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This comprehensive text serves as both a detailed reference and a unified course on wastewater treatment, aimed at scientists and engineers. It delves into the environmental and biological aspects of treating wastewater and disposing of sludge. The book begins by examining the nature of wastewaters and their oxidation in natural environments, then explores how natural principles are applied in specialized reactors for waste treatment. The role of microorganisms, their kinetics, metabolism, and types are discussed.