Full‐scale in‐situ biobarrier demonstration for containment and treatment of MTBE

Miller, Karen D.; Johnson, Paul C.; Bruce, Cristin L.

doi:10.1002/rem.1023

Cited by 10 publications

(5 citation statements)

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“…In this work, the attention is focused on a particular type of barriers based on the promotion of the biological degradation technology [28][29][30][31][32][33][34]. These are named Biological Permeable Reactive Barriers or Biobarriers (BB).…”

Section: Introductionmentioning

confidence: 99%

Influence of electric field on the remediation of polluted soil using a biobarrier assisted electro-bioremediation process

Mena

Villaseñor

Cañizares

et al. 2016

Electrochimica Acta

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In this work, it was carried out the study of the electro-bioremediation of soil polluted with diesel by means of combined electrokinetic soil flushing and biobarriers, using bench scale setups and fourteen days-long tests. Two different biobarriers were evaluated: one of them was developed in the laboratory, with a culture of diesel-degrading microorganisms supported on gravel particles (BB1); the other was obtained by mixing directly clay soil with activated sludge obtained in a municipal wastewater treatment plant (BB2). Biobarriers were placed in a central point of the soil section to be treated, to prevent the negative consequences of pH fronts on microorganisms viability. Potential difference of 0.5 and 1.0 V cm-1 were applied. For the promotion in the transport of the diesel to the biobarrier, a surfactant solution was used as electrolyte (flushing fluid). Results confirm that negative influence of the extreme pH fronts on the microbial viability can be prevented using this electro-bioremediation approach. In the same way, uniform diesel removal was obtained all over the soil by using the surfactant solution. After fourteen days of treatment, in the experiments using the BB1, 19.36% and 27.36% of the total amount of diesel present in the soil were removed applying 0.5 and 1.0 V cm-1 , respectively. In the experiments using BB2, 23.33% and 29.10% referred to the total amount of diesel were removed after the fourteen days tests at 0.5 and 1.0 V cm-1 , respectively, indicating that the non-specific barrier is slightly more efficient despite not containing an acclimated culture.

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Section: Introductionmentioning

confidence: 99%

Influence of electric field on the remediation of polluted soil using a biobarrier assisted electro-bioremediation process

Mena

Villaseñor

Cañizares

et al. 2016

Electrochimica Acta

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“…Numerous publications are available regarding the use of PRBs [8][9][10][11][12][13] or biobarriers [14][15][16][17][18][19][20] for the removal of heavy metals or organic compounds from polluted soils.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

et al. 2014

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This paper studies the possibility of providing oxygen to a soil by an electrokinetic technique, so that the method could be used in future aerobic polluted soil bioremediation treatments. The oxygen was generated from the anodic reaction of water electrolysis and transported to the soil in a laboratory-scale electrokinetic cell. Two variables were tested: the soil texture and the voltage gradient. The technique was tested in two artificial soils (clay and sand) and later in a real silty soil, and three voltage gradients were used: 0.0 (control), 0.5, and 1.0 V cm(-1). It was observed that these two variables strongly influenced the results. Oxygen transport into the soil was only available in the silty and sandy soils by oxygen diffusion, obtaining high dissolved oxygen concentrations, between 4 and 9 mg L(-1), useful for possible aerobic biodegradation processes, while transport was not possible in fine-grained soils such as clay. Electro-osmotic flow did not contribute to the transport of oxygen, and an increase in voltage gradients produced higher oxygen transfer rates. However, only a minimum fraction of the electrolytically generated oxygen was efficiently used, and the maximum oxygen transport rate observed, approximately 1.4 mgO2 L(-1)d(-1), was rather low, so this technique could be only tested in slow in-situ biostimulation processes for organics removal from polluted soils.

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“…Demethylation of MTBE by acetogenic organisms may play an important role in MTBE biodegradation under some anaerobic conditions (Youngster et al 2008). Aerobic biodegradation has also been shown to be an effective treatment option for both MTBE and TBA (Fortin et al 2001;Kharoune et al 2001;Miller et al 2001;Pruden et al 2001Pruden et al , 2003Wilson et al 2001Wilson et al , 2002. At the organism level, two physiologically distinct aerobic biodegradation processes for these compounds have been described.…”

Section: Introductionmentioning

confidence: 99%

Effects of gasoline components on MTBE and TBA cometabolism by Mycobacterium austroafricanum JOB5

House

Hyman

2009

Biodegradation

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In this study we have examined the effects of individual gasoline hydrocarbons (C(5-10,12,14) n-alkanes, C(5-8) isoalkanes, alicyclics [cyclopentane and methylcyclopentane] and BTEX compounds [benzene, toluene, ethylbenzene, m-, o-, and p-xylene]) on cometabolism of methyl tertiary butyl ether (MTBE) and tertiary butyl alcohol (TBA) by Mycobacterium austroafricanum JOB5. All of the alkanes tested supported growth and both MTBE and TBA oxidation. Growth on C(5-8) n-alkanes and isoalkanes was inhibited by acetylene whereas growth on longer chain n-alkanes was largely unaffected by this gas. However, oxidation of both MTBE and TBA by resting cells was consistently inhibited by acetylene, irrespective of the alkane used as growth-supporting substrate. A model involving two separate but co-expressed alkane-oxidizing enzyme systems is proposed to account for these observations. Cyclopentane, methylcyclopentane, benzene and ethylbenzene did not support growth but these compounds all inhibited MTBE and TBA oxidation by alkane-grown cells. In the case of benzene, the inhibition was shown to be due to competitive interactions with both MTBE and TBA. Several aromatic compounds (p-xylene > toluene > m-xylene) did support growth and cells previously grown on these substrates also oxidized MTBE and TBA. Low concentrations of toluene (<10 microM) stimulated MTBE and TBA oxidation by alkane-grown cells whereas higher concentrations were inhibitory. The effects of acetylene suggest strain JOB5 also has two distinct toluene-oxidizing activities. These results have been discussed in terms of their impact on our understanding of MTBE and TBA cometabolism and the enzymes involved in these processes in mycobacteria and other bacteria.

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Full‐scale in‐situ biobarrier demonstration for containment and treatment of MTBE

Cited by 10 publications

References 1 publication

Influence of electric field on the remediation of polluted soil using a biobarrier assisted electro-bioremediation process

Influence of electric field on the remediation of polluted soil using a biobarrier assisted electro-bioremediation process

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

Effects of gasoline components on MTBE and TBA cometabolism by Mycobacterium austroafricanum JOB5

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