Record Display for the EPA National Library Catalog
RECORD NUMBER: 17 OF 142
|OLS Field Name||OLS Field Data|
|Main Title||Comparison of some filtration processes appropriate for Giardia cyst removal /|
|Author||Logsdon, Gary S., ; Logsdon, G. S.|
|CORP Author||Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div.|
|Publisher||U.S. Environmental Protection Agency, Office of Research and Development, Water Engineering Research Laboratory,|
|Subjects||Drinking water--Purification. ; Giardia.|
|Additional Subjects||Water treatment ; Disinfection ; Filtration ; Sand filtration ; Microorganism control(Water) ; Water quality ; Flocculation ; Water supply ; Evaluation ; Giardia cyst removal ; Diatomaceous earth(DE) filtration ; Coagulation filtration|
|Collation||ii, 27 leaves : charts ; 28 cm|
Slow sand filtration, diatomaceous earth (DE) filtration, and coagulation-filtration (including conventional treatment, direct filtration, and in-line filtration), have been evaluated for Giardia cyst removal at pilot plant and/or field scale. Properly designed and operated, the above process can attain 99 percent cyst reductions, or higher. The paper discusses relative advantages and disadvantages of the proceses, and factors that may result in success or failure of treatment. Slow sand filtration may be the most appropriate for small systems if the raw water is treatable. DE filtration is very effective for cyst removal, but removal of very small particles requires use of fine grades of DE or chemical preconditioning of DE. Coagulation-filtration has the greatest flexibility, and can remove 30 to 50% of THM precursor; also turbidity, microorganisms, and metals that can be precipitated before filtration.
Cover title. "PB87-147211." "EPA/600/D-87/033." "January 1987." Includes bibliographical references (pages 21-24).