Technical Protocol for Evaluating Natural Attenuation of Chlorinated Solvents in Groundwater. Revision 1.

Wiedemeier, Todd H.; Wilson, John T.; Hansen, J. E.; Chapelle, Francis H.; Swanson, Matthew A.

doi:10.21236/ada324060

Cited by 147 publications

(236 citation statements)

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“…However, this natural attenuation is probably limited by the absence of readily available electron donors to support the dechlorination, since control soil incubations without lactate showed only very slow dechlorination. The lack of electron donors is a typical limiting factor for natural attenuation by means of reductive dehalogenation of compounds, such as chlorinated ethenes and polychlorinated aromatics (Middeldorp et al 1998;Sewell & Gibson 1991;Van Aalst-Van Leeuwen et al 1998;Wiedemeier et al 1997). Several electron donors, including complex mixtures of organic compounds such as yeast extract and landfill leachate, supported dechlorination of b-HCH.…”

Section: Discussionmentioning

confidence: 99%

Reductive dechlorination of hexachlorocyclohexane (HCH) isomers in soil under anaerobic conditions

et al. 2005

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The biological anaerobic reductive dechlorination of b-hexachlorocyclohexane under methanogenic conditions was tested in a number of contaminated soil samples from two locations in the Netherlands. Soils from a heavily polluted location showed rapid dechlorination of b-hexachlorocyclohexane to benzene and chlorobenzene with lactate as electron donor. Soils from an adjacent slightly polluted location did not show substantial dechlorination of b-hexachlorocyclohexane within 4 months. A heavily polluted sample was selected to optimise the dechlorination. All tested hexachlorocyclohexane isomers (a-, b-, c-, and d-), either added separately or simultaneously, were dechlorinated in this soil sample. The most rapid dechlorination was observed at a temperature of 30°C. Dechlorination of b-hexachlorocyclohexane was observed with acetate, propionate, lactate, methanol, H 2 , yeast extract and landfill leachate as electron donors. In a soil percolation column, packed with a selected heavily polluted soil sample, the presence of 10 mM sulphate in the influent led to simultaneous dechlorination of b-hexachlorocyclohexane and sulphate reduction. When the column was fed with 10 mM nitrate instead of sulphate, dechlorination ceased immediately. After omitting nitrate from the influent, dechlorination activity recovered in about 1 month. Also in a separate column, the addition of nitrate from the start of the experiment did not result in dechlorination of b-HCH. The significance of these experiments for in situ bioremediation of polluted soils is discussed.

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Section: Discussionmentioning

confidence: 99%

Reductive dechlorination of hexachlorocyclohexane (HCH) isomers in soil under anaerobic conditions

et al. 2005

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“…Aerobic microbial activity in environments with high bioavailable electron donor (organic carbon) can lead to rapid oxygen depletion and the onset of reducing conditions immediately following saturation. Extended experience in groundwater remediation has demonstrated the onset of substantial anaerobic activity at dissolved oxygen concentrations below 0.5 mg L -1 (Barcelona, 1994;Chapelle et al, 1995;Wiedemeier et al, 1998). Such conditions are routinely satisfied in wetland environments, particularly in peatland and organic rich bottomland floodplains, (Grigal, 2002(Grigal, , 2003 and wetlands are recognized areas of Hg methylation and elevated MeHg concentrations Bradley et al, 2010;Brigham et al, 2009;Grigal, 2002Grigal, , 2003Hurley et al, 1995;St.…”

Section: Hydrologic Controls On Hg Methylationmentioning

confidence: 99%

Hydrology and Methylmercury Availability in Coastal Plain Streams

Bradley¹,

Journey²

2012

Water Resources Management and Modeling

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“…For example, aerobically degradable contaminants can rapidly deplete oxygen in the subsurface; this results in anaerobic conditions that can limit the degradation of the remaining contaminants. Alternatively, biodegradable compounds can promote co-metabolic degradation of more recalcitrant compounds such as chlorinated solvents (46). The toxicity and mass of resultant products should also be considered in allocating costs associated with parent biodegradable compounds.…”

Section: Rankings Of Common Carcinogensmentioning

confidence: 99%

Allocating Cleanup Costs at Hazardous Waste Sites

Ram¹,

Wiest²,

Davis³

2005

Environ. Sci. Technol.

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Cleanup Costs at WASTE Sites Most people agree that Superfund sites and other complex, multiparty, hazardous waste sites that pose risks to human health and the environment should be remediated. However, the process of apportioning cleanup costs is often disputed among the potentially responsible parties (PRPs). As the available state and federal funding for site cleanup has diminished, pressure has increased for PRP-funded cleanups. Allocating uncertain cleanup costs in a timely, equitable, and mutually acceptable manner among numerous PRPs with different connections to the site, especially given varying legal interpretations and limited data, creates a difficult dilemma. Costly and protracted litigation to determine cost shares is an increasingly unattractive option and provides a strong incentive for devising a fair, understandable, and efficient privately administered approach to allocating costs among PRPs. This article outlines such an approach.Apportioning costs among potentially responsible parties is complicated but can be done with allocation formulas.

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Technical Protocol for Evaluating Natural Attenuation of Chlorinated Solvents in Groundwater. Revision 1.

Cited by 147 publications

References 0 publications

Reductive dechlorination of hexachlorocyclohexane (HCH) isomers in soil under anaerobic conditions

Reductive dechlorination of hexachlorocyclohexane (HCH) isomers in soil under anaerobic conditions

Hydrology and Methylmercury Availability in Coastal Plain Streams

Allocating Cleanup Costs at Hazardous Waste Sites

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