Understanding the dynamics of enhanced light non-aqueous phase liquids (LNAPL) remediation at a polluted site: Insights from hydrogeophysical findings and chemical evidence.

Autor: Ciampi P; Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; CERI Research Center, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy. Electronic address: paolo.ciampi@uniroma1.it., Cassiani G; Department of Geosciences, University of Padua, Via Gradenigo 6, 35131 Padua, Italy. Electronic address: giorgio.cassiani@unipd.it., Deidda GP; Department of Civil, Environmental Engineering and Architecture, University of Cagliari, via Marengo, 2, 09123 Cagliari, Italy. Electronic address: gpdeidda@unica.it., Esposito C; Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; CERI Research Center, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy. Electronic address: carlo.esposito@uniroma1.it., Rizzetto P; Logistic Headquarter of Italian Air Force, Viale dell'Università, 4, 00185 Rome, Italy. Electronic address: paolo.rizzetto@am.difesa.it., Pizzi A; Logistic Headquarter of Italian Air Force, Viale dell'Università, 4, 00185 Rome, Italy. Electronic address: andrea.pizzi@aeronautica.difesa.it., Papini MP; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy; CERI Research Center, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy. Electronic address: marco.petrangelipapini@uniroma1.it.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Jul 01; Vol. 932, pp. 172934. Date of Electronic Publication: 2024 May 03.
DOI: 10.1016/j.scitotenv.2024.172934
Abstrakt: This study intricately unfolds a pioneering methodology for remediating contaminants in a persistent light non-aqueous phase liquids (LNAPL)-contaminated site. The remediation strategy seamlessly integrates enhanced desorption and in-situ chemical oxidation (ISCO), orchestrating the injection of PetroCleanze® (a desorbent) and RegenOx® (an oxidizer) through meticulously designed wells. These injections, based on detailed geological and hydrogeological assessments, aim at mobilizing residual contaminants for subsequent extraction. Real-time subsurface dynamics are investigated through geophysical monitoring, employing electrical resistivity tomography (ERT) to trace reagent migration pathways via their effect on bulk electrical conductivity. The integration of groundwater sampling data aims at providing additional insights into the transformations of contaminants in the spatiotemporal context. Vivid two-dimensional time-lapse ERT sections showcase the evolution of resistivity anomalies, providing high-resolution evidence of the heterogeneity, dispersion pathways of desorbent and oxidant, and residual LNAPL mobilization. Hydrochemical analyses complement this, revealing effective mobilization processes with increasing aqueous concentrations of total petroleum hydrocarbons (TPH) over time. Speciation analysis unveils the intricate interplay of desorption and oxidation, portraying the dynamic fractionation of hydrocarbon components. The hydrogeophysical and data-driven framework not only delivers qualitative and quantitative insights into reagent and contaminant distribution but also enhances understanding of spatial and temporal physio-chemical changes during the remediation process. Time-lapse ERT visually narrates the reagent's journey through time, while chemical analyses depict the unfolding processes of desorption and oxidation across space and time. The coupling of hydrogeophysical and chemical findings pictures the transformations of pollutants following the sequence of product injection and the push and pull activities, capturing the removal of mobilized contaminants through hydraulic barrier wells. This enhanced understanding proves instrumental towards optimizing and tailoring remediation efforts, especially in heterogeneous environmental settings. This study establishes a new standard for a sophisticated and innovative contaminant remediation approach, advancing environmental practices through the harmonized analysis of geophysical and chemical data.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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