Anaerobic Co-digestion: Principles and Guidelines Toward More Efficient Systems aims to provide comprehensive guidelines and insights for the planning, design, operation and maintenance of anaerobic co-digestion systems. The practice of co-digestion of wastewater residuals with high strength organic wastes and harnessing the resulting biogas has been adopted by a growing number of water resource recovery utilities, particularly over the last decade. This technical publication intends to equip engineering and design professionals, researchers, operations and maintenance staff, educators and students with a detailed understanding of fundamental concepts and practical applications of anaerobic co-digestion.