Book excerpt: Activated sludge is the most vital wastewater process today. Now, this recent book provides a comprehensive guide to the modelling and design of activated sludge systems. Written by two leaders in the wastewater field, the book presents extensive and up-to-date coverage of all areas in the activated sludge process microbiological basis, reactor kinetics, and design methodologies. The book is organized for easy reference and is ideal as a text or desktop guide.