Microbial degradation of phenols and aromatic hydrocarbons in creosote-contaminated groundwater under nitrate-reducing conditions

Flyvbjerg, John; Arvin, Erik; Jensen, Bjørn K.; Olsen, S K

doi:10.1016/0169-7722(93)90018-n

Cited by 75 publications

(32 citation statements)

References 30 publications

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“…As such, they decrease the efflux from factories, foul filters and bioreactors [19], and are present in drag-increasing biocolonies on ships [20]. Biofilms can also be beneficial; for example, in bioremediation, bacteria and their biofilms remove toxins from their surroundings [21,22]. The formation, structure, and mechanics of biofilms supported on solid surfaces are relatively well studied [11,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Films of bacteria at interfaces: three stages of behaviour

et al. 2015

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Bacterial attachment to a fluid interface can lead to the formation of a film with physicochemical properties that evolve with time. We study the time evolution of interface (micro)mechanics for interfaces between oil and bacterial suspensions by following the motion of colloidal probes trapped by capillarity to determine the interface microrheology. Initially, active bacteria at and near the interface drive superdiffusive motion of the colloidal probes. Over timescales of minutes, the bacteria form a viscoelastic film which we discuss as a quasi-two-dimensional, active, glassy system. To study late stage mechanics of the film, we use pendant drop elastometry. The films, grown over tens of hours on oil drops, are expanded and compressed by changing the drop volume. For small strains, by modeling the films as 2D Hookean solids, we estimate the film elastic moduli, finding values similar to those reported in the literature for the bacteria themselves. For large strains, the films are highly hysteretic. Finally, from wrinkles formed on highly compressed drops, we estimate film bending energies. The dramatic restructuring of the interface by such robust films has broad implications, e.g. in the study of active colloids, in understanding the community dynamics of bacteria, and in applied settings including bioremediation.

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Section: Introductionmentioning

confidence: 99%

Films of bacteria at interfaces: three stages of behaviour

et al. 2015

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“…Many studies have been carried out to investigate the degradation of creosote compounds under different redox conditions. Often, studies are concentrated on the degradation of a single compound or simple mixtures of compounds Flyvbjerg et al 1993; Thomas & Lester 1993;Corseuil & Weber 1994), and usually they have focused on the PAHs, MAHs or the phenolic compounds. These studies may give an incorrect estimate of the biodegradation potential in the groundwater, since a contamination often consists of many different compounds.…”

Section: Introductionmentioning

confidence: 99%

Effects of creosote compounds on the aerobic bio-degradation of benzene

1996

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The inhibitory effect of creosote compounds on the aerobic degradation of benzene was studied in microcosm experiments. A total removal of benzene was observed after twelve days of incubation in microcosms where no inhibition was observed. Thiophene and benzothiophene, two heterocyclic aromatic compounds containing sulfur (S-compounds), had a significant inhibitory effect on the degradation of benzene, but also an inhibitory effect of benzofuran (an O-compound) and 1-methylpyrrole (a N-compound) could be observed, although the effect was weaker. The NSO-compounds also had an inhibitory effect on the degradation of p-xylene, o-xylene, and naphthalene, while they only had a weak influence on the degradation of 1-methylnaphthalene, o-cresol and 2,4-dimethylphenol. The phenolic compounds seemed to have a weak stimulating effect on the degradation of benzene whereas the monoaromatic hydrocarbons and the naphthalenes had no significant influence on the benzene degradation. The inhibitory effect of the NSO-compounds on the aerobic degradation of benzene could be identified as three different phenomena. The lag phase increased, the degradation rate decreased, and a residual concentration of benzene was observed in microcosms when NSO-compounds were present. The results show that NSO-compounds can have a potential inhibitory effect on the degradation of many creosote compounds, and that inhibitory effects in mixtures can be important for the degradation of different compounds.

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“…If the oxygen is consumed, anaerobic conditions become dominant and biodegradation effectiveness and rates depend upon the terminal electron accepting process (TEAP). Biodegradation of BTEX and related compounds has been shown to occur under aerobic as well anaerobic conditions utilizing various electron accepting processes, including denitrification, iron reduction, sulfate reduction, and CO 2 reduction (Barker et al 1987;Lovley and Phillips 1988;Major et al 1988;Lovley et al 1989;Davis et al 1994;Flyvberg et al 1993;Lovley and Lonergran 1990;Haag et al 1991;Baedecker et al 1993;Borden et al 1995Borden et al , 1997aChapelle et al 2003). The specific compounds benzene, toluene, ethylbenzene, and the three xylene isomers o-, m-, and p-xylene, vary significantly in their mechanisms and rates of anaerobic biodegradation (Chapelle et al 2003;Johnson et al 2003;Chakraborty and Coates 2004;Schreiber et al 2004;Scow and Hicks 2005;Hu et al 2007;Dou et al 2008).…”

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confidence: 99%

Concentration trends and water-level fluctuations at underground storage tank sites

Kehew

Lynch²

2010

Environ Earth Sci

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Concentration trends of monitor wells utilized in monitored natural attenuation at petroleum underground storage tank sites can be used to predict achievement of regulatory standards if the data approximate a first-order decline trend. However, declining concentration trends often display seasonal and other fluctuations that complicate trend interpretation. Seasonal correlations between concentration and water-level elevation, including in-phase and inverse relationships, constitute one of the most common types of variation. The in-phase fluctuations are most common for monitor wells located in or near the source area of the release. This relationship may be the result of increased contact with the smear zone in the source area during periods of high water table. Conversely, inverse trends of water-level elevation and concentration are most common in downgradient wells beyond the limit of the source area. In a year long study of short-term fluctuations in BTEX and other parameters in a downgradient monitor well, the data suggest that the winter/spring recharge event significantly controls the concentration trends of BTEX as well as inorganic compounds in the well. Recharge and associated water table rise began in late fall and were soon followed by a slug of inorganic ions strongly influenced by road salt application. This slug of recharge diluted the concentrations of petroleum compounds and alkalinity (bicarbonate). Electron acceptors including oxygen, nitrate, and sulfate, which is a component of road salt, are also contributed to the water table during recharge. Oxygen and nitrate were not detected in the monitor well samples and were most likely consumed quickly in biodegradation reactions at the top of the contaminant plume. Sulfate peaked during winter/spring recharge and then slowly declined during the summer and fall, along with redox potential. Alkalinity (bicarbonate) increased during this period, which may represent the coupled oxidation of organic carbon to CO 2 with sulfate as the electron acceptor. BTEX concentrations peaked in the fall probably due to the lack of diluting recharge. The slow changes in concentration over the summer and fall months, interpreted to be caused by biodegradation, contrast with the rapid changes associated with dilution during the recharge event.

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Microbial degradation of phenols and aromatic hydrocarbons in creosote-contaminated groundwater under nitrate-reducing conditions

Cited by 75 publications

References 30 publications

Films of bacteria at interfaces: three stages of behaviour

Films of bacteria at interfaces: three stages of behaviour

Effects of creosote compounds on the aerobic bio-degradation of benzene

Concentration trends and water-level fluctuations at underground storage tank sites

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