Mixed treatment equipment for precise dosing of sewage and control method

Abstract

The present invention provides a sewage precise dosing mixing treatment device and a control method, the sewage precise dosing mixing treatment device comprises: a dosing module for adding a medicament into a sewage pipeline; the on-line detection module comprises a first on-line detection module and a second on-line detection module, and the first on-line detection module is arranged at the upstream of the dosing module and is used for detecting water quality parameters of the sewage in real time; the second online detection module is arranged at the downstream of the dosing module and is used for detecting water quality parameters of the sewage after dosing in real time; the mixing strengthening module is arranged between the chemical adding module and the second online detection module and is used for promoting mixing of the chemical and the sewage; the circulation control module is in communication connection with the online detection module and is used for judging a treatment result according to the water quality parameters and enabling the sewage to flow back to the upstream of the dosing module for retreatment when the result does not reach the standard; the device is high in mixing efficiency and dosing precision, has a closed-loop control mechanism, and is good in equipment maintainability.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a mixing treatment device and control method for precise dosing of wastewater. Background Technology

[0002] In wastewater treatment processes, the precise dosing of chemical agents and the efficient mixing of agents and wastewater are core aspects of ensuring treatment effectiveness and reducing operating costs. Existing wastewater treatment chemical mixing equipment primarily focuses on optimizing the structure of the dosing device, improving mixing methods, and enhancing control precision. However, several technical shortcomings remain: First, low mixing efficiency. Traditional equipment often relies on mechanical stirring or natural turbulence to mix agents and wastewater, resulting in long mixing times and high energy consumption. Furthermore, mechanical stirring is easily limited by blade speed and flow pattern, is sensitive to suspended solids concentration, and is prone to causing flow channel blockage. Second, insufficient dosing precision. Most equipment adopts… Controlling the dosage using liquid level control or simple proportional adjustment lacks a real-time water quality feedback mechanism. The dosage is only indirectly estimated through liquid level, making it susceptible to fluctuations in reagent concentration, leading to reagent waste or insufficient dosing. The pre-dissolution process of solid reagents is also prone to precipitation problems. Thirdly, there is a lack of closed-loop control mechanism. Although some equipment is equipped with simple feedback adjustment, it does not achieve dynamic linkage between dosage and mixing intensity, nor does it have a mechanism for recycling wastewater exceeding standards. This can easily lead to secondary pollution due to insufficient mixing. Fourthly, the structure is difficult to maintain. Traditional dosing and mixing equipment often adopts a one-piece molded cylinder design, which makes disassembly and assembly cumbersome during inspection and maintenance, significantly reducing operation and maintenance efficiency.

[0003] To address the issue of insufficient dosing precision, patent CN111320246A discloses an intelligent precision dosing control system for coagulants based on multivariable control. This system collects multi-dimensional water quality and quantity parameters by setting up feedforward and feedback units, and uses a computing center to establish a multivariable control mathematical model to calculate the optimal dosage of coagulants, achieving intelligent adjustment of the dosage. This solves, to some extent, the problems of inaccurate dosing, high consumption, and high cost associated with traditional methods. However, this control system only focuses on the calculation and control of the dosage, without optimizing the mixing efficiency between the coagulant and wastewater. It still relies on traditional mixing methods, resulting in long mixing times and high energy consumption. Furthermore, the system lacks a mechanism for recycling wastewater exceeding standards and does not achieve dynamic linkage between dosage and mixing intensity, failing to fundamentally solve the problem of poor wastewater treatment results due to insufficient mixing. In addition, the system's structural design does not consider ease of operation and maintenance, lacking a modular, quick-assembly design, making it difficult to meet the integrated requirements of precise dosing and efficient mixing in wastewater treatment processes.

