Wastewater online monitoring program
※ Background of sewage treatment
The economic development of any country in the world is accompanied by the improvement of people's living standards and the accelerating process of urbanization, but the corresponding demand and consumption of fresh water resources are also increasing. With the rapid development of China's economy and the increase of the degree of industrialization, the pollution of water resources is also intensifying, especially the increase of the discharge of urban sewage and industrial sewage, which leads to the increasingly bad quality of the water environment and the increasingly serious shortage of water resources. All these have increased the load of cities, bringing a series of ecological environmental problems that endanger the survival and development of cities.
※ How to improve
In order to implement sewage treatment more efficiently, a set of online monitoring system for sewage treatment is adopted by organically combining the manager's and sewage treatment process.
The online monitoring system is a comprehensive online automatic monitoring system with online automatic analysis instruments as the core and modern sensor technology, automatic measurement technology, computer application technology, relevant professional analysis software and communication network. Compared with the traditional sewage treatment technology, the online monitoring system can realize the automatic operation of the whole process, while reducing the help of manpower, which not only saves a lot of manpower and material resources, reduces the operation cost, but also shortens the monitoring time, realizes the real-time sewage monitoring, truly reflects the treatment of the sewage plant, and avoids the blind spots.
According to the situation of the sewage treatment plant and previous project experience, the following important indicators of sewage treatment are listed.
1. Temperature: The temperature of wastewater has a great impact 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 ℃ and 25 ℃. The temperature of industrial wastewater is related to the production process of discharged wastewater.
2. PH: Because the main process of urban sewage treatment plant is biochemical treatment process, and the appropriate PH of microorganisms in the biochemical tank is neutral, so the ph changes greatly, that is, acid or alkali bias will affect or even kill microorganisms in the biochemical tank and damage the treatment system.
3. Dissolved oxygen: because there are anaerobic bacteria and aerobic bacteria in sewage treatment, aerobic bacteria need oxygen. Dissolved oxygen represents the oxygen content in the water. If the oxygen content in the water is insufficient, aerobic bacteria cannot survive, and there is no way to treat sewage.
4. Sludge concentration: if the sludge concentration is too high, the oxygen consumption rate will increase, which is easy to cause insufficient dissolved oxygen and oxygen deficiency, or cause a large number of microbial deaths due to insufficient nutrition; On the contrary, if the sludge concentration is too low, the dissolved oxygen is too high, and the sludge is not discharged for a long time, the sludge is easy to age. Generally, the activated sludge concentration is controlled between 2-4g/L.
5. Conductivity: The size of the conductivity in the wastewater indicates the number of inorganic ions in the water. If the conductivity rises sharply, there is often a sign of abnormal industrial wastewater discharge.
According to these parameters, a set of online monitoring system for sewage treatment is designed.
※ Monitoring system
System composition:
1 Multi parameter cabinet type instrument cabinet
2 Relevant electrode probe
3 Upper computer system
4 Wireless 485 or GPRS transmission module
5 Network database
The online monitoring system has the functions of system control, data query, management setting, instrument control and reset, which fully combines the 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 adopts advanced multi parameter measuring instruments and electrode probes, which can provide a strong guarantee for the safe, stable and reliable operation of the monitoring system; The wireless 485 or GPRS communication mode is adopted to transmit the monitoring data quickly and stably, making the monitoring system more real-time; The application of large network database makes it convenient for maintenance personnel to store, manage and analyze data.
The establishment of online monitoring system for sewage treatment facilitates the maintenance personnel to collect data on water quality at all levels, realizes the purpose of remote management and monitoring, and further improves the automation and networking degree of sewage treatment system. In addition, the data accumulated from the long-term operation of the online monitoring system for sewage treatment can also objectively and accurately reflect the changes of sewage, which has played a positive role in promoting the implementation of the urban water environment protection strategy in China.
