Necessity for sanitation, methods of domestic wastewater disposal, types of sewerage systems and their suitability.Dry weather flow, factors affecting dry weather flow, flow variations andtheir effects on design of sewerage system; computation of design flow,estimation of storm flow, rational method and empirical formulae of designof storm water drain. Time of concentration.
DESIGN OF SEWERS: Hydraulic formulae for velocity, effects of flowvariations on velocity, self cleansing and non scouring velocities, Design ofhydraulic elements for circular sewers flowing full and flowing partially full(No derivations).MATERIALS OF SEWERS: Sewer materials, shapes of sewers, laying ofsewers, joints and testing of sewers, ventilation and cleaning of sewers
Catch basins, manholes, flushing tanks, oiland grease traps, Drainage traps. Basic principles of house drainage. Typicallayout plan showing house drainage connections, maintenance of housedrainage.
Sampling, significance,techniques and frequency. Physical, Chemical and Biological characteristics,Aerobic and Anaerobic activity, CNS cycles. BOD and COD. Theirsignificance & problems
Disposal of Effluents by dilution, self-purification phenomenon. Oxygen sag curve, Zones of purification, Sewagefarming, sewage sickness, Effluent Disposal standards for land, surface water & ocean. Numerical Problems on Disposal of Effluents. Streeter Phelpsequation.
Flow diagram of municipal wastewater treatment plant. Preliminary & Primary treatment : Screening, gritchambers, skimming tanks, primary sedimentation tanks – Design criteria &Design examples.
Suspended growth and fixed filmbioprocess. Trickling filter – theory and operation, types and designs.Activated sludge process- Principle and flow diagram, Modifications of ASP,F/M ratio. Design of ASP.
Anaerobic Sludge digestion, Sludge digestion tanks, Design of Sludge dryingbeds. Low cost waste treatment method. Septic tank, Oxidation Pond andOxidation ditches – Design. Reuse and recycle of waste water.