[0004] To address the problems existing in the above-mentioned technologies, there is an urgent need to develop a wastewater precision dosing and mixing treatment equipment that integrates precise metering dosing, multi-parameter online detection, efficient mixing enhancement, and closed-loop circulation control. This equipment would achieve intelligent linkage of dosing, detection, mixing, and circulation, improve dosing accuracy and mixing efficiency, reduce energy consumption and operation and maintenance costs, and meet the actual needs of wastewater treatment. Summary of the Invention

[0005] In view of this, the present invention aims to propose a mixing treatment device and control method for precise dosing of wastewater. One of the problems solved by the present invention is that the existing wastewater treatment dosing mixing devices have low mixing efficiency, insufficient dosing precision, and lack of closed-loop control mechanism. Another problem solved is that the existing wastewater treatment dosing mixing devices have poor structural maintainability.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A wastewater precision dosing mixing treatment device includes:

[0008] A dosing module, which is connected to a sewage pipeline, is used to add chemicals to the sewage pipeline;

[0009] The online detection module includes a first online detection module and a second online detection module. The first online detection module is located upstream of the dosing module and is used to detect the water quality parameters of the wastewater in real time. The second online detection module is located downstream of the dosing module and is used to detect the water quality parameters of the wastewater after dosing in real time.

[0010] A mixing enhancement module is disposed between the dosing module and the second online detection module to promote the mixing of the reagent with the wastewater;

[0011] The circulation control module is communicatively connected to the online detection module. It is used to determine the treatment result based on the water quality parameters and, if the result is not up to standard, to return the wastewater to the upstream of the dosing module for further treatment.

[0012] In some embodiments, the dosing module includes a chemical storage tank and a dosing pipeline, which are connected by a pipeline. The chemical storage tank is used to store chemicals, and the dosing pipeline is used to deliver the chemicals in the chemical storage tank into a sewage pipeline.

[0013] In some embodiments, the dosing pipeline includes a main dosing pipeline and a backup dosing pipeline. The main dosing pipeline is equipped with a main dosing pump, which drives the chemicals in the chemical storage tank to enter the sewage pipeline through the main dosing pipeline. The backup dosing pipeline is equipped with a backup dosing pump, which drives the chemicals in the chemical storage tank to enter the sewage pipeline through the backup dosing pipeline.

[0014] In some embodiments, both the main dosing pump and the standby dosing pump are driven by servo motors, and their flow control accuracy is ±0.5%.

[0015] In some embodiments, the online detection module includes a multi-parameter water quality sensor, which is used to detect the pH, turbidity, ORP, conductivity and flow parameters of wastewater in real time, and transmit the parameters to the circulation control module.

[0016] In some embodiments, the mixing enhancement module is a mixer, which includes a vortex mixing unit and an ultrasonic cavitation unit. The vortex mixing unit is used to form a vortex flow between wastewater and the agent to achieve rapid mixing of the agent and wastewater. The ultrasonic cavitation unit is used to break down and disperse the agent to achieve deep mixing of the agent and wastewater.

[0017] In some embodiments, the vortex mixing unit includes multi-stage vortex blades with an inclination angle of 45°, and the ultrasonic cavitation unit operates at a frequency of 20–40 kHz.

[0018] In some embodiments, the circulation control module includes a circulation pipeline, one end of which is connected to the upstream of the dosing module and the other end of which is connected to the downstream of the online detection module. The circulation pipeline is equipped with a circulation pump and a circulation valve for switching the fluid flow direction.

[0019] In some embodiments, the dosing module, online detection module, and mixing enhancement module are all modularly designed and connected via quick-connect flanges.

[0020] This application also provides a control method for the aforementioned wastewater precision dosing mixing treatment equipment, comprising the following steps:

[0021] S1: System starts, execute S2;

[0022] S2: The first online detection module collects the wastewater flow rate Q and water quality parameters. Execute S3;

[0023] S3: The cycle control module calculates the initial dosage. Execute S4;

[0024] S4: The dosing module performs dosing according to the initial dosage. During chemical dosing, the circulation control module activates the mixing enhancement module to mix the wastewater with the chemicals, executing step S5.

[0025] S5: The second online detection module collects the water quality parameters of the mixed-treated wastewater. and the water quality parameters The data is transmitted to the loop control module, and S6 is executed.

[0026] S6: The loop control module is used to determine... Does the preset water quality standard meet the requirements? If yes, proceed to S7; otherwise, proceed to S8.

