Electromagnetic flow meters play a role in wastewater treatment

The treatment of industrial wastewater is an important part of environmental protection work. With the continuous expansion and upgrading of industrial production, the pollution problems caused by industrial production have also become a tight hoop that affects and restricts industrial production. At the national level, pollution control and environmental protection The demands of the people and the call of the people for green mountains and clear waters have become the consensus of the whole society. Industrial production produces a large amount of industrial wastewater, which will cause serious pollution to the ecological environment if it cannot be effectively treated. When carrying out wastewater treatment, the quality and flow of wastewater must be monitored in real time. This is the basic guarantee to ensure the effectiveness of wastewater treatment measures. It is necessary to ensure the stable and orderly operation of automated online detection and control instruments and various supporting equipment. Work. The electromagnetic flowmeter is an important part of this and plays an important role in the flow calculation and control of the entire sewage entry and discharge. In the application of automated online testing instruments, we must understand the types and parameter characteristics of the testing instruments used in order to properly manage and technologically transform them. This article will explore the application of automated online detection instruments in wastewater treatment. In the process of treating industrial wastewater, online detection instruments play a very important role. When applying these online monitoring instruments, the use of more advanced science and technology enables the online detection instruments to realize automatic operation, greatly reducing the manpower and material resources consumed in online detection work, and realizing timely adjustment of the wastewater treatment process. Therefore, we must master the application characteristics of various instruments in online detection and rationally utilize these characteristics in actual applications to improve the application efficiency of automated online detection instruments, promote the improvement of wastewater treatment efficiency, and make contributions to ecological and environmental protection. corresponding contribution.

