U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

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).



The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.