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# المحاضرة 4-5

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 4
أستاذ المادة محمد عبد مسلم عبد الله الطفيلي       04/07/2018 08:48:52
? v?_(c ) (SOR)= depth/(detention time)

Idealized discrete particle settling in three different types of settling basins is illustrated on Fig. S -1. Particles that have a velocity of fall less than v_c will not all be removed during the time provided for settling. Assuming that the particles of various sizes are uniformly distributed over the entire depth of the basin at the inlet, it can be seen from an analysis of the panicle trajectory on Fig. S - 2 that particles with a settling velocity less than v_c will be removed in the ratio:

? X?_(r )= ? v?_(p )/? v?_(c )
Where:
? X?_(r ) : is the fraction of the particles with settling velocity ? v?_(p ) that are removed.

Figure S-1
Definition sketch for the idealized settling of discrete particles in three different types of settling basins: (a) rectangular, (b) circular, and (c) up-flow

Figure S-2
Definition sketch for the analysis of ideal discrete particle settling

For a given clarification rate Q where:
?Q=A v?_c
only those particles with a velocity greater than v_c will be completely removed. The remaining particles will be removed in the ratio ? v?_(p )/? v?_(c ) . The total fraction of particles removed for a continuous distribution is given by :

fraction removed=(1-X_c )+ ?_0^(X_c)?? v?_(p )/? v?_(c ) dx

Where :
(1-X_c )=fraction of particles removed with v_(p ) greater than v_c
?_0^(X_c)?? v?_(p )/? v?_(c ) dx=fraction of particles removed with v_(p ) less than v_c

For discrete particles within a given settling velocity range, the following expression may be used:

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 .