Flocculation of wastewater with polyelectrolytes and ferric chloride
AuthorWalding, Clifford Don,1945-
Committee ChairKasper, Dennis R.
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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.
AbstractThe flocculation of raw municipal wastewater using ferric chloride and synthetic organic polyelectrolytes is affected by both chemical and physical process variables. The variables studied include flocculant types and dosages, suspended solids concentrations, sequence of chemical additions, time of mixing, and mixing intensities. Raw wastewater can be efficiently and economically flocculated with a combined chemical system of ferric chloride and a polyelectrolyte. When used following ferric chloride, anionic polymers were observed to perform better than cationic or nonionic types at equivalent dosages. The combined chemical system increases floc settling rates above those observed when no chemicals are used or when ferric chloride is used alone. Capital savings resulting from increased floc settling rates can offset a large portion of the chemical costs. A bench scale modified jar test was developed to provide greater sensitivity than conventional jar tests to initial floc settling rates.
Degree ProgramCivil Engineering and Engineering Mechanics