System and method for controlling optimized addition of carbon source based on lateral flow sludge hydrolysis and MABR coupling

Abstract

The invention relates to a carbon source addition optimization control system and method based on a sidestream sludge hydrolysis and MABR coupling technology, and belongs to the technical field of sewage treatment and environmental protection. According to the system, on the basis of a multi-stage AO process, an MABR membrane assembly is arranged in a first anoxic zone, a side flow sludge hydrolysis tank is arranged in front of an anaerobic process section, and on-line monitoring and a PLC control system are combined, so that sludge hydrolysis is accurately controlled to supplement a carbon source in the system and reduce the addition of exogenous carbon; the system comprises an on-line monitoring system, a carbon source feeding system, a sludge external reflux system, a sludge internal reflux system and a PLC control system, and through real-time monitoring and automatic regulation, the feeding amount of the carbon source is optimized, the denitrification effect is improved, and the material consumption cost of the carbon source and carbon emission are reduced; the method realizes efficient utilization of a carbon source, energy conservation and emission reduction, ensures stability and high efficiency of a sewage treatment process, provides powerful technical support for water environment protection, has wide applicability and extremely high popularization and application values, and contributes to environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment and environmental protection, and in particular to a carbon source optimization dosing control system and method based on side stream sludge hydrolysis and MABR coupling. Background Art

[0002] In the field of sewage treatment, the addition of carbon sources is one of the key factors in controlling the removal efficiency of pollutants such as nitrogen and phosphorus. Traditional sewage treatment processes, such as multi-stage AO (Anaerobic-Oxic) processes, usually rely on the addition of external carbon sources to maintain efficient denitrification effects. However, this dependence not only increases the operating costs of sewage treatment plants, but may also lead to increased effluent COD (Chemical Oxygen Demand) due to excessive use of carbon sources, increased carbon emission intensity of sewage treatment plants, and secondary pollution to the environment. In addition, traditional processes often lack precise control in the addition of carbon sources, resulting in inefficient carbon source utilization, further exacerbating the problem of resource waste and rising operating costs.

[0003] In order to optimize carbon source addition, improve denitrification efficiency and reduce operating costs, researchers have begun to explore new wastewater treatment processes that combine sludge hydrolysis technology with multi-stage AO processes in recent years. Sludge hydrolysis technology controls the sludge residence time and environmental conditions to promote the hydrolysis of organic matter in the sludge into small molecule organic carbon sources, thereby providing an endogenous carbon source for the biological denitrification process. This technology can not only reduce dependence on external carbon sources, but also achieve sludge reduction and resource utilization to a certain extent.

[0004] At the same time, MABR (Membrane Aerated Biofilm Reactor), as an emerging biological treatment technology, has attracted much attention because it can achieve simultaneous SND (Simultaneous Nitrification and Denitrification). MABR uses bubble-free aeration technology to directly provide oxygen to the biofilm layer through the membrane component without the need for mixed liquid reflux, thereby simplifying the process and improving the utilization efficiency of oxygen. In MABR, nitrifying bacteria and denitrifying bacteria can coexist and interact in the same space to achieve efficient nitrogen removal.

[0005] However, the current technology of coupling sludge hydrolysis technology with MABR for wastewater treatment is not yet mature, especially in the optimization and control of carbon source addition. How to accurately control the sludge hydrolysis process to provide a stable endogenous carbon source, how to dynamically adjust the carbon source dosage according to water quality changes to maximize denitrification efficiency, these problems need to be solved urgently.

[0006] In summary, the existing technology has deficiencies in the optimization and control of carbon source addition, and there is an urgent need for a new sewage treatment process that can accurately control the sludge hydrolysis process and optimize the carbon source addition amount. Based on this demand, the present invention proposes a carbon source addition optimization control system based on the side stream sludge hydrolysis + MABR coupling process, which aims to improve the denitrification efficiency and reduce the operating cost by accurately controlling the sludge hydrolysis and carbon source addition, so as to achieve efficient, energy-saving and environmentally friendly operation of the sewage treatment process. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a carbon source optimization dosing control system and method based on side stream sludge hydrolysis and MABR coupling, so as to solve the problems of large carbon source dosage, high cost, poor denitrification effect and high carbon emission intensity in traditional sewage treatment processes.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling, comprising: The side stream sludge hydrolysis tank, the anaerobic tank, the first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank and the secondary sedimentation tank are connected in sequence; The MABR membrane assembly is arranged in the front section of the first anoxic tank; An online monitoring system, including an inlet flow meter, internal sludge concentration monitoring sampling points of the first anoxic tank and the second anoxic tank, inlet and outlet water quality monitoring sampling points, and internal water quality monitoring points of the side stream sludge hydrolysis tank, for real-time monitoring of the operating status of the system; The carbon source dosing system includes a drug storage tank, a dosing pump and a dosing control valve of the first anoxic tank and the second anoxic tank, which are connected to a PLC (Programmable Logic Controller) central control system through a control signal line, and receive control signals to perform carbon source dosing; The sludge external return system and the internal return system, including the internal return pump, the external return pump, the side stream sludge return pump and the corresponding flow meters and control valves, are connected to the PLC central control system through the second signal line to receive the control signal to adjust the sludge return; The PLC central control system is used to receive signals from the online monitoring system, analyze the system operating status according to the preset optimization control method, and automatically adjust the operating status of the sludge return system and the carbon source addition system to achieve optimized control of carbon source addition.

