Intelligent agent adding control system and method for sewage treatment plant

Abstract

The invention relates to an intelligent agent adding control system and method for a sewage treatment plant, and belongs to the technical field of sewage treatment. The device mainly comprises a biochemical treatment unit, a coagulative precipitation tank, a disinfection tank, a control device, a dosing pump, an electric control valve and the like. The biochemical treatment unit carries out primary treatment on the sewage, and then the sewage enters the coagulative precipitation tank and the disinfection tank, the computer technology is deeply fused, centralized monitoring, all-around control management and efficient decentralized control are carried out on the production process of sewage treatment, and the dosage and the like can be adjusted and optimized in real time. Compared with a traditional agent adding mode, the system constructed by the invention has the characteristic of high automation, the sewage treatment effect is guaranteed, the dosage of the agent is effectively reduced, the production cost is remarkably reduced, and a powerful technical support is provided for efficient and economic operation of a sewage treatment plant.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly relates to a smart dosing control system and method for chemicals in a sewage treatment plant. Background Art

[0002] In the sewage treatment process, the use of chemicals mainly serves to remove suspended substances and toxic and harmful substances in water, stabilize sludge, deodorize and decolorize, accelerate flocculation, remove scale, etc., so as to enable the treated water quality to meet the requirements. In the intelligent chemical dosing system, the system can accurately dose the appropriate amount of chemicals according to the changes in water quality and water volume, avoiding waste. At the same time, there are detailed and accurate records regarding the use of chemicals, which are convenient for staff to query and help managers make correct judgments. In order to solve the problems of unsatisfactory effluent water quality or waste of chemicals, we propose a dosing control system and method for chemicals in a sewage treatment plant again. Summary of the Invention

[0003] The purpose of the present invention is to provide a dosing control system for chemicals in a sewage treatment plant to improve the efficiency and accuracy of chemical dosing. A smart dosing control system for chemicals in a sewage treatment plant includes a pretreatment unit, a biochemical treatment unit, a coagulation sedimentation tank, a post-treatment unit, a disinfection tank, and a control device. Before the biochemical treatment unit, there are a phosphate meter, a carbon-nitrogen ratio detector, a chemical dosing pump, and a proportional valve. After the coagulation sedimentation tank, there are a phosphate meter, a carbon-nitrogen ratio detector, and a fecal coliform monitor. The phosphate meter, the carbon-nitrogen ratio detector, and the fecal coliform monitor are connected to the control device.

[0004] For the above-mentioned smart dosing control system for chemicals in a sewage treatment plant, the chemical storage tank is connected to the biochemical treatment unit through a pipeline. The pipeline is provided with a chemical flow meter, a chemical dosing pump, and a proportional valve. The chemical storage tank is provided with a chemical liquid level gauge, and the outlet pipeline of the disinfection tank is provided with an outlet flow meter.

[0005] For the above-mentioned smart dosing control system for chemicals in a sewage treatment plant, the pretreatment unit includes a coarse grid, a sump, a fine grid, a swirl sedimentation tank, and a sand-water separator. The biochemical treatment unit includes an anaerobic tank, an anoxic tank, and an aerobic tank. The post-treatment unit includes a secondary sedimentation tank and an intermediate water tank.

[0006] For the above-mentioned smart dosing control system for chemicals in a sewage treatment plant, the control device includes an LSTM data processing system and a PLC control system. The PLC control system includes a computer and a PLC control box;

[0007] The phosphate meter, the carbon-nitrogen ratio detector, the fecal coliform monitor, the chemical liquid level gauge, the chemical flow meter, the outlet flow meter, and the computer are respectively connected to the input end of the PLC control box. The proportional valve is connected to the output end of the PLC control box.

[0008] The above-mentioned intelligent dosing control system for sewage treatment plant chemicals, wherein the LSTM data processing system includes an influent advance module and an effluent feedback module.

[0009] The above-mentioned intelligent dosing control system for sewage treatment plant chemicals further includes a manual main ball valve arranged between the chemical storage tank and the chemical flowmeter.

[0010] The above-mentioned intelligent dosing control system for sewage treatment plant chemicals further includes a spare manual ball valve and a maintenance manual ball valve. The chemical flowmeter is respectively connected to a proportional valve and the spare manual ball valve. The proportional valve is connected to the maintenance manual ball valve. The biological treatment unit is respectively connected to the spare manual ball valve and the maintenance manual ball valve.

