DESIGN OF FINAL CLARIFIERS IN ATV 131
DESIGN OF FINAL CLARIFIERS IN ATV 131
FC design is based on R = 0.75 and Qwwf.Diluted Sludge Volume =
DSV =
in which tTh = Thickening time
Assume 1 m3 of volume in FC over the sludge accumulation
zone.
ml of sludge vol in 1 m3 of FC liquid over
sludge collect. zone.
qSV = Sludge Volume Surface Loading = qA . DSV
Depths (h) are measured at 2/3 of radius from center.
h1 = clean water zone = 0.5
Q in m3/h, tR = 0.5h
h3 = Storage zone = volume to store additional volume of sludge:
(0.3X . SVI) with a concentration value of 500 L/m3 expolled in 1.5
h from aeration tank.
h4= Thickening and sludge removal zone
ie. Enough volume (Ah4) to thicken X to XR.
Design of FCs in ATV 131
hinlet disturbance zone = hside ( 2.5 m
hin
0.5 m
h1
h2
h at 2/3 raduus
ATV-131 FINAL CLARIFIER DESIGN
Input
Surface Load
hside(2.5m
h3
Q
tTH = 1-1.5h w/N
tTH =
R=0.75, QR = (0.75-100) Q
TTh=3h
SVI=100
Solve for XR ( EMBED Equation.3
XR = 0.7.(XBS)
XBS=Final Clarifier Bottom Sludge X
qA = 1.16 m/h < 1.6 m/h
EMBED Equation.3
Input
Number of Final Clarifiers
EMBED Equation.3
DSV = Diluted Sludge Volume
DSV( ml sludge vol/m3 mixed liquor
EMBED Equation.3
(= sludge volume concentration, ml/ml
EMBED Equation.3
qsv =Sludge vol-surface load must be ( 0.5 m/L
Check
EMBED Equation.3
Clear water zone
h1 = 0.5 m
Seperation zone
EMBED Equation.3
EMBED Equation.3
Storage zone
Note that in creasing QR, increases depth
EMBED Equation.3
Thickening zone
htot = h1 + h2 + h3 + h4
Print Q, R, QR, tTh, SVI, XR, DSV, (, qA, qSV, h1, h2, h3, h4,
htot
Dosya Ad: Design of Final Clarifiers in ATV-131
03.02.2014
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