This manual attempts to describe new treatment methods, and discuss the application of new techniques for more effectively removing a broad spectrum of contaminants from wastewater. Topics covered include: fundamental design considerations, flow equalization, headworks components, clarification of raw wastewater, activated sludge, package plants, fixed growth systems, wastewater treatment ponds, filtration and microscreening, physical-chemical treatment, nutrient removal, sludge and process sidestream handling, disinfection and postaeration, operation and maintenance, and cost effectiveness. A glossary is also included. (Author/BB)