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WHC-SD-W100-TI-003 Rev. 0
Both process lines will use "in-drum" mixing techniques consisting of
both agitated drum and vibrating drum systems. Agitated mixing will be used
for sludges, powders, and particulate wastes. These wastes will be processed
through a pug mill and measured into 208-L (55-gal) drums with installed
agitators before movement to the solidification systems. The drums will then
be coupled to an agitator drive and fill station. The stabilization agents
are then added and mixing begins. When mixing is complete the drum is removed
from the fill station with the agitator remaining in the drum. The drum is
then inspected and capped for movement to the curing storage area. The
vibrating drum system will be used for debris wastes that have been size
reduced by shredders. The operation is similar to the agitated system except
the drum is vibrated to achieve the required mixing, and no agitator is
involved.
The baseline approach for the cement-based system offers the capability
to blend portland cements with various pozzolonic additives, including blast
^ furnace slag, pulverized fly ash, and other dry mixtures, as well as small
y; quantities of specialized additives. The system will allow tailoring the
--_fQrmul-a ona Tot-by-let or-a -drum-by-dr;.1m basis. The agitated grout line will
add the necessary water to the drum, followed by preblended dry materials.
- _; The initial addition of water is to ensure that the waste is easily before the
powders are added. The vibrated grout line will preblend the water and dry
= materials before charging the drum.
Y:S1
The thermosetting polymer system uses several components to achieve
solidification: a vinyl ester-based liquid resin, a promoter, a catalyst, and
an extender. The resin, promoter, and extender are premixed in a day storage
---tank. In the agitated polymer system, this mix is charged to the waste loaded
drum and mixing begins. The catalyst is then added to the mix and the
polymerization reaction begins. Mixing is then stopped and the drum allowed
to cure. As with the cement side, the mixer is left in the drum and the drum
is capped and removed from the station. On the vibrated polymer system, the
promoter, catalyst, and extender are premixed, as on the agitated side. The
catalyst is then mixed in line with this mixture as it is charged to the drum.
The drum is then agitated to achieve proper distribution of the polymer into
the void spaces.
Drum curing storage, inspection, and monitoring, are also required as
part of these systems; however, the details are still under development.
The overall process philosophy for WRAP 2A is that drums of waste will be
------- --&aracter-i-zed-and-group°cd into lots of similar waste before
facility. The WRAP 2A will perform verification testing to
receipt at the
confirm the
--identi-ty-af +_he--incaring-waste lots.-- The-waste-will-then be- ;rze --reduced-in
shredder or homogenized in a pug mill to make the waste suitable for
solidification. The waste will then be premeasured into drums for
solidification. After the drums have cured and been inspected they will be
transferred out of the WRAP 2A Facility for final disposal.
a
Table 1-2 illustrates the proposed conceptual design split as to which
technology will be used for the various feedstreams. This split is reflected
in the approach used in the test work described in this report.
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