Location
Grand Rapids, Michigan
Start Date
15-5-2024 8:00 AM
End Date
15-5-2024 8:30 AM
Description
Dewatering Basics – Understanding the challenges of dewatering Authors Mrs. Christine Harris - United States - None Abstract The current EPA Coal Combustion Residuals Rule requires the removal of Free Liquids from coal ash. Free liquids are defined as all ‘‘liquids that readily separate from the solid portion of a waste under ambient temperature and pressure,’ regardless of whether the source of the liquids is from sluiced water or groundwater. 40 CFR 257.53. Consequently, the directive applies to both the freestanding liquid in the impoundment and to all separable porewater in the impoundment, whether the porewater was derived from sluiced water, stormwater run-off, or groundwater that migrates into the impoundment. " There are several options for dewatering coal ash impoundments. This presentation will start with an understanding of the basics of coal as well as exploring how utilizing an engineered approach to dewatering can result in more efficient civil construction. The steps to designing an engineered dewatering system will be examined. Attendees will leave with an understanding of what information is needed about the ash impoundment and surrounding geology to begin the design of the dewatering system. Additionally, they will understand what a pilot test is and why it is important in the overall design of the system.
Document Type
Event
Dewatering Basics – Understanding the Challenges of Dewatering
Grand Rapids, Michigan
Dewatering Basics – Understanding the challenges of dewatering Authors Mrs. Christine Harris - United States - None Abstract The current EPA Coal Combustion Residuals Rule requires the removal of Free Liquids from coal ash. Free liquids are defined as all ‘‘liquids that readily separate from the solid portion of a waste under ambient temperature and pressure,’ regardless of whether the source of the liquids is from sluiced water or groundwater. 40 CFR 257.53. Consequently, the directive applies to both the freestanding liquid in the impoundment and to all separable porewater in the impoundment, whether the porewater was derived from sluiced water, stormwater run-off, or groundwater that migrates into the impoundment. " There are several options for dewatering coal ash impoundments. This presentation will start with an understanding of the basics of coal as well as exploring how utilizing an engineered approach to dewatering can result in more efficient civil construction. The steps to designing an engineered dewatering system will be examined. Attendees will leave with an understanding of what information is needed about the ash impoundment and surrounding geology to begin the design of the dewatering system. Additionally, they will understand what a pilot test is and why it is important in the overall design of the system.