[0027] S7: Control the outlet valve of the sewage pipe to open and close the circulation valve to discharge the sewage in the sewage pipe, and execute S15;

[0028] S8: The circulation control module calculates the amount of supplementary agent added ΔD, sends a secondary dosing command to the dosing module, and simultaneously controls the mixing enhancement module to keep running, mixing the wastewater after the secondary dosing, and executes S9;

[0029] S9: The second online detection module collects the water quality parameters of the wastewater after secondary mixing. and the water quality parameters The data is transmitted to the loop control module, and S10 is executed.

[0030] S10: The loop control module is used to determine... Does the preset water quality standard meet the requirements? If yes, proceed to S7; otherwise, proceed to S11.

[0031] S11: The loop control module counts the number of loops, n=n+1, and executes S12;

[0032] S12: The loop control module determines whether n≥3 is true. If yes, then execute S13; otherwise, execute S14.

[0033] S13: The cycle control module activates an alarm, controls the main dosing pipeline to stop operating, and switches to the standby dosing pipeline, executing S15;

[0034] S14: Close the outlet valve of the sewage pipeline and open the circulation valve to transport the sewage downstream of the online detection module to the upstream of the dosing module through the circulation pipeline, and execute S3;

[0035] S15: Process complete.

[0036] Compared with existing technologies, the wastewater precision dosing mixing treatment equipment and control method of the present invention have the following advantages:

[0037] 1) The first online detection module detects key parameters such as the flow rate, turbidity, and pollutant concentration of raw sewage in real time, which facilitates the circulation control module to calculate a reasonable initial dosage, thereby reducing the defects of waste or insufficient dosage of chemicals from the source;

[0038] 2) By placing the mixing enhancement module between the dosing module and the second online detection module, the reagents are forced and efficiently mixed before entering the detection stage, which can avoid detection distortion caused by insufficient mixing of wastewater and reagents.

[0039] 3) The second online detection module can immediately detect water quality after the dosing and mixing, directly verify the treatment effect, and can judge in real time whether the dosage is appropriate and whether the mixing is sufficient. This facilitates the correction of the calculated value by the circulation control module. This setting enables the equipment to dynamically adjust the operating parameters of the dosing module and the mixing enhancement module to adapt to the fluctuation of the influent water quality and achieve adaptive precision dosing.

[0040] 4) The circulation control module directly determines whether the treatment meets the standards based on the detection results of the downstream second online detection module without manual intervention. If the standards are met, the wastewater is discharged normally; if the standards are not met, the backflow is immediately started, and the wastewater exceeding the standards is sent back to the upstream of the dosing module to re-participate in the "dosing-mixing-detection" process, thus realizing the closed-loop re-treatment of unqualified wastewater.

[0041] 5) The dosing module, online detection module, and mixing enhancement module all adopt a modular design and are connected by quick-connect flanges. When the equipment fails, the corresponding module can be quickly located without disassembling the entire machine for troubleshooting. At the same time, the quick-connect flange is easy to install and remove, and maintenance personnel can quickly complete the disassembly and replacement of modules, improving the efficiency of fault handling and the overall maintainability of the equipment. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of the mixing processing equipment described in an embodiment of the present invention;

[0043] Figure 2 This is a cross-sectional view of the hybrid reinforcement module described in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Dosing Module; 11. Chemical Storage Tank; 110. Level Gauge; 12. Dosing Line; 121. Main Dosing Line; 1210. Main Dosing Pump; 122. Backup Dosing Line; 1220. Backup Dosing Pump; 2. Online Detection Module; 21. First Online Detection Module; 22. Second Online Detection Module; 3. Mixing Enhancement Module; 31. Vortex Mixing Unit; 32. Ultrasonic Cavitation Unit; 33. Rotary Dosing Port; 4. Circulation Control Module; 41. Circulation Pipeline; 42. Circulation Pump; 43. Circulation Valve; 100. Wastewater Pipeline; 101. Outlet Valve. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] like Figure 1-2 As shown, this embodiment provides a mixing treatment device for precise dosing of wastewater, including:

[0048] A dosing module 1 is connected to a sewage pipe 100 and is used to add chemicals into the sewage pipe 100.

[0049] The online detection module 2 includes a first online detection module 21 and a second online detection module 22. The first online detection module 21 is located upstream of the dosing module 1 and is used to detect the water quality parameters of the wastewater in real time. The second online detection module 22 is located downstream of the dosing module 1 and is used to detect the water quality parameters of the wastewater after dosing in real time.

