A review of the occurrence, toxicity,and biodegradation of condensed thiophenes found in petroleum

Kropp, Kevin G.; Fedorak, Phillip M.

doi:10.1139/w98-045

Cited by 146 publications

(55 citation statements)

References 82 publications

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“…A common theme of early reviews focused on the examination of factors, including nutrients, physical state of the oil, oxygen, temperature, salinity, and pressure, influencing petroleum biodegradation rates, with a view to developing environmental applications (29). Metabolic studies were implemented on the aerobic pathways for alkane, cycloalkane, and aromatic and polycyclic aromatic hydrocarbon (PAH) biodegradation (103,104,294,301,479,572,596,656), for transformations of nitrogen and sulfur compounds (55,74,75,299,352,417), and, more recently, the microbial mechanisms of anaerobic hydrocarbon catabolism (203,243,250,581,390,482,664).…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Petroleum Microbiology

Hamme¹,

Singh

Ward

2003

Microbiol Mol Biol Rev

1,201

640

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Recent advances in molecular biology have extended our understanding of the metabolic processes related to microbial transformation of petroleum hydrocarbons. The physiological responses of microorganisms to the presence of hydrocarbons, including cell surface alterations and adaptive mechanisms for uptake and efflux of these substrates, have been characterized. New molecular techniques have enhanced our ability to investigate the dynamics of microbial communities in petroleum-impacted ecosystems. By establishing conditions which maximize rates and extents of microbial growth, hydrocarbon access, and transformation, highly accelerated and bioreactor-based petroleum waste degradation processes have been implemented. Biofilters capable of removing and biodegrading volatile petroleum contaminants in air streams with short substrate-microbe contact times (<60 s) are being used effectively. Microbes are being injected into partially spent petroleum reservoirs to enhance oil recovery. However, these microbial processes have not exhibited consistent and effective performance, primarily because of our inability to control conditions in the subsurface environment. Microbes may be exploited to break stable oilfield emulsions to produce pipeline quality oil. There is interest in replacing physical oil desulfurization processes with biodesulfurization methods through promotion of selective sulfur removal without degradation of associated carbon moieties. However, since microbes require an environment containing some water, a two-phase oil-water system must be established to optimize contact between the microbes and the hydrocarbon, and such an emulsion is not easily created with viscous crude oil. This challenge may be circumvented by application of the technology to more refined gasoline and diesel substrates, where aqueous-hydrocarbon emulsions are more easily generated. Molecular approaches are being used to broaden the substrate specificity and increase the rates and extents of desulfurization. Bacterial processes are being commercialized for removal of H2S and sulfoxides from petrochemical waste streams. Microbes also have potential for use in removal of nitrogen from crude oil leading to reduced nitric oxide emissions provided that technical problems similar to those experienced in biodesulfurization can be solved. Enzymes are being exploited to produce added-value products from petroleum substrates, and bacterial biosensors are being used to analyze petroleum-contaminated environments

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Section: Introductionmentioning

confidence: 99%

Recent Advances in Petroleum Microbiology

Hamme¹,

Singh

Ward

2003

Microbiol Mol Biol Rev

1,201

640

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“…Diesel oil is a complex mixture of normal, branched and cyclic alkanes and aromatic compounds with the properties of low water solubility, high adsorption coefficient and high stability of the aromatic ring (Dean et al, 2002;Kanaly and Harayama, 2002;Kropp and Fedorak, 1998;Van et al, 2003). Therefore, diesel fuel has been considered as priority pollutants which exert bio-hazardous effects on both human and other living organisms in the environment (Kramer and Van 1990;Refaat et al, 2008;Richardson, 1996).…”

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of a novel native Bacillus strain capable of degrading diesel fuel

Kebria

Ahmad

Ganjidoust

et al. 2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:The ability of native bacteria to utilize diesel fuel as the sole carbon and energy source was investigated in this research. Ten bacterial strains were isolated from the oil refinery field in Tehran, Iran. Two biodegradation experiments were performed in low and high (500 and 10000 ppm, respectively) concentration of diesel fuel for 15 days. Only two isolates were able to efficiently degrade the petroleum hydrocarbons in the first test and degraded 86.67 % and, 80.60 % of diesel fuel, respectively. The secondary experiment was performed to investigate the toxicity effect of diesel fuel at high concentration (10000 ppm). Only one strain was capable to degrade 85.20 % of diesel fuel at the same time (15 days). Phenotype and phylogeny analysis of this strain was characterized and identified as dieseldegrading bacteria, based on gram staining, biochemical tests, 16S rRNA gene sequence analysis. These results indicate that this new strain was Bacillus sp. and could be considered as Bacillus Cereus with 98 % 16 S rRNA gene sequence similarity. The results indicate that native strains have great potential for in situ remediation of diesel-contaminated soils in oil refinery sites.

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“…S-, N-and O-heterocyclic aromatic compounds constitute approximately 5-13 % of creosote (Mueller et al, 1989). Some heterocyclic aromatic compounds, such as carbazole (CA), quinoline, benzothiophene-1-oxide (BTO) and benzofuran, are mutagenic, or at least genotoxic (Eastmond et al, 1984;Seymour et al, 1997;Kropp & Fedorak, 1998). Moreover, because of their relatively high water solubility, S-, N-and O-heterocyclic aromatic compounds can amount to 35-40 % of the watersoluble fraction of creosote, and they are therefore of great environmental concern (Licht et al, 1996).…”

Section: Introductionmentioning

confidence: 99%