Joined: 2/14/2010
Posts: 1
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Hi members ,
Please find below Sand filters data , i would like to know how did the designer arrived the Flow rate ( peak) value
No of Filters
16
Nos
Type
Rapid gravity sand filters ,
rectangular , layered media placed above lateral outlet tubes
Design flow
10,570
M3/day
Manufacturer
Ames crosta Babcock
Influent quality
25 mg/lit BOD /l , 30 mgSS/l , 5
mgNH3N/i
Effluent quality
Effluent quality 10 mgBOD/l , 10 mg
SS/l ( at peak flow)
Filter area
52.2
M2 each
Flow rate ( Peak)
7.38
M3/m2.h
Bed size
9 X 5.8 m
Each bed spilt into 2
Water level
2.1
M
Filter media
Grade ( 1/10-1/4” , 3/8 & 1/2 TO 3
/4 “ )
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Hi forum members ,
Volume of excess Sludge = (Q x BODin x Yobs x BODRE) ÷ MLSS
Where
Q Influent flowrate m3/d
BODinInfluent BODKg/m3
Yobs Observed yield coeficient %
BODRE BOD removal efficiency %
MLSS Mixed liquor suspended solidsKg/m3
I was told that the above equation can be used to determine the sludge wasting for a Activated sludge plant.
I would like to know the following
Is it applicable to all types of ASP plants
The source of this equation ( any books references etc.,)
OR is there any other method available
can any one share views with me
regards
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