Studies on Chromate Removal by Chromium-Resistant Bacillus sp. Isolated from Tannery Effluent

Chaturvedi, Manoj Kumar

doi:10.4236/jep.2011.21008

Cited by 49 publications

(14 citation statements)

References 30 publications

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“…Moreover, it has been reported that some Bacillus species are able to tolerate up to 100mg/ml of Cr within their culture media [39]. In another study, Bacillus circulans MN1 tolerated a Cr concentration of 1110 mg/L [40]. These are in concordance with the results obtained in this study.…”

Section: Resultssupporting

confidence: 82%

“…The isolate was grown in MRS broth (HiMedia, M369), without heavy metals at 37°C for 24 h. After incubation, the optical density of the broth culture was adjusted to OD600 = 0.1 using a light spectrophotometer (JENWAY, 7305). A loopful of the broth culture was then aseptically streaked onto MRS agar (HiMedia, M641) supplemented with different heavy metals (Hg, Cr, Cd, and Pb), respectively, at different concentration (10,20,30,40, and 50 ppm). The plates were then incubated at 37°C for 48 h. Single colonies or trace of growth was ignored.…”

Section: Determination Of Minimum Inhibitory Concentration (Mic)mentioning

confidence: 99%

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Bioremediation of heavy metals from aquatic environment through microbial processes: A potential role for probiotics?

2017

J App Biol Biotech

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Heavy metals can cause disastrous effects on any living organisms. Probiotics have the ability to reduce metal toxicity. Bioremediation of polluted waters using these bacteria could be an alternative to conventional remediation methods. The aim of this study was to isolate and characterize heavy metal resistant probiotics. Soil samples were collected for the isolation of probiotics. Morphological, biochemical, and molecular characterization was performed for the isolates. In addition, a preliminary heavy metal minimum inhibitory concentration test was done followed by atomic absorption spectrometry (AAS) analysis analysis. Four Enterococci (BT1, BT2, MC1, and MC2) and Bacillus acidiproducens (SM1 and SM2) were isolated. Moreover, all the isolates demonstrated probiotic characteristics. BT1 and BT2 were able to tolerate mercury (Hg), cadmium (Cd), lead (Pb), and chromium (Cr) but they demonstrated poor Hg removal abilities (0.75-1.42%). MC1 and MC2 isolates could grow in medium supplemented with Cd, Pb, and Cr, respectively. MC1 showed the highest level of Pb removal (43.00% ± 0.776%) and Cd removal (46.19% ± 7.651%) from broth media. Yet, SM1 and SM2 isolates tolerated only Pb and Cr. SM2 had the ability to remove the highest amount of Cr (43.06% ± 7.991%). These reasonable heavy metal removal abilities could be further studied for efficient use in bioremediation.

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Section: Resultssupporting

confidence: 82%

Section: Determination Of Minimum Inhibitory Concentration (Mic)mentioning

confidence: 99%

Bioremediation of heavy metals from aquatic environment through microbial processes: A potential role for probiotics?

2017

J App Biol Biotech

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“…Chromium compounds can lead to mutation and cancer, and inhibit enzymes and nucleic acid synthesis. In contrast, chromium (III) is less toxic and less mobile [2]. Chemical methods are available for removal of chromium in bulk from industrial effluent but they often fail to meet the environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

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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“…The reduction/detoxification of Cr (VI) by microbes is, however, inexpensive and environmentally safe approach and provides a viable option to protect the environment from chromium toxicity. The reduction of Cr (VI) has been reported in Bacillus (Elangovan et al, 2006;Chaturvedi, 2011), Pseudomonas sp. (Rahman et al, 2007), Escherichia coli (Bae et al, 2005), Microbacterium (Pattanapipitpaisal et al, 2001), Ochrobactrum intermedium (Faisal and Hansnain, 2005) and Micrococcus (Sultan and Hasnain, 2005).…”

Section: Introductionmentioning

confidence: 99%

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

Wani¹,

Ayoola²

2015

J. of Environmental Science and Technology

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Chromium (VI) contamination has accelerated due to rapid industrialization worldwide. Aim of this study was to check the bacterial species for their tolerance towards multiple metals, antibiotics and further check whether these bacteria are reducing Cr (VI). Bacterial strains were isolated from the industrial area situated at Lagos-Abeokuta Road, Ile Ise Awo, Abeokuta, Ogun State, Nigeria. All of the isolates showed tolerance to lead, zinc and chromium (VI). Bacterial species also showed tolerance towards antibiotics, 100% of strains were resistant to ampicillin, cotrimoxazole, colistin and gentamycin, 66.6% to nitrofurantoin and nalidixic acid, 83.3% were resistant to streptomycin whereas, 50% were resistant to tetracycline. Among all the strains, only two strains Pseudomonas strain PH2 and PH4 were chosen for chromium (VI) reduction as these strains showed maximum tolerance towards chromium (VI). Maximum reduction (60%) of chromium (VI) was observed at pH 6 by Pseudomonas spp. PH2, which was followed by pH 5 (50%) whereas, pH9 showed least reduction of 12.5%. Similarly, Pseudomonas spp. PH4 also reduced chromium considerably at pH 6 (60%), pH 5 (50%), pH 8 (37.5%) and at pH 9 (12.5%) respectively, at a concentration of 100 μg Cr mLG 1 after 120 h of incubation. The Pseudomonas species PH2 reduced chromium (VI) at concentration of 50 μg Cr mLG 1 (92%), 100 μg Cr mLG 1 (70%) and 150 μg Cr mLG 1 (50%), respectively at a pH of 6. Similarly, Pseudomonas species PH4 reduced chromium (VI) by 95% at 50 μg Cr mLG 1 , 70% at 100 μg Cr mLG 1 and 55% at 150 μg Cr mLG 1 at a pH of 6. Due to above properties strains could therefore, be used as bioremediators of metals in soils contaminated with heavy metals and can also increase the yield of various crops under heavy metal contamination.

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Studies on Chromate Removal by Chromium-Resistant Bacillus sp. Isolated from Tannery Effluent

Cited by 49 publications

References 30 publications

Bioremediation of heavy metals from aquatic environment through microbial processes: A potential role for probiotics?

Bioremediation of heavy metals from aquatic environment through microbial processes: A potential role for probiotics?

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

Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species

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