UFC 3-280-03
23 JULY 2003
Filter volume per cycle = [1230 kg/d] / [(4 cycle/d) x (1280 kg/m3) x (0.30)] = 0.8 m3 (29 ft3) of
sludge/cycle
5-2.3.2
Selection of Efficient Filter Unit.
5-2.3.2.1 Determine the Pressure Filter Sizes Available. From the manufacturers'
catalogs, determine the sizes of various filter units. Tabulate the filter area available with
and without the single largest unit. See Table 5-1.
5-2.3.2.2 Select Proper Filter Press Unit. The most efficient and manageable filter
press unit assembly is the one that has the fewest operating units and provides nearly
100% operating capacity when one unit is out of service, and about 25% extra capacity
when all units are in operation. Based on this method, the proper unit selection from
Table 5-1 would be Unit F. This selection has a total of four units, including three
operating units and one standby unit. This assembly will provide 105% of the design
daily requirement when one unit is not operating, and 140% of the design daily
dewatering capacity when the standby unit is in operation. Although Unit D required the
same number of units and has the same overall operating capacities, this selection is
the maximum capacity of this size unit and would not allow for additional future capacity,
if necessary. A typical schematic layout of the filter press units and supporting
equipment is presented in Figure 5-1.
Table 5-1. Selection chart of recessed fixed-volume plate and frame
filter press units.
Total
Total
Volume
Total
Volume
Volume
Volume
Volume
Filter
without
Units
with
Minimum
with
No. of
of Each
Unit
with
Size
standby
with
standby
Units
One
Chambers
Unit
I.D.
Minimum
1
(mm)
Unit
one
Unit
Required
Standby
3
(m )
Units
2
3
(%)
Standby
(%)
Unit
3
(m )
3
(m )
A
470
27
0.11
8
0.88
9
0.99
110
124
B
470(max)
40
0.20
5
1.0
6
1.2
125
150
C
630
27
0.23
4
0.92
5
1.15
115
144
D
630(max)
30
0.28
3
0.84
4
1.12
105
140
E
800
16
0.23
4
0.92
5
1.15
115
144
F
800
20
0.28
3
0.84
4
1.12
105
140
G
800(max)
40
0.57
2
1.14
3
1.71
143
214
3
3
Conversions: 1 m = 35.3 ft , 1 inch= 25 mm.
1
Data compiled from actual manufacturer's data.
2
Total volume without standby unit/actual volume required.
3
Total volume with one standby unit/actual volume required.
5-4
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