ACOUSTIC AND ELECTROACOUSTIC METHODS OF DEWATERING AND DRYING

Abstract

Interesting results have been observed in applying acoustic energy to dewatering and drying materials. However, drying by acoustic energy alone is expensive, energy intensive, and at best can be justified only in applications where rapid drying is necessary to preserve a product, the product is heat sensitive and its value justified the cost. However, synergistic effects have been observed when acoustic energy has been used with electrophoresis and electro-osmosis to dewater materials. An electroacoustic dewatering (EAD) technology has been developed in recent years that indicates good economic potential and an effectiveness that exceeds most conventional methods of dewatering. Very good results have been obtained from laboratory studies using the techniques with fine coal slurries, food products, municipal sewage sludges, and many other products.