Abstract
The environmental protection has become one of the factors that affect and restrict the development of human society. With the continuous development of industry and the rapid increase of urban population, a large number of industrial and domestic sewage discharges into rivers and lakes without treatment, so that the environment and the application of water are seriously polluted. In this paper, the principle and characteristics of PLC（PLC is the abbreviation of Programmable Logic Controller）are introduced; the process of PLC sewage treatment is expounded, and the application of PLC in sewage treatment is described.
Highlights
Water pollution is one of the urgent problems to be solved worldwide, especially in china
The PLC system is applied to the sewage treatment plant, so it means that modern high and new technology has been adopted in the process, equipment and management, which has greatly promoted the scientific progress of the industry and created the obvious social and economic benefits
4) The PLC system is applied to the sewage treatment plant and adopts the modern high and new technology in the process, equipment and management, which has greatly promoted the scientific progress of the industry and created the obvious social and economic benefits [12]
Summary
Water pollution is one of the urgent problems to be solved worldwide, especially in china. In 1980s, Chinese government began to tilt to environmental protection It promoted a large number of sewage treatment facilities in cities. The use of advanced automatic control instrumentation, PLC and industrial configuration software make sewage treatment automation and achieve the central control room unattended, greatly improving production efficiency and reliability. Comparison the traditional sewage treatment plant by adopting manual control, PLC system greatly improves the degree of automation of wastewater treatment [3]. The PLC system is applied to the sewage treatment plant, so it means that modern high and new technology has been adopted in the process, equipment and management, which has greatly promoted the scientific progress of the industry and created the obvious social and economic benefits
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