The course is designed to expose the students to wastewater treatment technology. The course will emphasize on basic environmental microbiology, characteristics of wastewater, wastewater analysis, design of conventional wastewater treatment systems and sludge treatment. For design of wastewater treatment systems, it will cover the design of clarifier, waste stabilization pond, conventional activated sludge, extended aeration, sequential batch reactor, aerated lagoon and trickling filters. The course also covers the sewage quality standards under Environmental Quality Act 1974. The course exposes students to select the suitable wastewater treatment systems for certain application. At the end of the course, the students should be able to apply the knowledge to design a simple unit operation of wastewater treatment systems and also to modify existing unit operation.