GB709174A - Apparatus for clarification treatment of solids-carrying liquids - Google Patents

Abstract

709,174. Treating sewage ; softening water; gravity-separation apparatus. DORR CO. Sept. 24, 1952, No. 23947/52. Classes 46 and 111 Apparatus in which a clarification compartment surrounds a flocculation (or equivalent) compartment, and such as is exemplified in Specification 532,002, is characterized chiefly in that the bottom of the central compartment is at a lower level than that of the surrounding clarification compartment. Scrapers 36 operating on the bottom of a clarification zone Z2 are suspended directly from a truss arm 25 driven by a motor 29, and scrapers 34 operating on the bottom of a flocculating zone Z1 are attached to a cage 30 surrounding, and rotating upon a thrust bearing 31 on the top of, a central feed pier 13. The inner end of the truss 25 is connected to the cage 30 and thus to the bearing 31. Upstanding from the scraper arms 32 and 33 are paddle members 37 and between them are rotated at a greater speed paddle members 38 depending from arms 42 and 43 secured to a cage structure 41 mounted on a bearing 40 on top of the cage 30 and driven through a bevel gear 50 by a pinion 49 driven in turn by a motor 44 on the truss 25. Liquid fed into the pier 13 flows outwards at its top and passes downwards into the flocculation zone proper, defined generally by the overlapping portions O of the paddle members and, at the bottom, also by a radial shelf 23. Some solids settle ; the liquid carrying the remainder passes through slots 19 into the clarification zone Z2 from which clarified liquid overflows at E. Solids from both zones eventually reach a sump 24. In Fig. 1a (not shown) the paddles are dispensed with and, instead, radial perforated aerating pipes are suspended from the truss 25 in the inner compartment and are fed by a motor-driven blower located on the truss arm 25.