UFC 3-280-03
23 JULY 2003
Chemical
Addition-
Feed
Feed/
Cake Solids
Percent of
Solids
Squeeze
(%)
Dry Solids2
Cycle Time
(%)
Pressure
1
(Minutes)3
(kPa)4
Application
Pharmaceutical
1 to 4
FeCl3-10 &
120210
690/1550
30 to 40
Biological Sludge
Lime-30
Textile Waste
2 to 8
FeCl3-10 &
120210
690/1550
30 to 40
Lime-30
Titanium Dioxide
4 to 10
None
90150
690/1550
35 to 50
Process Sludge
Water Based Ink
1 to 10
FeCl3-5 &
90150
690/1550
40 to 60
Sludge
Lime-15
Water Based Paint
4 to 10
FeCl3-4 &
90150
690/1550
45 to 70
Sludge
Lime-12
Wet Scrubber
5 to 15
None
4590
690/1550
50 to 80
1
Application data complied from manufacturers referenced in Appendix A.
2
Polymer dosages are not listed because several types may be commercially available and applicable for
the sludge application listed.
3
Cycle time includes mechanical turnaround (i.e., plate shifting, etc.).
4
Pressure conversations: 690 kPa is equivalent to 100 psi, and 1550 kPa is equivalent to 225 psi.
2-4.
plate and frame filter press require that several key factors be considered to achieve the
desired solids content. Recommendations for the equipment, operations, and auxiliary
systems are discussed in detail in the paragraphs that follow.
2-4.1
General. Several process variables affect the efficiency of both fixed-volume
and variable-volume recessed plate and frame filter press systems. In addition to the
press itself, auxiliary systems may also affect the filter press performance. Specific
design operating conditions for each application are based on the dewatering conditions
required, such as maximum operating or terminal pressures, and associated dewatering
equipment selected. A schematic of a comprehensive filter press system and its
associated support systems is shown in Figure 2-5. Discussions of the applicability and
use of these systems are presented in the paragraphs that follow. A general guide of
typical design conditions for filter press applications is also presented in Table 2-6.
2-4.2
Sludge Storage. Sludge storage, as defined in this paragraph, is storage
prior to dewatering. Sludge storage is an integral part of the solids treatment and
dewatering process that can provide the following benefits:
Equalizes sludge flow to downstream dewatering devices.
Provides a more uniform feed rate and uniform sludge characteristics, which
enhance pretreatment processes such as thickening and conditioning.
2-23
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