Coagulation of submicron colloids by supramicron silica particles
AuthorKebler, David George,1960-
Committee ChairBales, Roger C.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractValues of a (coagulation efficiency) for coagulation of aluminum (hydr)oxide colloids by supramicron silica particles were generally near 0.01. Although the freshly suspended particles were oppositely charged, dissolved silica from the particulate silica adsorbs to the colloids reversing their charge. Bicarbonate also adsorbs and shifts the pHiep of the aluminum (hydr)oxide colloids. The addition of dissolved Al(III) had a similar effect on both types of particles. Dissolved silica adsorbs to the hydrous aluminum oxide surface and undergoes ligand exchange. This exchange can be simulated by a constant capacitance model for adsorption of aqueous species to the oxide surface and fits laboratory titration data.
Degree ProgramHydrology and Water Resources