[0011] The control method of the above-mentioned intelligent dosing control system for sewage treatment plant chemicals includes:

[0012] The effluent flowmeter inputs the effluent flow rate Q to the control device;

[0013] The control device calculates the required dosage of disinfectant chemical q according to the effluent flow rate Q and the pre-set chemical consumption per 100 tons of water L;

[0014] q = Q × L × 10 -2

[0015] wherein, q is the chemical dosage (L / h), Q is the effluent flow rate (m 3 / h), and L is the chemical consumption per 100 tons of water (L / 100m 3 );

[0016] The control device compares the required dosage of disinfectant chemical q with the flow rate Q1 of the chemical flowmeter, and controls the opening degree K of the proportional valve.

[0017] The above-mentioned control method further includes:

[0018] According to the calculated chemical dosage q, a fixed value of the chemical dosage is selected;

[0019] Correspondingly, the control device compares the required chemical dosage q with the flow rate Q1 of the chemical flowmeter, and controls the opening degree K of the proportional valve. Specifically:

[0020] The control device compares the fixed value of the chemical dosage with the flow rate Q1 of the chemical flowmeter, and controls the opening degree K of the proportional valve.

[0021] In the above-mentioned control method, the control device is provided with manual and automatic dosing states;

[0022] In the automatic state, according to the flow rate Q of the effluent flowmeter and the single consumption L of the medicine added per hundred tons of water, calculate the required dosage q of the medicine to be added;

[0023] In the manual state, the required dosage q of the medicine to be added is a fixed amount.

[0024] Compared with the prior art, the present invention has the following effects: By building an intelligent water service system in the sewage treatment plant and using advanced technologies such as GIS, big data, and intelligent algorithms, it helps the staff to more comprehensively understand the operation status of the sewage treatment plant; By arranging front-end sensing devices, the sewage quality is dynamically monitored in real time and transmitted to the data processing system. The data processing system uses the LSTM algorithm to calculate the intelligent dosing model, and cooperates with the dosing device to achieve precise dosing of the medicine; The data processing system transmits the calculated dosing amount to the PLC control system through a signal, and the PLC control system controls the operation of the solenoid valve and the dosing pump to add the medicine into the sewage. Description of the Drawings

[0025] Figure 1 is the process flow chart of a medicine dosing control system and method for a sewage treatment plant of the present invention.

[0026] Figure 2 is the flow chart of the intelligent dosing control system of the present invention.

[0027] Figure 3 is the technical roadmap of a medicine dosing control system and method for a sewage treatment plant of the present invention.

[0028] Figure 4 is the process flow of the dosing system of a medicine dosing control system and method for a sewage treatment plant of the present invention. Detailed Embodiments

[0029] Embodiment 1

[0030] The sewage inlet of the sewage pipe network is sequentially connected to the pre-treatment unit (coarse grille, collecting tank, fine grille, sand and water separator, vortex grit chamber), biochemical treatment unit (including anaerobic tank, anoxic tank, aerobic tank), post-treatment unit (secondary sedimentation tank, intermediate water tank), coagulation sedimentation tank, rotary disc filter, and disinfection tank. An influent flowmeter is provided in front of the coarse grille, a phosphate meter 1 and a carbon-nitrogen ratio analyzer 1 are provided in front of the anaerobic tank. A phosphate meter 1, a carbon-nitrogen ratio analyzer 2, and a fecal coliform detector 1 are provided after the coagulation sedimentation tank.

[0031] The chemical agent storage tank is connected to the biochemical treatment unit through a pipeline. A chemical agent flowmeter, a chemical dosing pump, and a proportional valve are provided on the pipeline. A chemical agent level gauge is provided on the chemical agent storage tank, and an outlet flowmeter is provided on the outlet pipeline of the disinfection tank. A manual main ball valve, a spare manual ball valve, and a maintenance manual ball valve are provided between the chemical agent storage tank and the chemical agent flowmeter. The chemical agent flowmeter is respectively connected to the proportional valve and the spare manual ball valve. The proportional valve is connected to the maintenance manual ball valve. The biological treatment unit is respectively connected to the spare manual ball valve and the maintenance manual ball valve. The chemical agent storage tank contains sodium acetate and glucose. Sodium hypochlorite is used for disinfection in the disinfection tank.

[0032] The control device includes an LSTM data processing system and a PLC control system. The PLC control system includes a computer and a PLC control cabinet; the LSTM data processing system includes an inlet advance module and an outlet feedback module.

