Contents: Process Theory Kinetics and Sludge Quality Control: Activated Sludge Process - Process Theory - Activated Sludge Separation Problems - References Activated Sludge Treatment of Municipal Wastewater U.S.A. Practice: General Approach - Clarifier Design - Aeration Tank (Reactor) Design - Appurtenance Design - Configurations - ReferencesEuropean Practices: Introduction - Historical Perspective - Process Design - Models - Dynamic Models - Aeration Systems - Alternatives to the Main Types of Aeration Units - Secondary Settlement - Process Sequences - Instrumentation, Control, and Automation (ICA) - Some Other Process Variants - Future Trends - ReferencesActivated Sludge Treatment of Industrial Waters: Introduction - Pretreatment of Industrial Wastewater - Characterization of Industrial Wastewater - Principles of Biological Oxidation - Acclimation of Biological Sludges - Kinetics of Organic Removal - Activated Sludge Effluent Variability - Bioinhibition of the Activated Sludge Process - Effect of Temperature - Sludge Quality Control - Stripping of Volatile Organics - Nitrification and Denitrification - Activated Sludge Processes - Treatment of Industrial Wastewaters in Municipal Activated Sludge Plants - Application of Powdered Activated Carbon (PACT) - Final Clarification - Effluent Suspended Solids Control - Laboratory and Pilot Plant Procedures for the Development of Process Design Criteria - Activated Sludge Design Procedure for Soluble Wastewater Using Complete Mix Activated Sludge - Design Procedure for a Wastewater Containing Degradable Influent Volatile Suspended Solids - Design for Priority Pollutant Removal - References.