Distribution and origination of zinc contamination in newly reclaimed heterogeneous dredger fills: Field investigation and numerical simulation

MARINE POLLUTION BULLETIN

卷:149

Article

Wu, Linbo¹  Wang, Jianxiu^1,2,3,5  Pei, Xiangjun³  Fogg, Graham E.⁴  Yang, Tianliang^5,6  Yan, Xuexin^5,6  Huang, Xinlei^5,6  Liu, Zipeng⁷  Qi, Rui¹ 

[1] Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China

[2] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China

[3] Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Sichuan, Peoples R China

[4] Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA

[5] Minist Land & Resources, Key Lab Land Subsidence Monitoring & Prevent, Shanghai 201204, Peoples R China

[6] Shanghai Inst Geol Survey, Shanghai 200072, Peoples R China

[7] Tongji Univ, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China

关键词: Land reclamation;    Heterogeneous dredger fills;    Zn contamination;    Field investigation;    Stochastic modeling;    Numerical simulation;   

DOI  :  10.1016/j.marpolbul.2019.110496

来源: Elsevier

【 摘 要 】

Heavy metal elements, including Zn, Cd, As, Ni, Cu, Pb and Cr, were detected in soils (no deeper than 75 m) from newly reclaimed zones of Shanghai, China. The Zn concentration exceeded soil quality limits. The Zn con-tamination was tested in both dredger fills and sedimentary layers ((1)(3-3),(2)(3), (4) and (5)(1-1)). However, it was not detected in layer (5)(1-2)-(9). PCA and HCA analysis show that exogenous Zn probably was the contaminant source of dredger fills before the fills were dredged from the neighboring waters. Stochastic heterogeneity of the dredger fills affects the Zn-depollution remarkably. Numerical simulations show both acid precipitation and widespread drainage channels in the zones contributed to Zn-decrease in the dredger fills no deeper than 1.2 m. Acid rainstorms work better than acid constant precipitation in Zn-remediation for layers below 0.4 m. To remove Zn contamination in deep dredger fills, un-consolidation of the fills should be utilized.

【 授权许可】

Free