[0009] In a preferred solution, the online monitoring system includes: An inlet water flow meter is used to monitor the process inlet water flow in real time, and is connected to the PLC central control system through a first signal line; The sludge concentration monitoring sampling point uses a small sampling pump to take samples regularly, and uses a sludge concentration analyzer to analyze the sludge concentration, and then transmits the results to the PLC central control system; At the water quality monitoring sampling point, samples are taken regularly using a small sampling pump, and the COD, ammonia nitrogen and total nitrogen indicators of the samples are analyzed using a water quality detection analyzer, and the results are transmitted to the PLC central control system.

[0010] In a preferred solution, the online monitoring system includes: The carbon source adding system comprises: A medicine storage tank, used to store carbon sources; The dosing pumps and dosing control valves of the first anoxic tank and the second anoxic tank respectively receive control signals from the PLC central control system through the second signal line to perform precise dosing of the carbon source.

[0011] In the preferred scheme, the sludge external reflow system and the internal reflow system include: an internal reflow pump, an external reflow pump and a side stream sludge reflow pump, which are respectively equipped with a flow meter and a control valve, and receive control signals from the PLC central control system through a control signal line to adjust the sludge reflow flow rate.

[0012] In a preferred embodiment, the PLC central control system can automatically analyze the system operating status according to the received signal, and based on a preset optimization control method, achieve optimized control of carbon source addition by adjusting the operating status of the sludge return system and the carbon source addition system.

[0013] In the preferred solution, the PLC central control system also has an intelligent early warning function. Once abnormal water quality parameters are detected, it will immediately trigger an alarm and automatically adjust the process parameters to ensure a stable and efficient sewage treatment process, providing strong technical support for water environment protection.

[0014] The carbon source optimization dosing control method based on side stream sludge hydrolysis and MABR coupling adopts any one of the above-mentioned carbon source optimization dosing control systems based on side stream sludge hydrolysis and MABR coupling, and the method comprises the following steps: Step 1: Calculate the C / N ratio based on the COD and total nitrogen influent data of the first anoxic tank as a feedforward parameter, and adjust the sludge external return system or jointly adjust the sludge return system and the carbon source addition system based on the C / N ratio; Step 2: When only the sludge return system is adjusted, the side stream sludge return amount is calculated based on the carbon source optimization control model, and the sludge return is adjusted to supplement the carbon source; Step 3: When the sludge return system and the carbon source addition system are adjusted at the same time, the carbon source addition amount is calculated based on the carbon source optimization control model, and the carbon source addition is supplemented to achieve total nitrogen removal; Step 4: According to the calculation results, the carbon source dosage and sludge circulation volume are adjusted through the PLC central control system to achieve accurate addition and control of the carbon source; Step 5: By comprehensively monitoring the system operating status, adjust the internal reflux and external reflux operations, optimize the system denitrification effect, and reduce the system operating costs.

[0015] In the preferred scheme, when Step 2 only adjusts the sludge return system, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank sludge concentration online monitoring data, based on the carbon source optimization control model, calculate the side stream sludge return amount, and adjust the return amount in detail and accurately by adjusting the sludge return. The calculation formula is as follows: (1) in, is the sludge return flow rate of the side stream sludge hydrolysis tank, L / s; is the COD concentration of the side stream sludge hydrolysis tank, mg / L; is the TN concentration of the influent of the first anoxic tank, mg / L; TN design standard for effluent from the biochemical system, mg / L; is the COD concentration of the influent of the first anoxic tank, mg / L; is the effluent COD concentration of the second anoxic pool, mg / L; is the TN reduction factor in the pool; Ammonia nitrogen concentration in the effluent from the second anoxic pool, mg / L.

