Earth Systems has designed and installed a Permeable Reactive Barrier (PRB) to intercept and contain surface runoff and shallow groundwater containing elevated dissolved arsenic from a derelict mine site.
The PRB removes soluble arsenic by adsorbing it to the reactive minerals. A suitable PRB substrate was identified and subjected to a series of geochemical and mineralogical tests.
The typical untreated (inflow) water is acid (pH ~3.5) with elevated concentrations of dissolved arsenic (20-60 mg/L), as well as elevated copper, cadmium, zinc, antimony, aluminium, and lead. Indicative water chemistry monitoring shows arsenic removal efficiencies of greater than 98%, and significant removal of other contaminants.
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