The heart of the plant is made of glass lined steel (standard system) or stainless steel (compact system)
The sludge flows through the digester from the bottom to the top forming a plug flow. An automatic discharge system at the floor level allows for continuous operation without needing to periodically empty the digestion chamber for sediment removal. The impulse pump, together with the perforated sheets, ensures a gentle local mixing of the sludge bed.
Characteristic and Advantages of HPD