[0033] The phosphate meter 1, phosphate meter 2, carbon-nitrogen ratio determination 1, carbon-nitrogen ratio determination 2, fecal coliform monitor 1, chemical agent level gauge, chemical agent flowmeter, outlet flowmeter, and computer are respectively connected to the input end of the PLC control cabinet. The proportional valve is connected to the output end of the PLC control cabinet.

[0034] As Figure 1 shown, after the sewage enters the system from the sewage pipe network, it first intercepts large-particle impurities through a coarse grille. Subsequently, after the sewage adjusts the water volume and water level in the collection tank, it enters the fine grille to remove fine suspended solids to protect the subsequent equipment. The sand and heavy suspended solids are efficiently removed through a sand-water separator and a swirl grit chamber, and the separated supernatant flows into the anaerobic tank. In the anaerobic tank, the sewage is mixed with the returned sludge, and the organic matter is degraded by anaerobic microorganisms to produce biogas. The anaerobic effluent enters the anoxic tank, where denitrification and nitrogen removal are carried out, and a carbon source is supplemented synchronously to optimize the nitrogen removal efficiency. The anoxic tank effluent enters the aerobic tank, and the aerobic microorganisms are activated through aeration to further degrade COD, ammonia nitrogen, and the remaining phosphorus. Part of the sludge is returned to the anoxic tank to maintain the microbial concentration in the system. The treated sewage enters the secondary sedimentation tank for mud-water separation. The supernatant is stored in the intermediate water tank as intermediate water, and the sludge is partially returned to the anaerobic tank through the sludge return pump house, and the excess sludge is transported to the sludge storage tank. The intermediate water is added with PFS and PAM in the coagulation reaction sedimentation tank to form flocs and precipitate. The clarified water removes residual suspended solids through a rotary disk filter and finally enters the ultraviolet disinfection tank to kill pathogens. The up-to-standard tail water is discharged through the tail water discharge pipeline. The sludge treatment system operates synchronously: the sludge in the sludge storage tank is filtered and dehydrated in the dehydration workshop to form sludge cakes, which are transported out for disposal, and the filtrate is returned to the sewage treatment system for re-treatment to achieve resource recycling.

[0035] As Figure 2As shown, after the sewage enters the system from the inlet, the phosphate meter 1 and the carbon-nitrogen ratio detector 1, as the front-end data acquisition module, detect the water quality parameters in real time, and the data is synchronously transmitted to the LSTM data processing system. After receiving the data, the LSTM data processing system transfers it to the PLC control system. This model is trained based on historical operation data to generate a dynamic prediction model, and calculates the theoretical optimal chemical dosage under the current working conditions. In the effluent data acquisition (data collected by the phosphate meter 2, the carbon-nitrogen ratio detector 2, and the fecal coliform monitor) section, the system detects the water quality indicators again and compares them with the preset target values. If the three consecutive detections are all within the error tolerance range, it is determined as "no change in chemical dosage", and the process ends; if the fluctuation exceeds the threshold, the system automatically marks it as an abnormal working condition, triggers an alarm and records a log.

[0036] As Figure 3 As shown, this embodiment discloses a chemical dosing control system for a sewage treatment plant, including: The LSTM data processing system includes key components such as an inlet feedforward module, an outlet feedback module, a PLC control system, a chemical dosing pump, and an electric control valve. Among them, the inlet feedforward module and the outlet feedback module are respectively used for data preprocessing and feedback regulation. The PLC control system, as the control center of the entire system, is responsible for receiving and processing data from various sensors and sending out corresponding control signals. In the chemical dosing section, there is a specific chemical dosing direction. The chemical dosing pump is used to transport the chemicals into the system. To accurately control the chemical dosage, the system is equipped with sensors such as a phosphate meter and a carbon-nitrogen ratio detector to monitor the water quality parameters, and adjusts the working state of the chemical dosing pump through the PLC control system according to these parameters. The chemicals are stored in a specific storage tank and are connected to each reaction tank through a chemical delivery pipeline. On the chemical delivery pipeline, a chemical flow meter is set to monitor the chemical flow rate, and a proportional valve is set to adjust the chemical dosing ratio. To monitor the disinfection effect and water quality status, an effluent flow meter is set on the effluent pipeline of the disinfection tank to monitor the effluent flow rate, and sensors such as a phosphate meter, a carbon-nitrogen ratio detector, and a fecal coliform monitor are set at different positions of the system to monitor the water quality parameters in real time. The entire system indicates the data flow path through the water flow direction, and the water quality data transmission direction and the control signal transmission direction describe the information flow direction. The PLC control system adjusts the working state of components such as the chemical dosing pump and the electric control valve according to the received water quality data and control signals to achieve precise control of the entire system to ensure that the effluent water quality meets the preset standards.

