Contaminated environments in the subsurface and bioremediation: organic contaminants

Holliger, Christof

doi:10.1016/s0168-6445(97)00030-2

Cited by 26 publications

(23 citation statements)

References 52 publications

(59 reference statements)

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“…In relation to the dissolved oxygen (DO) content, O 2 consumption was detected only in the experiment with B. thuringiensis, which is the strain with the highest growth rate. Oxygen concentration is a limiting factor for aerobic bacteria growth and for the decomposition of petroleum hydrocarbons by enzymatic cleavage (oxygenases) of their aromatic rings 11,35 , whose products are used in energy generation pathways 11,36 . Deng et al 37 , when investigating the potential of petroleum hydrocarbons degradation by Achromobacter sp, observed that the highest degradation rate occurred during reactor media agitation, thus allowing sufficient oxygen transfer and maintaining the optimum DO levels for biodegradation.…”

Section: Morphological and Molecular Characterization Of Isolated Bacmentioning

confidence: 99%

Petroleum-Tolerant Rhizospheric Bacteria: Isolation, Characterization and Bioremediation Potential

Viesser

Sugai-Guérios

Malucelli

et al. 2020

Sci Rep

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petroleum is an important energy source. Due to its intensive exploration, accidents resulting in oil spills on soil are frequent, which creates consequences to ecosystems and human health. Rhizodegradation is an efficient technique that promotes the decontamination of polluted environments through the selection and use of rhizosphere microorganisms from phytoremediation plants. the aim of this study was to isolate, identify and characterize bacteria capable of degrading petroleum from the rhizosphere of Panicum aquaticum poir., a plant that grows in petroleum contaminated soils. three bacteria were isolated and characterized at the morphological (Gram staining), molecular (16S rRNA gene sequence analysis) and biochemical level. These bacteria were identified as new strains of Bacillus thurigiensis, Bacillus pumilus and Rhodococcus hoagii, which have been reported as potential bioremediators in the literature. All three bacteria were able to use petroleum hydrocarbons as the sole carbon source during in vitro degradation assays. Gas chromatography analysis of these assays indicated reductions of petroleum hydrocarbons between 23% and 96% within 48 h. Among the isolated bacteria, Rhodococcus hoagii presented the highest efficiency of petroleum consumption, reaching 87% of degradation after only 24 h of cultivation, which corresponds to a higher and faster degradation than previously reported, confirming the potential use of Rhodococcus hoagii for petroleum biodegradation. Petroleum has a complex composition formed predominantly by aliphatic and aromatic hydrocarbons, and lower concentrations of asphaltenes, resins and metals. In turn, petroleum composition varies according to the geographical localization and physical, chemical and biological conditions of the environment where it is formed 1. Many compounds present in petroleum are toxic, mutagenic or carcinogenic 2. The effects of naphthalene in humans, for example, include skin irritation, red blood cells breakdown and nephrotoxicity 2,3. Petroleum spills into the environment result from the high volume of petroleum used as raw material for energy and chemicals production as well as the accidents during operating processes, transportation, refining, storage and consumption 4,5. In contact with the environment, petroleum undergoes changes in its original characteristics, due to the interaction between physical and biological factors 6,7. The persistence of petroleum hydrocarbons in the environment is a result of their slow biodegradation and can compromise quality of water resources and the soil and may be accumulated in food, such as vegetables, muscles and fish 2,8. Environment-friendly approaches have been proposed to remediate petroleum-contaminated environments. According to Pandey et al. 9 and Paul et al. 10 , bioremediation is widely used in environmental decontamination due to its relatively lower costs and higher efficiency when compared to chemical and physical remediation techniques. Bioremediation is based on the metabolization of pollutants through ...

