Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Screening/Flotation Treatment of Combined Sewer Overflows.
Author Maso, Donald G. ; Gupt, Mahendra K. ;
CORP Author Rex Chainbelt, Inc., Milwaukee, Wis. Ecology Div.
Year Published 1972
Report Number DI-14-12-40; EPA-11020; 11020-FDC-01/72;
Stock Number PB-215 695
Additional Subjects ( Flotation ; Overflows) ; ( Disinfection ; Overflows) ; ( Size screening ; Overflows) ; ( Sewage treatment ; Overflows) ; Combined sewers ; Chlorination ; Ultraviolet radiation ; Flocculating ; Biochemical oxygen demand ; Design ; Capitalized costs ; Operating costs ; Performance evaluation ; Oxidation ; Ozone ; Water pollution control
Library Call Number Additional Info Location Last
NTIS  PB-215 695 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 173p
The report documents a study to develop a treatment system for combined sewer overflows. The processes of chemical oxidation, screening, dissolved-air flotation, and disinfection were evaluated in the laboratory. A 5 MGD demonstration system was designed, installed and evaluated. Suspended solids and volatile suspended solids removal in the range of 65-80% were consistently obtained at influent concentrations of 150 to 600 mg/l. BOD and COD removals were slightly lower at 55 to 65% for influent concentrations of 50 to 500 mg/l. Addition of chemical flocculents (ferric chloride and a cationic polyelectrolyte) was necessary to obtain these removals. Without the use of chemical flocculents, removal of BOD, COD, suspended solids, and volatile suspended solids were all in the range of 40-50%. The screening flotation system provided sufficient detention time (difference 15 minutes) for adequate disinfection with hypochlorite salts. Cost estimates are presented.