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Simultaneous stabilization of Pb and improvement of soil strength using nZVI
Zhou W.-H.3; Liu F.2; Yi S.2; Chen Y.-Z.3; Geng X.4; Zheng C.2
2019-02-15
Source PublicationScience of the Total Environment
ISSN18791026 00489697
Volume651Pages:877-884
AbstractThis 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.
KeywordLead, contaminated soil nZVI Physicochemical property Undrained shear strength
DOI10.1016/j.scitotenv.2018.09.146
URLView the original
Indexed BySCI
Language英語
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000447915400087
PublisherELSEVIER SCIENCE BV
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Cited Times [WOS]:4   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control
2.Southern University of Science and Technology
3.Universidade de Macau
4.The University of Warwick
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Zhou W.-H.,Liu F.,Yi S.,et al. Simultaneous stabilization of Pb and improvement of soil strength using nZVI[J]. Science of the Total Environment,2019,651:877-884.
APA Zhou W.-H.,Liu F.,Yi S.,Chen Y.-Z.,Geng X.,&Zheng C..(2019).Simultaneous stabilization of Pb and improvement of soil strength using nZVI.Science of the Total Environment,651,877-884.
MLA Zhou W.-H.,et al."Simultaneous stabilization of Pb and improvement of soil strength using nZVI".Science of the Total Environment 651(2019):877-884.
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