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  1. Article: Denitrification Biokinetics: Towards Optimization for Industrial Applications.

    Suri, Navreet / Zhang, Yuan / Gieg, Lisa M / Ryan, M Cathryn

    Frontiers in microbiology

    2021  Volume 12, Page(s) 610389

    Abstract: Denitrification is a microbial process that converts nitrate ( ... ...

    Abstract Denitrification is a microbial process that converts nitrate (NO
    Language English
    Publishing date 2021-05-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.610389
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Microbially Enhanced Oil Recovery by Alkylbenzene-Oxidizing Nitrate-Reducing Bacteria.

    Suri, Navreet / Gassara, Fatma / Stanislav, Paul / Voordouw, Gerrit

    Frontiers in microbiology

    2019  Volume 10, Page(s) 1243

    Abstract: Microbially enhanced oil recovery (MEOR) of heavy oil and bitumen is challenging because light hydrocarbons, which can feed resident microbial communities are present in low concentrations, if at all. We have recently shown that increasing the toluene ... ...

    Abstract Microbially enhanced oil recovery (MEOR) of heavy oil and bitumen is challenging because light hydrocarbons, which can feed resident microbial communities are present in low concentrations, if at all. We have recently shown that increasing the toluene concentration of heavy oil by aqueous injection followed by injection of nitrate boosts the activity of toluene-oxidizing nitrate-reducing bacteria in heavy oil-containing sand pack columns, giving production of residual oil in place (ROIP). In the current work we found that ethylbenzene is as effective as toluene. Microbial community analyses indicated
    Language English
    Publishing date 2019-06-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2019.01243
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: The Effectiveness of Nitrate-Mediated Control of the Oil Field Sulfur Cycle Depends on the Toluene Content of the Oil.

    Suri, Navreet / Voordouw, Johanna / Voordouw, Gerrit

    Frontiers in microbiology

    2017  Volume 8, Page(s) 956

    Abstract: The injection of nitrate is one of the most commonly used technologies to impact the sulfur cycle in subsurface oil fields. Nitrate injection enhances the activity of nitrate-reducing bacteria, which produce nitrite inhibiting sulfate-reducing bacteria ( ... ...

    Abstract The injection of nitrate is one of the most commonly used technologies to impact the sulfur cycle in subsurface oil fields. Nitrate injection enhances the activity of nitrate-reducing bacteria, which produce nitrite inhibiting sulfate-reducing bacteria (SRB). Subsequent reduction of nitrate to di-nitrogen (N
    Language English
    Publishing date 2017-05-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2017.00956
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Nitrate-Mediated Microbially Enhanced Oil Recovery (N-MEOR) from model upflow bioreactors.

    Gassara, Fatma / Suri, Navreet / Voordouw, Gerrit

    Journal of hazardous materials

    2016  Volume 324, Issue Pt A, Page(s) 94–99

    Abstract: Microbially Enhanced Oil Recovery (MEOR) can enhance oil production with less energy input and less costs than other technologies. The present study used different aqueous electron donors (acetate, glucose, molasses) and an aqueous electron acceptor ( ... ...

    Abstract Microbially Enhanced Oil Recovery (MEOR) can enhance oil production with less energy input and less costs than other technologies. The present study used different aqueous electron donors (acetate, glucose, molasses) and an aqueous electron acceptor (nitrate) to stimulate growth of heterotrophic nitrate reducing bacteria (hNRB) to improve production of oil. Initial flooding of columns containing heavy oil (viscosity of 3400cP at 20°C) with CSBK (Coleville synthetic brine medium) produced 0.5 pore volume (PV) of oil. Bioreactors were then inoculated with hNRB with 5.8g/L of molasses and 0, 10, 20, 40, 60 or 80mM nitrate, as well as with 17mM glucose or 57mM acetate and 80mM nitrate. During incubations no oil was produced in the bioreactors that received 5.8g/L of molasses and 0, 10, 20, 40 or 60mM nitrate. However, the bioreactors injected with 5.8g/L of molasses, 17mM glucose or 57mM acetate and 80mM nitrate produced 13.9, 11.3±3.1 and 17.8±6.6% of residual oil, respectively. The significant production of oil from these bioreactors may be caused by N
    MeSH term(s) Bacteria ; Bioreactors ; Electrons ; Emulsions ; Heterotrophic Processes ; Industrial Waste ; Molasses/microbiology ; Nitrates/metabolism ; Oxidation-Reduction ; Petroleum/metabolism ; Surface Tension ; Viscosity
    Chemical Substances Emulsions ; Industrial Waste ; Nitrates ; Petroleum
    Language English
    Publishing date 2016-03-08
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2015.12.039
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Nitrate-Mediated Microbially Enhanced Oil Recovery (N-MEOR) from model upflow bioreactors

    Gassara, Fatma / Gerrit Voordouw / Navreet Suri

    Journal of hazardous materials. 2017 Feb. 15, v. 324

    2017  

    Abstract: Microbially Enhanced Oil Recovery (MEOR) can enhance oil production with less energy input and less costs than other technologies. The present study used different aqueous electron donors (acetate, glucose, molasses) and an aqueous electron acceptor ( ... ...

