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Article
June 12, 1915

RECENT METHODS FOR THE TREATMENT OF SEWAGE BY "ACTIVATED SLUDGE"

JAMA. 1915;LXIV(24):1992-1993. doi:10.1001/jama.1915.02570500040020
Abstract

Experiments on an entirely new method of sewage treatment have been made during the past year in England, and are being continued in both England and the United States. The new process is known as the "activated sludge process" of sewage oxidation and sedimentation. Its significance may be made clear by a brief description of a typical sewage treatment plant making use of most of the advances in the art prior to the advent of the activated sludge experiments.

The city of Baltimore has constructed and is now operating in part one of the largest sewage treatment plants in the United States. Roughly, this plant includes about 6 acres of preliminary sedimentation tanks, varying from 13 to 25 feet deep; 30 acres of coarse stone sprinkling filters, about 8½ feet deep, and about 3 acres of final sedimentation tanks. The preliminary sedimentation tanks remove most of the settleable solids from

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