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

Contreras, Edgardo Martín; Orozco, A.M. Ferro; Zaritzky, Noemí Elisabet

doi:10.1016/j.watres.2011.03.011

Cited by 38 publications

(23 citation statements)

References 31 publications

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“…Biotransformation of heavy metals is a promising technique to convert toxic heavy metals to less toxic forms (Contreras et al 2011). Microorganisms play an important role in transformation of heavy metals from toxic form to less toxic form.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Cr(III) has a strong affinity for negatively charged ions and colloids in soils and can be precipitated as Cr(OH) 3 at neutral pH and, thus, is relatively immobile and less available for biological uptake. Conversely, hexavalent chromium has a higher solubility and mobility, and is more bioavailable than Cr(III) (Contreras et al 2011). Therefore, transformation of Cr(VI) to Cr(III) is an effective measure to reduce the hazardous effect of Cr(VI) on our environment.…”

Section: Introductionmentioning

confidence: 99%

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Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product

Jian

Liu

et al. 2015

Water Air Soil Pollut

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Microbial Cr(VI) reduction is a significant process in detoxification of Cr(VI) pollution. In this study, a new Cr(VI)-reducing bacterial strain, Cr-4, was isolated from soil around the chromiumcontaining slag. The analysis of the 16S ribosomal RNA (rRNA) gene sequence revealed that the newly isolated strain was closely related to Bacillus anthracis. The response to Cr(VI) stress and reduction capacity of the isolate were investigated. Cell growth decreased with the increase of Cr(VI) concentration. Cell morphology varied and cell growth was inhibited remarkably in the presence of 125 mg/L Cr(VI). The strain grew well and removed Cr(VI) effectively at a Cr(VI) concentration lower than 50 mg/L. Cr(VI)-reducing activity was inhibited by Zn 2+ , while significantly stimulated by Cu 2+ . The activity of Cr(VI) reduction by cell-free extract was demonstrated. Total chromium analysis and the energy-dispersive X-ray analysis (EDAX) spectrum revealed that Cr(VI) removal was caused mainly by microbial reduction rather than by biosorption and the main part of the reduced Cr(III) existed as soluble form in solutions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product

Jian

Liu

et al. 2015

Water Air Soil Pollut

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“…In contrast, Cr(VI) species are known to be highly toxic and readily mobile in biological systems, causing serious health problems such as liver damage and pulmonary complications (Eary and Rai, 1988;Yurik and Pikaev, 1999). Therefore, Cr(VI) reduction methods for remediating Crcontaminated sites have been actively investigated, including conventional chemical reduction (Lan et al, 2005(Lan et al, , 2006Li et al, 2007); photocatalytic reduction (Gaberell et al, 2003;Sun et al, 2009;Tian et al, 2010); electrochemical reduction (Lakshmipathiraj et al, 2008;Olmez, 2009); and bioreduction (Cheung and Gu, 2007;Patra et al, 2010;Contreras et al, 2011). Cr(III), the product of Cr(VI) reduction, is subsequently removed from 2006; Zhou et al, 2007); however, the extremely fine particle sizes of schwertmannite render it very difficult to be utilized in combination with traditional filtration techniques in practice, i.e., solid-liquid separation (Eskandarpour et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) removal by biogenic schwertmannite in continuous flow column

Chen

Zhang

et al. 2014

Geochem. J.

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“…Individual removal of Cr(VI) 32 or dye 33 have been reported in the literature by various researchers. Whereas, few reports are available on simultaneous removal of dye and Cr(VI) by using bacterial isolates in pure culture or in a consortium.…”

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confidence: 99%

Removal of a reactive dye and hexavalent chromium by a reusable bacteria attached electrospun nanofibrous web

et al. 2015

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A contaminant resistant Lysinibacillus sp. NOSK was isolated from a soil sample and its Reactive Black 5 (RB5) and Cr(VI) removal efficiencies were investigated as a function of changes in the initial pH values, temperature, static/shaking conditions, reactive dye and Cr(VI) concentrations. In this study, an electrospun polysulfone nanofibrous web (PSU-NFW) was found to be effective in attachment of bacterial cells. Bacteria attached PSU-NFWs (bacteria/PSU-NFW) have shown highly efficient removal of RB5, as 99.7 AE 0.9% and 35.8 AE 0.4% for the pristine PSU-NFW. Moreover, the highest Cr(VI) removal efficiencies measured were 98.2 AE 0.6% for bacteria attached PSU-NFW and 32.6 AE 0.6% for the pristine PSU-NFW. Simultaneous removal of RB5 and Cr(VI) were also investigated. Reusability test results indicate that, bacteria/PSU-NFW can be reused for at least 7 cycles with 28.1 AE 0.6% and 66.7 AE 0.8% removal efficiencies for RB5 and Cr(VI), respectively.

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

Cited by 38 publications

References 31 publications

Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product

Bioreduction of Chromate by an Isolated Bacillus anthracis Cr-4 with Soluble Cr(III) Product

Cr(VI) removal by biogenic schwertmannite in continuous flow column

Removal of a reactive dye and hexavalent chromium by a reusable bacteria attached electrospun nanofibrous web

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