Abstract
Sludge cakes sampled at various positions and times in an electroosmosis‐dewatering chamber were analyzed using microtome‐slicing techniques. The flocs accumulated at the anode due to the electrostatic attraction. The porosity continued to decrease as most of the biomass coagulated into large clusters. During the constant‐rate period of moisture removal, the morphological differences between the cakes at the two electrodes were less significant. During the falling‐rate period, a relatively large difference in cake porosity appeared between the electrodes, involving difference in pore size, porosity, Sierpinski fractal dimension (D SC), and pore boundary fractal dimensions (D B).
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