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Design of Sedimentation Basins

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 3
أستاذ المادة جبار حمود عبد النبي البيضاني       09/07/2018 08:32:55
Sedimentation basins , as noted, will always have a detention time somewhat less than the nominal value and a surface overflow rate somewhat higher than nominal as a result of nonideality of the of the flow pattern. Design of sedimentation basins is directed toward reducing the degree of nonideality.
Sedimentation tanks may be rectangular or square. In rectangular basins, the is directed along the long axis. This flow pattern minimizes the effect of inlet and outlet disturbances. Sludge removal equipment in such basins consists of horizontal scrapers which drag the solids to the hopper at one end, from which they are removed intermittently or continuously by gravity or augers. Typical designs are shown in Figures below. Vacuum or siphon devices may be used to remove sludge from clarifiers, but such devices are best suited for very light flocculent sludges such as those encountered in biological wastewater treatment processes. Rectangular basins offer certain economies in construction if common wall design is used. Square basins are occasionally used for clarifiers.Their flow pattern is not as desirable as that in rectangular designs, and the sludge removal equipment is more complicated. Square basins generally employ rotating scrapers similar to those in circular clarifiers with an additional corner sweep mechanisms similar to that shown in figure below.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .