The Design And Research Of Sewage Multiparameter Monitoring System Based On Embedded

Environmental problem is one of the major social problems in the society. In China, due to the rapid population growth and the accelerating pace of industrialization, the environmental pollution keep serious, Environmental pollution has become one of the important issues in today's society. Water pollution is an important component of environmental pollution, the state and local governments have attached great attention to the reasonable discharge of sewage and comprehensive treatment. There were many parameters to be monitor before the water to be discharged,such as chemical oxygen demand,biological oxygen demand,PH,with P and so on.The monitoring instrument could monitor the chemical oxygen demand of sewage,PH value,temperature and other parameters, and make the results to storage and display.Monitoring of chemical oxygen demand of sewage is an important indicator of sewage, and therefore achieve chemical oxygen demand of sewage line monitoring is essential.Althongh in the market,there is a lot of monitoring equipment to get the chemical oxygen demand of sewage. but most of the instruments with little high precision monitoring, measurement takes a long time, can not achieved online surveillance and secondary pollution.Although the monitoring of foreign equipment do a lot of improvement on the accuracy,the monitoring time and the secondary pollution, foreign equipment is expensive, not suitable for popularization and promotion in our country.This project use the new principle-the electrochemical theory to measure the chemical oxygen demand of sewage. Not only to solve the long time monitoring time problem and the secondary pollution problem, and equipment manufacturing costs are lower, but also with intelligent network,the advantages of miniaturization, is a more ideal instrument for monitoring chemical oxygen demand of sewage.In the monitor of the chemical oxygen demand in wastewater was to complete the selection of the main principles,the hardware design of the monitoring equipment and the software design of the monitoring instruments,and in the end of the paper presented the method the improve the instrument.In this issue of monitoring methods in the selection of the electrochemical measurement of chemical oxygen demand, by the three-electrode system, hydroxyl radicals produced by electrolysis, oxidation of organic matter in water, through the consumption of electricity to monitor the effluent chemical oxygen demand, very good to overcome the above shortcomings.In the hardware design of the monitoring instrument, this project completed the design of the field control module and the circuit design center, the field control is congtrolled by the AT89C51,the central control module is controlled by the S3C44B0. Also this project completed a display module, alarm module, memory module and other auxiliary module circuit design. In this issue of the network modules are also designed to enable online sharing of monitoring data can be achieved, greatly facilitates the discharge of administrative supervision departments of the supervision.In the software design of the monitoring instrument, the project completed the field control module and the central control module, the field control module programming use the Keil c, central control module use the uClinux operating system, programming on the RedHat2.4 completed the bottom-driven design and application development of the S3C44B0.At the same time the instrument also comes with a standard 0 to 5V input monitoring signals; greatly facilitate the expansion of the performance of the instrument.