Browsing by Author "Cheng, Kwok-shun"
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Item Delayed cake filtration(1979) Cheng, Kwok-shun; Tiller, Frank M.; Crump, Joseph R.; Payatakes, Alkiviades C.; Clifford, Dennis A.; Matson, James A.; Luss, DanIn delayed cake filtration, mechanical agitation is used to limit cake formation. Maintenance of a thin cake results in larger flow rate/ area than encountered in conventional filtration. The particles are retained in suspension instead of being deposited; the process is similar to cross-flow, filter thickening. In batch operation, torque on the agitator increases as the slurry becomes more concentrated and ultimately becomes very large at a critical volume fraction of solids. The critical volume factor depends on particle shape among other factors. In this investigation, a laboratory filter equipped with an impeller was used to study the factors which determine the filtration rate. Those factors which were evaluated include pressure, viscosity, rotational speed, solid concentration, clearance between the blade and medium surface, and the type of medium. It was found that the filtrate rate was largely determined by the extent of particle build-up on the medium surface and the solid content of the slurry. Empirical equations for correlating filtration rate to the variables studied were developed.