Intrinsic biodegradation of MTBE and BTEX in a gasoline‐contaminated aquifer

Borden, Robert C.; Daniel, Robert A.; LeBrun, Louis E.; Davis, Charles W.

doi:10.1029/97wr00014

Cited by 198 publications

(108 citation statements)

References 18 publications

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“…Benzene was chosen as a model compound since it is the most toxic of the BTEX compounds and is often the slowest to degrade at field sites (2,25). A method to determine compound-specific hydrogen isotope ratios in BTEX was developed and tested using benzenes from different manufacturers.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen and Carbon Isotope Fractionation during Aerobic Biodegradation of Benzene

Hunkeler

Andersen

Aravena

et al. 2001

Environ. Sci. Technol.

163

112

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The main aim of the study was to evaluate hydrogen and carbon isotope fractionation during biodegradation of benzene as a possible tool to trace the process in contaminated environments. Aerobic biodegradation of benzene by two bacterial isolates, Acinetobacter sp. and Burkholderia sp., was accompanied by significant hydrogen and carbon isotope fractionation with hydrogen isotope enrichment factors of -12.8 ( 0.7‰ and -11.2 ( 1.8‰, respectively, and average carbon isotope enrichment factors of -1.46 ( 0.06‰ and -3.53 ( 0.26‰, respectively. Inorganic carbon produced by Acinetobacter sp. was depleted in 13 C by 3.6-6.2‰ as compared to the initial δ 13 C of benzene, while the produced biomass was enriched in 13 C by 3.8‰. The secondary aim was to determine isotope ratios of benzenes from different manufacturers with regard to the use of isotopes for source differentiation. While two of the four analyzed benzenes had similar δ 13 C values, each of them had a distinct δ 2 H-δ 13 C pair and δ 2 H values spread over a range of 66.5‰. Thus, combined analyses of hydrogen and carbon isotopes may be a more promising approach to trace sources and/or biodegradation of benzene than measuring carbon isotopes only.

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Section: Introductionmentioning

confidence: 99%

Hydrogen and Carbon Isotope Fractionation during Aerobic Biodegradation of Benzene

Hunkeler

Andersen

Aravena

et al. 2001

Environ. Sci. Technol.

163

112

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“…After the initial transformation, the carbon of the methoxy methyl group and the carbon of the tert-butyl group may be further oxidized to CO2 (10). While biodegradation of MTBE has often been observed in laboratory experiments, there is less evidence for biodegradation of MTBE at field sites (19)(20)(21)(22), possibly due to the lack of adequate tools to monitor biodegradation. Since MTBE frequently migrates over long distances and degradation rates may be low, it is difficult to assess biodegradation based on concentrations or using a mass balance approach.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Biodegradation of Methyl tert-Butyl Ether (MTBE) Using Compound-Specific Carbon Isotope Analysis

Hunkeler

Butler

Aravena

et al. 2001

Environ. Sci. Technol.

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Methyl tert-butyl ether (MTBE), the most common gasoline oxygenate, is frequently detected in surface water and groundwater. The aim of this study was to evaluate the potential of compound-specific isotope analysis to assess in situ biodegradation of MTBE in groundwater. For that purpose, the effect of relevant physical and biological processes on carbon isotope ratios of MTBE was evaluated in laboratory studies. Carbon isotope fractionation during organic phase/gas-phase partitioning (0.50 ( 0.15‰), aqueous phase/gas-phase partitioning (0.17 ( 0.05‰), and organic phase/aqueous-phase partitioning (0.18 ( 0.24‰) was small in comparison to carbon isotope fractionation measured during biodegradation of MTBE in microcosms based on aquifer sediments of the Borden site. In experiments with MTBE as the only substrate and a cometabolic experiment with 3-methypentane as primary substrate, MTBE became enriched in 13 C by 5.1 to 6.9‰ after 95 to 97% degradation. For both experiments, similar isotopic enrichment factors were obtained (-1.52 ( 0.06 to -1.97 ( 0.05‰). Biodegradation of TBA, which accumulated transiently in the cometabolic microcosms, was also accompanied by carbon isotope fractionation, with an isotopic enrichment factor of -4.21 ( 0.07‰. This study suggests that carbon isotope analysis is a potential tool to trace in situ biodegradation of MTBE and TBA and thus to better understand the fate of these contaminants in the environment.