[0016] In the preferred scheme, when the sludge return system and the carbon source addition system are adjusted simultaneously in Step 3, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank sludge concentration online monitoring data, based on the carbon source optimization control model, calculate the addition amount of the carbon source addition system, the side stream sludge runs at the set maximum flow rate, and the total nitrogen removal is achieved by supplementing the carbon source addition. The calculation formula is as follows: (2) in, is the carbon source dosage of the first anoxic pool, kgCOD / L; is the carbon source dosage of the second anoxic tank, kg / L.

[0017] The carbon source optimization dosing control system and method based on side stream sludge hydrolysis and MABR coupling provided by the present invention have the following beneficial effects: 1. The present invention solves the problems of large carbon source dosage, high cost and poor denitrification effect in traditional sewage treatment processes; 2. The present invention couples the MABR component with the side stream sludge hydrolysis tank on the basis of the original multi-stage AO, and adopts the mode of segmented replenishment of the internal carbon source to achieve the optimal utilization of the internal carbon source and reduce the addition of the carbon source; 3. The present invention realizes the simultaneous nitrification and denitrification through the MABR membrane module, and no carbon source is required for normal operation, thus reducing the amount of carbon source used; 4. The side stream sludge hydrolysis tank of the present invention can add carbon source to the system by hydrolyzing the sludge in the system, thereby reducing the utilization of carbon source; 5. The present invention combines and optimizes the control of carbon source addition and side stream sludge return, and reduces the carbon source consumption cost outside the sewage treatment plant through simple and easy operation; 6. The present invention achieves optimal utilization of internal carbon sources and significantly reduces the amount of exogenous carbon added by coupling the side stream sludge hydrolysis process and MABR membrane technology; 7. The present invention adopts a segmented replenishment method to provide optimized carbon source dosage for the first anoxic pool and the second anoxic pool, respectively, to effectively improve the denitrification effect of the biochemical pool; 8. The present invention realizes real-time monitoring and automatic control of the system operation status through the close integration of the PLC central control system and the online monitoring system, thereby ensuring the stability and efficiency of the system operation; 9. The present invention realizes the optimized control of carbon source addition through innovative process design and intelligent control system, reduces the operating cost of sewage treatment, improves the treatment effect, reduces the carbon emission intensity of sewage treatment plants, and has important practical application value; 10. The present invention also integrates efficient sludge volume reduction technology, which significantly reduces sludge production through side stream sludge hydrolysis, further reduces the cost and pressure of sludge treatment and disposal, and promotes the sustainable development of the sewage treatment industry; 11. The PLC central control system of the present invention is also extended with intelligent early warning function. Once abnormal water quality parameters are detected, the alarm is immediately triggered and the process parameters are automatically adjusted to ensure the stability and efficiency of the sewage treatment process, providing strong technical support for water environment protection; 12. The PLC central control system of the present invention can also record and analyze data in real time, predict potential problems, and take preventive measures in advance, further improving the operational efficiency and environmental adaptability of the sewage treatment plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 A schematic diagram of an optimization control system according to an embodiment of the present invention; In the figure: PLC central control system 1, drug storage tank 2, first anoxic tank dosing pump 3, first anoxic tank dosing control valve 4, second anoxic tank dosing pump 5, second anoxic tank dosing control valve 6, sludge concentration analyzer 7, water quality detection analyzer 8, water inlet flow meter 9, internal return flow meter 10, internal return pump 11, internal return control valve 12, external return flow meter 13, external return pump 14, external return control valve 15, side stream sludge return flow meter 16, side stream sludge return pump 17, side stream sludge control valve 18, first anoxic tank water inlet Sampling point 19 for water quality monitoring, sampling point 20 for monitoring sludge concentration inside the first anoxic tank, sampling point 21 for monitoring effluent water quality from the first anoxic tank, sampling point 22 for monitoring influent water quality from the second anoxic tank, sampling point 23 for monitoring sludge concentration inside the second anoxic tank, sampling point 24 for monitoring effluent water quality from the second anoxic tank, second signal line 25, mud and water sampling pipeline 26, water quality sampling pipeline 27, first signal line 28, dosing pipeline 29, sludge circulation pipeline 30, sewage treatment process pipeline 31, sampling point 32 for monitoring water quality inside the side stream sludge hydrolysis tank. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figure 1 As shown, the carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling includes: The side stream sludge hydrolysis tank, the anaerobic tank, the first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank and the secondary sedimentation tank are connected in sequence; The MABR membrane assembly is arranged in the front section of the first anoxic tank; The online monitoring system includes an inlet flow meter 9, internal sludge concentration monitoring sampling points of the first anoxic tank and the second anoxic tank, inlet and outlet water quality monitoring sampling points, and internal water quality monitoring points of the side stream sludge hydrolysis tank, which are used to monitor the operating status of the system in real time; The carbon source dosing system includes a drug storage tank 2, a dosing pump and a dosing control valve of the first anoxic tank and the second anoxic tank, which are connected to the PLC central control system 1 through a control signal line and receive a control signal to dosing the carbon source; The sludge external return system and the internal return system, including the internal return pump 11, the external return pump 14, the side stream sludge return pump 17 and their corresponding flow meters and control valves, are connected to the PLC central control system 1 through the second signal line 25 to receive control signals to adjust the sludge return; The PLC central control system 1 is used to receive signals from the online monitoring system, analyze the system operation status according to a preset optimization control method, and automatically adjust the operation status of the sludge return system and the carbon source addition system to achieve optimized control of carbon source addition.

