World water resources seem to be abundant; however, only 0.7% of this total amount is usable water. And owing to their nonuniform distribution, some countries have abundant water resources, whereas some others suffer from inadequate water, and even face severe water scarcity problems. Moreover, serious water pollution problems make 1/5 of the world’s population (approximately 1.1 billion people) under the risk of water-related diseases.

In order to give a guideline to maintain the required quality of water according to the intended use, a group of international experts have come together to write this book. Authors target to pass recent available knowledge and information to the readers, who will vary from academicians, professional engineers and scientists, to undergraduate and graduate engineering students concerned with water quality problems all over the world.

This book covers the main fields of Wastewater Treatment with 12 chapters, and uses knowledges in economic, information technologies, biology, etc. to make comprehensive analyses and applications.