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 the ledge of the storage area into the trailer. This method
is generally employed where solid waste quantities delivered
exceed 500 yd3 per day.
! Dump to Tipping Floor. This method is similar to the storage
pit method, except solid wastes are dumped onto a tipping
floor rather than a storage pit, crushed by crawler tractors,
and pushed into the trailer (see Figure 4-2-5B). This method
is used effectively when solid waste delivery rates range from
100 to 500 yd3 per day.
4.2.5.5 Once the solid waste is in the trailer, it is generally
leveled and further compacted by a backhoe or similar tamping device.
4.2.5.6 At the disposal site, various methods are used to unload the
trailers, with the most efficient being the live bottom trailer. The floor of
these trailers consists basically of a conveyor or other active type
floorsystem which, when activated, automatically unloads the trailer.
4.2.5.7 Dump into Hydraulic Compaction Units. These systems are
generally employed only at locations where solid waste delivery rates exceed
500 yd3 per day. In a hydraulic compaction system, a transfer trailer is
backed into position and locked to a stationary compactor firmly anchored in a
concrete foundation. The compactors used are large, heavy-duty units capable
of handling most materials and producing the waste densities necessary to
obtain maximum legal payloads. During operation, solid waste is loaded to the
compactor from a hopper and the hydraulically powered reciprocating ram of the
compactor forces the refuse horizontally through the door in the rear of the
transfer trailer. At the disposal site, the entire rear section of the
transfer trailer is opened and the waste pushed out by an ejection ram.
Because this system requires that the transfer trailer be attached to the
compactor, any hydraulic compaction system prohibits the use of drive-through
arrangements.
4.2.5.8 There are several methods of feeding waste to the compactor
hopper:
! direct dump into the hopper
! dump into a hydraulic push-pit equipped with a hydraulically
activated ram which automatically feeds waste into the hopper
! dump into a storage pit or tipping floor where waste is crushed and
pushed into the hopper by a wheel loader or crawler tractor
! dump into an inclined conveyor which automatically feeds waste
into the hopper.
4.2.5.9 Table 4-2-SA presents a summary of transfer station systems
available for use at military installations, including advantages and
disadvantages of each system.
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