Environmental Engineering Reference
In-Depth Information
FIGURE 5.3
Bitumen wiped film evaporator system installed within a hot cell at the Korean
Atomic Energy Research Institute.
EXHAUST
BITUMEN
STORAGE
TANK
EXHAUST
ASH
FEEDER
BITUMEN
METERING
PUMP
HOT
OIL
UNIT
FLOW
CALIBRATION
CONNECTION
TWIN-SCREW EXTRUDER
PRODUCT
FIGURE 5.4
Process flow diagram for bitumen encapsulation twin-screw extrusion process.
Power Station in Michigan to treat aqueous borated salts in the early 1980s, but was
abandoned due to poor process efficiency. Advantages of the bituminization process
include:
•
Relatively low cost of binder material.
•
Relatively low process temperatures compared with vitrification pro-
cesses. Bitumen is processed at 150 to 230°C, whereas vitrification
requires temperatures in excess of 800°C.
•
Relatively low leachability due to the impermeable nature of the binder.
The Leachability Index for
137
Cs contained in soluble salts incorporated
in bitumen, determined using the ANSI/ANS-16.1-2003 leach test, was
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