[0020] In this embodiment, the online monitoring system includes: The water inlet flow meter 9 is used to monitor the process water inlet flow in real time, and is connected to the PLC central control system 1 through the first signal line 28; The sludge concentration monitoring sampling point uses a small sampling pump to take samples regularly, and uses a sludge concentration analyzer 7 to analyze the sludge concentration, and then transmits the results to the PLC central control system 1; At the water quality monitoring sampling point, samples are taken regularly by a small sampling pump, and the COD, ammonia nitrogen and total nitrogen indicators of the samples are analyzed by a water quality detection analyzer 8, and the results are transmitted to the PLC central control system 1.

[0021] Furthermore, the online monitoring system comprises: The carbon source adding system comprises: Medicine storage tank 2, used for storing carbon source; The dosing pumps and dosing control valves of the first anoxic tank and the second anoxic tank respectively receive control signals from the PLC central control system 1 through the second signal line 25 to perform accurate dosing of the carbon source.

[0022] Furthermore, the sludge external reflow system and the internal reflow system include: an internal reflow pump 11, an external reflow pump 14 and a side stream sludge reflow pump 17, which are respectively equipped with flow meters and control valves, receive control signals from the PLC central control system 1 through control signal lines, and adjust the sludge reflow flow rate.

[0023] Furthermore, the PLC central control system 1 can automatically analyze the system operating status according to the received signal, and based on the preset optimization control method, achieve the optimization control of carbon source addition by adjusting the operating status of the sludge return system and the carbon source addition system.

[0024] Furthermore, the PLC central control system 1 also has an intelligent early warning function. Once abnormal water quality parameters are detected, an alarm is immediately triggered and process parameters are automatically adjusted to ensure a stable and efficient sewage treatment process, providing strong technical support for water environment protection.

[0025] Example 2 In another preferred embodiment, based on the above embodiment 1, the carbon source optimization dosing control method based on side stream sludge hydrolysis and MABR coupling adopts any one of the above-mentioned carbon source optimization dosing control systems based on side stream sludge hydrolysis and MABR coupling, and the method comprises the following steps: Step 1: Calculate the C / N ratio based on the COD and total nitrogen influent data of the first anoxic tank as a feedforward parameter, and adjust the sludge external return system or jointly adjust the sludge return system and the carbon source addition system based on the C / N ratio; Step 2: When only the sludge return system is adjusted, the side stream sludge return amount is calculated based on the carbon source optimization control model, and the sludge return is adjusted to supplement the carbon source; Step 3: When the sludge return system and the carbon source addition system are adjusted at the same time, the carbon source addition amount is calculated based on the carbon source optimization control model, and the carbon source addition is supplemented to achieve total nitrogen removal; Step 4: According to the calculation results, the carbon source dosage and sludge circulation volume are adjusted through the PLC central control system (1) to achieve accurate addition and control of the carbon source; Step 5: By comprehensively monitoring the system operating status, adjust the internal reflux and external reflux operations, optimize the system denitrification effect, and reduce the system operating costs.

[0026] Furthermore, when Step 2 only adjusts the sludge return system, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank sludge concentration online monitoring data, based on the carbon source optimization control model, calculate the side stream sludge return flow, and adjust the return flow in detail and accurately by adjusting the sludge return flow. The calculation formula is as follows: (1) in, is the sludge return flow rate of the side stream sludge hydrolysis tank, L / s; is the COD concentration of the side stream sludge hydrolysis tank, mg / L; is the TN concentration of the influent of the first anoxic tank, mg / L; TN design standard for effluent from the biochemical system, mg / L; is the COD concentration of the influent of the first anoxic tank, mg / L; is the effluent COD concentration of the second anoxic pool, mg / L; is the TN reduction factor in the pool; Ammonia nitrogen concentration in the effluent from the second anoxic pool, mg / L.

