This publication covers a wide range of topics of interest to designers, operators and research workers in the field of wastewater treatment plants. The papers include numerous examples of practical applications of research work. The 33 papers are organized under the following themes: Sludge Bulking; Nitrification and Nutrient Removal; Activated Sludge Plant Efficiency; Secondary Settlement of Activated Sludge; Submerged Filtration; Anaerobic Treatment; Sludge Treatment and Disposal; Grit Removal; Environment and Energy Saving Considerations; Plant Design and Operation. This book is an invaluable source of information on modern developments in wastewater treatment and will assist in promoting the adoption of modern relevant technology for the solution of wastewater treatment problems.