Page 354 - Water and wastewater engineering

ION EXCHANGE 8-23

d. Compute the the area in [B17].
3
[B5 ] 275 m /d 2
067 m
.
3
[B8 ] 408 m /dm 2

e. And then the diameter of the column in [B19].
.
⎛ [B17 4 ⎞ ∧ 0 5
]∗
.
⎜ ⎟ 093 m
.
⎝ 3 1416 ⎠
f. Compute the height of the column in cell [B23].
[B13 ] 094 m 3
.
1.40 m
[B17 ] 067 m 2
.
g. Check the H: D ratio.
[B23 ] 140 m
.
.
1 50
.
[B19 ] 093 m
h. Activate the dialog box for Solver and designate the target cell [B27], that is, the one for
the height to diameter ratio ( H: D ).
i. Set Equal to to “Min.”
j. Set By changing to the cell containing the surface loading rate (SLR), that is, [B8].
k. Add the following four constraints in the dialog box:
(1) SLR
[B8 800
]
[B8 400
]
(2) Diameter
[B19 3 6 m
]
.
(3) Height
[B23 40
.
]
[B23 09
.
]
(4) H: D ratio
[B27 3
]
[B27 0 2
]
.
3
2
l. Execute solve to find the SLR 400 m /d · m .
m. With resin column volume, check the EBCT.
3
.
094 m
EBCT 00034 d or 4 92 or 4.99 min
.
.
3
275 m /d