[0027] Furthermore, when the sludge return system and the carbon source addition system are adjusted simultaneously in Step 3, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the sludge concentration online monitoring data in the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank, and calculate the addition amount of the carbon source addition system based on the carbon source optimization control model. The side stream sludge runs at the set maximum flow rate, and the total nitrogen removal is achieved by supplementing the carbon source addition. The calculation formula is as follows: (2) in, is the carbon source dosage of the first anoxic pool, kgCOD / L; is the carbon source dosage of the second anoxic tank, kg / L.

[0028] In the figure: 1. PLC central control system; 2. Drug storage tank; 3. Dosing pump for the first anoxic tank; 4. Dosing control valve for the first anoxic tank; 5. Dosing pump for the second anoxic tank; 6. Dosing control valve for the second anoxic tank; 7. Sludge concentration analyzer; 8. Water quality detection analyzer; 9. Inlet flow meter; 10. Internal reflux flow meter; 11. Internal reflux pump; 12. Internal reflux control valve; 13. External reflux flow meter; 14. External reflux pump; 15. External reflux control valve; 16. Side stream sludge reflux flow meter; 17. Side stream sludge reflux pump; 18. Side stream sludge Control valve 19, first anoxic tank inlet water quality monitoring sampling point; 20, first anoxic tank internal sludge concentration monitoring sampling point; 21, first anoxic tank effluent water quality monitoring sampling point; 22, second anoxic tank inlet water quality monitoring sampling point; 23, second anoxic tank internal sludge concentration monitoring sampling point; 24, second anoxic tank effluent water quality monitoring sampling point; 25, second signal line; 26, mud and water sampling pipeline; 27, water quality sampling pipeline; 28, first signal line; 29, dosing pipeline; 30, sludge circulation pipeline; 31, sewage treatment process pipeline; Example 3 In another preferred embodiment, based on the above embodiments 1 and 2, as Figure 1 As shown, a carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling, the system of the present invention mainly comprises a PLC central control system 1, a drug storage tank 2, a dosing pump and a valve including a first anoxic tank dosing pump, a first anoxic tank dosing control valve 4, a second anoxic tank dosing pump 5, and a second anoxic tank dosing control valve 6, a sludge return system including an internal return pump 11, an external return pump 14, a side stream sludge return pump 17 and corresponding flow meters including an internal return flow meter 10, an external return flow meter 13, a side stream sludge return flow meter 16 and control valves including an internal return control valve 12, an external return control valve 15, and a side stream sludge control valve 18, a water quality and sludge concentration monitoring system including a water quality detection analyzer 8, The sludge concentration analyzer 7, the water inlet flow meter 9 and a plurality of monitoring sampling points include a first anoxic tank inlet water quality monitoring sampling point 19, a first anoxic tank internal sludge concentration monitoring sampling point 20, a first anoxic tank effluent water quality monitoring sampling point 21, a second anoxic tank inlet water quality monitoring sampling point 22, a second anoxic tank internal sludge concentration monitoring sampling point 23, a second anoxic tank effluent water quality monitoring sampling point 24, a side stream sludge hydrolysis tank internal water quality monitoring sampling point 32, and a side stream sludge hydrolysis tank and MABR membrane components and pipelines include a second signal line 25, a mud and water sampling pipeline 26, a water quality sampling pipeline 27, a first signal line 28, a dosing pipeline 29, a sludge circulation pipeline 30, etc. The system structure is as follows: Figure 1 shown.

[0029] The working principle of the system is as follows: 1. Water quality and sludge concentration monitoring: The system monitors water quality parameters [such as COD, ammonia nitrogen, total nitrogen (TN)] and sludge concentration (MLSS, Mixed Liquor Suspended Solids) in real time through monitoring sampling points distributed in each process section, such as the first anoxic tank inlet water quality monitoring sampling point 19, the effluent water quality monitoring sampling point 21, etc.; these data are transmitted to the corresponding analyzers, namely the water quality detection analyzer 8 and the sludge concentration analyzer 7, through the water quality sampling pipeline 27 and the muddy water sampling pipeline 26, and the analysis results are transmitted to the PLC central control system 1 through the first signal line 28.

[0030] 2. Sludge return control: The PLC central control system 1 automatically adjusts the flow rates of the internal return pump 11, the external return pump 14 and the side stream sludge return pump 17, as well as the openings of the corresponding control valves, i.e., the internal return control valve 12, the external return control valve 15 and the side stream sludge control valve 18, based on the monitored water quality and sludge concentration data, as well as the inlet flow data (provided by the inlet flow meter 9), through the built-in optimization control algorithm, so as to achieve precise control of the sludge return amount.

