||Chemical Treatment of Combined Sewer Overflows.
||Dow Chemical Co., Midland, Mich.
||EPA-WQO-14-12-9; FWQA-11023-FDB; 07755,; 11023-FDB-9/70
( Sewage treatment ;
Combined sewers) ;
( Water pollution ;
Storm sewers ;
Pumping stations ;
Water analysis ;
Water quality ;
Water pollution control ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Less than 8% of the total sanitary sewage flow collected in the Milk River combined sewer has been by-passed during periods of storm overflow during the past 8 years. Total overflow volumes did not exceed 5.5 million cubic ft. 90% of the time. Initial BOD over 18 samples ranged from 23 mg/l to 376 mg/l with an average of 110 mg/l, while suspended solids averaged 249 mg/l. On final samples taken during the same period, BOD values averaged 42 mg/l and SS values averaged 67 m/gl. Chlorine demand for 56 influent samples averaged 7.7 mg/l. The receiving waters for these overflows were characterized by visual observation as being highly polluted. Cationic polymeric flocculants and flocculent aids were tested on combined overflows from the sewer system. It was found that the existing Milk River pumping station and retention basin were suitable for modification, namely the addition of weirs and variable rate pumping, to acheive an average SS removal of 63%. The installation of disinfection equipment was estimated to cost $20,625 with $7,700 annually for chemical costs. This equipment would produce a coliform density of 1000/100 ml at an average cost of approximately $.012/1000 gallons. (WRSIC abstract)
||Paper copy available from GPO $1.50 as EP2.10:11023FDB09/70.
|NTIS Title Notes
||Water pollution control research series.
|PUB Date Free Form