||Filtration of Giardia cysts and other substances : Volume 2. slow sand filtration /
Bellamy, William D., ;
Bellamy, W. D. ;
Silverman, G. P. ;
Hendricks, D. W.
||Colorado State Univ., Fort Collins.;Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
|| National Technical Information Service, U.S. Department of Commerce,
Giardia lamblia ;
Drinking water--Standards--United States ;
Filters and filtration
Sand filtration ;
Microorganism control(Water) ;
Potable water ;
Particle size ;
Coliform bacteria ;
Sand filters ;
Field tests ;
||Some EPA libraries have a fiche copy filed under the call number shown.
||xxii, 305 pages : illustrations, charts, photos ; 28 cm
Slow sand filtration research was conducted at Colorado State University in two phases, using 1 foot diameter filters. Phase I results showed removal of Giardia cysts exceeded 99.9 percent for the three hydraulic loading rates used. The most important operating condition was the development of a biopopulation within the sand bed. Removals of total coliform bacteria related well to the development of the biopopulation within the sand bed showing, 90 percent removal for a new sand bed operated at 0.40 m/hr filtration rate, and 99.99 percent removal for a mature sand bed and established schmutzdecke operated at 0.04 m/hr. In Phase II removals of total coliform bacteria ranged from 60 percent for the filter maintained with no biological activity (e.g., chlorinated between tests), to 99.9 percent for the filter having nutrients added. Removal for the control filter removal averaged 97 percent.
Includes bibliographical references. "PB85-191633." "EPA/600/2-85/026." "April 1985." "Cooperative Agreement no. CR808650-02." "Project Officer: Gary S. Logsdon, Drinking Water Research Division, Water Environmental Research Laboratory."