Cr(VI) Reduction by
            <b>
              <i>Bacillus coagulans</i>
            </b>
            Isolated from Contaminated Soils

Philip, Ligy; Iyengar, Leela; Venkobachar, C.

doi:10.1061/(asce)0733-9372(1998)124:12(1165)

Cited by 116 publications

(67 citation statements)

References 7 publications

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“…This may be due to the fact that higher number of bacterial cells reduces the probability of contact between bacteria cells and chromium. Similar observation was made by another group of researchers who reported higher biotransformation of chromium (VI) to chromium (II) at lower cell density [16]. Chromium (VI) removal by Bacillus subtilis was found to depend on temperature.…”

Section: Resultssupporting

confidence: 72%

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

Basu¹,

Dasgupta²,

Chakraborty³

2014

IJBBB

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Abstract-Chromium (VI), one of the major pollutants released from tanneries, dye and textile industries, is highly toxic and carcinogenic in nature. Chemical methods for bulk treatment of industrial effluents often fail to reduce the level to meet the environmental regulations. For end of the pipe treatment, bioremediation is considered a better alternative. East Calcutta Wetlands, the major sewage treatment site of Kolkata (previously known as Calcutta), has been reported to be contaminated with several heavy metals including chromium (VI). Therefore, there is a possibility that bacterial population of this region can tolerate chromium (VI) and would be useful for bioremediation of chromium (VI). A strain of Bacillus subtilis isolated from this region was grown in presence of chromium (VI) (2.5 g/L-7.5 5 g/L). There were 97% and 90% reduction of residual chromium concentration in growth media after 24 hours with initial concentrations of 2.5 g/L and 5 g/L respectively. Best removal was observed at 30C. Growth of the Bacillus strain in presence of chromium (VI) was found to be best fit for Tessier model by non-linear regression analysis using MATLAB® 7.4. The Bacillus strain has the potential for the end of the pipe treatment removal of chromium (VI).

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Section: Resultssupporting

confidence: 72%

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

Basu¹,

Dasgupta²,

Chakraborty³

2014

IJBBB

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“…It has also been reported that under anaerobic conditions and in the presence of exogenous electron donor, Cr (VI) might act as a terminal electron acceptor and might be reduced through membrane-bound reductase activity [33,34]. Accordingly, the product of Cr (III) can be retained in a soluble form or precipitated intracellularly or extracellularly as Cr(OH) 3 or carbonate-based products depending on the microbial strains and carbon source types [31][32][33][34][35][36].…”

Section: Chromium Balance In Mfcmentioning

confidence: 99%

Enhancement of hexavalent chromium reduction and electricity production from a biocathode microbial fuel cell

Huang

Chen

Quan

et al. 2010

Bioprocess Biosyst Eng

134

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Enhancement of Cr (VI) reduction rate and power production from biocathode microbial fuel cells (MFCs) was achieved using indigenous bacteria from Cr (VI)-contaminated site as inoculum and MFC architecture with a relatively large cathode-specific surface area of 340-900 m2 m(-3). A specific Cr (VI) reduction rate of 2.4 ± 0.2 mg g(-1)VSS h(-1) and a power production of 2.4 ± 0.1 W m(-3) at a current density of 6.9 A m(-3) were simultaneously achieved at an initial Cr (VI) concentration of 39.2 mg L(-1). Initial Cr (VI) concentration and solution conductivity affected Cr (VI) reduction rate, power production and coulombic efficiency. These findings demonstrate the importance of inoculation and MFC architecture in the enhancement of Cr (VI) reduction rate and power production. This study is a beneficial attempt to improve the efficiency of biocathode MFCs and provide a good candidate of bioremediation process for Cr (VI)-contaminated sites.

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“…7a and b demonstrate that a linear relationship was observed for I max and OCV III as a function of DNA with a correlation coefficient (R 2 ) of 0.74 and 0.89, respectively, implying that cell growth was also an essential factor affecting the AQS-mediated EET. The results of cell growth in the anaerobic cuvettes showed that the optimal pH of MR-1 was 7.0, indicating that the fastest rates of cell growth occurred at pH 7 [44], so it is not surprising that a high cell density leads to a high lactate consumption rate and a high electron output via IET and EET, resulting in the linear correlation between OCV III and total DNA. In addition, it was noted that the R 2 value of OCV III vs. total DNA (0.89) was much higher than that of OCV III vs. E m (0.21), suggesting that the contribution of pH-dependent cell growth was much greater than the contribution of pH-dependent AQS redox properties to the overall quinone-mediated EET capacity.…”

Section: Role Of Ph-dependent Cell Growthmentioning

confidence: 99%

pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system

Liu

et al. 2016

Electrochimica Acta

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Cr(VI) Reduction by Bacillus coagulans Isolated from Contaminated Soils

Cited by 116 publications

References 7 publications

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

Removal of Chromium (VI) by Bacillus subtilis Isolated from East Calcutta Wetlands, West Bengal, India

Enhancement of hexavalent chromium reduction and electricity production from a biocathode microbial fuel cell

pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system

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