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ENHANCED SOIL WASHING FOR THE REMEDIATION OF A BROWNFIELD POLLUTED BY PYRITE ASH
Fedje, K.K., C. Sierra, and J.R. Gallego.
Soil and Sediment Contamination: An International Journal 26(4):377-390(2017)
Soil from an abandoned/disused fertilizer plant polluted with pyrite ash containing heavy metal(loid)s (As, Cu, Pb, and Zn) was treated by physical and chemical washing. Exhaustive characterization of the soil-pollutant interaction determined the chemical nature (complex oxyhydroxides), potential mobility and bioavailability of the pollutants (very low), and the grain size fractions of preferential accumulation (silt-clay fraction comprised > 60% of the material and revealed > 2 ppm of Cu, Zn and Pb). Soil/ash samples were subjected to chemical washing trials, including leaching with 2 M HCl, 2 M NaOH, and acidic process water (pH around 0). The fraction below 63 µm was mechanically separated and exposed to chloridizing roasting with NaCl plus water leaching, which proved the most effective of all the procedures tested, particularly with regard to Cu and Zn recovery (up to 40% and 34%, respectively).
Soil and Sediment Contamination: An International Journal 26(4):377-390(2017)
Soil from an abandoned/disused fertilizer plant polluted with pyrite ash containing heavy metal(loid)s (As, Cu, Pb, and Zn) was treated by physical and chemical washing. Exhaustive characterization of the soil-pollutant interaction determined the chemical nature (complex oxyhydroxides), potential mobility and bioavailability of the pollutants (very low), and the grain size fractions of preferential accumulation (silt-clay fraction comprised > 60% of the material and revealed > 2 ppm of Cu, Zn and Pb). Soil/ash samples were subjected to chemical washing trials, including leaching with 2 M HCl, 2 M NaOH, and acidic process water (pH around 0). The fraction below 63 µm was mechanically separated and exposed to chloridizing roasting with NaCl plus water leaching, which proved the most effective of all the procedures tested, particularly with regard to Cu and Zn recovery (up to 40% and 34%, respectively).
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