PAH-Contaminated Sediment Remediation: An Overview of a Proposed Large Scale Clean-up in a Freshwater Harbour

2012 ◽  
pp. 136-158 ◽  
Author(s):  
Matthew Graham ◽  
Erin Hartman ◽  
Rupert Joyner ◽  
Roger Santiago
Keyword(s):  
Large Scale ◽  
Contaminated Sediment ◽  
Sediment Remediation

scholarly journals Using FlFFF and aTEM to determine trace metal–nanoparticle associations in riverbed sediment

2010 ◽  
Vol 7 (1) ◽  
pp. 82 ◽  
Author(s):  
K. L. Plathe ◽  
F. von der Kammer ◽  
M. Hassellöv ◽  
J. Moore ◽  
M. Murayama ◽  
...  
Keyword(s):  
Trace Metals ◽  
Toxic Metals ◽  
Inductively Coupled Plasma ◽  
Large Scale ◽  
Size Fraction ◽  
Metal Nanoparticle ◽  
Contaminated Sediment ◽  
Inductively Coupled ◽  
Clark Fork River ◽  
Nano Size

Environmental context. Determining associations between trace metals and nanoparticles in contaminated systems is important in order to make decisions regarding remediation. This study analysed contaminated sediment from the Clark Fork River Superfund Site and discovered that in the <1-μm fraction the trace metals were almost exclusively associated with nanoparticulate Fe and Ti oxides. This information is relevant because nanoparticles are often more reactive and show altered properties compared with their bulk equivalents, therefore affecting metal toxicity and bioavailability. Abstract. Analytical transmission electron microscopy (aTEM) and flow field flow fractionation (FlFFF) coupled to multi-angle laser light scattering (MALLS) and high-resolution inductively coupled plasma mass spectroscopy (HR-ICPMS) were utilised to elucidate relationships between trace metals and nanoparticles in contaminated sediment. Samples were obtained from the Clark Fork River (Montana, USA), where a large-scale dam removal project has released reservoir sediment contaminated with toxic trace metals (namely Pb, Zn, Cu and As) which had accumulated from a century of mining activities upstream. An aqueous extraction method was used to recover nanoparticles from the sediment for examination; FlFFF results indicate that the toxic metals are held in the nano-size fraction of the sediment and their peak shapes and size distributions correlate best with those for Fe and Ti. TEM data confirms this on a single nanoparticle scale; the toxic metals were found almost exclusively associated with nano-size oxide minerals, most commonly brookite, goethite and lepidocrocite.

scholarly journals A comparative analysis of practitioners' experience in sediment remediation projects to highlight best practices

2018 ◽  
Vol 54 (1) ◽  
pp. 10-33 ◽  
Author(s):  
Zobia Jawed ◽  
Gail Krantzberg
Keyword(s):  
Technology Development ◽  
Political Support ◽  
Contaminated Site ◽  
Consensus Building ◽  
Contaminated Sediment ◽  
Sediment Remediation ◽  
Social Challenges ◽  
Polycyclic Aromatic ◽  
Stakeholder Consensus ◽  
Depth Interviews

Abstract The Randle Reef contaminated site, located in the southwest corner of Hamilton Harbour, is approximately 60 hectares in size. This site contains approximately 695,000 m3 of sediment contaminated with polycyclic aromatic hydrocarbons (PAHs) and metals. The complex Randle Reef sediment remediation project is finally coming to fruition after more than 30 years of study, discussion, collaborations, stakeholder consensus-building, and debate. This paper unravels the reasons behind the delays associated with implementing sediment management at the Randle Reef site. In-depth interviews with experts and professionals from organizations who are/were involved in the project were conducted to identify the nature of performance in five theme areas that are important for successful action namely: (1) participation of appropriate actors with common objectives; (2) funding and resources; (3) decision-making process; (4) research and technology development; and (5) public and political support. It is evident from this study that the hurdles to progress with addressing contaminated sediment sites involve technical, political, regulatory as well as social challenges. We offer potential solutions and a series of recommendations based on experts' first-hand experience with the management of such complex sites to inform how future remediation projects can overcome obstacles. This article has been made Open Access thanks to the kind support of CAWQ/ACQE (https://www.cawq.ca).

scholarly journals Enhanced bacterial quorum aggregation on a zeolite capping layer for sustainable inhibition of ammonium release from contaminated sediment

