1321 - Office of Legacy Management - U.S. Department of Energy

FDF Subcontract No. 98SC000001
IT Project No. 77348 1
23.6 Waste Processing
Desaiption of Operation de procesS
IssueDate: 2/13/98 Rev. B
The majority of the waste material is expected to require drying. However, a greater or lesser
amount may be dried, depending upon actual waste condition in the pits upon excavation. Since
these waste materials will ultimately be landfilled, proper moisture is critical to achieving
adequate compaction when placed in the landfill. Uniformity and dryness are also necessary in
handling to prevent bulking, cementing, or hold up in railroad cars during unloading.
23.7 Final Blending
Matkrial loaded out in railcars must meet the WAC for the disposal facility. Wastes will be
blended to meet moisture and radiological criteria and to maximize efficient loading of railcars.
As noted earlier, most of the waste will be processed through the thermal dryer since it contains a
significant overall excess of water. Some of the wastes including the pit soil caps and certain
materials stockpiled in the OU1 Contaminated Soil Stockpile area are expected to be near
optimum moisture as excavated. These materials may be loaded as is or reserved for blending.
The material exiting the dryer may be further mixed with material that has bypassed the drying
step. Further blending before or after the dryer can be utilized to improve/ensure the blend
quality of the final product.
The average bulk density of waste material loaded out into the railcars is expected to be 1.23 tons
per cubic yard.
2.4 Dryer Feed System (PFD D-10-10-001)
PFD D- 10- 10-00 1 depicts operations for waste materials fed from the waste preparation area into
the dryer. The PFD depicts a stream for feeding sludge material to the dryer. A fiont end loader
will be used to transfer solid waste materials from the staging bins to the feed hopper and mass
flow screw feeder (H-1001). The feed screw has a variable speed control. Material is transferred
from the mass flow screw feeder to the belt feed conveyor (H-1002) which includes a belt scale
(2-1001). The speed of the mass flow feeder is automatically controlled to adjust the mass rate
of waste material being fed as measured and indicated by the belt scale. The feed material
discharges from the belt feed conveyor into the dryer feed screw (H-1003) that extends into the
dryer. The screw feeder provides a positive feed mechanism to m e uniform transfer of the
material into the dryer, and it also provides a positive seal that limits the amount of infiltration
air into the dryer.
W957/WPRAP/EUE2.W2-20-98(909 myDI/NE 7
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