In situ vadose zone bioremediation

Höhener, Patrick; Ponsin, Violaine

doi:10.1016/j.copbio.2013.08.018

Cited by 82 publications

(31 citation statements)

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“…The essential hydraulic and chemical conditions for biostimulation of hydrocarbon degradation have been well established (Höhener and Ponsin, 2014). Nevertheless, achieving these conditions in full-scale field setups that include deep sections of the unsaturated zone requires a delicate balance among the factors controlling infiltration, degradation, and transport in the unsaturated zone.…”

Section: Core Ideasmentioning

confidence: 99%

“…However, this method does not provide definitive evidence for the degradation of a specific compound. Furthermore, an increase in CO 2 concentration can be associated with the degradation of natural soil organic matter and not necessarily the target contaminant.The essential hydraulic and chemical conditions for biostimulation of hydrocarbon degradation have been well established (Höhener and Ponsin, 2014). Nevertheless, achieving these conditions in full-scale field setups that include deep sections of the unsaturated zone requires a delicate balance among the factors controlling infiltration, degradation, and transport in the unsaturated zone.…”

mentioning

confidence: 99%

“…While increased water content might result in increased down-leaching of contaminants, low water content may lead to a reduction in the water and nutrient fluxes that are necessary for biodegradation processes. Therefore, direct measurement of water-content variation in the vadose zone is essential for proper management of remediation efficiency.Compound-specific isotope analysis (CSIA) is often used as a tool for biodegradation assessment (Meckenstock et al, 2002(Meckenstock et al, , 2004Hunkeler et al, 2009;Höhener and Ponsin, 2014). Different biodegradation rates for molecules with light and heavy isotopes induce fractionation and isotopic enrichment within the remaining contaminant pool enriched with 13 C isotopes (Bouchard et al, 2008b;Hunkeler et al, 2011).…”

mentioning

confidence: 99%

“…Compound-specific isotope analysis (CSIA) is often used as a tool for biodegradation assessment (Meckenstock et al, 2002(Meckenstock et al, , 2004Hunkeler et al, 2009;Höhener and Ponsin, 2014). Different biodegradation rates for molecules with light and heavy isotopes induce fractionation and isotopic enrichment within the remaining contaminant pool enriched with 13 C isotopes (Bouchard et al, 2008b;Hunkeler et al, 2011).…”

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confidence: 99%

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In Situ Bioremediation of a Gasoline‐Contaminated Vadose Zone: Implications from Direct Observations

Moshkovich

Ronen

Gelman

et al. 2018

Vadose Zone Journal

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In situ bioremediation of a contaminated vadose zone requires implementing hydraulic and chemical conditions that stimulate the development of indigenous bacteria capable of degrading contaminants in the subsurface. We investigated enhanced biostimulation of a gasoline-contaminated deep vadose zone through nutrient-and O 2 -amended water infiltration. A vadose zone monitoring system (VMS) provided real-time observations of the treatment process's effect on hydrocarbon attenuation. The VMS data included continuous measurements of variations in water content, concentrations and isotopic compositions of methyl tert-butyl ether and benzene, toluene, ethylbenzene, and xylene in pore-water and gas phases, and concentrations of O 2 and CO 2 in the vadose zone gas phase. Real-time observations from the unsaturated zone enabled interactive adjustment of the remediation strategy and improved biostimulation conditions for biodegradation of the target compounds. In the course of three infiltration events that included infiltration of an O 2 -and nutrient-enriched water solution, a significant reduction in contaminant mass was observed across the unsaturated zone.Abbreviations: BTEX, benzene, toluene, ethylbenzene, and xylene; CSIA, compound-specific isotope analysis; MTBE, methyl tert-butyl ether; NAPL, nonaqueous-phase liquid; VMS, vadose zone monitoring system; VOC, volatile organic compound.Vadose zone pollution by contaminants originating from gasoline is a widespread problem due to frequently occurring surface spills and leaks from underground gasoline storage tanks. When released into the subsurface, nonaqueous-phase liquids (NAPLs) migrate downward through the unsaturated zone, sometimes reaching the groundwater (Moran et al., 2005). Volatile organic compound (VOC) fractions of the gasoline, such as benzene, toluene, ethylbenzene, and xylene (BTEX) and methyl tert-butyl ether (MTBE), are potentially toxic or carcinogenic and can seriously affect water quality (Varjani et al., 2017).Demands to remediate polluted sites highlight the need to develop a variety of treatment techniques with minimal cost and without causing further environmental disturbance (Jørgensen, 2007). Bioremediation has been found to be a more reliable, lower cost, and less intrusive method than other conventional treatments (Yadav and Hassanizadeh, 2011), especially for the unsaturated zone (Das and Chandran, 2011). Enhanced bioremediation can accelerate the natural processes by which bacteria either degrade the gasoline constituents as a carbon source into less complex byproducts or complete oxidation or mineralization to CO 2 and H 2 O by providing electron acceptors and nutrients and increasing moisture (Wellman et al., 2012). Typically, for BTEX, aerobic degradation is the most rapid and complete process and is hence preferred in engineered bioremediation (Yadav and Hassanizadeh, 2011). Bioventing, infiltration, and O 2 -releasing compounds are the most common ways to deliver O 2 to the unsaturated zone (Machackova et al., 2012;Suthersan et al....

