In-situ immobilization of arsenic in the subsurface using ferrous chloride
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Date
2017
Authors
Roemer, Micha Erhard
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Abstract
At a military site in Northern Germany, the aquifer is contaminated by high quantities of arsenic (As) from chemical warfare agents (CWA) and their degradation products. Arsenic concentrations up to 9 mg L-1 were found (Krüger et al. 2008). In regards to this high degree of contamination, an in-situ arsenic remediation strategy using bivalent ferrous chloride (FeCl2) was evaluated. The field trial spanned almost two years, and a total of 2.3 kg of As was immobilized through the pilot plant. The objective of the present study was to design a reactive transport model for the arsenic immobilization field trial, which would provide a quantitative framework to evaluate As fate in the aquifer system and indicate the effectiveness of the remediation technology. The completed model couples physical and geochemical processes governing the fate of As at the site and is transferable to similar case studies that involve arsenic contamination.
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Keywords
Arsenic, Contamination, Groundwater, Modeling, Immobilization, Military site, Phreeqc, Feflow