Resuspension of sediment, a new approach for remediation of contaminated sediment

Pourabadehei, Mehdi; Mulligan, Catherine N.

doi:10.1016/j.envpol.2016.01.082

Cited by 60 publications

(19 citation statements)

References 43 publications

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“…Overall, the content of PTEs in the sediments was higher than that in the soils, because PTEs absorbed in the soils are gradually transferred to the sediments where they accumulate [35]. However, our findings are contrary to those of previous studies [34], which can be attributed to local hydrogeological conditions [37]. Since the 1950s, the rise in temperature and reduced rainfall was clearly observed in the GSR region.…”

Section: Concentration and Distribution Of Potential Toxic Elements Icontrasting

confidence: 99%

Comprehensive Evaluation and Source Apportionment of Potential Toxic Elements in Soils and Sediments of Guishui River, Beijing

Wang

Gao

Yin

et al. 2019

Water

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This study investigated the concentrations and spatial distributions, ecological risks, and potential pollution sources of potential toxic elements (PTEs) in the soils and sediments collected from the Guishui River (GSR) in Beijing, China. Multiple methods for pollution assessment and source identification of PTEs in the sediments/soils were used, including analysis of the physicochemical properties, Geo-accumulation index (Igeo), potential ecological risk index (RI), Pearson correlation, principal component analysis (PCA), and Pb isotopic ratio analysis. The results showed that PTE concentrations in the sediments/soils were similar to the soil background values (BV) of Beijing, except for Cd. Maximum Cd concentrations in soils were far below the guideline of the Environmental Quality Standard for Soils in China. PTE concentrations in the soils were slightly higher than those in the sediments. Upstream to downstream of GSR, PTEs concentrations in the soils and sediments remained stable. Pollution assessment based on Igeo and RI indicated that Cd was the main contaminant with moderate pollution levels. PCA results showed that Cd originated from anthropogenic sources, mainly including pesticide and fertilizer residues, while other metals mainly originated from natural sources. Further source identification using Pb isotopic ratios and PCA indicated that Cu, Pb, and Zn in GSR originated from anthropogenic sources (aerosols and coal combustion) and atmospheric deposition was considered as the primary input pathway.

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Section: Concentration and Distribution Of Potential Toxic Elements Icontrasting

confidence: 99%

Comprehensive Evaluation and Source Apportionment of Potential Toxic Elements in Soils and Sediments of Guishui River, Beijing

Wang

Gao

Yin

et al. 2019

Water

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“…As such, the pollution is distributed in the density gradient, with unusual pollution concentration and release processes. Therefore, the re-suspension of contaminated sediments has received extensive attention [19], especially regarding the release of heavy metals [20], phosphorus [15], and organic matter [21], as well as the contaminant bioavailability and toxicity. The re-suspension method in situ could significantly reduce the concentration of contaminants without removing highly contaminated sediments.…”

Section: Introductionmentioning

confidence: 99%

Pollutants’ Release, Redistribution and Remediation of Black Smelly River Sediment Based on Re-Suspension and Deep Aeration of Sediment

Zhu

Zhang

et al. 2017

IJERPH

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Heavily polluted sediment is becoming an important part of water pollution, and this situation is particularly acute in developing countries. Sediment has gradually changed from being the pollution adsorbent to the release source and has influenced the water environment and public health. In this study, we evaluated the pollutant distribution in sediment in a heavily polluted river and agitated the sediment in a heavily polluted river to re-suspend it and re-release pollutants. We found that the levels of chemical oxygen demand (COD), NH4+-N, total nitrogen (TN), and total phosphorus (TP) in overlying water were significantly increased 60 min after agitation. The distribution of the pollutants in the sediment present high concentrations of pollutants congregated on top of the sediment after re-settling, and their distribution decreased with depth. Before agitation, the pollutants were randomly distributed throughout the sediment. Secondly, deep sediment aeration equipment (a micro-porous air diffuser) was installed during the process of sedimentation to study the remediation of the sediment by continuous aeration. The results revealed that deep sediment aeration after re-suspension significantly promoted the degradation of the pollutants both in overlying water and sediment, which also reduced the thickness of the sediment from 0.9 m to 0.6 m. Therefore, sediment aeration after suspension was efficient, and is a promising method for sediment remediation applications.

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“…By having higher concentrations of contaminants, finer sediments were targeted for removal from an aquatic environment by the suspension mechanism in a confined water column. Of seven selected heavy metals in the sediment (4% removed), concentrations were reduced for Cd and Pb as the main contaminants by 26 and 28 percent and the rest of the selected heavy metals (Cr, Ni, Cu, Zn, As) returned to natural levels (Pourabadehei and Mulligan, 2016b…”

Section: Laboratory-scale Ek Remediation Experimentsmentioning

confidence: 99%

Contaminated Aquatic Sediments

Jaglal¹

2017

Water Environment Research

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Resuspension of sediment, a new approach for remediation of contaminated sediment

Cited by 60 publications

References 43 publications

Comprehensive Evaluation and Source Apportionment of Potential Toxic Elements in Soils and Sediments of Guishui River, Beijing

Comprehensive Evaluation and Source Apportionment of Potential Toxic Elements in Soils and Sediments of Guishui River, Beijing

Pollutants’ Release, Redistribution and Remediation of Black Smelly River Sediment Based on Re-Suspension and Deep Aeration of Sediment

Contaminated Aquatic Sediments

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