Hexavalent chromium reduction by aerobic heterotrophic bacteria indigenous to chromite mine overburden

Dey, Satarupa; Paul, A. K.

doi:10.1590/s1517-83822013000100045

Cited by 24 publications

(8 citation statements)

References 35 publications

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“…The dust typically contains high levels of Cr, Si, Fe, Al, Mg and C. The leachable Cr(VI) concentrations in both stainless steel and ferrochrome fine dusts are reported to exceed the regulation limits of 0.05 mg/L for Cr(VI) in drinking water and 2 mg/L total limit in South Africa (Ma and Garbers-Craig 2006). Natural leaching and environmental exposure to these ferrochrome waste products often result in the formation and remobilization of Cr(VI) in the environment, which becomes a serious concern for groundwater pollution and soil contamination (Dhal et al 2013;Satarupa and Paul 2013). deposits (Motzer and Engineers 2004).…”

Section: Ferrochrome Process and Ferrochrome Wastementioning

confidence: 99%

Chromium in Environment, Its Toxic Effect from Chromite-Mining and Ferrochrome Industries, and Its Possible Bioremediation

2018

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Section: Ferrochrome Process and Ferrochrome Wastementioning

confidence: 99%

Chromium in Environment, Its Toxic Effect from Chromite-Mining and Ferrochrome Industries, and Its Possible Bioremediation

2018

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“…Many microorganisms capable of reducing Cr(VI) under anaerobic conditions have been reported. These strains include Pseudomonas dechromaticans , P. chromatophilia , Aeromonas dechromatica , Desulfovibrio desulfuricans , D. vulgaris , Geobacter metallireducens , Shewanella putrefaciens , S. oneidensis , Pantoea agglomerans , Agrobacterium radiobacter , Thermoanaerobacter ethanolicus , Pyrobaculum islandicum , and Exiguobacterium aurantiacum [ 20 , 21 ]. These bacteria exhibit potentials for in situ or ex situ measurements Cr(VI) when used in an MFC.…”

Section: Introductionmentioning

confidence: 99%

A Green Microbial Fuel Cell-Based Biosensor for In Situ Chromium (VI) Measurement in Electroplating Wastewater

Tsai

Liu

et al. 2017

Sensors

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The extensive use of Cr(VI) in many industries and the disposal of Cr(VI)-containing wastes have resulted in Cr(VI)-induced environmental contamination. Cr(VI) compounds are associated with increased cancer risks; hence, the detection of toxic Cr(VI) compounds is crucial. Various methods have been developed for Cr(VI) measurement, but they are often conducted offsite and cannot provide real-time toxicity monitoring. A microbial fuel cell (MFC) is an eco-friendly and self-sustaining device that has great potential as a biosensor for in situ Cr(VI) measurement, especially for wastewater generated from different electroplating units. In this study, Exiguobacterium aestuarii YC211, a facultatively anaerobic, Cr(VI)-reducing, salt-tolerant, and exoelectrogenic bacterium, was isolated and inoculated into an MFC to evaluate its feasibility as a Cr(VI) biosensor. The Cr(VI) removal efficiency of E. aestuarii YC211 was not affected by the surrounding environment (pH 5–9, 20–35 °C, coexisting ions, and salinity of 0–15 g/L). The maximum power density of the MFC biosensor was 98.3 ± 1.5 mW/m2 at 1500 Ω. A good linear relationship (r2 = 0.997) was observed between the Cr(VI) concentration (2.5–60 mg/L) and the voltage output. The developed MFC biosensor is a simple device that can accurately measure Cr(VI) concentrations in the actual electroplating wastewater that is generated from different electroplating units within 30 min with low deviations (−6.1% to 2.2%). After treating the actual electroplating wastewater with the MFC, the predominant family in the biofilm was found to be Bacillaceae (95.3%) and was further identified as the originally inoculated E. aestuarii YC211 by next generation sequencing (NGS). Thus, the MFC biosensor can measure Cr(VI) concentrations in situ in the effluents from different electroplating units, and it can potentially help in preventing the violation of effluent regulations.

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“… Megharaj et al, 2003 ; Satarupa and Paul, 2013 ; Ziagova et al, 2014 ). Glucose, being the most easily metabolized carbon source, can deliver maximum electrons for Cr(VI) reduction.…”

Section: Electron Donorsmentioning

confidence: 99%

Chemical-Assisted Microbially Mediated Chromium (Cr) (VI) Reduction Under the Influence of Various Electron Donors, Redox Mediators, and Other Additives: An Outlook on Enhanced Cr(VI) Removal

Rahman

Thomas

2021

Front. Microbiol.

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Chromium (Cr) (VI) is a well-known toxin to all types of biological organisms. Over the past few decades, many investigators have employed numerous bioprocesses to neutralize the toxic effects of Cr(VI). One of the main process for its treatment is bioreduction into Cr(III). Key to this process is the ability of microbial enzymes, which facilitate the transfer of electrons into the high valence state of the metal that acts as an electron acceptor. Many underlying previous efforts have stressed on the use of different external organic and inorganic substances as electron donors to promote Cr(VI) reduction process by different microorganisms. The use of various redox mediators enabled electron transport facility for extracellular Cr(VI) reduction and accelerated the reaction. Also, many chemicals have employed diverse roles to improve the Cr(VI) reduction process in different microorganisms. The application of aforementioned materials at the contaminated systems has offered a variety of influence on Cr(VI) bioremediation by altering microbial community structures and functions and redox environment. The collective insights suggest that the knowledge of appropriate implementation of suitable nutrients can strongly inspire the Cr(VI) reduction rate and efficiency. However, a comprehensive information on such substances and their roles and biochemical pathways in different microorganisms remains elusive. In this regard, our review sheds light on the contributions of various chemicals as electron donors, redox mediators, cofactors, etc., on microbial Cr(VI) reduction for enhanced treatment practices.

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Hexavalent chromium reduction by aerobic heterotrophic bacteria indigenous to chromite mine overburden

Cited by 24 publications

References 35 publications

Chromium in Environment, Its Toxic Effect from Chromite-Mining and Ferrochrome Industries, and Its Possible Bioremediation

Chromium in Environment, Its Toxic Effect from Chromite-Mining and Ferrochrome Industries, and Its Possible Bioremediation

A Green Microbial Fuel Cell-Based Biosensor for In Situ Chromium (VI) Measurement in Electroplating Wastewater

Chemical-Assisted Microbially Mediated Chromium (Cr) (VI) Reduction Under the Influence of Various Electron Donors, Redox Mediators, and Other Additives: An Outlook on Enhanced Cr(VI) Removal

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