Environmental Engineering Reference
In-Depth Information
3
)
Screenings (ft
3
Screenings Removed (ft /day)
=
(5.3)
Days
3
Screenings (ft
)
3
(5.4)
Screenings Removed (ft /MG)
=
Flow (MG)
Example 5.3
Problem:
A total of 65 gal of screenings is removed from the wastewater
flow during a 24-hr period. What is the screenings removal reported as
ft
3
/day?
Solution:
First, convert gallons screenings to cubic feet:
65 gal
7.48 gal/ft
3
=
8.7ft
screenings
3
Next, calculate screenings removed as ft
3
/day:
3
8.7ft
1day
3
Screenings Removed
=
=
8.7ft day
Example 5.4
Problem:
During one week, a total of 310 gal of screenings was removed
from the wastewater screens. What is the average screenings removal in
ft
3
/day?
Solution:
First, gallons of screenings must be converted to cubic feet of
screenings:
310 gal
7.48 gal/ft
3
=
41.4 ft
screenings
3
3
41.4ft
7
3
Scre
enings Removed
=
=
5.9ft day
5.3.2 shredding
As an alternative to screening, shredding can be used to reduce
solids to a size that can enter the plant without causing mechanical
problems or clogging. Shredding processes include comminution (
com-
minute
means to “cut up”) and barminution devices.