[0031] 3. Carbon source addition control: When the inlet C / N ratio is lower than the preset threshold, the PLC central control system 1 will simultaneously start the sludge return system and the carbon source addition system, and accurately add the carbon source by controlling the first anoxic tank dosing pump 3 and the second anoxic tank dosing pump 5, as well as the corresponding dosing control valves, i.e., the first anoxic tank dosing control valve 4 and the second anoxic tank dosing control valve 6; the addition amount is calculated according to the optimization control model, aiming to optimize the denitrification effect of the biochemical pool.

[0032] 4. Operation of MABR membrane modules: MABR membrane modules are installed in the front section of the first anoxic tank, and use their unique membrane structure to achieve simultaneous nitrification and denitrification, effectively reducing the demand for carbon sources. Their operating status is also monitored and regulated by the PLC central control system.

[0033] The specific steps are as follows: 1. System startup and initialization: First, start the PLC central control system 1, and perform self-inspection and initialization settings on each monitoring instrument, dosing pump, reflux pump and valve.

[0034] 2. Water quality and sludge concentration monitoring: Turn on the sampling pumps at each monitoring sampling point, take samples at regular intervals and transmit them to the analyzer for testing; at the same time, the water inlet flow meter 9 transmits the water inlet flow data to the PLC central control system 1 in real time.

[0035] 3. Data analysis and decision-making: The PLC central control system 1 receives and analyzes the monitoring data, and calculates the optimal values ​​of the sludge return flow and carbon source dosage according to the preset optimization control algorithm.

[0036] 4. Control execution: According to the calculation results, the operating states of the internal reflux pump, the external reflux pump, the side stream sludge reflux pump and their control valves are adjusted through the second signal line 25, and the action of the dosing pump and the dosing control valve is controlled at the same time to achieve precise control of sludge reflux and carbon source addition.

[0037] 5. Continuous optimization and adjustment: During system operation, the PLC central control system 1 continuously monitors the system operating status and dynamically adjusts the control parameters according to actual conditions to ensure that the system is always in the optimal operating state.

[0038] This system introduces side stream sludge hydrolysis and MABR coupling process to construct an intelligent carbon source dosing optimization control system. The system can accurately control sludge return and carbon source dosing to achieve optimal utilization of internal carbon sources, thereby reducing the amount of carbon source added while improving the denitrification effect and reducing carbon emissions and operating costs of sewage treatment.

[0039] In the preferred scheme, the sludge external reflow system and the internal reflow system include: an internal reflow pump 11, an external reflow pump 14 and a side stream sludge reflow pump 17, which are respectively equipped with flow meters and control valves, and receive control signals from the PLC central control system 1 through the control signal line to adjust the sludge return flow rate; the above settings realize precise control of the sludge return flow rate, effectively improving the sewage treatment efficiency and stability; at the same time, the operating data of each pump group is fed back to the PLC system in real time, which is convenient for remote monitoring and fault warning, ensuring the continuity and safety of the entire treatment process.

[0040] In the preferred scheme, the PLC central control system 1 can automatically analyze the system operation status according to the received signal, and based on the preset optimization control method, realize the optimization control of carbon source addition by adjusting the operation status of the sludge return system and the carbon source addition system; the above settings ensure the efficiency and accuracy of the sewage treatment process, reduce the waste of carbon sources, and at the same time improve the stability of effluent water quality, achieving the dual goals of energy conservation and emission reduction and environmental protection, and providing strong support for the intelligent management of sewage treatment plants.

[0041] In the preferred solution, the PLC central control system 1 also has an intelligent early warning function. Once abnormal water quality parameters are detected, an alarm is immediately triggered and the process parameters are automatically adjusted to ensure that the sewage treatment process is stable and efficient, providing strong technical support for water environment protection. The above settings not only improve the degree of automation of sewage treatment, but also significantly reduce the need for manual intervention, enhance the system's response speed and troubleshooting capabilities, and further consolidate the operating stability and reliability of environmental protection facilities.

[0042] In the preferred scheme, when Step 2 only adjusts the sludge return system, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and effluent water quality detection data, and the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank The sludge concentration online monitoring data is calculated based on the carbon source optimization control model, and the return amount of the side stream sludge is adjusted in detail and accurately by adjusting the sludge return; the above settings ensure that the sludge return system can not only meet the needs of biochemical reactions, but also avoid waste of resources caused by excessive return; at the same time, combined with real-time monitoring of water quality changes, the strategy is flexibly adjusted to improve the efficiency and stability of sewage treatment.

