WEF Discussion Forums : Operation and Maintenance : Sand filters Flow rate peak cals.....

 

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 “ )

 


]]> Sun, 14 Feb 2010 08:20:48 GMT  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


]]> Tue, 23 Feb 2010 06:45:11 GMT