Sludge dewatering is the removal of water from wastewater treatment solids slurry (sludge) in quantities greater than what is achieved by thickening. Mechanical processes and land dewatering techniques are detailed to aid in selecting the most appropriate method for the sludge under consideration. One major reason for dewatering is to decrease the capital and operating costs for final sludge disposal. Dewatering sludge solids from a 1 to a 20 percent solids concentration reduces volume by three-fourths and generates a cake-like material that has a non-fluid consistency.