[0050] A mixing enhancement module 3 is disposed between the dosing module 1 and the second online detection module 22 to promote the mixing of the reagent with the wastewater;

[0051] The circulation control module 4 is communicatively connected to the online detection module 2. It is used to determine the treatment result based on the water quality parameters, and when the result is not up to standard, to return the sewage to the upstream of the dosing module 1 for further treatment.

[0052] Specifically, the first online detection module 21 detects key parameters such as the flow rate, turbidity, and pollutant concentration of the raw sewage in real time, which facilitates the circulation control module 4 in calculating a reasonable initial dosage, thereby reducing the defects of waste or insufficient dosage of chemicals from the source.

[0053] By placing the mixing enhancement module 3 between the dosing module 1 and the second online detection module 22, the reagents are forced to be mixed efficiently before entering the detection stage, which can avoid detection distortion caused by insufficient mixing of wastewater and reagents.

[0054] The second online detection module 22 can immediately detect water quality after chemical dosing and mixing, directly verify the treatment effect, and compare the results with the target value. It can judge in real time and accurately whether the dosage is appropriate and whether the mixing is sufficient, which facilitates the correction of the calculated value by the circulation control module. This setting enables the equipment to dynamically adjust the operating parameters of the dosing module and the mixing enhancement module to adapt to the fluctuation of the influent water quality and achieve adaptive precision dosing.

[0055] The circulation control module 4 directly determines whether the treatment meets the standards based on the detection results of the downstream second online detection module 22, without manual intervention. If the standards are met, normal effluent is discharged; if not, a backflow is immediately initiated, sending the substandard wastewater back upstream of the dosing module 1 to re-participate in the "dosing-mixing-detection" process. This achieves closed-loop re-treatment of substandard wastewater, avoiding the direct discharge and secondary pollution problems caused by the lack of a circulation mechanism in traditional equipment. Simultaneously, in the event of a sudden deterioration in influent water quality, the circulation mechanism can provide additional treatment capacity. Through multiple cycles of dosing and mixing, the equipment can smoothly cope with shocks and prevent the direct discharge of substandard wastewater.

[0056] In some embodiments, the dosing module 1 includes a chemical storage tank 11 and a dosing pipeline 12, which are connected by a pipeline. The chemical storage tank 11 is used to store chemicals, and the dosing pipeline 12 is used to deliver the chemicals in the chemical storage tank 11 into the sewage pipeline 100.

[0057] Specifically, the reagent storage tank 11 can store a certain capacity of reagents, ensuring that the equipment does not need frequent reagent additions over a long period of time, supporting continuous and stable dosing operations, and is suitable for the continuous requirements of wastewater treatment processes. The separate design of the reagent storage tank 11 and the dosing pipeline 12 breaks the space limitations of integrated dosing devices. The reagent storage tank 11 can be set in a safe area away from the sewage pipeline, in a location convenient for reagent replenishment and storage, and can be extended to the dosing point of the sewage pipeline 100 only through the dosing pipeline 12. This saves installation space around the sewage pipeline 100 and allows for flexible adjustment of the pipeline route according to the on-site pipeline layout, adapting to the complex working conditions of industrial wastewater treatment sites.

[0058] Preferably, the medicine storage tank 11 is equipped with a level gauge 110, which is used to detect the level of medicine in the medicine storage tank 11.

[0059] In some embodiments, the dosing pipeline 12 includes a main dosing pipeline 121 and a backup dosing pipeline 122. The main dosing pipeline 121 is equipped with a main dosing pump 1210, which drives the chemicals in the chemical storage tank 11 to enter the sewage pipeline 100 through the main dosing pipeline 121. The backup dosing pipeline 122 is equipped with a backup dosing pump 1220, which drives the chemicals in the chemical storage tank 11 to enter the sewage pipeline 100 through the backup dosing pipeline 122.

