Processing involves steps in which microorganisms decompose and transform the sewage.
In later stages, the solids are separated from waste water. Treatment reduces the quantity of solids generated by a facility and allows waste water to be further treated before being discharged as clean water. Biosolids are a source of plant nutrients similar to dairy, beef, or poultry manure. The Utah Department of Environmental Quality, Division of Water Quality, regulates biosolids to minimize health and environmental risks. Treatment facilities use various processes to render the biosolids safe for beneficial uses.