The AgroEnergien Mississippi Digestate Dryer is suitable for efficient, bonusworthy heat utilisation, for drying digestate to reach a dry matter content of max. 12%DM.

The structure of the digestate dryer is similar to the paddle wheel of the legendary Mississippi-steamboat.

With every rotation, the paddles on the back side of the dryer immerge into the digestate that is to be dried. While going through the digestate, it is homogenised, so that the buildup of floating layers, incrustations and sedimentary depositions is impossible.

On the front side of the digestate dryer, the paddles emerge from the digestate and carry a certain amount of the substrate, which is then dried in the airstream.

A heat exchanger, which is adjusted to the available amount of heat, is connected upstream of the digestate dryer. Cold external air is heated by flowing through ventilators connected upstream of the heat exchanger. After flowing through the AgroEnergien Mississippi Digestate Dryer, the damp and ammoniacal air is then cleaned in air purification system and finally escapes into the air.

• a basin filled with liquid digestate
• a rotor, consisting of blades that are fastened to the side of the paddle wheel (the components that come into contact with the digestate are made of stainless steel)
• gear motor with a demand of only 0.37kW! to power the  rotor
• a digestate pump to fill and empty the digestate 
• basinattachments such as piping, filling level probes, etc.
• measurements: paddle wheel d = 2,350mm, blades l = 2,800mm

• very efficient; the evaporation performance is about 1l per 1kWh (thermal)
• maximum concentration of nutrients in liquid digestate at the biogas plantvery low electrical power consumption; the gear motor has a connected wattage of 0.37kW
• extremely failure-free and low maintenance system operation, due to few moving parts
• minimal labour costs due to fully automated system operation
• low-cost and effective digestate drying