pipe is monitored in real time by a concentration monitoring sensor, and the wastewater concentration is compared with the preset abnormal concentration threshold.

[0025] S2 Normal Operating Condition Processing: If the wastewater concentration is less than the abnormal concentration threshold, open the inlet solenoid valve and the outlet solenoid valve to introduce the wastewater into the multi-stage biological treatment tank.

[0026] S3 Abnormal Dilution: If the wastewater concentration is greater than the abnormal concentration threshold, close the outlet solenoid valve, open the pre-mixing solenoid valve, introduce the abnormal wastewater into the mixing pipe, and start the resource allocation module to calculate the required dilution water volume.

[0027] S4 Mixing: The resource allocation module controls the temporary storage solenoid valve and the post-mixing solenoid valve to introduce return water and abnormal sewage to mix in the mixing pipe. After mixing, the mixture enters the multi-stage biological treatment tank through the mixing conveying pipe.

[0028] Preferably, the mixing process in step S4 specifically includes:

[0029] Prioritize Return Water: The resource allocation module queries the available water volume in the return water storage tank. If the available water volume meets the dilution requirements, return water is extracted and mixed according to the calculated ratio.

[0030] Clean water supply: If the return water is insufficient, calculate the water shortage, open the clean water supply valve, and introduce external clean water for replenishment and mixing;

[0031] Throttling and storage: If the total amount of return water and external clean water is insufficient, the resource allocation module issues a throttling command to close the inlet solenoid valve to reduce the inlet water flow and to temporarily store the excess untreated abnormal sewage through the emergency discharge valve into the emergency storage well.

[0032] Preferably, the return water priority step also includes closed-loop control of the return flow rate:

[0033] Start the return pump and adjust the frequency converter to monitor the deviation between the actual return flow rate and the target flow rate in real time;

[0034] If the deviation is greater than the preset threshold, the frequency of the return pump will be adjusted according to feedback until the flow rate matches.

[0035] When the water volume in the return water tank is insufficient, the amount of return water produced by pretreatment in the future period is estimated. If the predicted return water volume can cover the gap, the influent flow rate is reduced, and the return water is mixed after it is generated.

[0036] Preferably, it also includes a dynamic feedback adjustment step:

[0037] Real-time monitoring of carbon-nitrogen ratio and liquid level in multi-stage biochemical treatment tanks;

[0038] If the carbon-to-nitrogen ratio is higher than the set threshold, reduce the amount of fresh water replenishment or increase the amount of return water to reduce the organic load in the influent;

[0039] If the liquid level in the multi-stage biological treatment tank exceeds the warning value, reduce the opening of the inlet solenoid valve and decrease the influent flow rate.

[0040] Preferably, it also includes a process for utilizing the storage wells:

[0041] When the emergency storage well is full or / and the multi-stage biochemical treatment tank is under load, the high-concentration wastewater in the emergency storage well is used as a carbon source and transported to the mixing pipe via a bypass pump. It is then mixed and diluted with excess return water before being treated.

[0042] Preferably, based on the abnormal dilution triggering in step S3, it also includes source linkage control:

[0043] The resource allocation module sends a linkage signal to the upstream pumping station to slow down or cut off the source supply of abnormal sewage, limiting the total amount of abnormal sewage entering the system to only the residual amount in the pipeline network.

[0044] The technical effects and advantages of this invention are as follows:

[0045] 1. It achieves graded and buffered influent concentration. By setting up independent mixing pipeline units and resource allocation modules, and based on real-time data from concentration monitoring sensors, it switches sewage to normal flow channels or mixing and dilution flow channels, transforming passive acceptance into an active control mechanism. This effectively isolates the impact of high-concentration sewage on the core multi-stage biochemical treatment tank and ensures the stability of the microbial system.

[0046] 2. By calculating the required dilution water volume and based on the design of prioritizing recycled water, supplementing with clean water, and ensuring a bottom-line of throttling discharge, the opening degree of each solenoid valve is controlled. Furthermore, the flow closed-loop feedback of the return pump frequency converter is introduced to ensure the accuracy of the mixing ratio and avoid uneven dilution or waste of reagents caused by flow fluctuations.