[0043] In the preferred scheme, when the sludge return system and the carbon source addition system are adjusted simultaneously in Step 3, the specific optimization control method is to use the biochemical pool inlet flow meter, the inlet and effluent water quality detection data of the first anoxic pool and the second anoxic pool, and the sludge concentration online monitoring data in the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis pool, and calculate the addition amount of the carbon source addition system based on the carbon source optimization control model. The side stream sludge runs at the set maximum flow rate, and total nitrogen removal is achieved by supplementing the carbon source addition. The above settings can dynamically adjust the system parameters to ensure the synergistic effect between sludge return and carbon source addition, maximize the sewage treatment efficiency and total nitrogen removal effect, and maintain the stable operation and cost control of the system.

[0044] In summary, the present invention provides a carbon source optimization dosing control system and method based on the coupling of sidestream sludge hydrolysis and MABR, which solves the problems of large carbon source dosage, high cost, high carbon emission intensity and poor denitrification effect in traditional sewage treatment processes; overcomes the defects of poor adaptability to complex water quality and insufficient control accuracy in the prior art. The system intelligently monitors the influent water quality and the operating status of the sewage treatment system, dynamically adjusts the amount of carbon source introduced into the sewage through the sidestream sludge hydrolysis and the carbon source supply in the first and second anoxic tanks, thereby realizing the precise and efficient utilization of carbon sources and significantly improving the sewage treatment efficiency and denitrification performance; the present invention is based on a multi-stage AO process, and by adding a sidestream sludge hydrolysis tank and a MABR membrane assembly, combined with an online monitoring system, a carbon source dosing system, a sludge external reflux system, an internal reflux system and a PLC control system, it realizes intelligent optimization control of carbon source dosing; the present invention realizes intelligent optimization control of carbon source dosing by combining the sidestream sludge The hydrolysis tank is set before the anaerobic process section. Through the hydrolysis of sludge, carbon sources are added to the system to reduce dependence on external carbon sources. The MABR membrane module is set before the first-stage anoxic zone to use the simultaneous nitrification and denitrification capabilities of MABR to reduce the consumption of carbon sources and improve the denitrification effect. The online monitoring system is arranged at a key position in the process system to monitor the influent flow, water quality indicators (such as COD, ammonia nitrogen, total nitrogen) and sludge concentration in real time to provide data support for optimization control. The carbon source addition system is set up according to the online monitoring data and the optimization control model to automatically adjust the The dosage of the whole carbon source is adjusted to ensure the stability and efficiency of the system operation; the sludge external reflow and internal reflow system is precisely regulated by the PLC control system to optimize the sludge return path and flow rate, and realize the internal circulation and reuse of the carbon source; the PLC control system is set as the core of the whole system, which is responsible for receiving online monitoring data, executing the optimization control algorithm, issuing control instructions, and adjusting the operating status of the sludge return system and the carbon source addition system; the present invention realizes the intelligent optimization control of carbon source addition through technological innovation and system integration, which not only significantly reduces the carbon source addition amount and operating cost of sewage treatment, but also improves the denitrification effect, which is of great significance to energy conservation, emission reduction and sustainable development in the field of sewage treatment; its modular design is convenient for flexible configuration and upgrading according to the actual situation of different sewage treatment plants, has wide applicability, and has extremely high promotion and application value, and contributes to the environmental protection cause; in addition, the intelligent management platform of the present invention can remotely monitor and diagnose, realize fault warning and rapid response, improve operation and maintenance efficiency and safety, further promote the intelligent transformation of the sewage treatment industry, and lay a solid foundation for building a green ecological environment.

Claims

1. Carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling, It is characterized in that include: The side stream sludge hydrolysis tank, the anaerobic tank, the first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank and the secondary sedimentation tank are connected in sequence; The MABR membrane assembly is arranged in the front section of the first anoxic tank; The online monitoring system includes an inlet flow meter (9), internal sludge concentration monitoring sampling points of the first anoxic tank and the second anoxic tank, inlet and outlet water quality monitoring sampling points, and internal water quality monitoring points of the side stream sludge hydrolysis tank, for real-time monitoring of the operating status of the system; The carbon source dosing system comprises a drug storage tank (2), a dosing pump and a dosing control valve of the first anoxic tank and the second anoxic tank, which are connected to the PLC central control system (1) via a control signal line and receive a control signal to perform carbon source dosing; The sludge external return system and the internal return system, including an internal return pump (11), an external return pump (14), a side stream sludge return pump (17) and corresponding flow meters and control valves, are connected to the PLC central control system (1) via a second signal line (25) to receive control signals to adjust the sludge return; The PLC central control system (1) is used to receive signals from the online monitoring system, analyze the system operation status according to a preset optimization control method, and automatically adjust the operation status of the sludge return system and the carbon source addition system to achieve optimization control of carbon source addition.

