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TIME DOMAIN INDUCED POLARIZATION MONITORING FOR ENHANCED REMEDIATION OF DNAPLS DURING IN-SITU MICROEMULSION FLUSHING
Zhao, R., X. Guan, A. Gu, J. Meng, X. Huang, S. Liu, and D. Mao.
Environmental Earth Sciences 85:165(2026)
Filed Under: Demonstrations
Filed Under: Demonstrations
Alternating time domain induced polarization (TDIP) measurements and injection/pumping operations were conducted at a CHCl3-contaminated weathered andesite site. Full-decay TDIP data were inverted and correlated with groundwater sampling to reflect contaminant solubilization and reagent distribution. Interpretation results demonstrated that TDIP provided spatially continuous electrical imaging in the entire remediation volume, capturing the footprints of CHCl3-contaminated groundwater and the remediation reagent. The injected reagent exhibited strong conductivity and polarization contrasts with contaminated groundwater, confirming its spread across most of the weathered andesite layer. Thresholds of m=50 mV/V delineated CHCl3 contamination zones exceeding the regulatory limit of 300 µg/L. Reagent spreading along profiles revealed preferential flow paths within highly permeable fracture zones. Chargeability reduction correlated with DNAPL desorption showed >90% removal efficiency in groundwater samples, although residual contamination persisted in heavily contaminated zones. Microemulsion flushing effectively enhanced DNAPL solubilization, while weathered andesite medium and excessively high injection velocity limited remediation effectiveness. This article is Open Access at https://link.springer.com/article/10.1007/s12665-026-12901-9
Environmental Earth Sciences 85:165(2026)
Filed Under: Demonstrations
Filed Under: Demonstrations
Alternating time domain induced polarization (TDIP) measurements and injection/pumping operations were conducted at a CHCl3-contaminated weathered andesite site. Full-decay TDIP data were inverted and correlated with groundwater sampling to reflect contaminant solubilization and reagent distribution. Interpretation results demonstrated that TDIP provided spatially continuous electrical imaging in the entire remediation volume, capturing the footprints of CHCl3-contaminated groundwater and the remediation reagent. The injected reagent exhibited strong conductivity and polarization contrasts with contaminated groundwater, confirming its spread across most of the weathered andesite layer. Thresholds of m=50 mV/V delineated CHCl3 contamination zones exceeding the regulatory limit of 300 µg/L. Reagent spreading along profiles revealed preferential flow paths within highly permeable fracture zones. Chargeability reduction correlated with DNAPL desorption showed >90% removal efficiency in groundwater samples, although residual contamination persisted in heavily contaminated zones. Microemulsion flushing effectively enhanced DNAPL solubilization, while weathered andesite medium and excessively high injection velocity limited remediation effectiveness. This article is Open Access at https://link.springer.com/article/10.1007/s12665-026-12901-9
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