Dual augmentation for aerobic bioremediation of MTBE and TCE pollution in heavy metal-contaminated soil

Fernandes, Virgínia Cruz; Albergaria, José Tomás; Oliva-Teles, Maria Teresa; Delerue–Matos, Cristina; Marco, Paolo De

doi:10.1007/s10532-008-9228-9

Cited by 28 publications

(18 citation statements)

References 18 publications

(24 reference statements)

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“…Heavy metals and hydrophobic organic compounds exhibit divergent chemical characteristics (Fernandes et al 2009). Heavy metals are relatively mobile in the soil, especially at low soil pH, and are typically ionic in soil solution (Shin et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

et al. 2011

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Surfactants and inorganic ligands are pointed as efficient to simultaneous removal of heavy metals and hydrophobic organic pollutants from soil. However, the biosurfactants are potentially less toxic to soil organisms than other chemical agents. Thus, in this study the efficiency of combinations of iodide (I(-)) ligand and surfactants produced by different bacterial species in the simultaneous removal of cadmium (Cd(2+)) and phenanthrene in a Haplustox soil sample was investigated. Four microbial surfactants and the synthetic surfactant Triton X-100 were tested with different concentrations of ligand. Soil samples contaminated with Cd(2+) and phenanthrene underwent consecutive washings with a surfactant/ligand solution. The removal of Cd(2+) increased with increased ligand concentration, particularly in solutions containing biosurfactants produced by the bacterial strains Bacillus subtilis LBBMA155 (lipopeptide) and Flavobacterium sp. LBBMA168 (mixture of flavolipids) and Triton X-100. Maximum Cd(2+) removal efficiency was 99.2% for biosurfactant produced by Arthrobacter oxydans LBBMA 201 (lipopeptide) and 99.2% for biosurfactant produced by Bacillus sp. LBBMA111A (mixed lipopeptide) in the presence of 0.336 mol iodide l(-1), while the maximum efficiency of Triton X-100 removal was 65.0%. The biosurfactant solutions removed from 80 to 88.0% of phenanthrene in soil, and the removal was not influenced by the presence of the ligand. Triton X-100 removed from 73 to 88% of the phenanthrene and, differently from the biosurfactants, iodide influenced the removal efficiency. The results indicate that the use of a single washing agent, called surfactant-ligand, affords simultaneous removal of organic contaminants and heavy metals.

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Section: Introductionmentioning

confidence: 99%

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

et al. 2011

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“…Several studies have explored the possibility of obtaining metal‐resistant organic‐degrading micro‐organisms. In view of the fact that such microbes are difficult to recover by enrichment techniques (Fernandes et al. 2008), dual bioaugmentation (co‐inoculation of a metal‐resistant microbial population with an organic‐degrading population) (Roane et al.…”

Section: Introductionmentioning

confidence: 99%

Application of the knowledge-based approach to strain selection for a bioaugmentation process of phenanthrene- and Cr(VI)-contaminated soil

Ibarrolaza

Coppotelli²,

Panno³

et al. 2011

Journal of Applied Microbiology

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Aims: The objective of this study was to apply the knowledge‐based approach to the selection of an inoculum to be used in bioaugmentation processes to facilitate phenanthrene degradation in phenanthrene‐ and Cr(VI)‐co‐contaminated soils. Methods and Results: The bacterial community composition of phenanthrene and phenanthrene‐ and Cr(VI)‐co‐contaminated microcosms, determined by denaturing gradient gel electrophoresis analysis, showed that members of the Sphingomonadaceae family were the predominant micro‐organisms. However, the Cr(VI) contamination produced a selective change of predominant Sphingomonas species, and in co‐contaminated soil microcosms, a population closely related to Sphingomonas paucimobilis was naturally selected. The bioaugmentation process was carried out using the phenanthrene‐degrading strain S. paucimobilis 20006FA, isolated and characterized in our laboratory. Although the strain showed a low Cr(VI) resistance (0·250 mmol l−1); in liquid culture, it was capable of reducing chromate and degrading phenanthrene simultaneously. Conclusion: The inoculation of this strain managed to moderate the effect of the presence of Cr(VI), increasing the biological activity and phenanthrene degradation rate in co‐contaminated microcosm. Significance and Impact of the Study: In this study, we have applied a novel approach to the selection of the adequate inoculum to enhance the phenanthrene degradation in phenanthrene‐ and Cr(VI)‐co‐contaminated soils.

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“…It was established that sequestration by heavy metal-degrading microorganisms reduced the bioavailable metal concentration and promoted even higher 2,4-D biodegradation rates. This technique was also demonstrated by Fernandes et al (2009) were coupled with strains that showed good performance at degrading the pollutants methyl tertiary butyl ether or trichloroethane. Another strategy that has the potential to tackle the co-contamination predicament involves the utilization of a microorganism that can withstand and thrive in sites contaminated with heavy metals and still be able to exhibit unimpaired biodegradation.…”

Section: Bioaugmentationmentioning

confidence: 97%

Co-contamination of water with chlorinated hydrocarbons and heavy metals: challenges and current bioremediation strategies

Arjoon

Olaniran

Pillay

2012

Int. J. Environ. Sci. Technol.

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Chlorinated hydrocarbons can cause serious environmental and human health problems as a result of their bioaccumulation, persistence and toxicity. Improper disposal practices or accidental spills of these compounds have made them common contaminants of soil and groundwater. Bioremediation is a promising technology for remediation of sites contaminated with chlorinated hydrocarbons. However, sites co-contaminated with heavy metal pollutants can be a problem since heavy metals can adversely affect potentially important biodegradation processes of the microorganisms. These effects include extended acclimation periods, reduced biodegradation rates, and failure of target compound biodegradation. Remediation of sites co-contaminated with chlorinated organic compounds and toxic metals is challenging, as the two components often must be treated differently. Recent approaches to increasing biodegradation of organic compounds in the presence of heavy metals include the use of dual bioaugmentation; involving the utilization of heavy metal-resistant bacteria in conjunction with an organicdegrading bacterium. The use of zero-valent irons as a novel reductant, cyclodextrin as a complexing agent, renewable agricultural biosorbents as adsorbents, biosurfactants that act as chelators of the co-contaminants and phytoremediation approaches that utilize plants for the remediation of organic and inorganic compounds have also been reported. This review provides an overview of the problems associated with co-contamination of sites with chlorinated organics and heavy metals, the current strategies being employed to remediate such sites and the challenges involved.

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Dual augmentation for aerobic bioremediation of MTBE and TCE pollution in heavy metal-contaminated soil

Cited by 28 publications

References 18 publications

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

Simultaneous phenanthrene and cadmium removal from contaminated soil by a ligand/biosurfactant solution

Application of the knowledge-based approach to strain selection for a bioaugmentation process of phenanthrene- and Cr(VI)-contaminated soil

Co-contamination of water with chlorinated hydrocarbons and heavy metals: challenges and current bioremediation strategies

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