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Grit is a major problem within the anaerobic digestion tanks for both food waste and sewage sludge. This type of material can include eggshells, bone, lime, ash, glass and various other inert high-density materials. Grit settles in the digester, reducing the capacity of the tank and therefore decreasing the digester’s efficiency.
Digesters require regular cleaning to increase the retention time of bio-solids in the tank as well as reduce the costs of heating it. Removing grit increases digestion and the life of the sludge pumps and other parts.