. The sanitation of cities. e conclusion that a complete biologicalmethod of sewage treatment had been dis-covered, which was effected by anaerobic bac-teria. Further studies resulted in the so-calledseptic tank. Much was claimed for this tank,but it actually accomplished very little. Thetanks at Columbus, Ohio, and at Baltimore, wereamong the largest of this type. The latter con-tinue in service, the sludge being taken from thembefore the septic process is complete, and carriedto completion in separate digestion tanks. Theseptic tank generally caused bad smells. Sewageran through it continuou
. The sanitation of cities. e conclusion that a complete biologicalmethod of sewage treatment had been dis-covered, which was effected by anaerobic bac-teria. Further studies resulted in the so-calledseptic tank. Much was claimed for this tank,but it actually accomplished very little. Thetanks at Columbus, Ohio, and at Baltimore, wereamong the largest of this type. The latter con-tinue in service, the sludge being taken from thembefore the septic process is complete, and carriedto completion in separate digestion tanks. Theseptic tank generally caused bad smells. Sewageran through it continuously with a detention dueto the size of the tank, varying from 8 to 24 79 Ebe Sanitation of Citiee hours. Some tanks were covered, and someopened at the top; a heavy scum of floating mat-ter and grease covered the surface of the sewage,and helped to prevent the escape of foul smells;but much of the hydrogen sulphide and othergases was carried out of the tank with theeffluent, which was foul, black and highly putres-cible. 80. NEW YORK CITY, N. showing proposed number and location of district or divi-sional sewage treatment plants (indicated by black symbols)suggested by the Metropolitan Sewerage Commission 8i ilinimiii
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Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400497, bookyear1921
