Transformation of Monoaromatic hydrocarbons to organic acids in anoxic groundwater environment

Cozzarelli, Isabelle M.; Eganhouse, Robert P.; Baedecker, Mary Jo

doi:10.1007/bf01890379

Cited by 163 publications

(83 citation statements)

References 16 publications

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“…For example, groundwater concentrations of aromatic hydrocarbons decreased substantially across the Fe(III) reduction zone downgradient from two sanitary landfills (Lyngkilde and Christensen 1992a;Rugge et al 1995). Similarly, large decreases in aromatic hydrocarbon concentrations have been observed downgradient from petroleum spill sites in areas where Fe(III) reduction is the dominant microbial process (Cozzarelli et al 1990;Baedecker et al 1993;Borden et al 1995). These geochemical studies suggest that contaminant-degradation processes coupled to microbial Fe(III) reduction can contribute substantially to the overall removal of contaminants from the subsurface.…”

Section: Evidence For Oxidation Of Aromatic Hydrocarbons With Reductimentioning

confidence: 81%

Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface

Lovley¹,

Anderson

2000

Hydrogeology Journal

154

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Dissimilatory Fe(III)-reducing microorganisms have the ability to destroy organic contaminants under anaerobic conditions by oxidizing them to carbon dioxide. Some Fe(III)-reducing microorganisms can also reductively dechlorinate chlorinated contaminants. Fe(III)-reducing microorganisms can reduce a variety of contaminant metals and convert them from soluble forms to forms that are likely to be immobilized in the subsurface. Studies in petroleum-contaminated aquifers have demonstrated that Fe(III)-reducing microorganisms can be effective agents in removing aromatic hydrocarbons from groundwater under anaerobic conditions. Laboratory studies have demonstrated the potential for Fe(III)-reducing microorganisms to remove uranium from contaminated groundwaters. The activity of Fe(III)-reducing microorganisms can be stimulated in several ways to enhance organic contaminant oxidation and metal reduction. Molecular analyses in both field and laboratory studies have demonstrated that microorganisms of the genus Geobacter become dominant members of the microbial community when Fe(III)-reducing conditions develop as the result of organic contamination, or when Fe(III) reduction is artificially stimulated. These results suggest that further understanding of the ecophysiology of Geobacter species would aid in better prediction of the natural attenuation of organic contaminants under anaerobic conditions and in the design of strategies for the bioremediation of subsurface metal contamination.RØsumØ Des micro-organismes simulant la rØduction du fer ont la capacitØ de dØtruire des polluants organiques dans des conditions anØrobies en les oxydant en dioxyde de carbone. Certains micro-organismes rØduc-teurs de fer peuvent aussi dØ-chlorer par rØduction des polluants chlorØs. Des micro-organismes rØducteurs de fer peuvent rØduire tout un ensemble de mØtaux polluants et les faire passer de formes solubles à des formes qui sont susceptibles d'tre immobilisØes dans le milieu souterrain. Des Øtudes d'aquifres polluØs par du pØtrole ont montrØ que des micro-organismes rØducteurs de fer peuvent tre des agents efficaces pour Øliminer les hydrocarbures aromatiques des eaux souterraines dans des conditions anØrobies. Des Øtudes en laboratoire ont montrØ que des micro-organismes rØducteurs de fer avaient la capacitØ d'Øliminer l'uranium d'eaux souterraines polluØes. L'activitØ de micro-organismes rØducteurs de fer peut tre stimulØe de diffØrentes manires pour augmenter l'oxydation de polluants organiques et la rØduction de mØtaux. Des analyses molØculaires concernant des Øtudes de terrain et de laboratoire ont montrØ que des microorganismes du genre Geobacter deviennent les membres dominants de la communautØ microbienne quand les conditions de rØduction en Fe(III) sont rØalisØes à la suite d'une pollution organique, ou lorsque la rØduction en Fe(III) est stimulØe artificiellement. Ces rØsultats laissent penser que des connaissances supplØ-mentaires sur l'Øcophysiologie des espces Geobacter devraient aider à une meilleure prØdiction...