[0047] 3. By setting up emergency storage wells and supporting disposal logic, the problem of insufficient recycled water and clean water was solved. High-concentration sewage that cannot be treated in time is temporarily stored and reused as a carbon source when the load allows, thus preventing environmental pollution.

[0048] 4. By setting up water quality monitoring and carbon-nitrogen ratio feedback in the multi-stage biological treatment tank, the ratio of clean water to return water is dynamically adjusted, avoiding the problems of carbon source deficiency or excessive organic load caused by excessive dilution, maintaining the working conditions of the biological reaction and reducing aeration energy consumption. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the hybrid pipeline unit structure of the present invention;

[0051] Figure 3 This is a schematic diagram of the conveying pipeline assembly structure of the present invention;

[0052] Figure 4 This is a schematic diagram of the hybrid pipeline assembly structure of the present invention;

[0053] Figure 5 This is a schematic diagram of the multi-stage biochemical treatment tank structure of the present invention;

[0054] Figure 6 This is a flowchart of the method of using the present invention;

[0055] Figure 7 This is a flowchart of the abnormal response process of the present invention;

[0056] Figure 8 This is a flowchart illustrating the dynamic control of reflux water volume in this invention.

[0057] Figure 9 This is a flowchart illustrating the control of reflux water volume and pretreatment reflux water volume in this invention.

[0058] Figure 10 This is a flowchart of the water supply control process of the present invention;

[0059] Figure 11 This is a flowchart of the upstream throttling control process of the present invention;

[0060] Figure 12 This is a flowchart of the load and storage capacity verification process of the present invention.

[0061] In the diagram: 1. Multi-stage biochemical treatment tank; 2. Mixing pipeline unit; 21. Inlet pipe; 211. Inlet solenoid valve; 212. Outlet solenoid valve; 22. Diverter pipe; 23. Filter; 231. Pre-mixing solenoid valve; 24. Mixing pipe; 241. Post-mixing solenoid valve; 25. Mixing delivery pipe; 251. Mixing port solenoid valve; 26. Storage pipe; 261. Temporary storage solenoid valve; 27. Return pipe. Detailed Implementation

[0062] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0063] This invention provides, for example Figures 1-12 The municipal wastewater online graded purification treatment device and method shown includes a multi-stage biological treatment tank 1 and a mixing pipeline unit 2 connected to the multi-stage biological treatment tank 1.

[0064] The multi-stage biological treatment tank 1 has a built-in microbial treatment system and is equipped with a level gauge and an online water quality monitoring instrument to monitor the liquid level and effluent quality in the tank in real time. The system is also equipped with an online carbon-nitrogen ratio analyzer to provide real-time feedback on the organic load status of the biological treatment tank.

[0065] Hybrid piping unit 2 includes a delivery piping assembly and a hybrid piping assembly;

[0066] The conveying pipeline assembly consists of an inlet pipe 21, an inlet solenoid valve 211, and an outlet solenoid valve 212.

[0067] The imported solenoid valve 211 is installed below the inlet pipe 21 and is connected to the municipal sewage inlet pipe. It is used to receive water from the upstream pipe network and control the flow rate of sewage into the inlet pipe 21 by the opening degree of the imported solenoid valve 211.

[0068] The outlet solenoid valve 212 is installed at the upper end of the inlet pipe 21, and the inlet pipe 21 is connected to the multi-stage biochemical treatment tank 1 through the outlet solenoid valve 212.

[0069] An online concentration monitoring sensor, such as an ultraviolet absorption spectrometer or a COD rapid analyzer, is installed inside the inlet pipe 21 or at the flange interface to collect the influent pollution load in real time. When the concentration is within the set range, the inlet solenoid valve 211 and the outlet solenoid valve 212 are opened to allow the sewage in the municipal sewage pipeline to enter the multi-stage biological treatment tank 1 through the inlet solenoid valve 211, the inlet pipe 21 and the outlet solenoid valve 212 for normal purification treatment.

