File:Sewage disposal (1919) (14777748314).jpg

Identifier: sewagedisposal00kinn (find matches)
Title: Sewage disposal
Year: 1919 (1910s)
Authors: Kinnicutt, Leonard P. (Leonard Parker), 1854-1911 Winslow, C.-E. A. (Charles-Edward Amory), 1877-1957 Pratt, Robert Winthrop, 1876-
Subjects: Sewage disposal Public health Sewage disposal Sewage
Publisher: New York : John Wiley & Sons, Inc. London : Chapman & Hall, Limited
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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the bottom amounts to 1918pounds of dry matter per million United States gallons of sew-age treated and the cost of removing and burying it is about 14;cents per million gallons of sewage treated (Watson, 1907). Thetanks are capable of effecting a reduction in suspended solidsfrom 291 parts per million (the septic effluent value) to 61 partsper million; and as a matter of fact they did.reduce the sus-pended matter in 1907 from 242 to 97 parts; and the total cost isabout 20 cents per million gallons. The total amount of dry solid matter removed from the sew-age is 67 long tons per day, or 1170 tons of liquid sludge con-taining 94.5 per cent water. At first the sludge was spread in great shallow lagoons andallowed to dry sufficiently to be dug into the ground. Thismethod was changed by discharging the sludge into trenches3 feet wide and 18 inches deep, and covering it over with earthas soon as practicable. In 1907 the sludge was pumped to a 362 TREATMENT IN TRICKLING OR PERCOLATING BEDS
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TRICKLING FILTERS IN ENGLAND AND GERMANY 363 field surrounded by earthen embankments 10-20 feet high, andalthough about 2 acres of this area were covered with sludge to adepth of 8 feet, and rapid decomposition of the organic matterwas going on, as shown by the amount of gas continually evolved,no strong odor was noticeable from the adjoining banks. The trickling beds at Sutton Coldfield occupy 30 acres. Thebeds are 1, 2 and 3 acres in area, with the exception of somequarter-acre and half-acre beds built for experimental purposes.The larger filters are rectangular in shape, with side walls ofrubble, laid dry, and floors of concrete, with a fall of about 9inches across the bed. Over the concrete is an aerating floorof semicircular stone-ware tile, laid with loose joints. Thefilling material is 6-7 feet deep and consists of broken brick,slag, granite or quartzite f to 2 inches in diameter. Watsonsexperiments led him to the conclusion that the nature of thefilling used was immaterial, so

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