Laserfiche WebLink
z� <br />FIG. 8•7 Settlfng•velocity <br />curva for Example 8•2. <br />� <br />rk <br />� u <br />s� <br />� <br />8$ <br />� N <br />�� <br />OL <br />R <br />IL <br />Setllinp vel0tity V�, ipm <br />solution <br />Draw the settling-�•elocity analysis curce as _=hon•n in Fig. 3•7. <br />Compute the settling �•elocity V� oE the particles that n•ill be <br />completely remo�•ed n•hen the rate of clarification is 100,000 <br />gpd/sq ft. <br />v` � 100,000 gpd x 1 mgd x 1.5�7 efa x 60=ec a 9.3 fpm <br />sq ft 10' gpd mgd min <br />From the cun•e it ie tound thst 0.55 of the perticles hare n eettling <br />celocity less than 9.3 tpm. The graphical integretion of the eecond <br />term in Eq. 8•20 is shon•n on the cun•e as n series ot rectangles <br />(shaded) and in the fo]loating tebulation. (�'ote that since V, is <br />constant it is taken outside the integral or summation sign.) <br />dz <br />0.05 <br />0.13 <br />0.10 <br />0.09 <br />a.o� <br />0.07 <br />0.0/ <br />0.55 <br />V, <br />c.i <br />o.e <br />1.1 <br />1.7 <br />z.e <br />5.2 <br />H.3 <br />V, ds <br />0.� <br />o.ia <br />0.110 <br />0153 <br />0.1� <br />0.361 <br />0.332 <br />1.279 <br />Fraction removed �(1 — R,) -{- j� ET',dx <br />i.il9 <br />� �i — o.ss� + s.-3 = o.ssa <br />Wasteweter Engineertng: Coliection, freatment, Disposal <br />:�. <br />t:'s; <br />TYPe•2 Settling <br />Particles in relaticely dil' <br />particles but �cill conle� <br />flocculation occurs, the r <br />faster. The extent to �c <br />opportunity for contnct. <br />of the basin, the velocity <br />particles, und the rnnge <br />can be determined only I <br />To determine the se <br />lent particles, a settling � <br />any diameter but shoulc <br />posed tank. Sntisfactor�• <br />plastic tube about 10 ft <br />2-ft intervals. The soluti� <br />introduced into the cohu <br />of particle sizes occurs fr <br />Care should ulso be <br />maintained throughout <br />Settling should tnke plac <br />intervnls, samples are � <br />suspended solids. The p <br />anal}•zed, and is plotted : <br />tiona aze plotted on a su <br />of equal percent removal <br />af a sedimentution test a <br />_ �l Semplinp <br />OO�Is h� <br />:4 <br />�4 <br />}:'' <br />:h�. <br />4�. <br />S <br />0 <br />h� <br />FIG, 8•8 SetUfng column . nd a <br />