[0070] The mixing pipeline assembly consists of a diversion pipe 22, a filter 23, a mixing pipe 24, a mixing conveying pipe 25, a storage pipe 26, and a return pipe 27. The diversion pipe 22 is connected to the inlet pipe 21. The diversion pipe 22 can be configured with multiple outlets, which can be used to convey wastewater with different abnormal concentration ranges to the designated multi-stage biological treatment tank 1 through the conveying pipe.

[0071] The filter 23 is connected to the inlet pipe 21 through an outlet on the diversion pipe 22 to receive municipal sewage. A pre-mixing solenoid valve 231 is installed between the filter 23 and the mixing pipe 24. A concentration monitoring sensor is installed in the inlet pipe 21. When an abnormal concentration occurs, the sewage cannot be treated in the multi-stage biological treatment tank 1. The pre-mixing solenoid valve 231 is opened, and the inlet solenoid valve 211 is opened and the outlet solenoid valve 212 is closed, so that the sewage in the municipal sewage pipe enters the mixing pipe 24. The inflow rate of sewage is controlled by controlling the opening degree of the pre-mixing solenoid valve 231.

[0072] The mixing pipe 24 adopts a static mixer or venturi tube structure, which uses fluid kinetic energy to achieve turbulent mixing of sewage and return water, ensuring that the water quality entering the multi-stage biological treatment tank 1 is uniform.

[0073] A temporary storage solenoid valve 261 is also installed on the storage pipe 26. The temporary storage solenoid valve 261 is used to connect the storage pipe 26 to the treated return water storage tank. The temporary storage solenoid valve 261 is used to allow the return water to enter the mixing pipe 24 through the storage pipe 26 and the post-mixing solenoid valve 241, so as to achieve the mixing of return water and sewage. The opening degree of the post-mixing solenoid valve 241 is used to control the flow rate of return water and adjust the mixing ratio of return water and sewage.

[0074] After the return water and sewage are mixed in the mixing pipe 24, they are transported to the multi-stage biological treatment tank 1 through the mixing conveying pipe 25 and the mixing port solenoid valve 251 connected to the mixing pipe 24. The sewage is treated, and the total inflow rate into the multi-stage biological treatment tank 1 can be controlled by the opening of the mixing port solenoid valve 251 to avoid the hydraulic load in the multi-stage biological treatment tank 1 from exceeding the limit.

[0075] A post-mixing solenoid valve 241 is installed between the storage pipe 26 and the mixing pipe 24. The storage solenoid valve 261 works in conjunction with the post-mixing solenoid valve 241 to precisely control the proportion of reflux dilution water.

[0076] The return pipe 27 is connected to the storage pipe 26 and the storage well. The return pipe 27 is used to allow untreated abnormal sewage to enter the storage pipe 26 through the mixing pipe 24 and the post-mixing solenoid valve 241, and to close the temporary storage solenoid valve 261, and to enter the storage well through the return pipe 27 for temporary storage.

[0077] All of the above valves have proportional adjustment functions, which can control the flow rate and volume of sewage entering the inlet pipe 21 by adjusting the opening degree.

[0078] It also includes a central intelligent control system, which comprises a resource allocation module, a flow closed-loop control module, and a source linkage module.

[0079] The resource allocation module receives data from the sensors and calculates the dilution ratio, valve opening degree, and pump frequency based on a preset algorithm.

[0080] The flow closed-loop control module monitors the deviation between the actual flow and the target flow in real time and adjusts the frequency converter and valves accordingly.

[0081] The source linkage module communicates with upstream pumping stations or pipeline valves to achieve source flow regulation.

[0082] A method for online graded purification and treatment of municipal wastewater includes the following steps:

[0083] S1 Online Monitoring and Grading Determination: The concentration of sewage in the inlet pipe 21 is monitored in real time by a concentration monitoring sensor, and the sewage concentration is compared with the preset abnormal concentration threshold.

[0084] S2 Normal operating condition treatment: If the sewage concentration is less than the abnormal concentration threshold, open the inlet solenoid valve 211 and the outlet solenoid valve 212 to introduce the sewage into the multi-stage biological treatment tank 1.