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Section: Evidence For Oxidation Of Aromatic Hydrocarbons With Reductimentioning

confidence: 81%

Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface

Lovley¹,

Anderson

2000

Hydrogeology Journal

154

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“…Thorn and Aiken [1998] found large alkylaromatic oil constituents to be likely precursors to NVDOC, and these aromatic molecular structures may support shared enzyme use and competition. Furthermore, proposed anaerobic pathways for n-alkane degradation [Callaghan, 2013] and inferred partial degradation intermediates for toluene [Cozzarelli et al, 1990] both involve hydroxylation of methyl groups, lending additional credibility for related enzymatic activity. The partial degradation rate of pre-NVDOC to NVDOC (r preNVDOC ) ( Table 2) depends on the nonaqueous phase concentration of preNVDOC (C preNVDOC ):…”

Section: 1002/2015wr016964mentioning

confidence: 91%

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

Bekins

Cozzarelli

et al. 2015

Water Resources Research

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131

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Anaerobic biodegradation of organic amendments and contaminants in aquifers can trigger secondary water quality impacts that impair groundwater resources. Reactive transport models help elucidate how diverse geochemical reactions control the spatiotemporal evolution of these impacts. Using extensive monitoring data from a crude oil spill site near Bemidji, Minnesota (USA), we implemented a comprehensive model that simulates secondary plumes of depleted dissolved O 2 and elevated concentrations of Mn 21 , Fe 21 , CH 4 , and Ca 21 over a two-dimensional cross section for 30 years following the spill. The model produces observed changes by representing multiple oil constituents and coupled carbonate and hydroxide chemistry. The model includes reactions with carbonates and Fe and Mn mineral phases, outgassing of CH 4 and CO 2 gas phases, and sorption of Fe, Mn, and H 1 . Model results demonstrate that most of the carbon loss from the oil (70%) occurs through direct outgassing from the oil source zone, greatly limiting the amount of CH 4 cycled down-gradient. The vast majority of reduced Fe is strongly attenuated on sediments, with most (91%) in the sorbed form in the model. Ferrous carbonates constitute a small fraction of the reduced Fe in simulations, but may be important for furthering the reduction of ferric oxides. The combined effect of concomitant redox reactions, sorption, and dissolved CO 2 inputs from source-zone degradation successfully reproduced observed pH. The model demonstrates that secondary water quality impacts may depend strongly on organic carbon properties, and impacts may decrease due to sorption and direct outgassing from the source zone.

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“…Site and description of petroleum-contaminated aquifer Aquifer sediments at the USGS Groundwater Toxics Site in Bemidji, MN have been contaminated with crude oil for over 18 years as a result of a break in an oil pipeline (Hult, 1984;Baedecker et al, 1989;Cozzarelli et al, 1990). Fe(III) reduction is an important terminal electron-accepting process in portions of the aquifer (Lovley et al, 1989;Lovley, 1995;Anderson et al, 1998;Rooney-Varga et al, 1999;Holmes et al, 2005;Nevin et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

Subsurface clade of Geobacteraceae that predominates in a diversity of Fe(III)-reducing subsurface environments

et al. 2007

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There are distinct differences in the physiology of Geobacter species available in pure culture. Therefore, to understand the ecology of Geobacter species in subsurface environments, it is important to know which species predominate. Clone libraries were assembled with 16S rRNA genes and transcripts amplified from three subsurface environments in which Geobacter species are known to be important members of the microbial community: (1) a uranium-contaminated aquifer located in Rifle, CO, USA undergoing in situ bioremediation; (2) an acetate-impacted aquifer that serves as an analog for the long-term acetate amendments proposed for in situ uranium bioremediation and (3) a petroleum-contaminated aquifer in which Geobacter species play a role in the oxidation of aromatic hydrocarbons coupled with the reduction of Fe(III). The majority of Geobacteraceae 16S rRNA sequences found in these environments clustered in a phylogenetically coherent subsurface clade, which also contains a number of Geobacter species isolated from subsurface environments. Concatamers constructed with 43 Geobacter genes amplified from these sites also clustered within this subsurface clade. 16S rRNA transcript and gene sequences in the sediments and groundwater at the Rifle site were highly similar, suggesting that sampling groundwater via monitoring wells can recover the most active Geobacter species. These results suggest that further study of Geobacter species in the subsurface clade is necessary to accurately model the behavior of Geobacter species during subsurface bioremediation of metal and organic contaminants.

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Transformation of Monoaromatic hydrocarbons to organic acids in anoxic groundwater environment

Cited by 163 publications

References 16 publications

Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface

Influence of dissimilatory metal reduction on fate of organic and metal contaminants in the subsurface

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

Subsurface clade of Geobacteraceae that predominates in a diversity of Fe(III)-reducing subsurface environments

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