The EAD press has been tested successfully on a variety of materials including apple pomace, corn gluten, sewage sludge, and coal fines. The ultrasonic fields help electro-osmosis by consolidation of the filter cake and by release of inaccessible liquid. Electro-osmosis is caused by an electrical double layer of oppositely charged ions formed at the solid liquid interface, which is characterized by zeta potential. The dominant mechanism of sludge dewatering by EAD press is electro-osmosis due to the application of a direct current field. This press is utilized after conventional dewatering devices and can remove up to 50% water from filtered sludge cake at a fraction of the cost incurred in existing thermal drying devices. The EAD press applies a combination of mechanical pressure, electrical current and ultrasonics. ![]() The Department of Energy, Battelle Institute, and Ashbrook-Simon-Hartley, have jointly developed an Electro Acoustic Dewatering press (EAD press). Application of electro acoustic principles for dewatering has been developed by Battelle Institute.
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