[0085] S3 Abnormal Dilution: If the wastewater concentration is greater than the abnormal concentration threshold, close the outlet solenoid valve 212, open the pre-mixing solenoid valve 231, introduce the abnormal wastewater into the mixing pipe 24, and start the resource allocation module to calculate the required dilution water volume.

[0086] S4 Mixing: The resource allocation module controls the temporary storage solenoid valve 261 and the post-mixing solenoid valve 241 to introduce return water and abnormal sewage to mix in the mixing pipe 24. After mixing, the mixture enters the multi-stage biological treatment tank 1 through the mixing conveying pipe 25.

[0087] The specific implementation of online monitoring and classification judgment based on S1 and normal operating condition treatment based on S2 includes real-time monitoring of the wastewater concentration in the inlet pipe 21 through a concentration monitoring sensor to determine the concentration of abnormal substances.

[0088] When the concentration of abnormal substances is not greater than the threshold, normal process is carried out, that is, the wastewater is transported into the multi-stage biological treatment tank 1 through the pipeline assembly for normal wastewater treatment.

[0089] Based on step S3 abnormal dilution, when the concentration of abnormal substances is greater than the threshold, wastewater dilution treatment is carried out, that is, the wastewater is mixed with return water and / or clean water through the mixing pipeline assembly to achieve dilution of the concentration of abnormal substances in the wastewater. The ratio of wastewater to return water and / or clean water is calculated and allocated through dilution water volume calculation and distribution, and the ratio is distributed for pre-mixing dilution.

[0090] Specifically disclosed is the water volume calculation and allocation, which can regulate the sewage flow, clean water supply and return water volume through upstream flow regulation, so that it enters the conveying pipeline assembly for mixing, and the mixed and diluted sewage enters the multi-stage biological treatment tank 1. By monitoring the water level of the multi-stage biological treatment tank 1, the dilution treatment storage capacity can be monitored to determine whether it exceeds the standard.

[0091] Furthermore, when the standard is exceeded, it is necessary to recalculate the dilution water volume, re-control its flow transmission, and re-regulate the sewage flow, clean water replenishment, and return water volume until the dilution treatment storage capacity does not exceed the standard and the inflow and treatment flow reach a balance to ensure continuous treatment.

[0092] Furthermore, when no exceedance occurs, the treatment efficiency of the multi-stage biological treatment tank 1 is assessed to determine whether it falls within the threshold range. If the treatment efficiency is within a suitable threshold range, the current operation can be maintained. If the treatment efficiency is not within a suitable threshold range, resource allocation is readjusted, namely, adjusting the sewage flow control, clean water replenishment control, and return water volume control, and implementing throttling ratio control. The dilution water volume is then recalculated and allocated for premixing and dilution.

[0093] Specifically disclosed, when monitoring is performed at the front end of the delivery pipeline assembly and an abnormal wastewater target concentration is detected, the abnormal wastewater target concentration is transmitted to the resource allocation module. The resource allocation module receives the abnormal wastewater target concentration, obtains the current influent flow rate data, calculates the required total dilution water volume, and obtains the available return water volume according to the proportion.

[0094] Based on the abnormal dilution triggering in step S3, source linkage control is also included:

[0095] The resource allocation module sends a linkage signal to the upstream pumping station or pipeline valve to slow down or cut off the source supply of abnormal sewage, limiting the total amount of abnormal sewage entering the system to only the residual amount in the pipeline.

[0096] Specifically, when abnormal sewage is detected, feedback is given in advance, and the upstream source drainage channel is closed to prevent the continuous generation of abnormal sewage. The subsequent dilution treatment of abnormal sewage is to dilute the residual sewage in the upstream pipeline, and the amount of abnormal sewage is limited.

[0097] The resource allocation module immediately sends a signal to the upstream pumping station through the source linkage module to slow down or cut off the source supply of abnormal sewage.

[0098] The specific steps of mixing and blending in step S4 include:

[0099] Prioritize Return Water: The resource allocation module queries the available water volume in the return water storage tank. If the available water volume meets the dilution requirements, return water is extracted and mixed according to the calculated ratio.

