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Guertin, Jacques; Avakian, Cynthia; Jacobs, James B.

doi:10.1201/9780203487969.axig

Cited by 7 publications

(11 citation statements)

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“…As a transition metal with six valence electrons, chromium can occupy different oxidation states from −4 to +6. Still, there are only three stable forms in nature: Cr 0 (or metallic chromium), Cr(III), and Cr (VI) (Guertin et al 2005). Chromium deposits in the earth's crust are in the form of trivalent chromium, and high concentration of hexavalent chromium is typically a result of human activity.…”

Section: Hexavalent Chromiummentioning

confidence: 99%

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Bioremediation of Chlorate and Chromium Contamination with Native Microbial Culture in Cold Climate

Motevasselin,

Gorczyca,

Kalinovich

et al. 2023

Groundwater Monitoring Rem

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Chlorate and hexavalent chromium are two chemicals with adverse health effects that may cause groundwater contamination in industrial areas. The objective of this study was to determine if the native microorganisms collected from a site contaminated with chlorate and chromate can lower the concentration of these chemicals in groundwater to acceptable regulatory levels. Several anaerobic microcosm experiments were conducted with synthetic groundwater (media), native microorganisms, acetate as an electron donor, nitrogen, phosphorus, and minerals. The microorganisms utilized 2200 mg/L acetate to remove 1000 mg/L of chlorate and 3 mg/L of hexavalent chromium entirely from the media provided that the groundwater is supplemented with additional nitrogen and phosphorous (with the Carbon:Nitrogen:Phosphorous molar ratio of 100:10:5). The added trace minerals solution prepared based on American Type Culture Collection (ATCC) 1191 medium did not improve the remediation process. Native microbial culture derived from the contaminated site removed the chlorate and chromate from the synthetic groundwater at 20 °C in about 40 days. The same removal was achieved at 10 °C, but in a longer timespan of 80 days. This work confirmed the importance of ensuring the presence of sufficient N and P to stimulate chlorate‐ and chromate‐reducing bacteria in the groundwaters.

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Section: Hexavalent Chromiummentioning

confidence: 99%

“…Trivalent chromium does not show any toxic effect, skin allergic reaction or asthma if the dose is less than 5 g/kg body weight (WHO 2009). Reducing chromium to a lower oxidation state decreases its toxicity in contaminated environments (Guertin et al 2005).…”

Section: Hexavalent Chromiummentioning

confidence: 99%

Bioremediation of Chlorate and Chromium Contamination with Native Microbial Culture in Cold Climate

Motevasselin,

Gorczyca,

Kalinovich

et al. 2023

Groundwater Monitoring Rem

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“…The extensive use of chromium in several industries such as petroleum refining, metal finishing, leather tanning, iron and steel industries, inorganic chemical production, textile manufacturing and pulp production have largely contributed to its wide spread in the environment (Katz and Salem, 1994;Guertin et al, 2005). Although chromium has several oxidation states, chromium compounds mainly occur as Cr(III) or Cr (VI).…”

Section: Introductionmentioning

confidence: 99%

Biological Cr(VI) removal coupled with biomass growth, biomass decay, and multiple substrate limitation

2011

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“…Currently there are many industrial sites in the world that have been contaminated with Cr(VI) due to inefficient containment of process solutions containing Cr(VI). In the US there has been an ongoing effort to clean up these sites by treating the ground water on site (1). One way to convert Cr(VI) to Cr(III) at the site is to reduce the Cr(VI) using Fe(II) generated from the iron anode of a Parallel Plate Electrochemical Reactor (PPER).…”

Section: University Of South Carolina Columbia Sc 29208mentioning

confidence: 99%

Simulation of Reduction of Cr(VI) by Fe(II) Produced Electrochemically in a Parallel Plate Electrochemical Reactor

Rayman

White

2009

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A model is presented for the reduction of hexavalent chromium in a parallel-plate electrochemical reactor via a homogenous reaction between Cr͑VI͒ and Fe͑II͒ generated at the iron anode. The effects of the space velocity of the feed solution, the concentration of supporting electrolyte, the distance between the electrodes, and the cell potential on conversion of Cr͑VI͒ to Cr͑III͒, are discussed. This study indicates that for reduction of Cr͑VI͒ using Fe͑II͒, the space velocity must be maintained below 0.02 s −1 or the system becomes limited by the rate of reduction of Cr͑VI͒ by Fe͑II͒. Increasing the current density by increasing the cell potential, increasing the amount of supporting electrolyte, and decreasing the distance between the electrodes increases single pass conversion of Cr͑VI͒ to Cr͑III͒; however, increasing the current density also increases the specific energy required by the system.

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Cited by 7 publications

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Bioremediation of Chlorate and Chromium Contamination with Native Microbial Culture in Cold Climate

Bioremediation of Chlorate and Chromium Contamination with Native Microbial Culture in Cold Climate

Biological Cr(VI) removal coupled with biomass growth, biomass decay, and multiple substrate limitation

Simulation of Reduction of Cr(VI) by Fe(II) Produced Electrochemically in a Parallel Plate Electrochemical Reactor

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