Remobilization of heavy metals during the resuspension of Liangshui River sediments using an annular flume

Huang, Jianzhi; Ge, Xiaopeng; Yang, Xiaofang; Zheng, Bizhang; Wang, Dongsheng

doi:10.1007/s11434-012-5370-1

Cited by 25 publications

(14 citation statements)

References 22 publications

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“…The annular flume can change distance parameters into time parameters to ensure the infinite length of hydraulic conditions for deposition distance requirements of the fine particle sediment, and it will not disturb the flocculation structure and vertical distribution of sediment concentration [17,18]. Straight flume provides enough length for sediment settlement along the distance.…”

Section: Test Apparatuses and Methodsmentioning

confidence: 99%

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Zhu

Cheng²,

et al. 2017

Acta Mech. Sin.

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Vertical distribution processes of sediment contaminants in water were studied by flume experiments. Experimental results show that settling velocity of sediment particles and turbulence characteristics are the major hydrodynamic factors impacting distribution of pollutants, especially near the bottom where particle diameter is similar in size to vortex structure. Sediment distribution was uniform along the distance, while contaminant distribution slightly lagged behind the sediment. The smaller the initial sediment concentration was, the more time it took to achieve a uniform concentration distribution for suspended sediment. A contaminants transportation equation was established depending on mass conservation equations. Two mathematical estimation models of pollutant distribution in the overlying water considering adsorption and desorption were devised based on vertical distribution of suspended sediment: equilibrium partition model and dynamic micro-diffusion model. The ratio of time scale between the sediment movement and sorption can be used as the index of the models. When this ratio was large, the equilibrium assumption was reasonable, but when it was small, it might require dynamic micro-diffusion model.

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Section: Test Apparatuses and Methodsmentioning

confidence: 99%

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Zhu

Cheng²,

et al. 2017

Acta Mech. Sin.

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“…The results tentatively suggest that the filterable phase of metals may contain small materials, such as colloidal fractions, which can pass through filter membranes with metals adsorbed in them. The same speculation was put forward by two previous studies (Huang et al, 2012;Kalnejais et al, 2010). The researchers used a polycarbonate 0.015 μm filter (Nucleopore) to filter colloidal fractions.…”

Section: Discussionmentioning

confidence: 79%

“…The manner in which metal reaches equilibrium conditions is a long-term process. Many studies have focused on the adsorption and release of metal over short time periods (Cantwell et al, 2008;Huang et al, 2012;Kalnejais et al, 2010;Zheng et al, 2012). For this reason, it is very important to use an experimental process that can simulate natural hydrodynamic conditions in assessments of the characteristics of metals in balance.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Long Term Hydrodynamic Conditions on the Release of Metals from Contaminated Sediments in Taihu Lake, China

Wang¹,

Geng²,

Wang³

et al. 2016

J ENVIRON INFORM

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ABSTRACT. The effects of hydrodynamic conditions on sediment geochemistry, suspended solids, and the release of metal from metal-contaminated sediments were analyzed in a 23-day lab experiment involving two different experimental treatments (14 cm/s and 3.2 cm/s). At seven different points in time (after 0, 1, 3, 6, 10, 16, and 23 days) the sediment and water physical-chemical conditions and the amount of metal released into the surface water were determined. The amounts of filterable metals in the surface water increased by a factor of 21 and 4.1 (Cd), 10 and 1.7 (Pb), 13 and 1.8 (Cu), 3.6 and 1.7 (Cr), 3.7 and 1.5 (Ni), 11 and 4.7 (Fe), and 7.2 and 0.12 (Mn) times in the 14 cm/s and 3.2 cm/s treatments, respectively, after 23 days. Cr was the metal that bound most strongly to suspended solids, and Cd was the most readily released into the surface water. The metal equilibrium between dissolved and solid states was reached approximately 10 days after the experiment began. Pb required the longest time to reach equilibrium, whereas Cu required the least. Mn was the most easily affected by the hydrodynamic conditions. Results indicated that hydrodynamic conditions can dramatically enhance the mobility of metals, which may result in the release of sediment-bound metals to the surface water, and different metals show different characteristics during the release.

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“…This suspension may promote the release of heavy metals accumulated in bottom sediments into overlying water and result in a rapid metal load increase in the water column. At present, some researchers ( e.g ., Zheng et al , Huang et al ) have studied the release of heavy metals from deposited sediments. Zheng et al had ever explored the distribution of heavy metals in water and suspended particulate matter during the resuspension processes in Taihu Lake .…”

Section: Introductionmentioning

confidence: 99%

“…Zheng et al had ever explored the distribution of heavy metals in water and suspended particulate matter during the resuspension processes in Taihu Lake . Huang et al conducted a laboratory experiment and investigated the release and transport mechanisms of heavy metals (Ni, Cr, Cu, and Pb) from sediments into the overlying water column with a velocity ranging from 0.15 to 0.35 m s −1 . These results have made contributions to the understanding of the properties for released heavy metals, but most of them were focused on establishing the relationships between metal release rate and water flow velocity and few attention has been paid to exploring the transportation mechanisms among different metal forms under varied shear stress.…”

Section: Introductionmentioning

confidence: 99%

Transport Dynamics of Cr and Zn Between Deposited Sediment and Overlying Water

Wang

Zhou

Xiao

2016

CLEAN Soil Air Water

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Jinshan Lake, a typical river-connected lake located at middle-lower reaches of the Yangtze River, was selected as the study area. By field investigation and laboratory annular flume experiment, Cr and Zn migration mechanism between sediment and overlying water was quantitatively analyzed under different water depth and shear stress conditions. The results showed that (i) the content of Zn and Cr in the sediment dropped obviously at shear stress of >0.05 N m À1 . Zn was more likely to release from the sediment than Cr; (ii) For weak flow disturbance, a downward trend was observed for the dissolved Cr concentration due to the strong adsorption effects of fine particles with large specific surface areas on heavy metals. Dissolved Zn varied more greatly than Cr, because the conversion process between dissolved Zn and the particulate form was influenced to some extent by suspended sediment content; (iii) Under both weak and strong disturbance conditions the increasing rate of particulate Zn in overlying water was lower than Cr, which could demonstrate that Cr was more likely to be adsorbed to suspended sediment in the overlying water than Zn.

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Remobilization of heavy metals during the resuspension of Liangshui River sediments using an annular flume

Cited by 25 publications

References 22 publications

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

Evaluating the Impact of Long Term Hydrodynamic Conditions on the Release of Metals from Contaminated Sediments in Taihu Lake, China

Transport Dynamics of Cr and Zn Between Deposited Sediment and Overlying Water

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