[0100] Clean water supply: If the return water is insufficient, calculate the water shortage, open the clean water supply valve, and introduce external clean water for replenishment and mixing;

[0101] Throttling and storage: If the total amount of return water and external clean water is insufficient, the resource allocation module issues a throttling command to close the inlet solenoid valve 211 to reduce the inlet water flow, and directs the excess untreated abnormal sewage into the emergency storage well for temporary storage through the emergency discharge valve.

[0102] Furthermore, it is necessary to determine in advance whether the return water flow rate on that day is greater than the required dilution water volume, so as to meet the dilution treatment of abnormal sewage.

[0103] Furthermore, if the return water flow rate on that day is sufficient to dilute the abnormal sewage, the return water volume is allocated, and the data is transmitted to the resource allocation module to calculate the ratio of water flow rate and sewage flow rate. By controlling the opening of the corresponding solenoid valve, the installation ratio is controlled for mixing.

[0104] If the daily return water flow cannot meet the required dilution water volume, the maximum return water volume is allocated, and the clear water gap is calculated to determine whether the clear water volume is sufficient to dilute the remaining difference. If the clear water volume can meet the requirement, the clear water volume is allocated, and the maximum return water volume and allocated clear water volume data are sent to the resource allocation module to perform proportional calculations on the water flow rate, sewage flow rate and clear water flow rate. By controlling the opening of the corresponding solenoid valve, the installation ratio is controlled for mixing.

[0105] Furthermore, when the amount of clean water is insufficient to meet the dilution difference of the sewage, the optimal amount of clean water is allocated, and the sewage is throttled. The excess sewage is discharged into a temporary storage well for further treatment, so as to complete the treatment of abnormal sewage and restore the upstream transport of municipal sewage. The maximum return water volume and the optimal clean water volume data are transmitted to the resource allocation module to calculate the ratio of water flow, sewage flow and clean water flow. By controlling the opening of the corresponding solenoid valve, the installation ratio is controlled for mixing. After mixing is completed, the solenoid valve is closed or opened accordingly, and the remaining abnormal sewage is transported to the storage well.

[0106] The return water priority step also includes closed-loop control of the return flow rate:

[0107] Start the return pump and adjust the frequency converter to monitor the deviation between the actual return flow rate and the target flow rate in real time;

[0108] If the deviation is greater than the preset threshold, the frequency of the return pump will be adjusted according to feedback until the flow rate matches.

[0109] When the water volume in the return water tank is insufficient, the amount of return water produced by pretreatment in the future period is estimated. If the predicted return water volume can cover the gap, the influent flow rate is reduced, and the return water is mixed after it is generated.

[0110] Specifically, when the resource allocation module receives the return water volume instruction, the current liquid level of the return water tank is obtained, and it is determined whether the return water tank flow rate is greater than the required dilution water volume. When the return water tank flow rate meets the required dilution water volume, the return pump frequency converter is adjusted to start, and the return water of the target flow rate is extracted and mixed with the abnormal sewage.

[0111] Furthermore, during the return water delivery, the actual flow rate of the return water is monitored in real time, and the actual flow rate is compared with the target flow rate. If the deviation is less than the preset deviation threshold, feedback needs to be sent to the return pump frequency converter to readjust its pumping rate; if it is less than the deviation threshold, the liquid level in the return water tank is continuously monitored.

[0112] Furthermore, by monitoring the return water flow rate, when the return water flow rate is less than the required dilution water volume, the return water is continuously extracted and the data is fed back to the resource allocation module; when the return water flow rate is less than the required dilution water volume, the return water volume is reduced to a safe value and a return water volume insufficient signal is sent to the resource allocation module to recalculate and allocate the dilution water volume to meet the dilution of abnormal sewage.

[0113] Specifically, when the flow rate of the return water tank cannot meet the required dilution water volume, it is necessary to estimate the amount of pretreated wastewater completed on that day, calculate the amount of return water generated after treatment based on its normal treatment rate, and determine whether the amount of return water is greater than the difference in the required dilution water volume.

[0114] Furthermore, when the flow rate of the return water generated after the pretreatment of wastewater is greater than the difference in the required dilution water volume, a signal indicating sufficient return water volume is sent. Based on the efficiency of wastewater treatment into return water, the flow rate of abnormal wastewater upstream is adjusted to ensure that the subsequently generated return water can be mixed synchronously with the abnormal wastewater. This data is then transmitted to the resource allocation module for corresponding regulation.

