It is possible to apply electroosmosis to dewatering of sludge.
In this paper, the mechanism of electroosmotic dewatering of compressible sludge under condition of constant electric current was discussed, based on the model of electroosmotic flow through the particle packed bed, and the effects of the operating conditions on the rate of electroosmotic dewatering and the electric power consumption were theoretically analysed. The equations obtained theoretically were confirmed experimentally under condition of constant electric current with the compressible sludges such as white clay, magnesium hydroxide and bentonite. Theoretical equations were available for the design of electroosmotic dewatering apparatus. The electroosmotic dewatering was particularly effective for gelatinous sludges.