Long-term effectiveness of sediment dredging on controlling the contamination of arsenic, selenium, and antimony

Sun, Qiang; Ding, Shiming; Chen, Musong; Gao, Shuaishuai; Lu, Guanghua; Wu, Yuexia; Gong, Maoqiong; Wang, Dan; Wang, Yan

doi:10.1016/j.envpol.2018.11.050

Cited by 29 publications

(12 citation statements)

References 51 publications

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“…Conventional dredging after six years only decreased dissolved As by 42% in the sediments of Meiliang Bay, Taihu Lake, China. 25 As for other passivation materials (Table S4†), 30 d aluminum sulfate (ALS), 32 d LMB, 60 d Ca(NO 3 ) 2 and 30 d Zr-LMB capping reduced dissolved As by 51.1, 31.9, 47.7 and 58.0% in the depths of −20, −50, −50 and −20 mm, respectively, while 30 d Zr-ATP could reduce dissolved As by 72.9% in the depth of −80 mm below the SWI. Compared with previous studies, 50 the maximum reduction efficiencies of new Zr-LMB capping in As-polluted sediments (0, 10 and 20 mg kg −1 ) were only 58.0, 74.4 and 67.5% in the depth range of 0–20 mm below the SWI.…”

Section: Resultsmentioning

confidence: 99%

“…22 As an indispensable portion of shallow lakes, the sediments can not only help accumulate the pollutants from lake water but also release them into the overlying water via dissolution, desorption and biodegradation. 23,24 A number of sediment treatment technologies have been developed to reduce As mobility in the sediments, 25–27 among which in situ immobilization is considered an ideal technology because of its uncomplicated operation and high efficiency. 28 Up to now, substantial in situ immobilization agents including metals (nano zero-valent iron), 29 metal oxides, 30 nitrate, 31 foliar fertilizers, 32 clay minerals, 21 biochar, 33 lignin 34 and combination of materials 35 have appeared one after another.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced remediation of As(iii) and As(v) by new zirconium-loaded attapulgite and its mechanisms in the aquatic environment

Wang¹,

Sun²,

Gao³

et al. 2023

Environ. Sci.: Water Res. Technol.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced remediation of As(iii) and As(v) by new zirconium-loaded attapulgite and its mechanisms in the aquatic environment

Wang¹,

Sun²,

Gao³

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…Meiliang Bay is located in the north of Lake Taihu with a surface area of about 100 km 2 and an average depth of 2.3 m. The discharge of municipal wastewater and industrial sewage into the bay has resulted in serious levels of water pollution, with studies reporting the highest levels of heavy metal pollution in this area of Lake Taihu [20]. The sampling sites selected in this study were located in two adjacent regions of Meiliang Bay.…”

Section: Study Site and Samplingmentioning

confidence: 99%

The Long-Term Effects of Dredging on Chromium Pollution in the Sediment of Meiliang Bay, Lake Taihu, China

Gao

Xing

Ding

et al. 2021

Water

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Sediment dredging is a common remediation tool for polluted water bodies. However, the long-term effects of dredging on chromium (Cr) contamination remain unclear. This study was conducted to evaluate the long-term effects of sediment dredging on Cr contamination in Lake Taihu, six years after dredging was performed. In this study, high-resolution equilibrium dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) sampling techniques were used for sampling total dissolved Cr and DGT-labile Cr(VI) at the sediment water interface. The results show that the vertical averaged concentrations of total dissolved Cr in summer (112.6 ± 28.8 μg/L) and winter (115.3 ± 29.9 μg/L) in the non-dredged site were above the fisheries water quality standard (AEPC, 2002). They were 38% lower in overlying water and 20% lower in sediment pore water in the dredged site in winter, while in summer the reduction was not evident. The concentration of total dissolved Cr in the dredged site was significantly higher in spring and autumn than those in the non-dredged site, which was probably caused by the large rainfall and river discharge during the two seasons. The vertically averaged concentrations of DGT-labile Cr(VI) in both the non-dredged and dredged sites did not exceed the drinking water quality standard requirements (WHO, 1993). Modeling of DGT-induced fluxes from sediment into overlying water showed a higher response time (Tc) and lower adsorption rate (k1) and desorption rate (k−1) in the dredged site except in summer, indicating that sediment dredging decreased Cr mobility in sediments. Overall, these results confirm that sediment dredging decreased the risk of Cr contamination in winter in Lake Taihu.

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“…For example, the WHO determined this value to be at most 10 μgL -1 [4,5]. A group of elements (As, Sb, Se), including As, are listed by US-EPA as the major water pollutants, while As and Cr are qualified as the number one carcinogenic substances by IARC [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Adsorption Studies of Different Arsenic Species Using the Diffusive Gradients in Thin Film (DGT) Technique

Budak

2020

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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The amount of arsenic (As) in the earth increases every day and adversely affects the life of all living beings, including human health. Therefore, studies on the development of As determination methods are gradually gaining importance. The foundation of the Diffusive Gradients in Thin Film (DGT) technique addressed in this study is based on the diffusion process. The analyte to be determined passes through different layers in the DGT unit and reaches the adsorber gel layer. In the study presented, the gel obtained from iron (III) oxide (Fe2O3) was used as the adsorber layer. The use of the DGT technique in the amount determination of As(III) and As(V) species in the aqueous medium was examined and all the measurements performed during the experimental studies were observed to be made with an ICP-MS device. Different parameters were evaluated in terms of different pH values, ionic strength effects, gel layer thickness and the effects of the eluent materials and the most suitable working conditions were determined.

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Long-term effectiveness of sediment dredging on controlling the contamination of arsenic, selenium, and antimony

Cited by 29 publications

References 51 publications

Enhanced remediation of As(iii) and As(v) by new zirconium-loaded attapulgite and its mechanisms in the aquatic environment

Enhanced remediation of As(iii) and As(v) by new zirconium-loaded attapulgite and its mechanisms in the aquatic environment

The Long-Term Effects of Dredging on Chromium Pollution in the Sediment of Meiliang Bay, Lake Taihu, China

Investigation of Adsorption Studies of Different Arsenic Species Using the Diffusive Gradients in Thin Film (DGT) Technique

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