[0115] Furthermore, when the return water flow rate generated after pretreatment is less than the difference in required dilution water volume, the return water volume is reduced to a safe value, a return water volume insufficient signal is sent, and the dilution water volume is recalculated and allocated to meet the dilution of abnormal wastewater.

[0116] Specifically disclosed, when the flow rate of the return water tank cannot meet the required dilution water volume, it is necessary to dilute and mix the return water generated from the pre-treated sewage on the same day with the abnormal sewage. The upstream sewage inflow is adjusted according to the sewage treatment efficiency, the throttling ratio instruction from the resource allocation module is received, the throttling flow is calculated, and the opening of the abnormal sewage valve is adjusted, thereby adjusting the sewage throttling valve opening to the target opening.

[0117] Furthermore, the influent concentration is monitored in real time. By comparing the influent concentration with the preset concentration threshold range, when an abnormal wastewater concentration changes and the actual influent concentration exceeds the previously set reference wastewater concentration threshold range, the throttling ratio is reduced. The ratio is adjusted through the resource allocation module to readjust the upstream flow and prevent the mixed wastewater concentration from being too high, thus failing to meet the dilution requirements.

[0118] When the actual influent concentration of abnormal wastewater is less than the previously set reference wastewater concentration threshold range, the current valve opening is maintained to ensure the mixing rate meets the standard. The liquid level of the multi-stage biological treatment tank 1 is monitored in real time to determine whether the liquid level exceeds the warning value. If the warning value is exceeded, the throttling ratio is reduced, and the ratio is adjusted through the resource allocation module to readjust the upstream flow and prevent excessive liquid in the treatment liquid, which would prevent normal treatment. When the liquid level does not exceed the warning value, the current setting is maintained, and operation continues.

[0119] It is particularly important to note that when the return water volume is insufficient to dilute abnormal sewage, or when the COD concentration of the return water is greater than the preset threshold, the resource allocation module will receive a clean water replenishment command if at least one of the above conditions is met.

[0120] It also includes dynamic feedback adjustment steps:

[0121] Real-time monitoring of the carbon-nitrogen ratio and liquid level in multi-stage biological treatment tank 1;

[0122] If the carbon-to-nitrogen ratio is higher than the set threshold, reduce the amount of fresh water replenishment or increase the amount of return water to reduce the organic load in the influent;

[0123] If the liquid level in the multi-stage biological treatment tank 1 exceeds the warning value, reduce the opening of the inlet solenoid valve 211 to reduce the influent flow rate.

[0124] Furthermore, the specific control involves adjusting the opening of the clean water valve to the target flow rate. The opening is determined by the ratio of the opening of the abnormal sewage valve to the opening of the return water flow rate. The actual clean water flow rate is monitored in real time. When the deviation between the actual flow rate and the target flow rate exceeds the threshold, the opening of the clean water valve is readjusted to control the actual flow rate to match the target flow rate.

[0125] When the deviation between the actual flow rate and the target flow rate is less than the threshold, the actual flow rate matches the target flow rate. This can achieve the ratio of the sewage valve and the return water volume, effectively diluting abnormal sewage to a suitable concentration. The carbon-nitrogen ratio of the multi-stage biological treatment tank 1 is continuously monitored. When the carbon-nitrogen ratio is lower than the set threshold, it continues to operate without affecting the treatment of the mixed sewage.

[0126] When the carbon-nitrogen ratio is greater than the set threshold, in order to avoid the wastewater concentration after mixing and dilution being too high and affecting the treatment efficiency, the amount of clean water replenishment is reduced, thereby reducing the carbon-nitrogen ratio. The clean water replenishment restriction signal is sent to the resource allocation module, and the dilution water volume is recalculated and allocated to meet the dilution of abnormal wastewater.

[0127] Real-time monitoring of the carbon-nitrogen ratio of the influent to the multi-stage biological treatment tank 1. If the carbon-nitrogen ratio is too low, reduce the supply of clean water appropriately and utilize the carbon source from the raw water. If the carbon-nitrogen ratio is too high, increase the aeration rate or reduce the influent load.

