With the acceleration of the pace of industrialization in China, the rapid economic growth has led to more serious pollution of water resources. In particular, large amounts of industrial water and municipal sewage have caused the water quality to be increasingly polluted. For the treatment of water pollution, China has paid more and more attention to the protection of water resources and increased its investment. At the same time, the requirements for the operation of various types of sewage treatment related equipment, the monitoring of water quality and the amount of water for the treatment of sewage, the effect of the processing procedures, etc. are also becoming higher and higher, which gives automated instruments for sewage treatment regardless. Both design and application have put forward more and updated requirements. Sewage flowmeter electromagnetic flowmeter water flowmeter waste water flowmeter ChemSta has been dedicated in designing and manufacturing devices used in oil production lines and vegetable protein production lines for more than 30 years. Up to now, there are about 200 successful engineering cases at home and abroad. We have hired over 100 professional engineers in various fields such as machinery, food, electricity and architecture. Hence, we are able to provide appropriate system solutions to meet customer`s requirements. Soybean Oil Production Project Soybean oilseed Cleaning Grading,Soybean oilseed Dehulling,Soybean oilseed Crushing Flaking,Soybean oilseed Extruding Drying Shandong ChemSta Machinery Manufacturing Co.,Ltd. , https://www.oil-proteinmachine.com
1. The role of automated instrumentation in wastewater treatment From the current situation of treating wastewater, many of them use a combination of multiple processes, which in turn reduces various pollution indicators in the wastewater, but regardless of the What is the way and process, in the process of processing, there are actually many parameters, such as temperature, pressure, flow and level difference need to be detected. The traditional use of manual monitoring of the index parameters not only can greatly increase the workload of the staff, but also can lead to an extension of the detection time. However, the aeration value and dissolved oxygen of the sewage are important measures to ensure the quality of the sewage treatment. The instrument can obtain a variety of process inspection parameters so that it can coordinate the various components in the system and the relationships between the processes and control the equipment. Therefore, we must ensure that these important indicators can be monitored in real time, can be a good adjustment and control of a variety of process equipment, and then fully and effectively use the functions of the equipment to promote the sewage treatment effect. In addition, the automation instrument not only has the indispensable guiding function for the sewage treatment process, but also monitors and alarms multiple process processes, ensures equipment and production safety, and has the effect of providing inspection indicators to the corresponding regulatory agencies. Thus, in the sewage treatment, the automation instrument has very important function, is the premise of automatic control and the use of the computer to control, can ensure the reliability of the sewage treatment work and the safety of the operation.
2. Common types of instruments used in wastewater treatment From the perspective of the more common automated instruments in wastewater treatment, they can be mainly divided into two different types, namely, thermal instrument and component analysis instrument. From the perspective of thermal instruments, mainly physical quantity detection instruments, including pressure gauges, temperature gauges, and liquid level and flow detection instruments, etc.; and from the perspective of thermal engineering instruments, mainly consists of three parts, including the sensor The measuring element section, the intermediate transmission section, and the display section converted to other signals. In the sewage treatment process, the component analyzers are often called water quality analyzers, such as on-line BOD and COD meters and dissolved oxygen meters. The main features of the analyzer are diversified forms and strong specificity. However, any component analyzer The scope of application is often limited to analyzing the composition of a medium.
3. Principles to be followed in the selection of automated instruments for wastewater treatment In the process of designing automated instruments for wastewater treatment, many factors must be considered. Not only should the analysis and sampling of automated instruments be representative, but also Taking into account the stability of the automated control system in operation, it can ensure safe operation during the treatment of sewage and promote the improvement of the quality of the effluent during the sewage treatment process.
Therefore, when designing and selecting automatic instruments in the process of sewage treatment, certain principles must be followed.
First of all, it is necessary to select those instruments that can be operated stably, are easy to maintain, operate intelligently, and have high measurement accuracy, thereby reducing the difficulty of instrument management and operation.
