✓ Placed after a mixing pit or between two digestion tanks
✓ Simplicity
✓ Robustness
✓ Ideal for fibrous or large particle size materials
✓ Used in line or positioned on a pre-ditch
✓ Possible addition of a loading hopper
✓ Allows processing of materials
category C3
✓ Grinding required upstream
✓ Different tank sizes possible
✓ Heating with biogas, fuel oil or natural gas
✓ Heat recovery to preheat inputs or heat digestion tanks
✓ Can be installed upstream or downstream of digestion