||Screening/Flotation Treatment of Combined Sewer Overflows.
Maso, Donald G. ;
Gupt, Mahendra K. ;
||Rex Chainbelt, Inc., Milwaukee, Wis. Ecology Div.
||DI-14-12-40; EPA-11020; 11020-FDC-01/72;
( Flotation ;
( Disinfection ;
( Size screening ;
( Sewage treatment ;
Combined sewers ;
Ultraviolet radiation ;
Biochemical oxygen demand ;
Capitalized costs ;
Operating costs ;
Performance evaluation ;
Water pollution control
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||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.
||Paper copy available GPO $1.50 as EPI.16:11020FDC-01/72.
||Describes the development of an overflow treatment system based upon chemical oxidation, screening, dissolved-air flotation, and disinfection.
|NTIS Title Notes
||Water pollution control research series.
|PUB Date Free Form
||13B; 68D#; 91A#