Owing to the relatively low energy consumption rate re-Filtration followed by expression characteristics of cationic polyquired by compression compared with thermal dewatering mer conditioned clay slurries are reported for the first time in this methods, it is widely employed in industries to separate work. As the polymer dosage increases, the resistance to filtration liquid from cake by mechanical pressure (5). A major appligreatly decreases until a specific dose has been reached, where the cation relates to water and wastewater sludge treatments. zeta potential is close to zero. And further increase in polymer Yeh (6) and Tong (7) have provided a brief literature redose conversely raises the resistance. The expression data are interview. Heij et al. (8) report the application of expression to preted by the Terzaghi-Voigt combined model, from which the sludges. model parameters are evaluated. The polymer conditioning has
Over the past three decades, most of the research on cononly a mild effect on the primary consolidation process but has, however, a considerable influence on secondary consolidation stant-pressure expression has been accomplished by the Japcharacteristics. When zeta potential changes from negative to posianese investigators, Shirato and Murase (9-14), and by tive, both the easiness of creeping of constituent particles within Tiller of Houston University (5). Investigations of constant the sludge cake and the fraction of moisture removal by the secpressure provide basic understanding of the detailed mechaondary consolidation attain a maximum. The optimal polymer nisms involved and of the implications for sludge characterdose criterion considering the filtration and expression stages sepaistics.
rately, or in combination, is α§ 1997 Academic Press
In water and wastewater sludge dewatering operations,