This manual was prepared for the purpose of stimulating the development of effective unit operations and unit processes laboratory courses in environmental engineering. Laboratory activities emphasizing physical operations, biological, and chemical processes are designed for various educational and equipment levels. An introductory section reviews coordination of laboratory experimentation by students, submission of laboratory reports, and laboratory rules and safety regulations. Experiments, submitted and reviewed by both academic and professional practitioners, are suggested in the following areas: coagulation and flocculation, mixing and reactor hydrodynamics, sedimentation, filtration, vacuum filtration, flotation, disinfection, chemical oxidation and reduction, corrosion and corrosion control, water stabilization, chemical precipitation, adsorption, ion exchange, membrane processes, heat transfer, gas transfer, biological oxidation (batch systems), and biological oxidation (continuous systems). Each experiment outlines background information, objectives, procedure, analysis, problems and questions, references, apparatus, and materials required. Data sheets, charts, and diagrams are provided when necessary. (BL)