In this book, Sewage is waste water carrying wastes removed from residences, institutions, commercial and industrial establishments, together with such groundwater, surface water, and storm water as may be present. Its chemical constituents and the bacteriological organisms that it contains. So there is great need to treat waste water. We can treat such water by various methods. The contaminants in waste water are removed by physical, chemical, and biological means. We can achieve desire results with the help of PLC. Using PLC we want to develop an automated continuous process system for...