[0128] It also includes the disposal steps for the storage wells:

[0129] When the emergency storage well is full or / and the multi-stage biological treatment tank 1 has sufficient load, the high-concentration wastewater in the emergency storage well is used as a carbon source and pumped in small, continuous amounts to the mixing pipe 24 via a bypass pump. After being mixed and diluted with excess return water, it is then sent to the multi-stage biological treatment tank 1 for treatment.

[0130] When the emergency storage well reaches a high level, switch to low load mode and use the high-concentration sewage in the storage well as a carbon source. In small amounts, continuously pump it back to the mixing pipe 24 through the bypass pump, and use the plant's return water for dilution and treatment until it is emptied.

[0131] By acquiring the operation parameters of each controlled flow, the total inflow is calculated, and it is determined whether the total inflow is less than the treatment flow threshold. If it is not less than the treatment flow threshold, a water load over-limit signal is sent to the resource allocation module for parameter adjustment.

[0132] When the flow rate is less than the processing threshold, calculate the organic load and determine whether the organic load is less than the set threshold. If it is not less than the set threshold, send an organic load over-limit signal to the resource allocation module for parameter adjustment.

[0133] When the level is less than the set threshold, the liquid level of the multi-stage biochemical treatment tank 1 is obtained. It is determined whether the liquid level of the multi-stage biochemical treatment tank 1 is less than the warning threshold. If it is not less than the warning threshold of the liquid level of the multi-stage biochemical treatment tank 1, an over-limit signal of the liquid level of the multi-stage biochemical treatment tank 1 is sent to the resource allocation module for parameter adjustment.

[0134] When the liquid level is below the warning threshold of the multi-stage biochemical treatment tank 1, the liquid level of the return water tank is obtained. It is then determined whether the liquid level of the return water tank is greater than the required dilution threshold. An insufficient return water volume signal is sent to the resource allocation module for parameter adjustment.

[0135] When all the above conditions are met, the security check passes and the system operates normally.

[0136] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A municipal wastewater online graded purification and treatment device, characterized in that, include: A multi-stage biochemical treatment tank (1) is used for the biochemical purification of municipal sewage; The mixing pipeline unit (2) is connected to the multi-stage biological treatment tank (1) and is used to divert or dilute the sewage according to the influent concentration. The hybrid piping unit (2) includes: The delivery pipeline assembly includes an inlet pipe (21), an inlet solenoid valve (211), and an outlet solenoid valve (212), wherein a concentration monitoring sensor is provided at the inlet pipe (21); The mixing pipeline assembly includes a branch pipe (22), a filter (23), a mixing pipe (24), a mixing delivery pipe (25), and a return pipe (27) connected in sequence. Among them, the diversion pipe (22) is connected to the inlet pipe (21), and the mixing pipe (24) is connected to the return water storage tank and the emergency storage well through the storage pipe (26).

2. The municipal wastewater online graded purification and treatment device according to claim 1, characterized in that, It also includes a resource allocation module for receiving signals from the concentration monitoring sensor and controlling the opening degree of the valves on the inlet solenoid valve (211), outlet solenoid valve (212) and storage tube (26).

3. The municipal wastewater online graded purification and treatment device according to claim 1, characterized in that, The hybrid piping assembly also includes: A pre-mixing solenoid valve (231) is installed between the filter (23) and the mixing pipe (24); A post-mixing solenoid valve (241) is installed between the storage pipe (26) and the mixing pipe (24); A temporary storage solenoid valve (261) is installed between the storage pipe (26) and the return water storage tank; An emergency discharge valve is installed between the storage pipe (26) and the emergency storage well; The resource allocation module adjusts the mixing ratio of sewage and return water by controlling the opening and closing of the pre-mixing solenoid valve (231), the post-mixing solenoid valve (241), the temporary storage solenoid valve (261), and the emergency discharge valve.