[0060] Specifically, the backup dosing pipeline 122 serves as a backup for the main dosing pipeline 121. When the main dosing pipeline 121 fails, the system can quickly switch to the backup dosing pipeline 122 to administer chemicals, thus improving the operational stability of the dosing module 1. Furthermore, when the main dosing pipeline 121 requires cleaning, maintenance, or replacement of parts, the system can directly switch to the backup dosing pipeline 122 to continue administering chemicals without shutting down the entire wastewater treatment equipment. This enables online maintenance of the main channel, avoiding wastewater treatment losses due to equipment downtime and significantly reducing operation and maintenance time costs.

[0061] In some embodiments, both the main dosing pump 1210 and the standby dosing pump 1220 are driven by servo motors, and their flow control accuracy is ±0.5%.

[0062] Specifically, this setup can precisely control the pump displacement of the main dosing pump 1210 and the standby dosing pump 1220, achieving precise addition of the agent and completely solving the problem of over- or under-dosing caused by insufficient driving precision of traditional dosing pumps.

[0063] In some embodiments, the online detection module 2 includes a multi-parameter water quality sensor, which is used to detect the pH, turbidity, ORP, conductivity and flow parameters of wastewater in real time, and transmit the parameters to the circulation control module 4.

[0064] Specifically, multi-parameter water quality sensors simultaneously collect key parameters such as pH, turbidity, ORP, conductivity, and flow rate, which can reflect the characteristics of wastewater from different dimensions, avoid the limitations of single-parameter feedback, and provide reliable data support for wastewater treatment.

[0065] In some embodiments, the mixing enhancement module 3 is a mixer, which includes a vortex mixing unit 31 and an ultrasonic cavitation unit 32. The vortex mixing unit 31 is used to form a vortex flow between wastewater and the agent to achieve rapid mixing of the agent and wastewater. The ultrasonic cavitation unit 32 is used to break down and disperse the agent to achieve deep mixing of the agent and wastewater.

[0066] Specifically, the vortex mixing unit 31 can form a high-intensity vortex flow, breaking the laminar flow state of the sewage, increasing the contact area between the agent and the sewage, and enabling the agent to quickly integrate into the sewage; the cavitation effect of the ultrasonic cavitation unit 32 can generate high-speed micro-jet and shock wave, further breaking the agent particles. The synergy of the two can enable the agent to fully contact the sewage, greatly improving the reaction efficiency between the agent and pollutants in the sewage.

[0067] Preferably, the mixing enhancement module 3 is also provided with a rotary dosing port 33. The rotary dosing port 33 can, through its own rotation, scatter the agent delivered by the dosing module 1 into the mixing flow field of the mixing enhancement module 3 in a multi-directional manner, avoiding the agent from accumulating in large quantities in local areas to form agent clusters, so that the agent can achieve initial dispersion and contact with the sewage from the initial stage of addition, and shorten the dispersion time of the agent.

[0068] In some embodiments, the vortex mixing unit 31 includes multi-stage vortex blades with an inclination angle of 45°, and the ultrasonic cavitation unit 32 operates at a frequency of 20–40 kHz.

[0069] Specifically, the 45° tilt angle multi-stage blade design enables the reagent and wastewater to form a high-intensity vortex within the vortex mixing unit 31, completing multiple swirling, cutting, and fusion processes to fully cut and disperse the reagent, avoiding local aggregation. It also effectively reduces fluid resistance within the flow channel. Compared to the weak swirling at larger tilt angles (e.g., 60°), the high resistance at smaller tilt angles (e.g., 30°) achieves the optimal balance between swirling effect and energy consumption. The 20–40kHz frequency range is beneficial for generating effective cavitation in water-based fluids. This avoids the problems of weak cavitation effect, inability to break up small reagent particles, and poor deep mixing associated with low-frequency ultrasound below 20kHz. It also solves the drawbacks of excessive cavitation, soaring energy consumption, and the potential for strong equipment vibration, noise, and even damage to the mixer's inner wall caused by high-frequency ultrasound above 40kHz. The cavitation effect in this frequency band can precisely generate high-speed microjets and shock waves, achieving micro- and nano-scale dispersion of the reagent. The mixer, through this design, enables the mixing time between the agent and the wastewater to be less than or equal to 3 seconds, and compared with the traditional mechanical stirring mixing method, it can also reduce energy consumption by more than 40%.

