ABSTRACT
The science and engineering of wastewater treatment has evolved signi‹- cantly over the last century. As the population of the world has increased, our sources of clean water have decreased. This has shifted our focus toward pollution reduction and control. Disposal of wastes and wastewater without treatment in lands and water bodies is no longer an option. An increasing body of scienti‹c knowledge relating waterborne microorganisms and constituents to the health of the population and the environment has spurred the development of new engineered technologies for treatment of wastewater and potential reuse.
