Causes and ecological effects of resuspended contaminated sediments (RCS) in marine environments

Roberts, David A.

doi:10.1016/j.envint.2011.11.013

Cited by 190 publications

(83 citation statements)

References 117 publications

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“…While resuspension events may be short lived, according to extrapolated results from a laboratory-based erosion chamber, metals with strong peaks in release are an important contributor to the calculated annual sediment metal load, releasing dissolved species to the overlying oxic water (Kalnejais et al, 2010). The ecological effect of resuspended contaminated sediment in marine environments is complex (Roberts, 2012); however, the liberation of sediment-bound contaminates is an important problem in mine waste management where resuspension and entrainment of sediment particles by wind-induced motions (e.g., waves and currents) occur (see review by Eggleton and Thomas, 2004 In shallow coastal waters, like CH, resuspension events can occur frequently due to wind-and wave-induced bottom stresses. In contrast to some studies linking rain to coral metal uptake (e.g., Ramos et al, 2009), CH trace metal variability was not related to cumulative annual precipitation, presumably given the lack of runoff on Bermuda.…”

Section: Castle Harbourmentioning

confidence: 99%

Environmental assessment of metal exposure to corals living in Castle Harbour, Bermuda

et al. 2013

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Environmental contamination in Castle Harbour, Bermuda, has been linked to the dissolution and leaching of contaminants from the adjacent marine landfill. This study expands the evidence for environmental impact of leachate from the landfill by quantitatively demonstrating elevated metal uptake over the last 30 years in corals growing in Castle Harbour. Coral Pb/Ca, Zn/Ca and Mn/Ca ratios and total Hg concentrations are elevated relative to an adjacent control site in John Smith's Bay. The temporal variability in the Castle Harbour coral records suggests that while the landfill has increased in size over the last 35 years, the dominant input of metals is through periodic leaching of contaminants from the municipal landfill and surrounding sediment. Elevated contaminants in the surrounding sediment suggest that resuspension is an important transport medium for transferring heavy metals to corals. Increased winds, particularly during the 1990s, were accompanied by higher coral metal composition at Castle Harbour. Coupled with wind-induced resuspension, interannual changes in sea level within the Harbour can lead to increased bioavailability of sediment-bound metals and subsequent coral metal assimilation. At John Smith's Bay, large scale convective mixing may be driving interannual metal variability in the coral record rather than impacts from land-based activities. Results from this study provide important insights into the coupling of natural variability and anthropogenic input of contaminants to the nearshore environment.Published by Elsevier B.V.

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Section: Castle Harbourmentioning

confidence: 99%

Environmental assessment of metal exposure to corals living in Castle Harbour, Bermuda

et al. 2013

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“…In the present work, the collected sediments were in most cases classified as C and >C suggesting that according to the Venice Protocol, treatment/remediation after dredging should be carried out in Oskarshamn in order to avoid toxicological effects of re-suspended contaminated sediments. Roberts [15] has reported that re-suspension of contaminated sediments is a frequent cause of incessant ecological risks to marine habitats. Even though, Elander & Larson [6] demonstrated that stabilized sediments can be used as low cost materials in the harbor, the criteria becomes even more critical when persistent organic pollutants are added to the list of potential stressors in which is the case of Oskarshamn that is known to have besides toxic metals, the presence of dioxin, PCB, and TBT [5,16].…”

Section: Figure 2 the Average Percentage Of Element Fractionation Imentioning

confidence: 99%

Sediment Mining

et al. 2017

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The main dilemma of contaminated sediments has been the proper management with reduced environmental footprints. Furthermore, by considering the fact that global warming and climate change may complicate the choice of management options, finding appropriate solutions become extremely critical. In the present work, mining of contaminated sediments to recover valuable constituents such as metals and nutrients is proposed as sustainable strategy, both through enhancing resilience of ecosystem and remediation. Contaminated sediments in the Oskarshamn harbor, southeast of Sweden were collected and analyzed through a modified sequential extraction in order to evaluate the feasibility of metals recovery. The results have shown that among different metals present in the sediments, Cu and Pb can be initially considered as economically feasible to recover. The shifting in the concept of dredging and further remediation of contaminated sediments towards sediment mining and recover of valuable metals can be considered in the near future as a sustainable strategy to tackle contaminated harbor/ports areas. However, it must be highlighted that short and long-term environmental impacts related to such activities should be addressed.

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“…Elevated levels of sediment contamination (e.g., high heavy metal concentrations on fine sediment) are known to cause ecotoxicity and degradation of water quality, ecosystem services and biodiversity [9]. Contaminated sediment can result in both direct and indirect impacts on the receiving waterways' aquatic ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Contamination of Detained Sediment in Sustainable Urban Drainage Systems

Allen¹,

Haynes²,

Arthur³

2017

Water

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Adsorption is a key water pollution remediation measure used to achieve stormwater quality improvement in Sustainable urban Drainage Systems (SuDS). The level of contamination of detained sediment within SuDS assets is not well documented, with published investigations limited to specific contaminant occurrence in ponds, wetlands or infiltration devices (bioretention cells) and generally focused on solute or suspended sediment. Guidance on contamination threshold levels and potential deposited sediment contamination information is not included in current UK SuDS design or maintenance guidance, primarily due to a lack of evidence and understanding. There is a need to understand possible deposited sediment contamination levels in SuDS, specifically in relation to sediment removal maintenance activities and potential impact on receiving waterways of conveyed sediment. Thus, the objective of the research presented herein was to identify what major elements and trace metals were observable in (the investigated) SuDS assets detained sediment, the concentration of these major elements and trace metals and whether they met/surpassed ecotoxicity or contaminated land thresholds. The research presented here provides evidence of investigated SuDS sediment major element and trace metal levels to help inform guidance and maintenance needs, and presents a new methodology to identify the general cause (anthropocentric land use) and extent of detained SuDS fine urban sediment contamination through use of a contamination matrix.

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Causes and ecological effects of resuspended contaminated sediments (RCS) in marine environments

Cited by 190 publications

References 117 publications

Environmental assessment of metal exposure to corals living in Castle Harbour, Bermuda

Environmental assessment of metal exposure to corals living in Castle Harbour, Bermuda

Sediment Mining

Contamination of Detained Sediment in Sustainable Urban Drainage Systems

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