This course is designed to expose the students to wastewater treatment technology. Topics discussed include basic environmental microbiology, characteristics of wastewater, wastewater analysis (Biological Oxygen Demand, Chemical Oxygen Demand and Suspended Solids), design of conventional wastewater treatment systems, sludge treatment and design of septic tank. For design of wastewater treatment systems, it will cover the design of sedimentation tank, Waste Stabilization Pond, Conventional Activated Sludge, Extended Aeration, Aerated Lagoon and Trickling Filters. At the end of the course, the student should be able to apply the knowledge to design a simple unit operation of wastewater treatment systems and also to modify existing unit operation.