General Terms - Sewage, domestic sewage, sewage treatment, disposal, scope, Role of an environmental engineer, Historical overview. Sewage Characteristics Quality parameters: BOD, COD, TOC, Solids, DO, Nitrogen, Phosphorus, Standards of disposal into natural watercourses and on land, Indian Standards. Collection of sewage Systems of sewerage: separate, combined, and partially separate, components of sewerage systems, systems of layout, A quantity of sanitary sewage and variations, the quantity of stoffil water, Rational method, shapes of sewer, circular and egg-shaped, A Hydraulic design of sewers: diameter, Self-cleansing velocity and slopes, Construction and testing of sewer lines, Sewer materials, Joints and appurtenances, Sewage pumping and pumping stations. Sewage Treatment Various units: their purposes sequences and efficiencies,...