This course covers the important and most often used unit operations or processes in environmental engineering. The following unit operations will be studied: 1.activated sludge process; 2.sedimentation or settling;3.anaerobic digestion chemical reaction kinetics; 4.flocculation and coagulation; 5.activated carbon adsorption; 6.particulate removal (baghouse); 7.acid gas scrubbing (packed tower scrubber); flue gas measurement. The course is divided into two parts: a two-hour lecture which introduces the principles of unit operations and a three-hour experiment every week.