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Article

Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests

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Graduate Program of Civil and Environmental Engineering, University of Passo Fundo, BR 285, km 292, Campus I, Passo Fundo, RS 99001-970, Brazil
2
Environmental Engineering Undergraduate Course, University of Passo Fundo, BR 285, km 292, Campus I, Passo Fundo, RS 99001-970, Brazil
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Graduate Program of Civil Engineering, Federal University of Rio Grande do Sul, Av. Osvaldo Aranha, 99 Porto Alegre, RS 90035-190, Brazil
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Department of Civil and Materials Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607, USA
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(3), 1001; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17031001
Received: 20 January 2020 / Revised: 28 January 2020 / Accepted: 3 February 2020 / Published: 5 February 2020
(This article belongs to the Special Issue Environmental Remediation of Soils and Groundwater)
This study investigated the reduction of hexavalent chromium (Cr(VI)) in a clayey residual soil using nanoscale zero-valent iron (nZVI). Five different ratios between nZVI and Cr(VI) were tested in batch tests (1000/11; 1000/23; 1000/35; 1000/70, and 1000/140 mg/mg) with the soil. With the selected proportion resulting best efficiency, the column tests were conducted, with molded specimens of 5 cm in diameter and 5 cm in height, with different nZVI injection pressures (10, 30, and 100 kPa). The soil was contaminated with 800 mg/kg of Cr(VI). The Cr(VI) and Cr(III) analyses were performed following the USEPA 3060A and USEPA 7196A standards. The results show that the reduction of Cr(VI) is dependent on the ratio between nZVI and Cr(VI), reaching 98% of efficiency. In column tests, the pressure of 30 kPa was the most efficient. As pressure increased, contaminant leaching increased. The permeability decreased over time due to the gradual increase in filtration and formation of oxyhydroxides, limiting nZVI mobility. Overall, nZVI is efficient for soil remediation with Cr(VI), but the injection process can spread the contaminated if not properly controlled during in situ application. View Full-Text
Keywords: soil remediation; nanotechnology; nanoscale zero-valent iron-(nZVI); hexavalent chromium-Cr(VI) soil remediation; nanotechnology; nanoscale zero-valent iron-(nZVI); hexavalent chromium-Cr(VI)
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MDPI and ACS Style

Reginatto, C.; Cecchin, I.; Heineck, K.S.; Thomé, A.; Reddy, K.R. Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests. Int. J. Environ. Res. Public Health 2020, 17, 1001. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17031001

AMA Style

Reginatto C, Cecchin I, Heineck KS, Thomé A, Reddy KR. Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests. International Journal of Environmental Research and Public Health. 2020; 17(3):1001. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17031001

Chicago/Turabian Style

Reginatto, Cleomar, Iziquiel Cecchin, Karla S. Heineck, Antonio Thomé, and Krishna R. Reddy 2020. "Use of Nanoscale Zero-Valent Iron for Remediation of Clayey Soil Contaminated with Hexavalent Chromium: Batch and Column Tests" International Journal of Environmental Research and Public Health 17, no. 3: 1001. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17031001

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