222 W MARINE VIEW DR 2016-01-01 MF Import

[ty V� �cill settle to the :ction time, and basin cs•1�) be included to allow for ; circuiting, sludge stor- :tion o[ sludge-removal 'hap. 11. The discussion the factors are omitted. ; sho��•n in FiB. 3•5. Par- nill not all be removed ng thet the particles of the entire depth of the sis of the particle trajec- •elocity less than Ve p'IIl (8•1S) settling velocity V� that �etter, s large gradation iciency of removal for a der the entire renge of ; can be accompliahed in drometer tests combined :nn. Nith either method, �structed from the data. panicl� nslenory —DhcieU seW��9�'1 aosal <> ; ,� �; a$ o� .� ? 9 � LL � senrog vNodn FIQ.6•6 SettlinQ-velocity anal• yzis curve tor diserete p�rticles. For a given clnrificstion rate Q��here Q=V,A ze7 (3•19) only those partides ��ith s�•elocity greeter thnn V< «'ill be completely removed. The remaining particles �eil! be removed in the ratio Vy/Y�• The total fraction of pnrticles remo�•ed is viven by Eq. S•20. Fraction remo��ed �(1 — X<) -�- �X� j�� dz (S•20) �chere 1— X, = fraction of particles n•ich •.elocity V, greater than V, IX' �' �= frnction of pnrticles removed �cith V, less than V. The follo��ing e�ample illustrates thc use ot Eq. S•20. E%AMPLE t•2 Removaf of Disc�ete Panicles (Type•I Settlinp) ;= I A particle size diatribution has been o�tained irom a sieve enalyais oE sand particles. For each �•eight traction, an average =_ettling �•elocity hae been calculated. The data nre Satllfn8 velxity. leet per mtnuta (fpm) 30.0 Weightirectionrameining 0.55 5.0 2.0 1.0 0.15 0.5 p,qfi 0.35 0.21 0.11 0.03 \Vhet is the overall remoeel for an occrHo«• rate of 100,000 6Pa/59 [tZ Physlcal Unit Operations