The second edition of this best-selling book provides thorough, updated coverage of unit operations in water/wastewater treatment. Chapter 1 through 5 now provide a strong background in chemical and biological concepts, reactor fundamentals, and other key process. Subsequent chapters present a practical approach to the design of water and wastewater treatment plants, carefully explaining new technologies that affect the design of such facilities. New problems and worked examples have been developed to give readers a greater practical understanding of unit operations.