This publication will introduce you to processes and equipment for handling, treating and disposing of sludge produced by wastewater treatment plants. You will learn about sludge pumping, thickening, conditioning, dewatering, digestion, storage and final disposition. You will learn about loading parameters for gravity thickeners and operational parameters for air flotation thickeners. You will learn guidelines for chemical conditioning of sludges; and advantages, disadvantages and shortcomings of filter presses, basket centrifuges, and solid bowl decanter centrifuges. You will learn about design parameters for aerobic and standard and high-rate anaerobic sludge digesters.