4. The municipal wastewater online graded purification and treatment device according to claim 1, characterized in that, The multi-stage biochemical treatment tank (1) is equipped with a level gauge and an online water quality monitoring instrument. The signal output terminals of the level gauge and the concentration monitoring sensor are connected to the resource allocation module. The resource allocation module is configured to adjust the influent flow rate according to the level of the multi-stage biochemical treatment tank (1) and the feedback of the effluent water quality.

5. A method of using an online graded purification and treatment device for municipal wastewater, based on the online graded purification and treatment device for municipal wastewater according to any one of claims 1-4, characterized in that, Includes the following steps: S1 Online monitoring and classification judgment: The concentration of sewage in the inlet pipe (21) is monitored in real time by a concentration monitoring sensor, and the sewage concentration is compared with the preset abnormal concentration threshold. S2 Normal operating condition treatment: If the sewage concentration is less than the abnormal concentration threshold, open the inlet solenoid valve (211) and the outlet solenoid valve (212) to introduce the sewage into the multi-stage biological treatment tank (1). S3 Abnormal Dilution: If the wastewater concentration is greater than the abnormal concentration threshold, close the outlet solenoid valve (212), open the pre-mixing solenoid valve (231), introduce the abnormal wastewater into the mixing pipe (24), and start the resource allocation module to calculate the required dilution water volume; S4 Mixing: The resource allocation module controls the temporary storage solenoid valve (261) and the post-mixing solenoid valve (241) to introduce return water and abnormal sewage to mix in the mixing pipe (24). After mixing, the mixture enters the multi-stage biochemical treatment tank (1) through the mixing conveying pipe (25).

6. The method of using the online graded purification and treatment device for municipal sewage according to claim 5, characterized in that, The specific steps of mixing and blending in step S4 include: Prioritize Return Water: The resource allocation module queries the available water volume in the return water storage tank. If the available water volume meets the dilution requirements, return water is extracted and mixed according to the calculated ratio. Clean water supply: If the return water is insufficient, calculate the water shortage, open the clean water supply valve, and introduce external clean water for replenishment and mixing; Throttling storage: If the total amount of return water and external clean water is insufficient, the resource allocation module issues a throttling command to close the inlet solenoid valve (211) to reduce the inlet flow rate, and to temporarily store the excess untreated abnormal sewage through the emergency discharge valve into the emergency storage well.

7. The method of using the online graded purification and treatment device for municipal sewage according to claim 6, characterized in that, The return water priority step also includes closed-loop control of the return flow rate: Start the return pump and adjust the frequency converter to monitor the deviation between the actual return flow rate and the target flow rate in real time; If the deviation is greater than the preset threshold, the frequency of the return pump will be adjusted according to feedback until the flow rate matches. When the water volume in the return water tank is insufficient, the amount of return water produced by pretreatment in the future period is estimated. If the predicted return water volume can cover the gap, the influent flow rate is reduced, and the return water is mixed after it is generated.

8. The method of using the online graded purification and treatment device for municipal sewage according to claim 5, characterized in that, It also includes dynamic feedback adjustment steps: Real-time monitoring of the carbon-nitrogen ratio and liquid level in the multi-stage biochemical treatment tank (1); If the carbon-to-nitrogen ratio is higher than the set threshold, reduce the amount of fresh water replenishment or increase the amount of return water to reduce the organic load in the influent; When the liquid level in the multi-stage biochemical treatment tank (1) exceeds the warning value, the opening degree of the inlet solenoid valve (211) is reduced to decrease the inlet water flow.

9. The method of using the online graded purification and treatment device for municipal sewage according to claim 5, characterized in that, It also includes the disposal steps for the storage wells: When the emergency storage well is full or / and the multi-stage biochemical treatment tank (1) is under load, the high-concentration sewage in the emergency storage well is used as a carbon source and transported to the mixing pipe (24) through a bypass pump. It is then mixed and diluted with excess return water before being treated.

10. The method of using the online graded purification and treatment device for municipal sewage according to claim 5, characterized in that, Based on the abnormal dilution triggering in step S3, source linkage control is also included: The resource allocation module sends a linkage signal to the upstream pumping station to slow down or cut off the source supply of abnormal sewage, limiting the total amount of abnormal sewage entering the system to only the residual amount in the pipeline network.

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