UFC 3-280-03
23 JULY 2003
CHAPTER 5
DESIGN EXAMPLES
5-1
DESIGN APPROACH FOR PLATE AND FRAME FILTER PRESS
APPLICATIONS. Following is a typical approach for designing a plate and frame filter
press and supporting systems for sludge dewatering, as well as basic information that is
required.
5-1.1
Develop sludge characteristics and perform a mass balance based on the
design flow rate around each treatment process generating sludge. From this analysis
the following information should be obtained:
Design flow rate of sludge generated per day.
Sludge solids concentration.
Whether the sludge requires pretreatment or is stabilized.
5-1.2
Determine the method of ultimate sludge cake disposal and associated
requirements. From this, the following information should be obtained:
Maximum allowable moisture content of the sludge cake.
Design criteria from the concerned regulatory agencies, including any
contaminant-specific disposal criteria.
5-1.3
Evaluate existing or proposed treatment site conditions, such as space, and
determine how this will interface with existing or proposed treatment units.
5-1.4
Determine the need or type of conditioning required for proper dewatering.
For plate and frame filter presses, this typically includes bench scale or pilot scale
testing to establish the type and dosages of chemical conditioning required, mixing
requirements, and reaction period.
5-1.5
Develop design data for selecting dewatering equipment. From this process,
the following information should be obtained:
Operational period.
Filter press solids-loading rate.
Cycle time.
5-1.6
Obtain manufacturers' catalogs and equipment selection guides.
5-1.7
Evaluate operational characteristics of the equipment, including energy
requirements, specialized maintenance requirements, performance reliability, and sim-
plicity of operation.
5-1
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