Location
Grand Rapids, Michigan
Start Date
15-5-2024 11:00 AM
End Date
15-5-2024 11:30 AM
Description
Laboratory treatability studies can be used to evaluate and optimize groundwater treatment options for contaminants of concern (COCs) found at coal combustion residual (CCR) sites. An important consideration in groundwater treatment selection is the suitability of monitored natural attenuation (MNA) as a treatment component or as a stand-alone passive treatment. This presentation will focus on the use of treatability testing to evaluate natural and enhanced attenuation treatment options for redox sensitive metals in CCR-impacted groundwater. In one demonstration, a comprehensive laboratory program was performed based upon the USEPA’s tiered approach to identify the natural attenuation processes, rates, attenuation capacities, and longevity of arsenic (As), lithium (Li), sulfate (SO42-), and boron (B) impacted groundwater from a CCR impoundment site. Laboratory testing was used to develop site-specific sorption coefficients and demonstrate that after sorption, potential desorption back into groundwater would not be affected by changing redox conditions. The data was also used to provide insight into the attenuation mechanisms. These findings helped to support MNA as part of the corrective action plan submitted to the regulator. In a second demonstration, zero valent iron (ZVI) was used to sorb As from groundwater. The results from the treatability study were used to support the feasibility assessment for the Site.
Document Type
Event
Paper_Attenuation of Metals and Inorganics: Insights from Laboratory Testing Approaches
Grand Rapids, Michigan
Laboratory treatability studies can be used to evaluate and optimize groundwater treatment options for contaminants of concern (COCs) found at coal combustion residual (CCR) sites. An important consideration in groundwater treatment selection is the suitability of monitored natural attenuation (MNA) as a treatment component or as a stand-alone passive treatment. This presentation will focus on the use of treatability testing to evaluate natural and enhanced attenuation treatment options for redox sensitive metals in CCR-impacted groundwater. In one demonstration, a comprehensive laboratory program was performed based upon the USEPA’s tiered approach to identify the natural attenuation processes, rates, attenuation capacities, and longevity of arsenic (As), lithium (Li), sulfate (SO42-), and boron (B) impacted groundwater from a CCR impoundment site. Laboratory testing was used to develop site-specific sorption coefficients and demonstrate that after sorption, potential desorption back into groundwater would not be affected by changing redox conditions. The data was also used to provide insight into the attenuation mechanisms. These findings helped to support MNA as part of the corrective action plan submitted to the regulator. In a second demonstration, zero valent iron (ZVI) was used to sorb As from groundwater. The results from the treatability study were used to support the feasibility assessment for the Site.