1. Structure and characteristics of automated online detection instruments

Automated online detection instruments such as electromagnetic flow meters are an important part of industrial wastewater treatment systems. Generally speaking, the mechanism of automated online detection instruments is mainly composed of three parts: sensor, transmitter and display. Among these three parts, the function of the sensor is mainly to detect the analog quantity that needs to be detected using signal detection, while the function of the transmitter is mainly responsible for converting the analog signal measured by the sensor into a current line signal and converting it into a current line signal. These signals are transmitted to the programmable controller (PLC), and the display is used to display the results of all online tests for the convenience of staff. In the actual application process, the three parts are closely integrated as an organic whole and are complementary to each other. No matter which part is missing, the online detection function cannot be successfully realized. Automated online detection instruments have the characteristics of simple operation, clear measurement and clear display. They have been widely used in industrial wastewater treatment and are an important part of the wastewater treatment automation control system. 2. Main process flow of wastewater treatment 2.1 Overview of wastewater treatment process flow In general, the process flow of wastewater treatment is mainly divided into the following three stages: , primary treatment stage. The treatment at this stage is to apply physical treatment methods to keep the wastewater in suspension.The solid contaminants in the state are filtered out. The treated wastewater can remove about 30% of BOD substances, but it cannot meet the discharge standards and can only be used as the pretreatment stage of the secondary treatment stage. Second, the secondary processing stage. This stage of treatment can remove BOD substances and COD substances in the colloid or dissolved state in the wastewater, and the removal rate can be as high as more than 90% to ensure that organic pollutants meet emission standards. Third, the third level processing stage. This stage of treatment can remove organic matter in wastewater that is difficult to degrade, as well as soluble inorganic matter such as nitrogen and phosphorus that can cause eutrophication in water. The applied treatment methods mainly include coagulation sedimentation method, biological nitrogen and phosphorus removal method, ion exchange method, activated carbon adsorption method and sand filtration method. 2.2 Specific operation process of wastewater treatment The specific operation process of wastewater treatment is as follows: First, the operation in the primary treatment stage is to use a coarse grid to filter the wastewater once, and then use a lift pump to lift the wastewater through a sand filter or grid, and then Inject it into the grit settling tank, where the sand and water are separated and then flow into the primary sedimentation tank. Secondly, the operation of the secondary treatment stage is to inject the wastewater flowing out of the primary sedimentation tank into the biological treatment equipment. The biofilm method or the activated sludge method can be used to biologically treat the wastewater. The reactor used in the activated sludge method includes an oxidation ditch. and aeration tanks, etc., while the reactors used in the biofilm method include biological turntables, biological filters, and biological fluidized beds. After the water flows out of the biological treatment equipment, it immediately flows into the secondary sedimentation tank. The settled water can be transferred to the next treatment stage after being disinfected. Finally, the three-stage treatment stage is to use coagulation sedimentation method, ion exchange method, activated carbon adsorption method, sand filtration method, etc. to treat the water. 3. Application of automated online detection instruments 3.1 Application of ultrasonic liquid level difference meter In the wastewater treatment system, the ultrasonic liquid level difference meter should be installed in the coarse grid and fine grid. This instrument can be used to calculate the passage of wastewater through detection. The liquid level difference before and after the grille is used to reflect the blocking rate of the grille. At the same time, these data are sent to the programmable controller for further analysis. If the detected liquid level difference is higher than the specified value, the grille should be properly processed and the garbage inside the grille must be removed to ensure that the waste water can pass through normally and reduce the wear rate of the equipment. 3.2 Application of ultrasonic liquid level meter In order to realize automatic control of the water inlet lift pump, we can install the ultrasonic liquid level meter at the water inlet pump well, so that the water level in the pump well can be accurately detected and the detection data can be transmitted to the available equipment in a timely manner. Program the controller and the host computer to systematically analyze and calculate it, and then rationally control the corresponding program based on the analysis results to control the automatic operation of the lifting pump. In this way, the lift pump can be adjusted according to the amount of wastewater to reduce the fatigue of the lift pump. 3.3 Application of ultrasonic flow meter In the process of wastewater treatment management, water flow is a very important technical parameter. Being able to accurately grasp and control the flow of water is not only very important for controlling process parameters, but also improves the ability to resist hydraulic load impact.key factors. In traditional flow detection, we generally use detection equipment such as Venturi flow cells or weir plates. However, these detection methods have the disadvantage that the detection results cannot be displayed in real time. However, using ultrasonic flow meters to detect water flow can fundamentally solve the protocol problem, improve the real-time display of water flow detection results, accurately grasp the flow of wastewater treatment, and provide a reliable basis for wastewater treatment management. 3.4 Application of dissolved oxygen meter In automated online detection instruments, the dissolved oxygen meter is mainly installed in the aeration tank to detect the dissolved oxygen in the tank and transmit the detected data information to the programmable controller and the host. computer to systematically analyze and calculate it. The system will start or stop the aeration disk operation based on the analysis results of dissolved oxygen, which can not only optimize the biochemical capacity of the bacterial flora, but also save energy consumption to a certain extent and protect the treatment equipment. 3.5 Application of sludge concentration meter In the wastewater treatment process, sludge concentration is an important parameter. For the detection of sludge concentration, the traditional method is to use detection during experiments. However, this detection method has a large gap in terms of timeliness and accuracy, and cannot detect the return sludge and remaining sludge. Make timely process adjustments to the mud volume. In order to solve this kind of problem, we install the sludge concentration meter in the aeration tank, which can detect the sludge concentration at any time and improve the accuracy of detection. It can not only realize the timely measurement of the amount of return sludge and remaining sludge. process adjustment, and can effectively reduce the workload of laboratory staff. 3.6 Application of electromagnetic flowmeter In order to improve the detection efficiency of the return sludge and remaining sludge flow, the electromagnetic flowmeter can be installed in the return sludge pipeline and the remaining sludge pipeline to achieve automatic detection of the two flow rates, and the installation is simple , easy to maintain. After applying the electromagnetic flowmeter, the staff can judge the working status of the return sludge pump and the remaining sludge pump based on the display results of the meter, which effectively solves the problem of being unable to accurately judge whether the submersible pump is working properly. 4. Management of automated online detection instruments When managing automated online detection instruments in sewage treatment systems, you need to pay attention to the following points: 4.1 Pay attention to the cleaning of online detection instruments. Online detection instruments must be cleaned regularly by dedicated personnel to ensure that the instruments Clean and improve the accuracy of data collection, especially instruments that have direct contact with sewage, including dissolved oxygen meters and sludge concentration meters. During the cleaning process, be careful to use soft tools to avoid damaging the instrument. 4.2 Regular calibration of online detection instruments During long-term operation, online detection instruments may have detection errors. In order to ensure the accuracy of their detection results, these instruments must be calibrated regularly. At the same time, laboratory staff need to analyze the corresponding test items, compare them with the on-site instrument test results, and calibrate the instruments in a timely manner. 3. Conclusion In summary, in the process of wastewater treatment, automated online detection instruments play a very important role.The role of these instruments and the reasonable application of these instruments are conducive to effective control of the wastewater treatment process.