Water and wastewater engineering is one of the world's biggest and most interdisciplinary industries, employing chemists, microbiologists, botanists, zoologists as well as engineers, computer specialists and a range of different management professionals. This accessible student textbook provides a broad overview of the sector, introducing the reader to the key concepts of water technology by explaining the fundamentals of hydrobiology, aquatic ecosystems, water and supply and wastewater treatment. In 2000 the Water Framework Directive came into force - this is the most substantial piece of EC water legislation to date. Professor Gray uses the Water Framework Directive as the unifying theme of this new edition taking into account the implications of compliance and practice, as well as discussing the topical issue of sustainable principles in water management. . Covers water quality and regulation . Deals with water quality assessment, management and treatment . Includes a new chapter on sustainability within water technology.