UFC 3-280-03
23 JULY 2003
Parameter1,2
Applicability
Typical Design
Conditions2
Typically sized to are 1.5
-Filter Media Acid Wash
Used as required to reduce lime scaling
times the capacity of the
(Subparagraph 2-4.6.3.2)
on filter media for lime conditioning
press.
applications.
-Compressed Air
(Subparagraph 2-4.6.4)
Instrument Air
Used as required for pneumatic control.
Typically requires 690 kPa
pressure.
Air Blow/Core Blow
Used as desired to reduce excessive
filter media washing and provide drier
sludge cake.
690-1380 kPa.
Membrane Air
Typically used with variable-volume
Inflation
presses for no more than 150 psi
pressure applications.
Filter Press Control
Application specific.
Applicable type (i.e., manual,
Systems (Paragraph 2-10)
semiautomatic, and automatic systems)
based on the degree of desired
automation. Typically degree of
automation dependent on size of unit
and use of accessories and auxiliary
systems.
Sludge Cake Handling and
Typically involves only direct discharge
4 days' minimum storage
Storage
into storage container.
required if no other
dewatering facilities exist.
(Paragraph 2-4.10)
Sludge Cake Transport
Application specific.
Typically involves use of either
(Paragraph 2-4.11)
conveyor, auger, or sludge cake
pumping system when further sludge
treatment is required.
Sludge Cake Disposal
Application specific.
Several ultimate disposal methods are
(Paragraph 2-4.12)
available and are dependent on the
specific sludge generated.
1
More details are provided on design considerations and specific applications in the paragraphs
referenced.
2
Conversion Factors:
1 kPa = 0.15 psi
1 kg/m2 = 0.2 lb/ft2
1 L/m2s = 1.45 gpm/ft2
2-4.3.1.1 The feed system should be designed to achieve the initial fill cycle at initial
pressure (typically 70 to 140 kPa [10 to 20 psig]) within the first 5 to 15 minutes to
ensure even sludge cake formation. Any imbalance in the sludge feed rate or cake
formation can result in a nonuniform cake of high resistance, cloth binding, or initial poor
filtration quality, and longer cycle times (EPA 1979). After this initial fill period and as the
2-28
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