articles on hydrocarbon bioremediation

articles on hydrocarbon bioremediation

1. LARGE-SCALE BIOAUGMENTATION OF SOILS CONTAMINATED WITH PETROLEUM HYDROCARBONS USING A MIXED MICROBIAL CONSORTIUM

   • Soil contamination eroded
     • method used was bioaugmentation treatment
       • addition of 22 bacterial strains
         • Laboratory experiments Preliminary laboratory experiments were carried out to test the efficacy of the bacterial consortium used in the bioaugmentation of soil sludge
           • Field Experiments Approximately 250 metric tons of materials were excavated from the reserve of aged and degraded TPH contaminated soil and transported to a specially prepared pit with a screen.
             • resultados que se obtuvieron fueron La biorremediación del suelo contaminado en estudios de laboratorio. La adición del consorcio bacteriano resultó en una degradación del 100% del TPH presente en el suelo
               • conclusion This study highlights the importance of an adapted indigenous consortium to improve the degradation of hydrocarbons and confirms bioremediation as an adequate strategy for the treatment of soils contaminated with hydrocarbons on a commercial scale.

2. DECONTAMINATION OF POLYCYCLIC AROMATIC HYDROCARBONS IN PEAS SEEDS BY GAMMA IRRADIATION

   • Soil contamination
     • método que se utiliza es semillas de guisantes
       • seeds were exposed to gamma irradiation at doses of 0, 1, 5, 10 and 15 kGy. PAHs were extracted and their concentrations in each dose were determined by means of a high-performance liquid chromatography equipped with a fluorescent detector.
         • Results show that PAH concentrations decreased as the gamma irradiation dose increased, since the 15 kGy gamma irradiation dose reduced the total PAH in the pea seeds studied by approximately 96%
           • These findings are of great importance and clearly indicate the practical possibility of gamma irradiation in the decontamination of pea seeds from PAH without changing their chemical content.

3. structural dynamics of microbial communities in sediments of tropical estuaries contaminated with polycyclic aromatic hydrocarbons subjected to simulated aerobic biotreatment

   • Environmental pollution by polycyclic aromatic hydrocarbons (PAH
     • Microbial community method
       • Sediment samples were collected from the laguana de lagos
         • Results. Biodegradation of all PAHs except benzo (a) anthracene was detected in all sediments in 2 weeks The degradation of benzo (a) anthracene was not apparent until week 5
           • Microbial degradation is a key process that affects the fate of hap in soils and sediments, and can be carried out by aerobic or anaerobic bacteria, however, of these two groups, the range of hap degraded by aerobes is much higher than that of the anaerobic.

4. application of the landfarming technique for the remediation of soils contaminated with hydrocarbons

   • damage to water sources, soils, air, fauna and vegetation
     • Bioremediation .
       • This technique consists of excavating the contaminated soils, spreading them over a sufficiently wide area and stimulating the variables of incidence in the process to promote the activity of the microorganisms in charge of degrading the hydrocarbons
         • Research shows the existence in nature of microbial agents capable of
           • The biological treatment of contaminated soils involves the use of microorganisms and / or plants for the degradation of organic pollutants. Biological activity alters the molecular structure of the pollutant and the degree of alteration determines whether biotransformation or mineralization has occurred
             • The most important chemical factor in Bioremediation is the molecular structure of the pollutant, how it affects its chemical and physical properties and its ability to be biodegraded.

5. BIODEGRADATION OF POLYCYCLIC AROMATIC HYDROCARBONS BY MICROBIAN CONSORTIUM: A DISTINCTIVE APPROACH TO SOIL DECONTAMINATION

   • Soil contamination
     • method of microbial degradation by bacteria and fungi
       • consortium was conducted using microbial isolates collected from different contaminated sites. the species was isolated from the consortium of three soils contaminated with heavy crude
         • The use of microbial consortia is effective in cases where there is a lack of sufficient microorganisms for degradation or there is a high toxicity of contaminants
           • results it has been found that a consortium of microbes is more effective than individual microbial isolates microbial degradation process is quite economical and does not cause ecological damage
             • Conclusion of the article obrva that applying several microorganisms in combination is a universally efficient system to achieve synergistic improved rates for the degradation of PAH. PAH-contaminated soils can be remedied using microorganisms (bacteria and fungi individually or in combination