[0070] In some embodiments, the circulation control module 4 includes a circulation pipe 41, one end of which is connected to the upstream of the dosing module 1 and the other end of which is connected to the downstream of the online detection module 2. The circulation pipe 41 is equipped with a circulation pump 42 and a circulation valve 43 for switching the fluid flow direction.

[0071] Specifically, when the second online detection module 22 determines that the sewage does not meet the standards, the circulation valve 43 is opened, and the circulation pump 42 can drive the sewage to flow back to the upstream of the dosing module 1 for re-treatment, which avoids the direct discharge of substandard sewage and also ensures the consistency of the re-treatment effect of substandard sewage from the process perspective.

[0072] In some embodiments, the dosing module 1, the online detection module 2, and the mixing enhancement module 3 are all modularly designed and connected by quick-connect flanges.

[0073] Specifically, the modules are connected by quick-connect flanges, which can quickly locate the corresponding module when the equipment fails, without the need to disassemble the entire machine for troubleshooting. At the same time, the quick-connect flanges are easy to install and remove, allowing maintenance personnel to quickly disassemble and replace modules, improving the efficiency of troubleshooting and making the equipment more maintainable overall.

[0074] This application also provides a control method for the aforementioned wastewater precision dosing mixing treatment equipment, comprising the following steps:

[0075] S1: System starts, execute S2;

[0076] S2: The first online detection module 21 collects the wastewater flow rate Q and water quality parameters. Execute S3;

[0077] S3: The cycle control module 4 calculates the initial dosage. Execute S4;

[0078] S4: The dosing module 1 performs dosing according to the initial dosage. During the dosing process, the circulation control module 4 activates the mixing enhancement module 3 to mix the wastewater with the chemicals, and executes step S5.

[0079] S5: The second online detection module 22 collects the water quality parameters of the mixed-treated wastewater. and the water quality parameters The data is transmitted to loop control module 4, and S6 is executed.

[0080] S6: The loop control module 4 is used to determine... Does the preset water quality standard meet the requirements? If yes, proceed to S7; otherwise, proceed to S8.

[0081] S7: Control the outlet valve 101 of the sewage pipe 100 to open and the circulation valve 43 to close, so that the sewage in the sewage pipe 100 is discharged, and execute S15;

[0082] S8: The circulation control module 4 calculates the amount of supplementary agent added ΔD and sends a secondary dosing command to the dosing module 1. At the same time, it controls the mixing enhancement module 3 to keep running and mix the wastewater after the secondary dosing. Then, S9 is executed.

[0083] S9: The second online detection module 22 collects the water quality parameters of the wastewater after secondary mixing. and the water quality parameters The data is transmitted to loop control module 4, and S10 is executed.

[0084] S10: The loop control module 4 is used to determine... Does the preset water quality standard meet the requirements? If yes, proceed to S7; otherwise, proceed to S11.

[0085] S11: The loop control module 4 counts the number of loops, n=n+1, and executes S12;

[0086] S12: The loop control module 4 determines whether n≥3 is true. If yes, then execute S13; otherwise, execute S14.

[0087] S13: The cycle control module 4 activates the alarm, controls the main dosing pipeline 121 to stop operating, and switches to the standby dosing pipeline 122, executing S15;

[0088] S14: Close the outlet valve 101 of the sewage pipeline 100 and open the circulation valve 43 to transport the sewage downstream of the online detection module 2 to the upstream of the dosing module 1 through the circulation pipeline 41, and execute S3;

[0089] S15: Process complete.

[0090] Specifically, this control method can automatically complete the calculation of dosing dosage, dosing mixing, water quality judgment, and flow channel switching of the circulation control module 4 based on the real-time detection data of the first online detection module 21 and the second online detection module 22, without manual intervention. Through a stepped design of "first mixing judgment - precise second dosing - circulation backflow for retreatment", the dosage is supplemented in small doses first to reduce ineffective circulation, improve treatment efficiency, and save chemicals. Then, the excessive sewage is returned to the upstream of the dosing module 1 for retreatment using the circulation pipe 41. At the same time, a third circulation protection is set up. The mechanism ensures that wastewater exceeding standards is fully treated and discharge is prevented from the outset, while also avoiding the inefficient operation of equipment indefinite cycles. When the standards are still not met after three cycles, an alarm can be automatically triggered and the main dosing pipeline 121 and the backup dosing pipeline 122 can be switched, which greatly improves the reliability of equipment operation. Furthermore, the outlet valve 101 and the circulation valve 43 of the wastewater pipeline 100 are interlocked, which further ensures the quality of the effluent from the outset. When the wastewater quality and flow rate fluctuate in real time, this control method can respond quickly and adapt to the process requirements of continuous wastewater treatment.

