. Engineering and Contracting. economical method, and then to de-sign the purification works accordingly. TheCity Council appropriated $16,000, a sewagetesting station was built and operated fromAug. 16, 1904, to July 30, 1905, and the Reporton Sewage Purification at Columbus, Ohio,1905, by George A. Johnson, Assoc. M. C. E., is now a classic. The indications of the experimental work,namely, that, under the local conditions, theColumbus sewage could be treated most satis-factorily and economically in a purificationworks comprising septic tanks, sprinkling fil-ters and settling basins,
. Engineering and Contracting. economical method, and then to de-sign the purification works accordingly. TheCity Council appropriated $16,000, a sewagetesting station was built and operated fromAug. 16, 1904, to July 30, 1905, and the Reporton Sewage Purification at Columbus, Ohio,1905, by George A. Johnson, Assoc. M. C. E., is now a classic. The indications of the experimental work,namely, that, under the local conditions, theColumbus sewage could be treated most satis-factorily and economically in a purificationworks comprising septic tanks, sprinkling fil-ters and settling basins, and this method wastherefore adopted. While the investigationshowed that satisfactory results could be ob-tained by preliminary clarification and subse-quent filtration through sand, it also showed,for the first time in the United States, thatsprinkling filters could be operated in a north-ern climate and produce a satisfactory effluentat less cost than any other type of filter. 130 ENGINEERING-CONTRACTING Vol. XXXIII. No. Fig. 3—General Plan of Sewage Purification Works. Brief Outline of Works.—The preliminaryinvestigations made by Messrs. Griggs, Al-vord and Hering, and subsequent ones madeby the engineering organization, indicated thatit would bt most advisable and economicalto build and operate one purification worksrather than two, and that the most feasiblesite for the works was on the Scioto Riversouth of the city. Briefly stated, the dry-weather flow of thewhole city is brought to one point, where apumping station, known as the Main SewagePumping Station, has been built. To accom-plish this result, it has required the construc- tion of a small pumping station near AlumCreek, known as the East Side Sewage Pump-ing Station, where the sewage from the EastSide Sewer District is intercepted and pumpedthrough a force main discharging into theupper end of one of the main sewers in theIntercepting Sewer District, the extension ofthe intercepting sewer across the Scioto
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