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No description available.

This work was carried out to investigate the mechanisms of solid-solid separation in electrostatic precipitators. The separation of mixture of pure compounds from each other and the components of an industrial dust has been studied in a wire-and-duct type laboratory-scale electrostatic precipitator. Particle size distribution affected the separation most, but both the dielectric constant and electrical resistivity of the dust can be important. Operating voltage and air velocity in the precipitator also affected the separation along the precipitator length. The SRI computer model of precipitator performance gave reasonable predictions of separation under conditions of negligible re-entrainment. / An apparently unique relationship between separation and recovery was experimentally observed with components which do not re-entrain appreciably; a similar behaviour is theoretically predicted from the Deutsch Equation of collection efficiency or the SRI model.

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A new process was developed for the filtration of hydrophobic colloids without the assistance of chemical coagulants. The process consists of passing the suspension through a bed of electrically conducting granules which are fluidized by the upward flow of the suspension and simultaneously exposed to a D.C. electric field. The process was demonstrated on an aqueous polystyrene latex of mean particle size 0.34 (mu)m. At optimum conditions a bed of iron granules retained 98% of the entering particles. / Experiments showed that the following variables increased the retention: increasing electric field strength, increasing static bed height, decreasing electrical conductivity of the feed, and decreasing the superficial velocity. Retention was independent of inlet particle concentration. / A model of the process was formulated including various mechanisms of deposition and surface forces. It contained no empirical factors from filtration experiments except the mean particle size in the effluent when electric field is applied. / Electrocoagulation of the polystyrene latex was observed under the microscope and the mechanisms involved were elucidated.

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No description available.

No description available.

No description available.

No description available.