6. BIOLOGICAL TREATMENT OF TOTAL PETROLEUM HYDROCARBONS FROM AN OILY SLUDGE USING A COMPOSTING APPROACH

   • pollution of selo and water resources
     • co-composting method
       • For this, the samples were taken from the treatments on certain days (0, 7, 15, 30 and 60) with the sterilized spatula. About 50 g of samples were taken for each experiment and stored in non-reactive plastic bags for TPH and C / N analysis.
         • Results showed that most of the TPH of the samples were extracted in the first 30 days. The maximum removal of TPHs (65%) was obtained in the mud
           • the proportions of compost and the control sample (p value <0.05) indicated the adequate density of TPH degrading bacteria in the treated samples

7. selected for hydrocarbon degrading bacteria and enhanced hydrocarbon biodegradation in slurry bioreactors

   • contamination of surface and groundwater resources
     • microbiome-based biotechnologies to treat hydrocarbon contamination and enhanced biodegradation of hydrocarbons in slurries
       • A sample of hydrocarbon-contaminated weathered soils was obtained from a production site in the Northwest Territories, Canada. Mineralization experiments are performed first Followed by an analysis of the microbial community Gene expression, qPCR and digital droplet PCR (ddPCR)
         • Result The analysis of the microbial community indicated a significant enrichment of the phylum of Actinobacteria and an increase in the absolute abundance of the genus Dietzia that degrades hydrocarbons, but a decrease in the total size of the population with salinity.
           • Research findings. A degradation (up to 16 times greater) was presented in a microbial community under saline conditions and was associated with (up to 4.8 times) an increase in the absolute abundance of a species that degrades hydrocarbons and up to 2.2 times the improvement in the mineralization rate constants. At the same time, the population size decreased by up to 5.2 times in the saline systems.

8. advanced treatment of wastewater bioreactors containing hydrocarbons

   • organic pollution of the environment
     • Aerobic bioreactors
       • Samples and tests applied. A continuously stirred tank bioreactor was applied to treat hydrocarbon-rich wastewater from an oil refinery using an acclimatized indigenous microbial consortium.The performance of the bioaugmented reactor was demonstrated by reducing the chemical oxygen demand (COD) rates to a 95% and the concentration of total residual petroleum hydrocarbons (TPH) up to 97.5% (from 320 mg / L to 8 mg / L) Evaluated the performance of a batch sequencing reactor (SBR) with previously cultured activated sludge microorganisms to treat synthetic petrochemical wastewater containing mercury and cadmium.

9. degradación microbiana de hidrocarburos de petróleo

   • contamination of soils and bodies of Water
     • Methodology used. We worked with tank bottoms from the oil industry that have been previously treated with water washing at 70 ° C with biodegradable surfactant, which reduced the hydrocarbon content
       • The initial characteristics of the tank bottom make it a material for the use of biological techniques in the elimination of hydrocarbons.
         • The residue from the tank bottom washing contained bacteria in sufficient quantity for the use of the hydrocarbon biodegradation techniques of the sample, this presented a predominance of the genera Pseudomonas sp. and Rhodococcus sp

10. Microbial degradation of petrochemical residues-polycyclic aromatic hydrocarbons

    • The problem of pollution is linked to economic, social and political factors; that have led to a deterioration of natural resources
      • Bioremediation is a technology that uses the metabolic potential of microorganisms (mainly bacteria, but also fungi and yeasts) to transform organic pollutants into simpler compounds
        • Among the techniques used for the remediation of soils contaminated with PAH there are physical, chemical, thermal and biological processes
          • The bioremediation of soils or areas of water contaminated with crude oil, depend on the ability to establish and maintain the appropriate conditions in the microorganisms and thus favor the process, otherwise the efficiency decreases
            • Bioremediation is a practice that is gaining importance worldwide since the increase in industrial activity is increasingly degrading natural ecosystems and the use of known microorganisms for the treatment of potentially toxic waste is already a common practice in developed countries. .