Secondly, in addition to considering whether it can operate stably, automated meters applied to the selected process flow of sewage treatment must consider whether it is easy to operate, whether it is economical, energy-saving, and the cost and cost-effectiveness are higher, which in turn makes sewage treatment possible. The cost reduction ensures that the wastewater treatment can maintain the stability of the process.
Again, because the environment for treating sewage is rather harsh, not only measuring in the open air, but also often measuring downhole and in sewage, so the instrument requirements are very strict. Therefore, when selecting the sewage treatment automation instrument, To select the optimal operating environment of the instrument, ensure that the instrument is less likely to malfunction in the measurement environment, and the service life is longer.
Finally, we must also consider that in special circumstances, we must pay more attention to the special features of automated instruments. For example, if the sewage treatment plant is in a minefield, the selected automation instrument must have lightning protection to a certain extent, and be connected with the grounding device to ensure that the instrument can operate safely; and the biogas concentration is high. The automated instruments installed in the mud area must select those instruments with a more reliable anti-explosion system, so as to prevent the acoustic explosion caused by the influence of the biogas during the operation of the equipment, thus causing the sewage treatment plant to cause economic losses.
4. Specific application of automation instruments in sewage treatment
4.1 Application of temperature instrument In the process of anaerobic digestion of sewage treatment, temperature and pressure instruments are often used to monitor the progress of anaerobic digestion, and the conditions of anaerobic digestion are adjusted in time to help anaerobic digestion. It provides reliable and scientific support. In the application of temperature meters, platinum thermal resistance is the most commonly used thermal element. In the process of sewage treatment, there are not many control points that can monitor the temperature, so you must use a temperature transmitter. The thermal signal is converted into an electrical signal, and the electrical signal is connected with the analog module at the same time, so that the process of data processing and extraction is simplified.
4.2 Application of flow meters In the process of treating sewage, flow meters also play a very important role and can monitor the key parameters such as the amount of incoming and outgoing water, sludge return flow, and aeration volume of the sewage treatment plant. In turn, the operating conditions of the sewage treatment equipment are controlled, and the reference for the operation status of the sewage treatment equipment is provided, which promotes the economic benefits of the sewage treatment plant. The more commonly used flow meters include electromagnetic flowmeters, ultrasonic flowmeters, and differential pressure flowmeters, which can be used to monitor the flow rate through a number of different process solutions, and thus promote the stability and safety of the operation of the sewage treatment equipment.
4.3 Application of Chemical Oxygen Demand Analyzer Chemical oxygen demand is a very important measure of wastewater treatment performance. The so-called chemical demand refers to the total amount of effluent oxidizer consumed in a unit volume under certain conditions, which makes it an important parameter to measure the organic content in sewage. Therefore, in the process of treating sewage, it is necessary to strengthen the determination of the COD index, which has very important guiding value for the adjustment of the sewage treatment process and the improvement of the sewage treatment effect.
4.4 Application of Dissolved Oxygen Meter From the current process of treating sewage, the activated sludge method, aerobic anaerobic microbial treatment method and biofilm method are widely used. Dissolved oxygen in water is one of the important factors that make microorganisms maintain normal life activities. Therefore,
The monitoring of dissolved oxygen in water is of great help to the maintenance of microbial activity. It can also provide a scientific basis for the regulation of aeration, helping to avoid the problem of filamentous swelling of sludge in the activated sludge process, and promoting sewage. Improved processing results. From the point of view of composition, the dissolved oxygen meter can be divided into two parts: the transmitter and the sensor. Therefore, when using it, it is necessary to pay attention to the installation position of the dissolved oxygen meter to ensure the accuracy of the instrument measurement.
From the current human existence environment, the pollution caused by industrial water and urban water is getting more and more serious, and water resources as scarce resources are threatening the survival and development of human beings. Therefore, the treatment of sewage becomes more obvious. Urgent and important. As an important part of the sewage treatment equipment, the function of the automation instrument is self-evident, it not only plays an important function in the entire sewage treatment system, but also is the basis of the computer and automatic control, so, combined with the actual situation is appropriate It is very important and necessary to choose the automation instrument and understand its specific application.