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Analytical and Numerical Methods for a Preliminary Assessment of the Remediation Time of Pump and Treat Systems
Article

Remediating Contaminated Groundwater with an Aerated, Direct-Push, Oxidant Delivery System

1
AirLift Environmental, LLC, 5900 N. 58th, Suite 5, Lincoln, NE 68507, USA
2
Department of Civil Engineering, University of Nebraska, Lincoln, NE 68588-6105, USA
3
Department of Environmental Technology and Management, Kasetsart University, Bangkok 10900, Thailand
4
Department of Chemistry, Albion College, Albion, MI 49224, USA
5
School of Natural Resources, University of Nebraska, Lincoln, NE 68583-0915, USA
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3383; https://doi.org/10.3390/w12123383
Received: 25 September 2020 / Revised: 4 November 2020 / Accepted: 25 November 2020 / Published: 2 December 2020
(This article belongs to the Special Issue Groundwater and Soil Remediation)
One of the biggest challenges to treating contaminated aquifers with chemical oxidants is achieving uniform coverage of the target zone. In an effort to maximize coverage, we report the design and installation of a novel aerated, slow-release oxidant delivery system that can be installed by direct-push equipment. By continuously bubbling air beneath a slow-release oxidant in situ, an airlift pump is created that causes water and oxidant to be dispersed from the top of the outer screen and drawn in at the bottom. This continuous circulation pattern around each drive point greatly facilitates the spreading of the oxidant as it slowly dissolves from the wax matrix (i.e., oxidant candle). Given that the aeration rate controls the outward flow of oxidant from the outer screen in all directions, the radius of influence around each drive point is largely a function of the outward velocity of the oxidant exiting the screen and the advection rate opposing the upgradient and lateral spreading. Temporal sampling from three field sites treated with the aerated oxidant system are presented and results show that contaminant concentrations typically decreased 50–99% within 6–9 months after installation. Supporting flow tank experiments that demonstrate oxidant flow patterns and treatment efficacy are also presented. View Full-Text
Keywords: airlift pump; groundwater remediation; modular oxidant delivery system; oxidant cylinders; oxidant delivery device airlift pump; groundwater remediation; modular oxidant delivery system; oxidant cylinders; oxidant delivery device
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MDPI and ACS Style

Reece, J.; Christenson, M.; Kambhu, A.; Li, Y.; Harris, C.E.; Comfort, S. Remediating Contaminated Groundwater with an Aerated, Direct-Push, Oxidant Delivery System. Water 2020, 12, 3383. https://doi.org/10.3390/w12123383

AMA Style

Reece J, Christenson M, Kambhu A, Li Y, Harris CE, Comfort S. Remediating Contaminated Groundwater with an Aerated, Direct-Push, Oxidant Delivery System. Water. 2020; 12(12):3383. https://doi.org/10.3390/w12123383

Chicago/Turabian Style

Reece, James, Mark Christenson, Ann Kambhu, Yusong Li, Clifford E. Harris, and Steve Comfort. 2020. "Remediating Contaminated Groundwater with an Aerated, Direct-Push, Oxidant Delivery System" Water 12, no. 12: 3383. https://doi.org/10.3390/w12123383

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