[0091] In some embodiments, in step S4, a fuzzy PID algorithm is used to dynamically adjust the frequency of the main dosing pump 1210 and the standby dosing pump 1220, as well as the power of the hybrid enhancement module 3.

[0092] Specifically, the fuzzy PID algorithm can quickly respond to the wastewater flow rate Q and water quality parameters collected by the first online detection module 21. The nonlinear and time-varying changes can be dynamically adjusted without manual parameter adjustment, so that the operating frequency of the main dosing pump 1210 can be dynamically adjusted (synchronously adapted after the standby dosing pump 1220 is switched) to accurately match the dosage of the agent; at the same time, the power of the mixing enhancement module 3 is adjusted synchronously to make the mixing intensity and the dosage of the agent match in real time, ensuring the stability of the treatment effect.

[0093] In addition, the algorithm breaks the independent control mode of dosing and mixing, so that the dosage and mixing intensity are linked and controlled: when the water quality changes suddenly, such as the concentration of pollutants in the sewage increases or the frequency of the dosing pump increases, resulting in an increase in the dosage, the power of the mixing enhancement module 3 is increased synchronously to ensure that the agent can be fully mixed and reacted with the sewage; when the water quality is good and the dosage is reduced, the mixing intensity is reduced synchronously. This setting avoids uneven mixing and also reduces energy consumption.

[0094] Example 1

[0095] A municipal wastewater treatment plant uses the aforementioned precision chemical dosing mixing equipment for wastewater treatment in its coagulation section. Specific parameters are as follows:

[0096] Wastewater inflow rate is The initial turbidity value is 50 NTU, and the target value is ≤5 NTU.

[0097] The multi-parameter water quality sensor feeds back data to the circulation control module 4 in real time, and calculates the dosage of polyaluminum chloride (PAC) to be 15 mg / L.

[0098] The mixer was started in high-frequency vortex mode (1500 rpm). The turbidity after mixing was measured to be 8 NTU. The circulation valve 43 was started, and the chemical was added again to 18 mg / L. Finally, the turbidity of the effluent was reduced to 3 NTU.

[0099] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A mixing treatment device for precise dosing of wastewater, characterized in that, include: A dosing module (1) is connected to a sewage pipe (100) and is used to add chemicals into the sewage pipe (100); The online detection module (2) includes a first online detection module (21) and a second online detection module (22). The first online detection module (21) is located upstream of the dosing module (1) and is used to detect the water quality parameters of the wastewater in real time. The second online detection module (22) is located downstream of the dosing module (1) and is used to detect the water quality parameters of the wastewater after dosing in real time. A mixing enhancement module (3) is disposed between the dosing module (1) and the second online detection module (22) to promote the mixing of the reagent with the wastewater; The circulation control module (4) is connected to the online detection module (2) for judging the treatment result based on the water quality parameters, and when the result is not up to standard, the sewage is returned to the upstream of the dosing module (1) for further treatment.

2. The wastewater precision dosing mixing treatment equipment according to claim 1, characterized in that, The dosing module (1) includes a drug storage tank (11) and a dosing pipeline (12). The drug storage tank (11) and the dosing pipeline (12) are connected by a pipeline. The drug storage tank (11) is used to store drugs, and the dosing pipeline (12) is used to send the drugs in the drug storage tank (11) into the sewage pipeline (100).

