This book is intended to be a reference or textbook on the operation of wastewater treatment plants. The book contains thirty-one chapters and three appendices and includes the description, requirements, and latest techniques of conventional unit process operation, as well as the symptoms and corrective measures regarding process problems. Process subjects discussed include rotating biological reactors, oxygen activated sludge systems, stabilization lagoons, and physical-chemical treatment. Management topics included are effluent disposal, by-product solids disposal, process management and control, odor control, and energy conversion. The appendices include an abbreviated glossary, laboratory procedures, and units of measurement. (BB)