Zhou, Wan-Huan, Liu, Fuming, Yi, Shuping, Chen, Yong-Zhan, Geng, Xueyu and Zheng, Chunmiao (2018) Simultaneous stabilization of Pb and improvement of soil strength using nZVI. Science of The Total Environment . doi:10.1016/j.scitotenv.2018.09.146 (In Press)

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Abstract

This study demonstrates the feasibility of nanoscale Zero-Valent Iron (nZVI) for simultaneous stabilization of Pb and improvement of soil strength via batch experiments. The soil samples were prepared using slurry and pre-consolidation method at nZVI doses of 0.2%, 1%, 5%, and 10% (by dry weight). The physicochemical and geotechnical properties of Pb-contaminated soil treated by nZVI were analyzed. The results indicate that the contamination of Pb(II) resulted in a notable reduction in the undrained shear strength of soil from 16.85 kPa to 7.25 kPa. As expected, the Pb in exchangeable and carbonate-bound fractions decreased significantly with the increasing doses of nZVI. Meanwhile, the undrained shear strength of Pb-contaminated soil enhanced substantially as the increase of nZVI, from 25.83 kPa (0.2% nZVI treatment) to 69.33 kPa (10% nZVI treatment). An abundance of bubbles, generated from the oxidation of nZVI, was recorded. The mechanisms for simultaneous stabilization of Pb and soil improvement primarily include: 1) the precipitation and transformation of Pb-/Fe-hydrated oxides on the soil particles and their induced bounding effects; 2) the increased drainage capability of soil as the occupation of nZVI aggregates and bubbles in the macropores space and 3) the lower soil density derived from the increase in microbubbles retained in the soil. This study is provided to facilitate the application of nZVI in the redevelopment of contaminated soil.

Item Type:	Journal Article
Subjects:	T Technology > TD Environmental technology. Sanitary engineering
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Soils -- Lead content, Soil pollution, Nanoparticles
Journal or Publication Title:	Science of The Total Environment
Publisher:	Elsevier Science BV
ISSN:	0048-9697
Official Date:	12 September 2018
Dates:	Date Event 12 September 2018 Available 11 September 2018 Accepted
Date of first compliant deposit:	18 September 2018
DOI:	10.1016/j.scitotenv.2018.09.146
Status:	Peer Reviewed
Publication Status:	In Press
Access rights to Published version:	Restricted or Subscription Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID 125/2014/A3 Macau University of Science and Technology Foundation UNSPECIFIED MYRG2015-001 12-FST Universidade de Macau http://dx.doi.org/10.13039/501100004733 KQTD2016022619584022 South University of Science and Technology of China http://dx.doi.org/10.13039/501100008100 JCYJ20160429191638556 Shenzhen Basic Research Plan UNSPECIFIED UNSPECIFIED South University of Science and Technology of China http://dx.doi.org/10.13039/501100008100

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