Unit 1
Domestic Waste Water System: Importance and scope of sanitary engineering – Sewerage system – classification– relative merits and situations for adoption. Sources of wastewater – Quantity – fluctuations in flow and their significance. Storm runoff estimation. Factors affecting storm water drainage – empirical and rational methods – time of concentration.
Waste Water Pipe Hydraulics: Hydraulics of waste water flow – Hydraulic element charts – Design Criteria – construction procedure – Testing and maintenance – Shapes and materials of sewers – Sewer appurtenances – Design of storm water line – surface drains for storm water.
Characteristics: Wastewater characteristics and significance – Decomposition – cycles of decomposition – Dissolved oxygen – Biochemical Oxygen Demand – Formulation – Test for 5 day BOD – significance and limitations – Relative stability – Sewage sampling – population equivalent of industrial effluents – Effluent disposal standards.
Unit 2
Waste Water Treatment – Primary Treatments: Objectives – Selection of unit operation and process – Principle and Design of Preliminary Treatments: Screens, skimming tank – types, grease traps – grit chamber – proportional flow weir – Principle and Design of Primary Treatments settling tanks – Types – Design of sedimentation tanks.
Secondary Treatment Processes: Biological process – object, principles of action – Suspended culture systems – Attached culture systems – Activated sludge process and its types – Design of conventional activated sludge process – Oxidation / stabilization ponds – aerobic and facultative ponds, Trickling Filters (conventional and high rate) .
Sludge characteristics – Weight volume relationship, sludge conditioning, dewatering, sludge digestion – process and parameters. Design and Drawing (Detailed sketch) of Septic Tank, IS Code provisions – Methods of septic tank effluent disposal – Testing soil permeability for determination of area.
