2021
DOI: 10.3389/fmicb.2020.619766
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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

Abstract: 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 di… Show more

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Cited by 41 publications
(22 citation statements)
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“…Metagenomic studies have been previously conducted on stable dechlorinating consortia to shed light on the metabolic features of the microbial components and their role in the RD processes under different conditions ( Brisson et al, 2012 ; Maphosa et al, 2012 ; Dam et al, 2017 ; Wang et al, 2019 ; Kucharzyk et al, 2020 ). Similarly, some metagenomic studies have also been conducted on biological systems for Cr(VI) removal to explore the metabolic potential, including Cr(VI) remediation genes, primarily in wastewater treatment systems or microbial consortia ( Miao et al, 2015 ; Sun et al, 2019 ; Pei et al, 2020 ; Rahman and Thomas, 2021 ). To the best of our knowledge, no metagenomic studies have been conducted on a bioelectrochemical system for simultaneous TCE/Cr(VI) reduction.…”
Section: Introductionmentioning
confidence: 99%
“…Metagenomic studies have been previously conducted on stable dechlorinating consortia to shed light on the metabolic features of the microbial components and their role in the RD processes under different conditions ( Brisson et al, 2012 ; Maphosa et al, 2012 ; Dam et al, 2017 ; Wang et al, 2019 ; Kucharzyk et al, 2020 ). Similarly, some metagenomic studies have also been conducted on biological systems for Cr(VI) removal to explore the metabolic potential, including Cr(VI) remediation genes, primarily in wastewater treatment systems or microbial consortia ( Miao et al, 2015 ; Sun et al, 2019 ; Pei et al, 2020 ; Rahman and Thomas, 2021 ). To the best of our knowledge, no metagenomic studies have been conducted on a bioelectrochemical system for simultaneous TCE/Cr(VI) reduction.…”
Section: Introductionmentioning
confidence: 99%
“…Under anaerobic conditions, several types of organic substrates have been reported to be able to reduce hexavalent chromium successfully, such as glucose, lactate, sucrose, milk whey, etc. [13]. Within the context of this study, molasses emulsified vegetable oil (EVO) and ferrous sulfate heptahydrate (FeSO 4 •7H 2 O) were used as electron donors, independently and as combinations.…”
Section: Microcosms Designmentioning
confidence: 99%
“…Microbial remediated Cr(VI) reduction can occur under both aerobic and anaerobic conditions and is mediated by a variety of enzymes, being cited extracellularly, intracellularly, or in the cytoplasmic membrane [13,14]. A reduction can also be induced by metabolic byproducts, such as bio-generated Fe(II), hydrogen, and/or sulfides [15][16][17].…”
Section: Introductionmentioning
confidence: 99%
“…Figure 5 depicts the intracellular and extracellular mitigation pathways for Cr (VI) by microalgae.
Figure 5 Proposed biotransformation pathways of Cr(VI) developed from the finding of ( Deng et al., 2006 ; Lee et al., 2017 ; Rahman and Thomas, 2021 ; Yen et al., 2017 ).
…”
Section: Mechanisms Of Hms Phycoremediation Using Living Microalgaementioning
confidence: 99%
“… Proposed biotransformation pathways of Cr(VI) developed from the finding of ( Deng et al., 2006 ; Lee et al., 2017 ; Rahman and Thomas, 2021 ; Yen et al., 2017 ). …”
Section: Mechanisms Of Hms Phycoremediation Using Living Microalgaementioning
confidence: 99%