Reactive Transport Modeling of Closure-In-Place with Intersecting Groundwater and Remedial Actions Part I.pdf

Jason James, Exponent
Olivia Paradis, Exponent
Rachel Kelly, Exponent
Walter McNab, Exponent

Description

Reactive Transport Modeling of Closure-in-Place with Intersecting Groundwater and Remedial Actions: Part I, Model Creation and Execution Authors Dr. Jason James - United States - Exponent Dr. Olivia Paradis - United States - Exponent Dr. Rachel Kelly - United States - Exponent Dr. Walter McNab - United States - Exponent Mr. Bruce Hensel - United States - Electric Power Research Institute Abstract This EPRI research project was initiated to better understand two objectives: • How is mobility of inorganic constituents affected by the intersection of groundwater with coal combustion product ponds and landfills under varying geologic and redox conditions? • How do corrective actions after closure-in-place affect constituent mobility? To address these objectives, a 2-dimensional model was used to simulate groundwater flow and reactive solute transport through a CCP deposit with intersecting groundwater both during active management and after closure-in-place. Baseline scenarios were developed to represent fast and slow groundwater flow and transport conditions. Physical and chemical parameters considered when developing the baseline scenarios were (1) hydrogeologic environment, (2) whether the unit was a landfill or impoundment, (3) the coal source, and (4) prominent oxidation-reduction and precipitation-dissolution reactions present in the hydrogeologic environment. The end member scenarios simulated were no action and closure by removal (CBR). The remediation scenarios considered were (1) capping, (2) capping + zero valent iron (ZVI), (3) capping + groundwater extraction, and (4) in-situ solidification (IS). In this presentation we will discuss how data were synthesized and how the modeling was performed. Results will be presented in a separate Part II presentation.

 
May 15th, 9:00 AM May 15th, 9:30 AM

Reactive Transport Modeling of Closure-In-Place with Intersecting Groundwater and Remedial Actions Part I.pdf

Grand Rapids, Michigan

Reactive Transport Modeling of Closure-in-Place with Intersecting Groundwater and Remedial Actions: Part I, Model Creation and Execution Authors Dr. Jason James - United States - Exponent Dr. Olivia Paradis - United States - Exponent Dr. Rachel Kelly - United States - Exponent Dr. Walter McNab - United States - Exponent Mr. Bruce Hensel - United States - Electric Power Research Institute Abstract This EPRI research project was initiated to better understand two objectives: • How is mobility of inorganic constituents affected by the intersection of groundwater with coal combustion product ponds and landfills under varying geologic and redox conditions? • How do corrective actions after closure-in-place affect constituent mobility? To address these objectives, a 2-dimensional model was used to simulate groundwater flow and reactive solute transport through a CCP deposit with intersecting groundwater both during active management and after closure-in-place. Baseline scenarios were developed to represent fast and slow groundwater flow and transport conditions. Physical and chemical parameters considered when developing the baseline scenarios were (1) hydrogeologic environment, (2) whether the unit was a landfill or impoundment, (3) the coal source, and (4) prominent oxidation-reduction and precipitation-dissolution reactions present in the hydrogeologic environment. The end member scenarios simulated were no action and closure by removal (CBR). The remediation scenarios considered were (1) capping, (2) capping + zero valent iron (ZVI), (3) capping + groundwater extraction, and (4) in-situ solidification (IS). In this presentation we will discuss how data were synthesized and how the modeling was performed. Results will be presented in a separate Part II presentation.