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In-Situ Chemical Oxidation: Permanganate Oxidant Volume Design Considerations
Citation:
Huling, Scott G., Randall R. Ross, AND K. Prestbo. In-Situ Chemical Oxidation: Permanganate Oxidant Volume Design Considerations. Groundwater Monitoring & Remediation. Wiley-Blackwell Publishing, Hoboken, NJ, 37(2):78-86, (2017). https://doi.org/10.1111/gwmr.12195
Impact/Purpose:
Contaminant rebound and low contaminant removal are reported more frequently with in-situ chemical oxidation (ISCO) than other in-situ technologies. Although there are multiple causes for these results, a critical analysis indicates that low oxidant volume delivery is a key issue. Design guidelines and recommendations are provided that could help achieve more effective technology deployment, reduce the role of heterogeneities in the subsurface, and result in greater probability the oxidant is delivered to the targeted treatment zone.
Description:
Contaminant rebound and low contaminant removal are reported more frequently with in-situ chemical oxidation (ISCO) than other in-situ technologies. Although there are multiple causes for these results, a critical analysis indicates that low oxidant volume delivery is a key issue. The volume of oxidant injected is critical and porosity of the aquifer matrix can be used to estimate the pore volume. The total porosity (θT) is the volume of voids relative to the total volume of aquifer material. The mobile porosity (θM) is the fraction of voids that readily contributes to fluid displacement, and is less than θT leading to smaller estimates of oxidant volume. Injecting low oxidant volume may result in inadequate oxidant distribution and post-injection dispersal within the radius of influence (ROI), insufficient oxidant contact and oxidant loading, and incomplete treatment. Whereas, greater oxidant volume achieves a greater oxidant footprint and may involve risk that the injected oxidant may migrate into non-target areas and displacement of contaminated ground water. Design guidelines and recommendations are provided that could help achieve more effective technology deployment, reduce the role of heterogeneities in the subsurface, and result in greater probability the oxidant is delivered to the targeted treatment zone.
URLs/Downloads:
DOI: In-Situ Chemical Oxidation: Permanganate Oxidant Volume Design Considerations
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