UFC 3-280-03
23 JULY 2003
Remedial measures to minimize lime scaling are using an acid wash system
to periodically remove the scale buildup or changing the conditioning chemicals from
lime to polymers. Although polymers may work well in some applications, testing should
be done to ensure that dewatering is adequate.
2-9.1.2.9 Light Curtain Reliability. The light curtain is designed to protect operators
from injury when the closing or plate shifting mechanism is operating. However,
equipment corrosion, electrical failure, or faulty alignment of the transmitter and receiver
could stop the light curtain from functioning. Because this is a safety device, it must be
kept in proper working order and should be checked routinely as part of the operation
and maintenance procedures.
2-9.1.3 Process Integration. Filter presses experience few process integration
problems compared with other treatments or processes. Filter presses can handle
nearly all types and mixtures of sludge and operating criteria can be modified because
of their batch operation. One problem, however, is non-uniform sludge feed. Although
the filter press system can accommodate a variety of sludges, to be most efficient, the
sludge feed should be blended and conditioned to maintain the sludge's continuity
throughout the filtration cycle.
2-9.1.4 Auxiliary Systems. The problems with auxiliary systems include corrosion of
pneumatic cylinders and excessive misting from filter media washing systems.
2-9.1.4.1 Pneumatic Cylinder Corrosion. Pneumatic cylinder corrosion and ultimate
failure can be caused by high moisture levels in compressed air supplied to the filter
press. This problem can be resolved by adding drying equipment to the compressed air
system.
2-9.1.4.2 Excessive Misting. Excessive misting during filter media washing can result
in corrosion and failure of mechanical devices, instrumentation, and electrical devices.
Remedial measures to reduce or eliminate this problem include using brush assemblies
or spray curtains to contain the mist.
2-9.2
Storage Requirements. Paragraph 2-4.2 provides considerations for liquid
sludge storage, Paragraph 2-4.8 provides considerations for sludge cake storage, and
Subparagraph 2-7.3.2.2 provides storage sizing requirements for both liquid sludge and
sludge cake.
2-9.3
Utility Requirements. Although utility requirements will be specific to the
individual facility, a summary of typical requirements for filter presses and supporting
equipment is discussed in the following subparagraphs.
2-9.3.1 Power. Although power requirements are specific to both the system and
equipment used, the typical filter press requires 480 volts, three-phase, 60 Hz power at.
This power is typically supplied to a single power distribution system that sends the
power to individual motors and equipment requiring the 480 volt/three-phase/60 Hz
2-81
Previous Page
