Sorption of DDTs on biofilms, suspended particles and river sediments: effects of heavy metals

Heavy metals contaminated sediment has become a worldwide environmental issue due to its great harm to human and aquatic organisms. Thus, economical, effective, and environmentally-friendly remediation technologies are urgently needed. Among which, combined remediation technologies have attracted widespread attention for their unique advantages. This paper introduces combined remediation technologies based on physical-, chemical-, and bio-remediation of heavy metal polluted sediments. Firstly, the research progress in physical-chemical, bio-chemical, and inter-organismal (including plants, animals, microorganisms) remediation of heavy metal polluted sediments are summarized. Additionally, the paper analyzes the problems of the process of combined remediation of heavy metals in river sediments and outlooks the future development trends of remediation technologies. Overall, this review provides useful technology references for the control and treatment of heavy metal pollution in river sediments.

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Distribution and ecological risks of heavy metals in river sediments and overlying water in typical mining areas of China

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2019.07.029 ◽

2019 ◽

Vol 146 ◽

pp. 893-899 ◽

Cited By ~ 9

Author(s):

Ming Chen ◽

Fengguo Li ◽

Meixia Tao ◽

Lanwen Hu ◽

Yanli Shi ◽

...

Keyword(s):

Heavy Metals ◽

River Sediments ◽

Ecological Risks ◽

Overlying Water ◽

Mining Areas

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Flocculation-bio-treatment of heavy metals-vacuum preloading of the river sediments

Ecotoxicology and Environmental Safety ◽

10.1016/j.ecoenv.2020.110810 ◽

2020 ◽

Vol 201 ◽

pp. 110810

Author(s):

Linzhu Sun ◽

Yunyun Zheng ◽

Xiaoniu Yu

Keyword(s):

Heavy Metals ◽

River Sediments ◽

Vacuum Preloading

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Geochemistry pollution status and ecotoxicological risk assessment of heavy metals in the Pahang River sediment after the high magnitude of flood event

Hydrology Research ◽

10.2166/nh.2020.122 ◽

2020 ◽

Author(s):

K. Y. Lim ◽

N. A. Zakaria ◽

K. Y. Foo

Keyword(s):

Heavy Metals ◽

Ecological Risk ◽

River Sediment ◽

Risk Index ◽

River Sediments ◽

Sediment Quality ◽

Contamination Factor ◽

Potential Ecological Risk ◽

Flood Event ◽

Pollution Status

Abstract The present work is aimed at assessing the aftermath effects of the 2014 flood tragedy on the distribution, pollution status and ecological risks of the heavy metals deposited in the surface river sediment. A series of environmental pollution indexes, specifically the enrichment factor (EF), geo-accumulation index (Igeo), contamination factor (CF), modified degree of contamination (mCd), pollution load index (PLI), potential ecological risk index (PERI) and sediment quality guidelines (SQGs) have been adopted. Results revealed that the freshly deposited sediments collected soon after the flood event were dominated by Cu, Fe, Pb, Ni, Zn, Cr and Cd, with the average concentrations of 38.74, 16,892, 17.71, 4.65, 29.22, 42.36 and 0.29 mg/kg, respectively. According to the heavy metal pollution indexes, Pahang River sediments were moderately to severely contaminated with Pb, Ni, Cu, Zn and Cr, while Cd with the highest risk of 91.09 was the predominant element that illustrated an aesthetic ecological risk to the water body after the tragic flood event. The findings highlighted a critical deterioration of the heavy metals content, driven by the catastrophic flood event, which has drastically altered their geochemical cycles, sedimentary pollution status and biochemical balance of the river's environment.

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Multivariate analyses on heavy metal binding fractions of river sediments in Southern Taiwan

Water Science & Technology ◽

10.2166/wst.2000.0569 ◽

2000 ◽

Vol 42 (7-8) ◽

pp. 193-199 ◽

Cited By ~ 8

Author(s):

K. C. Yu ◽

C. Y. Chang ◽

L. J. Tsai ◽

S. T. Ho

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Organic Matter ◽

Metal Binding ◽

River Sediments ◽

Principal Component ◽

Fe Oxides ◽

Data Points ◽

Southern Taiwan ◽

Highly Correlated

This study depicts the amounts of heavy metals (Cu, Zn, Pb, Cr, Co, and Ni) bound to four geochemical compositions of sediments (carbonates, Mn oxides, Fe oxides, and organic matters), and the correlations between various geochemical compositions and their heavy-metal complexes. Hundreds of data, obtained from sediments of five main rivers (located in southern Taiwan), were analyzed by using multivariate analysis method. Among the four different geochemical compositions, the total amount of the six heavy metals bound to organic matter is the highest. Zn is easily bound to various geochemical compositions, especially carbonates in sediments of the Yenshui river and the Potzu river (i.e., the heavily heavy-metal polluted sediments); Cr, Pb, and Ni are mainly bound to both Fe oxides and organic matter; Cu has high affinity to organic matter. By performing principal component analyses, the data points of organic matter and both Pb and Cu associated with organic matter cluster together in sediments ofthe Peikang, the Potzu, and the Yenshui rivers, which indicates both Pb and Cu might be discharged from the same pollution sources in these rivers. Moreover, correlations between any two binding fractions of heavy metal associated with Fe oxides in different rivers are not consistent, which indicates some factors including the binding sites of Fe oxides, the extent of heavy metal pollution, binding competitions between heavy metals may affect the amounts of heavy metals bound to Fe oxides. Furthermore, it should be noted that the amount of Pb bound to Fe oxides is highly correlated with the amount of Fe oxides in sediments of the Peikang, the Potzu, and the Yenshui rivers.

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