Effect of Mixtures of Polycyclic Aromatic Hydrocarbons and Sediments on Fluoranthene Biodegradation Patterns

Beckles, Denise M.; Ward, C. Herb; Hughes, Joseph B.

doi:10.1897/1551-5028(1998)017<1246:eomopa>2.3.co;2

Cited by 12 publications

(18 citation statements)

References 29 publications

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“…Furthermore, in the switching anoxic/oxic condition, chrysenes and fluoranthenes showed a similar removal after only 3 days of aeration (following 10 days of anoxia) than in the oxic condition after 13 days. These hydrocarbons are known to be relatively recalcitrant to natural degradation processes, but their degradation has been reported both in anoxic (Foght 2008) and oxic conditions (Peng et al 2008), sometimes in co-metabolism (Beckles et al 1998;Baboshin et al 2008). In our study, the anoxic period appears to have an influence on the degradation of these molecules, probably by stimulating anaerobic metabolisms, thus preparing the conditions for a better degradation by aerobic metabolisms after the oxygen supply.…”

Section: Removal Of Pahmentioning

confidence: 99%

Effect of oxic/anoxic switches on bacterial communities and PAH biodegradation in an oil-contaminated sludge

Vitte

Duran

Jézéquel

et al. 2011

Environ Sci Pollut Res

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The autochthonous bacterial communities of an oil sludge showed a strong potential to adapt and degrade PAH when they were subjected to alternating anoxic/oxic conditions, as well as under an oxic condition. In addition, changes in the bacterial communities were related to the different phases of hydrocarbon degradation, and the removal efficiency of PAH was similar in both switching and permanent oxic conditions. This methodology could be useful for an alternative solution of oil sludge treatment with a low-cost processing, as its efficiency is similar to that of a permanent oxic incubation which is more expensive in oxygen supply.

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Section: Removal Of Pahmentioning

confidence: 99%

Effect of oxic/anoxic switches on bacterial communities and PAH biodegradation in an oil-contaminated sludge

Vitte

Duran

Jézéquel

et al. 2011

Environ Sci Pollut Res

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“…Interactions between PAHs are possible which can alter the rate and extent of biodegradation within a mixture (Beckles et al 1998;Guha et al 1999;Kelley and Cerniglia 1995;Knightes 2000). Rarely can biodegradation patterns of single PAHs be extended to degradation patterns of their mixtures (Beckles et al 1998). Yet most of the studies have focused either on individual PAH biodegradation or reported substrate interactions in PAH mixtures on a qualitative basis without integrating kinetic modeling.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation kinetics of select polycyclic aromatic hydrocarbon (PAH) mixtures by Sphingomonas paucimobilis EPA505

et al. 2007

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Many contaminated sites commonly have complex mixtures of polycyclic aromatic hydrocarbons (PAHs) whose individual microbial biodegradation may be altered in mixtures. Biodegradation kinetics for fluorene, naphthalene, 1,5-dimethylnaphthalene and 1-methylfluorene were evaluated in sole substrate, binary and ternary systems using Sphingomonas paucimobilis EPA505. The first order rate constants for fluorene, naphthalene, 1,5-dimethylnaphthalene, and 1-methylfluorene were comparable; yet Monod parameters were significantly different for the tested PAHs. S. paucimobilis completely degraded all the components in binary and ternary mixtures; however, the initial degradation rates of individual components decreased in the presence of competitive PAHs. Results from the mixture experiments indicate competitive interactions, demonstrated mathematically. The generated model appropriately predicted the biodegradation kinetics in mixtures using parameter estimates from the sole substrate experiments, validating the hypothesis of a common rate-determining step. Biodegradation kinetics in mixtures were affected by the affinity coefficients of the co-occurring PAHs and mixture composition. Experiments with equal concentrations of substrates demonstrated the effect of concentration on competitive inhibition. Ternary experiments with naphthalene, 1,5-dimethylnaphthalene and 1-methylfluorene revealed delayed degradation, where depletion of naphthalene and 1,5-dimethylnapthalene occurred rapidly only after the complete removal of 1-methylfluorene. The substrate interactions observed in mixtures require a multisubstrate model to account for simultaneous degradation of substrates. PAH contaminated sites are far more complex than even ternary mixtures; however these studies clearly demonstrate the effect that interactions can have on individual chemical kinetics. Consequently, predicting natural or enhanced degradation of PAHs cannot be based on single compound kinetics as this assumption would likely overestimate the rate of disappearance.

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“…Previous studies have found evidence of enhanced biodegradation rates as well as decreased biodegradation rates for PAHs present in mixtures [3][4][5][6][7][8][9][10][11][12][13][14][15]. These studies provided valuable insights regarding the significance for potential substrate interactions in the biodegradation of mixtures of PAHs, but when examined collectively, no clear pattern to the substrate interactions was found.…”

Section: Introductionmentioning

confidence: 99%

Multisubstrate biodegradation kinetics for binary and complex mixtures of polycyclic aromatic hydrocarbons

Knightes

Peters

2006

Environmental Toxicology and Chemistry

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Biodegradation kinetics were studied for binary and complex mixtures of nine polycyclic aromatic hydrocarbons (PAHs): Naphthalene, 1-methylnaphthalene, 2-methylnaphthalene, 2-ethylnaphthalene, phenanthrene, anthracene, pyrene, fluorene, and fluoranthene. Discrepancies between the observed biodegradation rates and those predicted by a sole-substrate model indicate that significant substrate interactions occurred in both the binary and complex-mixture experiments. For all compounds except naphthalene, biodegradation was enhanced. The observations were compared to predictions from two multisubstrate biodegradation kinetic models: One that accounts for competitive inhibition, and one that does not. Both models are fully predictive in that parameters had been determined from an independent set of sole-substrate experiments. In the binary experiments, the major multisubstrate effect was biomass enhancement as a result of growth on naphthalene. Substrate interactions were orders of magnitude larger for most compounds in the complex mixtures, but significant competitive inhibition effects counteracted some of the biomass enhancement effect. The present study has demonstrated that the sole-substrate model is inadequate to describe multisubstrate biodegradation kinetics for a broad range of PAH mixtures. Whereas the multisubstrate model without inhibition did an adequate job of predicting the observed effects in some cases, we advocate the use of the multisubstrate model with inhibition for similar modeling efforts in light of the evidence that the model was correct more often than not. Theory supports its use because of the common enzyme pathways for biodegradation of PAHs.

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Effect of Mixtures of Polycyclic Aromatic Hydrocarbons and Sediments on Fluoranthene Biodegradation Patterns

Cited by 12 publications

References 29 publications

Effect of oxic/anoxic switches on bacterial communities and PAH biodegradation in an oil-contaminated sludge

Effect of oxic/anoxic switches on bacterial communities and PAH biodegradation in an oil-contaminated sludge

Biodegradation kinetics of select polycyclic aromatic hydrocarbon (PAH) mixtures by Sphingomonas paucimobilis EPA505

Multisubstrate biodegradation kinetics for binary and complex mixtures of polycyclic aromatic hydrocarbons

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