In situ simulation of thin-layer dredging effects on sediment metal release across the sediment-water interface
文献类型： 外文期刊
作者： Yu, Juhua 1 ; Chen, Qiuwen 1 ; Zhang, Jianyun 1 ; Zhong, Jicheng 4 ; Fan, Chengxin; Hu, Liuming 2 ; Shi, Wenqing 1 ; Y 1 ;
作者机构： 1.Nanjing Hydraul Res Inst, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210029, Jiangsu, Peoples R China
2.Nanjing Hydraul Res Inst, Ctr Ecoenvironm Res, Nanjing 210029, Jiangsu, Peoples R China
3.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350013, Fujian, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, P
关键词： Sediment dredging; Metal bioavailability; Sediment-water interface (SWI); Diffusive gradient in thin films (DGT)
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）
ISSN： 0048-9697
年卷期： 2019 年 658 卷
页码：
收录情况： SCI
摘要： Dredging is widely applied to remediate contaminated sediments in aquatic ecosystems. However, the efficiency of thin-layer dredging for metal pollution control remains uncertain and even controversial. This study conducted an in-situ simulation experiment in Lake Taihu to investigate dredging effects on sediment metal release based on metal fractions, diffusion flux and kinetics parameters of metal resupply, using diffusive gradient in thin films (DGT), multi-microelectrode, and European Community Bureau of Reference (BCR) sequential extraction scheme. Results indicated that the exchange fluxes of metals did not necessarily correspond to total sediment metal concentrations or the contents of different sequentially-extracted metal fractions; there were appreciable decreases in Ni, Cd, Cu and Zn in terms of total sediment metal concentrations and metal fractions, whereas the bioavailability and release fluxes of labile Ni, Cu and Zn (but not Cd) were all notably promoted (by 136, 128 and 149%, respectively) in dredged area compared to those in un-dredged sediments. Further analysis on the kinetics of metal resupply by DGT technique and DGT-induced fluxes in sediments model (DIES) showed higher concentrations of labile metals, with a larger resupply ability from sediments after dredging. Therefore, thin-layer dredging had the possibility to increase metal release from sediments to the water column. This was attributed to the remobilization of metal sulfides in anoxic deep sediments, as oxidation increased after dredging due to the introduction of oxygenated water, causing subsequent dissolution of sulfide-bound metals. In conclusion, dredging may not mitigate metal contamination, although it can reduce the total pollution load. Our findings indicated dual effects of dredging and provided new insights into the remobilization mechanism of metal release induced by dredging. (C) 2018 Elsevier B.V. All rights reserved.
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