TY - GEN
T1 - Monitoring the remediation of organic contaminants by colloidal activated carbon
T2 - 2nd Conference on Hydrogeophysics 2023, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
AU - Almpanis, A.
AU - Slater, L.
AU - Power, C.
N1 - Publisher Copyright: © 2023 2nd Conference on Hydrogeophysics 2023, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023. All Rights Reserved.
PY - 2023
Y1 - 2023
N2 - Colloidal activated carbon (CAC) filters are becoming a popular option to remediate groundwater contaminated by DNAPLs and a real-time monitoring approach is desirable to assess its effectiveness. In this study, the spectral induced polarization (SIP) technique is evaluated for its applicability as a monitoring tool for DNAPL adsorption within CAC-filters. The adsorption of low-concentration (50 mg/L) tetrachloroethylene (PCE) in a CAC-filter was examined using a set of dynamic column experiments combined with SIP monitoring. The initial flushing of CAC into inert porous media was tracked by SIP monitoring, with an increase in both real and imaginary components of the complex conductivity. The CAC was then flushed out of the column via groundwater, leaving behind only carbon particles that will later adsorb the PCE. The process of flushing the CAC by groundwater indicated a decrease in both the SIP real and imaginary conductivities, with the imaginary holding a small amount of polarizability, which is likely associated with the remaining carbon particles. Finally, dissolved phase PCE was injected through the column, with insignificant changes in the simultaneous SIP response. This study suggests that SIP can monitor CAC within porous media but is insensitive to the low concentrations of dissolved phase PCE.
AB - Colloidal activated carbon (CAC) filters are becoming a popular option to remediate groundwater contaminated by DNAPLs and a real-time monitoring approach is desirable to assess its effectiveness. In this study, the spectral induced polarization (SIP) technique is evaluated for its applicability as a monitoring tool for DNAPL adsorption within CAC-filters. The adsorption of low-concentration (50 mg/L) tetrachloroethylene (PCE) in a CAC-filter was examined using a set of dynamic column experiments combined with SIP monitoring. The initial flushing of CAC into inert porous media was tracked by SIP monitoring, with an increase in both real and imaginary components of the complex conductivity. The CAC was then flushed out of the column via groundwater, leaving behind only carbon particles that will later adsorb the PCE. The process of flushing the CAC by groundwater indicated a decrease in both the SIP real and imaginary conductivities, with the imaginary holding a small amount of polarizability, which is likely associated with the remaining carbon particles. Finally, dissolved phase PCE was injected through the column, with insignificant changes in the simultaneous SIP response. This study suggests that SIP can monitor CAC within porous media but is insensitive to the low concentrations of dissolved phase PCE.
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U2 - 10.3997/2214-4609.202320201
DO - 10.3997/2214-4609.202320201
M3 - Conference contribution
T3 - 2nd Conference on Hydrogeophysics 2023, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
BT - 2nd Conference on Hydrogeophysics 2023, Held at Near Surface Geoscience Conference and Exhibition 2023, NSG 2023
PB - European Association of Geoscientists and Engineers, EAGE
Y2 - 3 September 2023 through 7 September 2023
ER -