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accordance with a Cooperative agreement signed with the Wisconsin DNR
(50). Any material that is found to be unsuitable for beneficial application
such as miscellaneous debris or soil is separated and properly placed in
designated areas within the current active cell.
The first pilot project to reprocess landfilled combustion products were carried
out in July 1998 and the second in October 1998. An earthwork contractor
who was very experienced in landfill and ash management performed the
work. A state certified material testing laboratory was also hired to monitor
and sample the processed material, during the first operation. The contractor’s
engineer collected samples during the second operation. Samples were
collected every 30 minutes from the transfer point where the ash fell onto the
stacker conveyor during the entire operation per ASTM sampling procedure
D2234. A composite sample was prepared for every 5000 tons processed and
tested.
Both ash recovery operations worked very smoothly, and were dust free due
to the residual moisture and low fines content of the material processed.
Figure 6-11 shows the grain size distribution range of the recovered ash. It is
important to mention that the samples tested had excellent grain size
distribution and a small amount of material passing the #200 sieve. Tests run
----------------------------U.S. STANDARD----------------------
100
3/4"
1/2"
3/8"
#4
#8
#16
#30
#40
#50
#100
#200
HYDROMETER
Percent Passing
80
60
40
20
0
100.000 10.000 1.000 0.100
Particle Diameter (mm)
GRAVEL
SAND
SILT OR
CO MED FINE CO MEDIUM FINE CLAY
0.010
Figure 6–11: Gradation Distribution Range of Recovered Ash
to evaluate the environmental effects of this material also gave encouraging
results. The ash met all of the NR538 category 2 criteria with the exception of
dissolved aluminum. However the concentration of aluminum was only
slightly above the limits (18 to 22 mg/l vs. 15 mg/l criteria).
We Energies 176
Coal Combustion Products
Utilization Handbook