[0037] As Figure 4As shown in the figure, the sewage enters the system from the sewage inlet. First, the chemical agent PFS is added at the dosing point. After the water quality is preliminarily adjusted, it enters the biological treatment unit. This unit promotes microbial metabolism and degrades organic matter through bio-electrothermal technology. At the same time, a seal is used to prevent gas leakage to ensure a stable reaction environment. The water volume and the ratio of the chemical agent are dynamically adjusted according to the influent signal to avoid over-dosing. After physicochemical treatment, the dosing amount of the chemical agent is calculated in real time by the PLC controller: The PLC receives the feedback of the influent signal and the effluent signal, and dynamically optimizes the dosing strategy in combination with the built-in LSTM model to ensure that the utilization rate of the chemical agent is ≥90%.

[0038] Among them, the disinfection chemical storage tank contains the disinfection chemical sodium hypochlorite.

[0039] Furthermore, the control device includes a computer and a PLC control box; the chemical agent level gauge, the chemical agent flow meter, the effluent flow meter, and the computer are respectively connected to the input end of the PLC control box, and the proportional valve is connected to the output end of the PLC control box.

[0040] It should be noted that the computer can also be replaced by a terminal display touch screen. The single consumption of the chemical agent L added per 100 tons of water is set on the computer. The PLC control box compares the flow rate of the chemical agent flow meter and the single consumption of the chemical agent L in real time to control the opening degree K of the proportional valve, so that the required chemical agent dosage q is stabilized at the required dosing amount, achieving the purpose of accurate dosing of the chemical agent.

[0041] Furthermore, the control system also includes a manual main ball valve 80 arranged between the chemical agent storage tank and the chemical agent flow meter.

[0042] Furthermore, the control system also includes a spare manual ball valve and a maintenance manual ball valve. The chemical agent flow meter is respectively connected to the proportional valve and the spare manual ball valve. The proportional valve is connected to the maintenance manual ball valve. The reaction tank is respectively connected to the spare manual ball valve and the maintenance manual ball valve.

[0043] It should be noted that the PLC control box in this embodiment includes a PLC controller, a circuit breaker, a miniature relay, a switching power supply, a terminal block, and an external instrument wire. Among them, the output end of the circuit breaker is connected to the switching power supply, the switching power supply is connected to the PLC controller, the output end of the PLC controller is connected to one end of the miniature relay, and the other end of the miniature relay is connected to the terminal block.

[0044] This embodiment discloses a method for controlling the dosing of chemical agents in a sewage treatment plant, including the following steps:

[0045] The effluent flow meter inputs the effluent flow rate Q to the control device;

[0046] Specifically, the effluent flow meter inputs the effluent flow rate into the PLC controller.

[0047] The control device calculates the required chemical dosage q according to the size of the effluent flow rate Q and the pre-set chemical consumption per 100 tons of water L.

[0048] q = Q × L × 10 -2

[0049] where q is the chemical dosage to be added (L / h), Q is the effluent flow rate (m 3 / h), and L is the chemical consumption per 100 tons of water (L / 100 m 3 ).

[0050] Specifically, the PLC controller calculates the required chemical dosage q according to the size of the effluent flow rate Q and the chemical consumption per 100 tons of water L pre-set on the computer.

[0051] The control device compares the required chemical dosage q with the size of the chemical flowmeter Q1 and controls the opening degree K of the proportional valve.

[0052] It should be noted that the units of Q and Q1 are m3 / h and L / h, respectively, and the unit of the opening degree K of the proportional control valve is %.

[0053] It should be noted that the control device compares the required chemical dosage q with the real-time size of the chemical flowmeter Q1,

[0054] and continuously adjusts the opening degree K of the proportional control valve until the required chemical dosage q = the real-time chemical flowmeter Q1 and tends to be stable to achieve the purpose of accurate chemical dosing.

[0055] Furthermore, the control method in this embodiment further includes the following steps:

[0056] Select a fixed value of the chemical dosage to be added according to the calculated chemical dosage q;

[0057] Correspondingly, the control device compares the required chemical dosage q with the size of the chemical flowmeter Q1 and controls the opening degree K of the proportional valve, specifically:

[0058] The control device compares the fixed value of the chemical dosage to be added with the size of the chemical flowmeter Q1 and controls the opening degree K of the proportional valve.

