The digestion process is an important sludge management practice used for sludge stabilization in wastewater treatment. Aerobic digestion is the most widely used stabilization process in plants with average flows less than 5 MGD.

The anaerobic digestion process is an important sludge management practice used for sludge stabilization in wastewater treatment. Anaerobic digestion is the most widely used stabilization process in plants with average flows greater than 5 MGD.

The storage of biogas that is being generated from the anaerobic digestion process is one way that municipalities reduce energy costs and reduce the quantity of greenhouse gases being emitted to the atmosphere.

Biosolids must be dewatered before they can be beneficially reused. Biosolids are often just 3-5 percent solids, so removal of the water from the material is essential to reducing weight and the cost of further treatment or disposal or reuse.

Biosolids are the nutrient-rich organic materials resulting from the treatment of domestic sewage at a wastewater treatment facility.

The treatment process a wastewater facility employs to stabilize the wastewater solids will result in either Class A or Class B biosolids, depending on the methods used.

Thickening of sludge increases its solids content and reduces the volume of free water thereby minimizing the unit load on downstream processes such as digestion and dewatering.