The Research And Application Of Pollutant Water Quality On-line Monitoring System

Water environment protection has become a social problem for the emerging of new pollution resources resulting from the development of industrial technology. As a result, the sustainable development of water environment is playing an essential part in the economic growth of a country. So it is necessary to study the key implementation technology of pollutant water quality on-line monitoring system and it is significant to develop economy.Firstly, by analyzing the research and application situation of pollutant water quality on-line monitoring of our country, their faults are outlined. Then, according to the actual situation of water quality monitoring in our country, a new system is presented, which could meet the demands of hard work environment, stability and reliability and could do reliably remote monitoring on pollutant water quality via internet. Its structures and advantages are introduced in detail. The whole system consists of three parts: the base station system, the data communication system and the center management system.Secondly, the design and implementation of the base station control system is introduced in detail. The base station control system collects the data from on-line monitoring instruments and transports them to the center management system and controls the base station on-line running. The industrial computer and monitoring instruments compose of local area networks, at the same time MODBUS protocol is selected as network data transfer protocol, the base station system can accomplish the data collecting and long-distance supervision .Thirdly, the theory of data communication system is studied, and the application layer protocol is designed. In accordance with the actual situation of pollutant water quality monitoring, using the GPRS wireless data transmission, the high-speed, stable wireless data transmission between the center management system and base station system is implemented.In the last part of this thesis, the design and development of the center management system is introduced. The application software consists of two parts, the design and implementation of function model and the database part. And a comprehensive database is established with.NET and SQL Server technology.