[0059] It should be noted that in actual applications, since the effluent flow rate of the effluent flowmeter is constantly changing in real time, and the calculated chemical dosage to be added by the system is also constantly changing according to the effluent flowmeter and the process requirement of the chemical consumption per unit water, in order to avoid continuous tuning of the proportional valve of the controlled object back and forth, a fixed value is given within the range of the calculated small chemical dosage, so as to truly achieve accurate chemical dosing.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It is not intended to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sewage treatment plant intelligent reagent dosing control system, characterized by: It includes a pre-treatment unit, a biochemical treatment unit, a coagulation and sedimentation tank, a post-treatment unit, a disinfection tank, and a control device. A phosphate meter, a carbon-nitrogen ratio meter, a dosing pump and a proportional valve are arranged in front of the biochemical treatment unit, and a phosphate meter, a carbon-nitrogen ratio meter and a fecal coliform monitor are arranged after the coagulation and sedimentation tank. The phosphate meter, the carbon-nitrogen ratio meter and the fecal coliform monitor are connected to the control device.

2. The intelligent dosing control system for sewage treatment plants as claimed in claim 1, characterized in that: The reagent storage tank is connected to the biochemical treatment unit through a pipeline, on which a reagent flow meter, a dosing pump and a proportional valve are arranged, a reagent level meter is arranged on the reagent storage tank, and an outlet flow meter is arranged on the outlet pipe of the disinfection pool.

3. The intelligent dosing control system for sewage treatment plants as claimed in claim 2, characterized in that: The pre-treatment unit includes a coarse screen, a water collection tank, a fine screen, a cyclone sedimentation tank, and a sand-water separator. The biochemical treatment unit includes an anaerobic tank, an anoxic tank, and an aerobic tank. The post-treatment unit includes a secondary sedimentation tank and an intermediate water tank.

4. The intelligent dosing control system for sewage treatment plants as claimed in claim 3, characterized in that: The control device includes an LSTM data processing system and a PLC control system, and the PLC control system includes a computer and a PLC control box; The phosphate meter, carbon-nitrogen ratio measuring instrument, fecal coliform monitoring instrument, agent level meter, agent flow meter, water outlet flow meter and computer are respectively connected to the input end of the PLC control box, and the proportional valve is connected to the output end of the PLC control box.

5. The intelligent dosing control system for sewage treatment plants as claimed in claim 4, characterized in that: The LSTM data processing system comprises a water inlet forward module and a water outlet feedback module.

6. The intelligent dosing control system for sewage treatment plants as claimed in claim 5, characterized in that: It also includes a manual main ball valve arranged between the medicine storage tank and the medicine flow meter.

7. The intelligent dosing control system for sewage treatment plants as claimed in claim 6, characterized in that: It also includes a spare manual ball valve and a maintenance manual ball valve. The pharmaceutical flow meter is connected to the proportional valve and the spare manual ball valve respectively. The proportional valve is connected to the maintenance manual ball valve. The biological treatment unit is connected to the spare manual ball valve and the maintenance manual ball valve respectively.

8. A control method for a sewage treatment plant intelligent reagent dosing control system as described in any one of claims 1 to 7, characterized in that: include: The water outlet flow meter inputs the water outlet flow size Q into the control device; The control device calculates the required disinfection dosage q according to the water flow rate Q and the preset dosage L of 100 tons of water; q=Q×L×10 -2 Among them, q is the dosage (L / h), Q is the water flow rate (m 3 / h), L is the unit consumption of 100 tons of water medicine (L / 100m 3 ); The control device controls the size of the proportional valve opening K according to the comparison between the required disinfectant dosage q and the flow rate Q1 of the agent flow meter.

9. The control method according to claim 8, characterized in that: Also includes: According to the calculated dosage q, a fixed value of the dosage is selected; Correspondingly, the control device controls the size of the proportional valve opening K according to the comparison between the required dosage q and the flow rate Q1 of the drug flow meter, specifically: The control device controls the size of the proportional valve opening K according to the comparison between the fixed value of the dosage amount and the flow size Q1 of the medicine flow meter.

10. The control method according to claim 9, characterized in that: The control device is provided with manual and automatic dosing states; In the automatic state, the required dosage q is calculated according to the flow rate Q of the water outlet flow meter and the dosage L of the medicine added per 100 tons of water; In manual mode, the required dosage q is a fixed amount.

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