    Abstract Microbially Enhanced Oil Recovery (MEOR) can enhance oil production with less energy input and less costs than other technologies. The present study used different aqueous electron donors (acetate, glucose, molasses) and an aqueous electron acceptor (nitrate) to stimulate growth of heterotrophic nitrate reducing bacteria (hNRB) to improve production of oil. Initial flooding of columns containing heavy oil (viscosity of 3400cP at 20°C) with CSBK (Coleville synthetic brine medium) produced 0.5 pore volume (PV) of oil. Bioreactors were then inoculated with hNRB with 5.8g/L of molasses and 0, 10, 20, 40, 60 or 80mM nitrate, as well as with 17mM glucose or 57mM acetate and 80mM nitrate. During incubations no oil was produced in the bioreactors that received 5.8g/L of molasses and 0, 10, 20, 40 or 60mM nitrate. However, the bioreactors injected with 5.8g/L of molasses, 17mM glucose or 57mM acetate and 80mM nitrate produced 13.9, 11.3±3.1 and 17.8±6.6% of residual oil, respectively. The significant production of oil from these bioreactors may be caused by N2-CO2 gas production. Following continued injection with CSBK without nitrate, subsequent elution of significant residual oil (5–30%) was observed. These results also indicate possible involvement of fermentation products (organic acids, alcohols) to enhance heavy oil recovery.
    Keywords acetates ; alcohols ; bioreactors ; denitrifying bacteria ; energy ; fermented foods ; glucose ; models ; molasses ; nitrates ; oils ; organic acids and salts ; viscosity
    Language English
    Dates of publication 2017-0215
    Size p. 94-99.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1491302-1
    ISSN 1873-3336 ; 0304-3894
    ISSN (online) 1873-3336
    ISSN 0304-3894
    DOI 10.1016/j.jhazmat.2015.12.039
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Microbially Enhanced Oil Recovery by Sequential Injection of Light Hydrocarbon and Nitrate in Low- And High-Pressure Bioreactors.

    Gassara, Fatma / Suri, Navreet / Stanislav, Paul / Voordouw, Gerrit

    Environmental science & technology

    2015  Volume 49, Issue 20, Page(s) 12594–12601

    Abstract: Microbially enhanced oil recovery (MEOR) often involves injection of aqueous molasses and nitrate to stimulate resident or introduced bacteria. Use of light oil components like toluene, as electron donor for nitrate-reducing bacteria (NRB), offers ... ...

    Abstract Microbially enhanced oil recovery (MEOR) often involves injection of aqueous molasses and nitrate to stimulate resident or introduced bacteria. Use of light oil components like toluene, as electron donor for nitrate-reducing bacteria (NRB), offers advantages but at 1-2 mM toluene is limiting in many heavy oils. Because addition of toluene to the oil increased reduction of nitrate by NRB, we propose an MEOR technology, in which water amended with light hydrocarbon below the solubility limit (5.6 mM for toluene) is injected to improve the nitrate reduction capacity of the oil along the water flow path, followed by injection of nitrate, other nutrients (e.g., phosphate) and a consortium of NRB, if necessary. Hydrocarbon- and nitrate-mediated MEOR was tested in low- and high-pressure, water-wet sandpack bioreactors with 0.5 pore volumes of residual oil in place (ROIP). Compared to control bioreactors, those with 11-12 mM of toluene in the oil (gained by direct addition or by aqueous injection) and 80 mM of nitrate in the aqueous phase produced 16.5 ± 4.4% of additional ROIP (N = 10). Because toluene is a cheap commodity chemical, HN-MEOR has the potential to be a cost-effective method for additional oil production even in the current low oil price environment.
    MeSH term(s) Bacteria ; Bioreactors/microbiology ; Hydraulic Fracking/methods ; Hydrocarbons ; Nitrates ; Petroleum/microbiology ; Toluene ; Water
    Chemical Substances Hydrocarbons ; Nitrates ; Petroleum ; Water (059QF0KO0R) ; Toluene (3FPU23BG52)
    Language English
    Publishing date 2015-10-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.5b03879
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Microbially Enhanced Oil Recovery by Sequential Injection of Light Hydrocarbon and Nitrate in Low- And High-Pressure Bioreactors

    Gassara, Fatma / Stanislav Paul / Suri Navreet / Voordouw Gerrit

    Environmental Science & Technology. 2015 Oct. 20, v. 49, no. 20

    2015  

    Abstract: Microbially enhanced oil recovery (MEOR) often involves injection of aqueous molasses and nitrate to stimulate resident or introduced bacteria. Use of light oil components like toluene, as electron donor for nitrate-reducing bacteria (NRB), offers ... ...

    Abstract Microbially enhanced oil recovery (MEOR) often involves injection of aqueous molasses and nitrate to stimulate resident or introduced bacteria. Use of light oil components like toluene, as electron donor for nitrate-reducing bacteria (NRB), offers advantages but at 1–2 mM toluene is limiting in many heavy oils. Because addition of toluene to the oil increased reduction of nitrate by NRB, we propose an MEOR technology, in which water amended with light hydrocarbon below the solubility limit (5.6 mM for toluene) is injected to improve the nitrate reduction capacity of the oil along the water flow path, followed by injection of nitrate, other nutrients (e.g., phosphate) and a consortium of NRB, if necessary. Hydrocarbon- and nitrate-mediated MEOR was tested in low- and high-pressure, water-wet sandpack bioreactors with 0.5 pore volumes of residual oil in place (ROIP). Compared to control bioreactors, those with 11–12 mM of toluene in the oil (gained by direct addition or by aqueous injection) and 80 mM of nitrate in the aqueous phase produced 16.5 ± 4.4% of additional ROIP (N = 10). Because toluene is a cheap commodity chemical, HN-MEOR has the potential to be a cost-effective method for additional oil production even in the current low oil price environment.
    Keywords bioreactors ; cost effectiveness ; denitrifying bacteria ; molasses ; nitrate reduction ; nitrates ; nutrients ; oils ; phosphates ; prices ; solubility ; toluene ; water flow
    Language English
    Dates of publication 2015-1020
    Size p. 12594-12601.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1520-5851
    DOI 10.1021%2Facs.est.5b03879
    Database NAL-Catalogue (AGRICOLA)

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