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“…Nei corpi idrici le sostanze organiche biodegradabili sono utilizzate dai microrganismi aerobici come fonte di energia; questo processo comporta l'utilizzo dell'ossigeno disciolto (OD) presente nelle acque come accettore di elettroni con conseguente degradazione della sostanza organica (Pardiek et al, 1992;Odencrantz et al, 1996;Borden et al, 1997;Gibson et al, 1998;Wilson et al, 2002).…”

Section: Introduzioneunclassified

Remediation of BTEX contaminated groundwater: best technology assessment between pump&treat and bioremediation by oxygen injection

Baldi¹,

Iacobini²,

Nauta³

et al. 2012

AS-ITJGW

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Abstract:The presence of benzene, toluene, ethylbenzene and xylene (BTEX) Riassunto: La presenza di benzene, toluene, etilbenzene e xilene (BTEX) disciolti nell'acqua di falda e migrati dalla fase libera (LNAPL) in un acquifero freatico di natura alluvionale ha reso necessaria la progettazione delle attività di bonifica ai sensi del D.Lgs 152/06 e s.m.i., da parte del soggetto responsabile. A tal fine sono state condotte una serie di attività sperimentali per la definizione del modello concettuale del sito in esame e per il dimensionamento della tecnologia di bonifica. Questa è stata supportata dalla costruzione di un modello matematico alle differenze finite di flusso e trasporto reattivo nel mezzo saturo, attraverso i codici numerici MODFLOW e RT3D. Le evidenze sperimentali sito specifiche hanno mostrato come i BTEX disciolti in falda siano sottoposti a processi biodegradativi da parte dei batteri naturalmente presenti nell'acquifero, tali da rendere ipotizzabile una significativa stimola- Parole chiave: biorisanamento, BTEX, degradazione aerobica, modellazione numerica, pump&treat. Keywords: bioremediation, BTEX, aerobic degradation, numerical modeling, pump&treat.zione dell'attività batterica indotta dall'iniezione di ossigeno in falda con la conseguente rimozione dei composti aromatici presenti nel mezzo saturo. Le tecnologie di bonifica valutate sono state il pump&treat (nel seguito P&T) con immissione nell'acquifero dell'acqua di falda emunta e trattata ed il barrieramento reattivo attraverso micro diffusione di ossigeno disciolto in falda (nel seguito OD). I risultati delle elaborazioni svolte hanno evidenziato un netto vantaggio nei termini del rapporto costi/efficienza con l'applicazione dell'OD che presenta complessivamente un costo pari a circa il 30% rispetto al P&T con immissione, raggiungendo inoltre la rimozione della contaminazione disciolta in falda con tempi inferiori; inoltre il sistema di biorisanamento risulta applicabile anche come tecnologia per la Messa in Sicurezza di Emergenza (nel seguito MISE). Il sito esaminato si colloca all'interno di un insediamento a carattere industriale ubicato nell'Italia Centrale. RicercaTechnical report

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Intrinsic biodegradation of MTBE and BTEX in a gasoline‐contaminated aquifer

Cited by 198 publications

References 18 publications

Hydrogen and Carbon Isotope Fractionation during Aerobic Biodegradation of Benzene

Hydrogen and Carbon Isotope Fractionation during Aerobic Biodegradation of Benzene

Monitoring Biodegradation of Methyl tert-Butyl Ether (MTBE) Using Compound-Specific Carbon Isotope Analysis

Remediation of BTEX contaminated groundwater: best technology assessment between pump&treat and bioremediation by oxygen injection

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