※ Sewage treatment background
The economic development of any country in the world is accompanied by the improvement of people's living standards and the continuous acceleration of urbanization, but the demand and consumption of corresponding fresh water resources are also increasing. With the rapid economic development and industrialization of our country, the pollution of water resources is also intensifying, especially the increase of urban sewage and industrial sewage discharge, resulting in the worsening quality of water environment and the shortage of water resources. Seriously, all of this has increased the load on the city and brought a series of ecological and environmental problems that endangered the city's survival and development.
As an important indicator of the degree of urban development, the effect of urban sewage treatment has become an important indicator for evaluating the degree of urban development. The effect of urban sewage treatment is not only related to the environmental protection around the city's location, but also to the people in the downstream cities. Physical health and economic development. Accelerating the construction of urban sewage treatment, accelerating the application of new urban treatment technologies, promoting the harmonious development of cities and the implementation of sustainable development routes are the primary tasks of relevant departments of urban sewage treatment.
For the current urban sewage treatment management in China, there are major problems. Because our urban sewage treatment system is relatively backward and the sewage treatment equipment is not perfect, it has led to a project that is truly proficient in the technology of sewage treatment in China. There are not many staffs, and most of the staff fail to meet the requirements in terms of professional wastewater treatment technology and related technical aspects. This has made some cities in China, although some sewage treatment plants have been successfully built, due to the professional technical operators and sewage management system personnel. Lack of ability to operate normally for sewage treatment. At the same time, in the sewage treatment system, because there is no scientific and effective management, there are also many defects and deficiencies in the management level.
※how to improve
In order to implement sewage treatment more efficiently, the manager's and sewage treatment processes are organically combined, and a set of online sewage treatment monitoring system is adopted.
The online monitoring system is a comprehensive online automatic monitoring system composed of online automatic analysis instruments, using modern sensor technology, automatic measurement technology, computer application technology, and related professional analysis software and communication networks. Compared with the traditional sewage treatment technology, the online monitoring system can realize the automatic operation of the whole process, and reduce the manual help, not only save a lot of manpower and material resources, reduce operating costs, but also shorten the monitoring time, and realize the real-time sewage monitoring It truly reflects the treatment situation of the sewage plant and avoids the emergence of blind spots.
According to the situation of the sewage treatment plant and past project experience, the following important indicators for sewage treatment are listed.
1. Temperature: The temperature of wastewater has a great influence on the wastewater treatment process, and the temperature directly affects the microbial activity. Generally, the water temperature of urban sewage treatment plants is between 10 ° C and 25 ° C. The temperature of industrial wastewater is related to the production process of discharged wastewater.
Two PH: Because the main process of the municipal sewage treatment plant is a biochemical treatment process, the suitable pH of the microorganisms in the biochemical tank is neutral, so the pH changes greatly, that is, partial acid or alkali will affect or even kill the microorganisms in the biochemical tank, and destroy Processing system.
Three dissolved oxygen: because there are anaerobic bacteria and aerobic bacteria in the treatment of sewage, aerobic bacteria need oxygen, dissolved oxygen represents the content of oxygen in the water, if there is insufficient oxygen in the water, there is no way for the aerobic bacteria to survive, so there is no Ways to treat sewage.
Four sludge concentrations: If the sludge concentration is too high, the oxygen consumption rate will increase accordingly, and it is easy to cause the phenomenon of insufficient dissolved oxygen and hypoxia, or insufficient nutrition to cause a large number of microorganisms to die. Otherwise, the sludge concentration is too low, the dissolved oxygen is too high, and the long-term No sludge is discharged, and sludge is easily aged. Generally the activated sludge concentration is controlled between 2-4g / L.
Five conductivity: The size of the conductivity in the wastewater characterizes the amount of inorganic ions in the water. If the conductivity rises sharply, there are often signs of abnormal industrial wastewater discharge.
1 Multi-parameter cabinet meter NBDT-1800
2 Related electrode probes
3 PC system
4 Wireless 485 or GPRS transmission module-DTU
5 Network Database-Nobo Cloud Platform
The online monitoring system has functions such as system control, data query, management settings, instrument control and reset, and fully combines measurement and control technology, network technology, communication technology, database technology, storage management technology, etc. The multi-level design is simple and clear. The system terminal uses advanced multi-parameter measuring instruments and electrode probes to provide a strong guarantee for the operation of the monitoring system safely, stably, and reliably. The wireless 485 or GPRS communication method is used to quickly and stably transmit monitoring data, making the monitoring system more real-time. The application of a large network database facilitates the storage, management and analysis of data by maintenance personnel.
The establishment of the sewage treatment online monitoring system facilitates the maintenance personnel to collect water quality data at all levels, achieves the purpose of remote management and monitoring, and further improves the degree of automation and networking of the sewage treatment system. In addition, the accumulated data from the long-term operation of the sewage treatment online monitoring system can objectively and accurately reflect the changes in sewage, which has played a positive role in promoting the implementation of China's urban water environmental protection strategy.