||Municipal Sewage Treatment with a Rotating Biological Contactor.
||Allis-Chalmers Mfg. Co., Milwaukee, Wis. Research Div.
||FWPCA-14-12-24; 10655,; 17050-DAM-05/69
( Sewage treatment ;
Biochemical oxygen demand ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The Milwaukee Metropolitan Sewerage Commission installed a rotating biological contactor (RBC) to treat municipal sewage. The RBC obtained in excess of 90% BOD removal at loading rates of 350 to 400 lbs COD per day per 1000 cu. ft. of disc volume. Nitrogen was shown to be removed in a ratio of 1:25, nitrogen to COD. Percent BOD removal was consistently 5% greater than percent COD removal. Treatment efficiency was increased with increased detention time, and decreased by: (1) lower disc speed; (2) lower strength wastes; and (3) high hydraulic loading. Recovery from periods of high hydraulic loading was extremely quick. Further planned investigations included isolation and identification of individual species of microorganisms and comparison with the microorganisms of activated sludge and trickling filters. (WRSIC abstract)