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Inorganic contaminant fate assessment in zero-valent iron treatment walls

Komnitsas Konstantinos, Bartzas Georgios, Paspaliaris Ioannis

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Περίληψη

This article discusses the fate assessment of several inorganic contaminants in zero-valent iron treatment walls used for the cleanup of acidic plumes and the prevention of groundwater contamination in active or abandoned mixed sulphide and coal mining sites. The fate assessment of contaminants provides useful information for potential forensics investigations carried out in affected mining and waste disposal sites. Laboratory studies using sodium chloride as conventional tracer were carried out to identify transport-related issues and assess the performance and long-term reactivity of iron walls. Transport parameters, such as residence time, dispersion, and heterogeneity, were determined by fitting chloride breakthrough curves (BTCs) to the convection-dispersion equation using time moment analysis and the CXTFIT 2.1 curve-fitting software. First moment analysis of breakthrough curves revealed modest increase in pore-water velocity over time, indicative of decreasing porosity within the reactive mass, mainly due to the formation of mineral precipitates.Geochemical modeling of the process, including interactions between iron filings, heavy metal ions, and sulphates; interpretation of the ionic profiles; and calculation of porosity loss was also carried out by using the speciation/mass transfer computer code PHREEQC-2 and the WATEQ4F database.

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