Alternative cement kiln dust (CKD) management options under new CKD management standards
Conference
·
OSTI ID:347800
- RMT, Inc., Madison, WI (United States)
- RMT, Inc., Okemos, MI (United States)
The USEPA is developing proposed regulations (due out in 1998) for the management of cement kiln dust (CKD), which has been a Bevill Exempt waste since 1980. The regulations will mandate that CKD be disposed in monofills that meet minimum locational and performance and/or design standards, or the facility will risk being subject to tailored Subtitle C regulations. One of the more significant management issues addressed in the upcoming proposed rules is fugitive dust control. The preferred management option for this is to condition CKD with water to achieve optimal moisture contents for maximum field compaction. This paper describes some of these integrated CKD management systems, including the moisture-conditioning process and current or potential compaction methods, and presents bench- and field-scale results to demonstrate their effectiveness. The results are encouraging, and the benefits of such systems extend well beyond controlling fugitive dust. The density of the waste mass can potentially be increased by as much as 25%, resulting in longer site life. Additionally, because of its cementitious properties, newly generated CKD has the potential to set up as a monolithic block if moisture-conditioned properly. Significant decreases in hydraulic conductivity can also result (potentially 2 to 3 orders of magnitude). These factors will result in a decrease in both the leachate generation potential and the strength of the leachate due to the significant reduction in surface area available for leaching. Consequently, there is a greater likelihood that the landfill will be able to meet the groundwater performance standards, and as such may mitigate the need to meet the design containment standards (clay or geomembrane liner and cover/leachate collection system) or eliminate them entirely, depending on the site location. Thus, the potential cost savings for such management systems are significant.
- OSTI ID:
- 347800
- Report Number(s):
- CONF-9804112--
- Country of Publication:
- United States
- Language:
- English
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