2. The carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling according to claim 1, It is characterized in that The online monitoring system comprises: An inlet water flow meter (9), used for real-time monitoring of the process inlet water flow rate, which is connected to the PLC central control system (1) via a first signal line (28); The sludge concentration monitoring sampling point uses a small sampling pump to take samples at regular intervals, and uses a sludge concentration analyzer (7) to analyze the sludge concentration, and then transmits the results to the PLC central control system (1); At the water quality monitoring sampling point, a small sampling pump is used to take samples at regular intervals, and the COD, ammonia nitrogen, and total nitrogen indicators of the samples are analyzed using a water quality detection analyzer (8), and the results are transmitted to the PLC central control system (1).

3. The carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling according to claim 1, It is characterized in that The carbon source adding system comprises: A medicine storage tank (2), used for storing a carbon source; The dosing pumps and dosing control valves of the first anoxic tank and the second anoxic tank respectively receive control signals from the PLC central control system (1) via the second signal line (25) to perform accurate dosing of the carbon source.

4. The carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling according to claim 1, It is characterized in that The sludge external reflow system and the internal reflow system comprise an internal reflow pump (11), an external reflow pump (14) and a side stream sludge reflow pump (17), each of which is equipped with a flow meter and a control valve, and receives a control signal from a PLC central control system (1) via a control signal line to adjust the sludge reflow rate.

5. The carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling according to claim 1, It is characterized in that The PLC central control system (1) can automatically analyze the system operating status according to the received signal, and based on a preset optimization control method, adjust the operating status of the sludge return system and the carbon source addition system to achieve optimized control of carbon source addition.

6. Carbon source optimization dosing control method based on side stream sludge hydrolysis and MABR coupling, It is characterized in that The method is to adopt the carbon source optimization dosing control system based on side stream sludge hydrolysis and MABR coupling as described in any one of claims 1 to 5 above, and the method comprises the following steps: Step 1: Calculate the C / N ratio based on the COD and total nitrogen influent data of the first anoxic tank as a feedforward parameter, and adjust the sludge external return system or jointly adjust the sludge return system and the carbon source addition system based on the C / N ratio; Step 2: When only the sludge return system is adjusted, the side stream sludge return amount is calculated based on the carbon source optimization control model, and the sludge return is adjusted to supplement the carbon source; Step 3: When the sludge return system and the carbon source addition system are adjusted at the same time, the carbon source addition amount is calculated based on the carbon source optimization control model, and the carbon source addition is supplemented to achieve total nitrogen removal; Step 4: According to the calculation results, the carbon source dosage and sludge circulation volume are adjusted through the PLC central control system (1) to achieve accurate addition and control of the carbon source; Step 5: By comprehensively monitoring the system operating status, adjust the internal reflux and external reflux operations, optimize the system denitrification effect, and reduce the system operating costs.

7. The carbon source optimization dosing control method based on side stream sludge hydrolysis and MABR coupling according to claim 6, It is characterized in that When Step 2 only adjusts the sludge return system, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis tank sludge concentration online monitoring data, based on the carbon source optimization control model, calculate the side stream sludge return flow, and adjust the return flow in detail and accurately by adjusting the sludge return flow. The calculation formula is as follows: （1） in, is the sludge return flow rate of the side stream sludge hydrolysis tank, L / s; is the COD concentration of the side stream sludge hydrolysis tank, mg / L; is the TN concentration of the influent of the first anoxic tank, mg / L; TN design standard for effluent from the biochemical system, mg / L; is the COD concentration of the influent of the first anoxic tank, mg / L; is the effluent COD concentration of the second anoxic pool, mg / L; is the TN reduction factor in the pool; Ammonia nitrogen concentration in the effluent from the second anoxic pool, mg / L.

8. The carbon source optimization dosing control method based on side stream sludge hydrolysis and MABR coupling according to claim 6, It is characterized in that When the sludge return system and the carbon source addition system are adjusted simultaneously in Step 3, the specific optimization control method is to use the biochemical pool inlet flow meter, the first anoxic pool, the second anoxic pool inlet and outlet water quality detection data, and the sludge concentration online monitoring data in the first anoxic pool, the second anoxic pool and the side stream sludge hydrolysis pool. Based on the carbon source optimization control model, the addition amount of the carbon source addition system is calculated, and the side stream sludge is operated at the set maximum flow rate. The total nitrogen removal is achieved by adding additional carbon source. The calculation formula is as follows: （2） in, is the carbon source dosage of the first anoxic pool, kgCOD / L; is the carbon source dosage of the second anoxic tank, kg / L.

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