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Section: Morphological and Molecular Characterization Of Isolated Bacmentioning

confidence: 99%

Petroleum-Tolerant Rhizospheric Bacteria: Isolation, Characterization and Bioremediation Potential

Viesser

Sugai-Guérios

Malucelli

et al. 2020

Sci Rep

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“…The amount of natural crude oil seepage was estimated to be 600,000 metric tons per year with a range of uncertainty of 200,000 metric tons per year [1]. Release of hydrocarbons into the environment whether accidentally or due to human activities is a main cause of water and soil pollution [2]. Soil contamination with hydrocarbons causes extensive damage of local system since accumulation of pollutants in animals and plant tissue may cause death or mutations [3].…”

Section: Introductionmentioning

confidence: 99%

Microbial Degradation of Petroleum Hydrocarbon Contaminants: An Overview

Das

Chandran

2011

Biotechnology Research International

1,286

857

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One of the major environmental problems today is hydrocarbon contamination resulting from the activities related to the petrochemical industry. Accidental releases of petroleum products are of particular concern in the environment. Hydrocarbon components have been known to belong to the family of carcinogens and neurotoxic organic pollutants. Currently accepted disposal methods of incineration or burial insecure landfills can become prohibitively expensive when amounts of contaminants are large. Mechanical and chemical methods generally used to remove hydrocarbons from contaminated sites have limited effectiveness and can be expensive. Bioremediation is the promising technology for the treatment of these contaminated sites since it is cost-effective and will lead to complete mineralization. Bioremediation functions basically on biodegradation, which may refer to complete mineralization of organic contaminants into carbon dioxide, water, inorganic compounds, and cell protein or transformation of complex organic contaminants to other simpler organic compounds by biological agents like microorganisms. Many indigenous microorganisms in water and soil are capable of degrading hydrocarbon contaminants. This paper presents an updated overview of petroleum hydrocarbon degradation by microorganisms under different ecosystems.

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“…The refining processes of crude oil into petroleum products are the main sources of man-induced hydrocarbons. Release of hydrocarbons into the environment whether accidentally or due to human activities is a main cause of water pollution [26].…”

Section: Resultsmentioning

confidence: 99%

Diesel Oil Degradation Potential of a Bacterium Inhabiting Petroleum Hydrocarbon Contaminated Surface Waters and Characterization of Its Emulsification Ability

Onur

Yılmaz

İçgen

2015

J Surfact & Detergents

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Degradation of poorly water soluble hydrocarbons, like n‐alkanes and polycyclic aromatic hydrocarbons are challenged by some bacteria through emulsification of hydrocarbons by producing biosurfactants. In diesel oil bioremediation, diesel oil degrading and surfactant producing bacteria are used to eliminate these pollutants from contaminated waters. Therefore, identifying and characterizing bacteria capable of producing surfactant and degrading diesel oil are pivotal. In this study, bacteria isolated from hydrocarbon contaminated river water were screened for their potential to degrade diesel oil. Primary selection was carried out by using conventional enrichment culture technique, emulsification index measurement, gravimetric and gas chromatographic analyses of diesel oil degradation. A bacterium with 60 % emulsification index and 92 % diesel oil degradation ability in 14 days was identified as Acinetobacter haemolyticus Zn01 by 16S rRNA sequencing. A. haemolyticus Zn01 was shown to harbor both catabolic genes alkB and C23O effective in diesel oil degradation. The biosurfactant of the bacterium was also characterized in terms of surface tension, zeta potential, Fourier transform infrared spectroscopy and scanning electron microscopy. Being able to emulsify and degrade diesel oil, A. haemolyticus Zn01 seems to have high potential for the elimination of diesel oil from polluted waters.

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Contaminated environments in the subsurface and bioremediation: organic contaminants

Cited by 26 publications

References 52 publications

Petroleum-Tolerant Rhizospheric Bacteria: Isolation, Characterization and Bioremediation Potential

Petroleum-Tolerant Rhizospheric Bacteria: Isolation, Characterization and Bioremediation Potential

Microbial Degradation of Petroleum Hydrocarbon Contaminants: An Overview

Diesel Oil Degradation Potential of a Bacterium Inhabiting Petroleum Hydrocarbon Contaminated Surface Waters and Characterization of Its Emulsification Ability

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