Sulfur polymer cement encapsulation of oily matrix mixed low-level sludge
Technical Report
·
OSTI ID:437513
- Oak Ridge Y-12 Plant, TN (United States)
The U.S. Department of Energy (DOE) has been investigating a variety of stabilization technologies for the treatment of mixed low-level debris and sludges. Sulfur Polymer Cement (SPC) is being considered as one possible alternative final waste form for that segment of these wastes that does not readily lend itself to vitrification and/or grout stabilization. Earlier work demonstrated that SPC effectively immobilizes some Resource Conservation and Recovery Act (RCRA) toxic metal and metal salt species. However, the use of SPC as an encapsulant is relatively new, and the scope of tested waste streams has been limited. Accordingly, the authors` intent was to identify and ascertain the effects of process variables on final waste form properties for encapsulated mixed low-level sludge. The authors conducted an optimal design factorial experiment to study the effects of eight variables in twelve trials with replication. Factors for consideration included waste spike level, waste loading, additive type, additive loading, mixing method, hold time, hold temperature, and cooling rate. Toxic metal leachability was assessed for samples and was the basis for factor comparison. Trials were typically conducted with 150-g of total material per batch. Experimental results demonstrated that a number of process variables -- process hold time, cooling rate, waste loading, spike level, process temperature, additive type, and additive loading -- can influence toxic metal leachability. Also, the effects of different factors may weigh more heavily on different individual species; accordingly, optimum process conditions may vary considerably based on waste composition.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Williams (Paul) and Associates, Medina, OH (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 437513
- Report Number(s):
- EPRI-TR--106929; CONF-960783--
- Country of Publication:
- United States
- Language:
- English
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