Simultaneous stabilization of Pb and improvement of soil strength using nZVI

Zhou, Wan-Huan2; Liu, Fuming1,2,3; Yi, Shuping1,3; Chen, Yong-Zhan2; Geng, Xueyu4; Zheng, Chunmiao1,3

2019-02-15

10.1016/j.scitotenv.2018.09.146

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

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. (C) 2018 Elsevier B.V. All rights reserved.

nZVI Lead, contaminated soil Physicochemical property Undrained shear strength

SCI ; EI

英语

通讯

Marie Sklodowska-Curie Actions Research and Innovation Staff Exchange programme[778360]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000447915400087

ELSEVIER SCIENCE BV

20183905870224

Contamination ; Lead oxide ; Precipitation (chemical) ; Shear strength ; Soil mechanics ; Soil pollution ; Soils

Soils and Soil Mechanics:483.1 ; Chemical Operations:802.3 ; Chemical Products Generally:804

ENVIRONMENT/ECOLOGY

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen, Peoples R China
2.Univ Macau, Fac Sci & Technol, Dept Civil & Environm Engn, Macau, Peoples R China
3.Shenzhen Key Lab Soil & Groundwater Pollut Contro, Shenzhen, Peoples R China
4.Univ Warwick, Sch Engn, Geotech Engn, Coventry, W Midlands, England

Zhou, Wan-Huan,Liu, Fuming,Yi, Shuping,et al. Simultaneous stabilization of Pb and improvement of soil strength using nZVI[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,651:877-884.

Zhou, Wan-Huan,Liu, Fuming,Yi, Shuping,Chen, Yong-Zhan,Geng, Xueyu,&Zheng, Chunmiao.(2019).Simultaneous stabilization of Pb and improvement of soil strength using nZVI.SCIENCE OF THE TOTAL ENVIRONMENT,651,877-884.

Zhou, Wan-Huan,et al."Simultaneous stabilization of Pb and improvement of soil strength using nZVI".SCIENCE OF THE TOTAL ENVIRONMENT 651(2019):877-884.