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NANOREMEDIATION AND LONG-TERM MONITORING OF BROWNFIELD SOIL HIGHLY POLLUTED WITH AS AND HG
Gil-Diaz, M., E. Rodriguez-Valdes, J. Alonso, D. Baragano, J.R. Gallego, and M.C. Lobo.
Science of the Total Environment 675:165-175(2019)

The capacity of NZVI for reducing the availability of As and Hg in brownfield soils was evaluated at pilot scale to determine the immobilization stability of As and Hg over a 32-month period. Two sub-areas (A and B) that differed in pollution load were selected, and a 5 m2 plot was treated with 2.5% NZVI (Nanofer 25S or NanoIron by weight) in each case. In sub-area A, which had a greater degree of pollution, a second application was performed 8 months after the first application. Overall, the treatment significantly reduced the availability of both As and Hg, after only 72 h, although treatment effectiveness was highly dependent on the degree of initial contamination. Concentrations of As and Hg in sub-area A decreased in TCLP extracts by 65% and 50%, respectively, whereas in sub-area B (with a lower level of pollution) As and Hg decreased by 70% and 80%, respectively. NZVI application at a dose of 2.5% appears to be an effective approach for the remediation of soils at this brownfield site, especially in sub-area B.



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