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Section: Core Ideasmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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In Situ Bioremediation of a Gasoline‐Contaminated Vadose Zone: Implications from Direct Observations

Moshkovich

Ronen

Gelman

et al. 2018

Vadose Zone Journal

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“…Oxygen can be applied by air sparging below the water table, which has been shown to enhance the rate of biological degradation of monoaromatic or oil pollutants. For oxygen generating compounds, a dilute solution is circulated through the contaminated groundwater zone in order to increase its oxygen content and enhance the rate of aerobic biodegradation [28]. However, some researches have shown that significant difficulties, such as toxicity and microbial inhibition may be encountered when using inorganic nutrients and high concentration of hydrogen peroxide [29,30].…”

Section: Engineered Bioremediationmentioning

confidence: 99%

Recent Progress in Monoaromatic Pollutants Removal from Groundwater through Bioremediation

Chen

Gao

Long

et al. 2015

ILNS

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Monoaromatic pollutants such as benzene, toluene, ethylbenzene and mixture of xylenes are now considered as widespread contaminants of groundwater. In situ bioremediation under natural attenuation or enhanced remediation has been successfully used for removal of organic pollutants, including monoaromatic compounds, from groundwater. Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water. However, engineering bioremediation is faster and more efficient. Also, studies have shown that enhanced anaerobic bioremediation can be applied for many BTEX contaminated groundwaters, as it is simple, applicable and economical. This paper reviews microbiology and metabolism of monoaromatic biodegradation and in situ bioremediation for BTEX removal from groundwater under aerobic and anaerobic conditions. It also discusses the factors affecting and limiting bioremediation processes and interactions between monoaromatic pollutants and other compounds during the remediation processes.

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Environmental Microbiology and Biotechnology: Progress and Prospects

Mukherjee¹

2014

Chemie Ingenieur Technik

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Environmental microbiology and biotechnology are crucial in the modern society. They influence human health, environment and serve as a source of energy and provider of novel bioproducts. The key areas of interest are bioremediation, microbial communities, pathogen detection, wastewater treatment, energy generation, bioprocesses, and natural product discovery. Environmental microbiology must interact with hydrology, biogeochemistry, limnology, oceanography and numerical modeling. This subject will continue to engage future generations of scientists, engineers, entrepreneurs and policy makers.

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In situ vadose zone bioremediation

Cited by 82 publications

References 50 publications

In Situ Bioremediation of a Gasoline‐Contaminated Vadose Zone: Implications from Direct Observations

In Situ Bioremediation of a Gasoline‐Contaminated Vadose Zone: Implications from Direct Observations

Recent Progress in Monoaromatic Pollutants Removal from Groundwater through Bioremediation

Environmental Microbiology and Biotechnology: Progress and Prospects

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