2017 ◽  
Vol 76 (12) ◽  
pp. 3428-3440 ◽  
Author(s):  
Jinlan Xu ◽  
Haiyang Zhang ◽  
Rong Zhao ◽  
Fanxing Kong
Keyword(s):  
Denitrifying Bacteria ◽  
Nitrifying Bacteria ◽  
Signal Molecules ◽  
Contaminated Sediment ◽  
Sediment Remediation ◽  
Overlying Water ◽  
Regeneration Rate ◽  
Capping Layer ◽  
Ammonium Removal ◽  
Bacterial Quorum

Abstract The main objective of this study was to investigate how signal molecules enhance bacterial quorum aggregation on a zeolite capping layer for sustainable inhibition of ammonium release from contaminated sediment. Sediment remediation experiments were carried out by using nitrifying bacteria (WGX10, WGX18), denitrifying bacteria (HF3, HF7) and two kinds of signal molecules (OHHL, C8-HSL). The results showed that nitrifying bacteria and denitrifying bacteria could significantly aggregate on zeolite after adding 1.0 μM OHHL at a C/N ratio of 7. The maximum ammonium removal of five times the amount of ammonium adsorbed was achieved when 1.0 μM OHHL was added at the C/N ratio of 7 (the bio-regeneration rate was up to 88.32%), which was 1.24–2.02 times the ammonium removal amount at C/N ratios of 3, 5, 9. The concentration of total nitrogen in the overlying water was no more than 0.8 mg/L during four rounds of sediment remediation experiments. In addition, the bio-regeneration rate was up to 71.20%, which achieved sustainable inhibition of ammonium release from contaminated sediment.

The Use of Subbottom Profiling in Refining Dredge Cuts for a Large-Scale Sediment Remediation Project

2017 ◽  
Vol 27 (2) ◽  
pp. 27-37
Author(s):  
Jill Coles ◽  
Matthew Graham ◽  
Brian Riggs
Keyword(s):  
Large Scale ◽  
Sediment Remediation ◽  
Subbottom Profiling

Modeling Active Capping Efficacy. 1. Metal and Organometal Contaminated Sediment Remediation

2008 ◽  
Vol 42 (23) ◽  
pp. 8922-8929 ◽  
Author(s):  
Priscilla Z. Viana ◽  
Ke Yin ◽  
Karl J. Rockne
Keyword(s):  
Contaminated Sediment ◽  
Sediment Remediation

Modeling the Effects and Uncertainties of Contaminated Sediment Remediation Scenarios in a Norwegian Fjord by Markov Chain Monte Carlo Simulation

2008 ◽  
Vol 42 (1) ◽  
pp. 200-206 ◽  
Author(s):  
Tuomo M. Saloranta ◽  
James M. Armitage ◽  
Heikki Haario ◽  
Kristoffer Næs ◽  
Ian T. Cousins ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Markov Chain ◽  
Markov Chain Monte Carlo ◽  
Contaminated Sediment ◽  
Sediment Remediation ◽  
Norwegian Fjord

Contaminated Sediment Remediation in the Laurentian Great Lakes: an Overview

2001 ◽  
Vol 36 (3) ◽  
pp. 351-365 ◽  
Author(s):  
Michael A. Zarull ◽  
John H. Hartig ◽  
Gail Krantzberg
Keyword(s):  
Great Lakes ◽  
Pollution Prevention ◽  
Source Control ◽  
Contaminated Sediment ◽  
Sediment Remediation ◽  
Management Options ◽  
Cooperative Agreements ◽  
In Situ Capping ◽  
And Control ◽  
River Mouths

Abstract Sediment contaminated with metals, persistent organic pollutants, nutrients and oxygen consuming substances can be found in many areas throughout the Great Lakes. However, the highest levels of sediment-associated contaminants and some of the worst manifestations of their resultant problems are found in the urban-industrial harbours, embayments and river mouths. Management options may include source control and natural recovery, removal and containment in a confined disposal facility or upland containment cell, removal and treatment, and in situ capping or treatment. Over the past 13 years (as of January 2000), over $580 million (U.S. and Canadian dollars combined) has been spent on 38 remediation projects in 19 separate areas. Not only have substantial resources been spent on sediment remediation, but the rate of expenditure has increased in recent years. In addition, substantially greater resources have been spent on pollution prevention and control of contaminants at their source as a prerequisite to sediment remediation. While most of the remediation has taken place as a result of regulatory actions, some has been the result of cooperative partnerships, demonstration projects and unilateral voluntary actions. In the future, cooperative agreements may be expected to play a greater role in resolving contaminated sediment problems.

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