3. The wastewater precision dosing mixing treatment equipment according to claim 2, characterized in that, The dosing pipeline (12) includes a main dosing pipeline (121) and a backup dosing pipeline (122). The main dosing pipeline (121) is equipped with a main dosing pump (1210), which is used to drive the agent in the agent storage tank (11) to enter the sewage pipeline (100) through the main dosing pipeline (121). The backup dosing pipeline (122) is equipped with a backup dosing pump (1220), which is used to drive the agent in the agent storage tank (11) to enter the sewage pipeline (100) through the backup dosing pipeline (122).

4. The wastewater precision dosing mixing treatment equipment according to claim 3, characterized in that, Both the main dosing pump (1210) and the standby dosing pump (1220) are driven by servo motors, and their flow control accuracy is ±0.5%.

5. The wastewater precision dosing mixing treatment equipment according to claim 1, characterized in that, The online detection module (2) includes a multi-parameter water quality sensor, which is used to detect the pH, turbidity, ORP, conductivity and flow parameters of wastewater in real time and transmit the parameters to the circulation control module (4).

6. The wastewater precision dosing mixing treatment equipment according to claim 1, characterized in that, The mixing enhancement module (3) is a mixer, which includes a vortex mixing unit (31) and an ultrasonic cavitation unit (32). The vortex mixing unit (31) is used to make the sewage and the agent form a vortex flow to achieve rapid mixing of the agent and the sewage. The ultrasonic cavitation unit (32) is used to break and disperse the agent to achieve deep mixing of the agent and the sewage.

7. The wastewater precision dosing mixing treatment equipment according to claim 6, characterized in that, The vortex mixing unit (31) includes multi-stage vortex blades with an inclination angle of 45°, and the ultrasonic cavitation unit (32) operates at a frequency of 20 to 40 kHz.

8. The wastewater precision dosing mixing treatment equipment according to claim 1, characterized in that, The circulation control module (4) includes a circulation pipe (41), one end of which is connected to the upstream of the dosing module (1) and the other end is connected to the downstream of the online detection module (2). The circulation pipe (41) is equipped with a circulation pump (42) and a circulation valve (43) for switching the fluid flow direction.

9. The wastewater precision dosing mixing treatment equipment according to claim 1, characterized in that, The dosing module (1), online detection module (2) and mixing enhancement module (3) are all modularly designed and connected by quick-connect flanges.

10. A control method for the wastewater precision dosing mixing treatment equipment according to any one of claims 1-9, characterized in that, The control method includes the following steps: S1: System starts, execute S2; S2: The first online detection module (21) collects the sewage flow rate Q and water quality parameters. Execute S3; S3: The cycle control module (4) calculates the initial dosage. Execute S4; S4: The dosing module (1) according to the initial dosing amount During the dosing process, the circulation control module (4) activates the mixing enhancement module (3) to mix the wastewater with the chemicals, and executes S5. S5: The second online detection module (22) collects the water quality parameters of the mixed wastewater. and the water quality parameters Transmitted to the loop control module (4), execute S6; S6: The cycle control module (4) is used to determine whether C1 meets the preset water quality standard. If yes, execute S7; if no, execute S8. S7: Control the outlet valve (101) of the sewage pipe (100) to open and close the circulation valve (43) to discharge the sewage in the sewage pipe (100), and execute S15; S8: The circulation control module (4) calculates the amount of supplementary agent added ΔD and sends a secondary dosing command to the dosing module (1), while controlling the mixing enhancement module (3) to keep running, mixing the wastewater after the secondary dosing, and executing S9; S9: The second online detection module (22) collects the water quality parameters of the wastewater after secondary mixing. and the water quality parameters Transmitted to the loop control module (4), and execute S10; S10: The loop control module (4) is used to determine Does the preset water quality standard meet the requirements? If yes, proceed to S7; otherwise, proceed to S11. S11: The loop control module (4) counts the number of loops, n=n+1, and executes S12; S12: The loop control module (4) determines whether n≥3 is true. If yes, then execute S13; otherwise, execute S14. S13: The cycle control module (4) starts an alarm, controls the main dosing pipeline (121) to stop running, and switches to the standby dosing pipeline (122), and executes S15; S14: Close the outlet valve (101) of the sewage pipe (100) and open the circulation valve (43) to transport the sewage downstream of the online detection module (2) to the upstream of the dosing module (1) through the circulation pipe (41), and execute S3; S15: Process complete.

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