Sewage disposal . Screens. The drum type of screen was first used byMetzger of Bromberg and was later, according to Allen (1915),improved and patented by Windschild. The sewage enters oneend of a cylindrical drum which has its curved portion made upof perforated plates. The sewage passes out through theseperforations while the screenings are carried upward by the ro-tation of the drum, being prevented from falling, till they reacha can hopper or conveyer near the top, by a curved guide materials are removed by an air jet delivered from a DRUM SCREENS 75 swinging nozzle on the ex
Sewage disposal . Screens. The drum type of screen was first used byMetzger of Bromberg and was later, according to Allen (1915),improved and patented by Windschild. The sewage enters oneend of a cylindrical drum which has its curved portion made upof perforated plates. The sewage passes out through theseperforations while the screenings are carried upward by the ro-tation of the drum, being prevented from falling, till they reacha can hopper or conveyer near the top, by a curved guide materials are removed by an air jet delivered from a DRUM SCREENS 75 swinging nozzle on the exterior. Allen (1915) describes studieson the operation of these screens at Bromberg, Mainz, Trier,and Osnabriick. The most interesting revolving screen which has been designedin the United States is a screen of the drum type installed atReading, Pa., by 0. M. Weand (Hering and Fuller, consult-ing engineers for the plant). This screen, called by the de-signer a segregator, consists in its improved form of a cylin-. Fig. 18. General View of Reading Screen. drical iron framework about 6 feet in diameter and 16 feet clamped to this framework is a brass wire (No. 12 gage)screen having a f-inch mesh. This serves as a support to thebrass wire cloth, having 40 meshes to the inch, which constitutesthe screening surface. The latter is installed in segments whichcan be readily replaced as needed. The apparatus shown in Figs. 18-20 is placed in a pit adja-cent to the engine room of the station where the sewage ispumped to the purification works. The sewage from the mainsewer is discharged through a 24-inch pipe into the barrel of thescreen and passes outward through the wire cloth to the bottom 76 SCREENING AND STRAINING GF SEWAGE \ \ Chain to Line Shaft
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1919
