The following diagram illustrates the operation of a rapid sand filter. Washwater storage tank Water level while filtering E A From coagulation larification bas Sand + Gravel OOO OO Filter rate controller B CO D Water level while washing H B Scai Bottom of washwater trough Washwater rate controller E Lateral drain Filtered water Main drain storage tank Washwater drain The Valve D is to O 1) Control influent water from sedimentation tanks O2) Discharge dirty backwash water 3) Discard the initial filtered water after backwashing and resuming filtration 4) Control the clean backwash water 5) None of the above
The following diagram illustrates the operation of a rapid sand filter. Washwater storage tank Water level while filtering E A From coagulation larification bas Sand + Gravel OOO OO Filter rate controller B CO D Water level while washing H B Scai Bottom of washwater trough Washwater rate controller E Lateral drain Filtered water Main drain storage tank Washwater drain The Valve D is to O 1) Control influent water from sedimentation tanks O2) Discharge dirty backwash water 3) Discard the initial filtered water after backwashing and resuming filtration 4) Control the clean backwash water 5) None of the above
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter8: Landfills
Section: Chapter Questions
Problem 8.9P
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Transcribed Image Text:The following diagram illustrates the operation of a rapid sand filter.
Washwater
storage tank
Water level
while filtering
E
A
From coagulation
larification basi
2
00
Water level
while washing
Filter rate
controller
E
Lateral drain
Filtered water
storage tank
Main drain
Washwater
drain
The Valve D
is to
O 1) Control influent water from sedimentation tanks
O2) Discharge dirty backwash water
3) Discard the initial filtered water after backwashing and resuming filtration
4) Control the clean backwash water
5) None of the above
B3
Seal
Sand
Gravel
0 0 0 0 0
Caf
Bottom of
washwater
trough
Washwater rate
controller
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