Reduction of hexavalent chromium by <i>Bacillus</i> sp. isolated from chromite mine soils and characterization of reduced product

Dhal, Biswaranjan; Thatoi, Hrudayanath; Das, Nigamananda; Pandey, B.D.

doi:10.1002/jctb.2451

Cited by 145 publications

(72 citation statements)

References 30 publications

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“…As observed, the broad absorption bands appeared at *3500 and 3269 cm -1 are respectively attributed to OH and NH stretching modes of polysaccharides and proteins. Similar stretching has also been reported by Dhal et al [39]. A strong peak at 1078 cm -1 corresponds to stretching vibration of C=O bond of polysaccharides.…”

Section: Spectral Analysessupporting

confidence: 88%

Enhancing Degradation of Low Density Polyethylene Films by Curvularia lunata SG1 Using Particle Swarm Optimization Strategy

Raut

Sharma

et al. 2015

Indian J Microbiol

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In the present study, artificial neural network (ANN) modelling coupled with particle swarm optimization (PSO) algorithm was used to optimize the process variables for enhanced low density polyethylene (LDPE) degradation by Curvularia lunata SG1. In the non-linear ANN model, temperature, pH, contact time and agitation were used as input variables and polyethylene bio-degradation as the output variable. Further, on application of PSO to the ANN model, the optimum values of the process parameters were as follows: pH = 7.6, temperature = 37.97°C, agitation rate = 190.48 rpm and incubation time = 261.95 days. A comparison between the model results and experimental data gave a high correlation coefficient (R 2 ANN ¼ 0:999). Significant enhancement of LDPE bio-degradation using C. lunata SG1by about 48 % was achieved under optimum conditions. Thus, the novelty of the work lies in the application of combination of ANN-PSO as optimization strategy to enhance the bio-degradation of LDPE.Electronic supplementary material The online version of this article

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Section: Spectral Analysessupporting

confidence: 88%

Enhancing Degradation of Low Density Polyethylene Films by Curvularia lunata SG1 Using Particle Swarm Optimization Strategy

Raut

Sharma

et al. 2015

Indian J Microbiol

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“…This trend may be due to the synergistic effect of the strains in consortium form (Khehra et al, 2005;Saratale et al, 2009).Similarly another important finding of our study is that at higher concentrations of both Cr and azo dye reactive black-5, there was significant reduction in decolorization process occurred. The inhibiting effect on the decreasing the performance of bacteria might be due to the reason of toxic effect of these contaminants at increased concentration for bacterial cells (Dhal et al, 2010;Dey and Paul, 2012). Another important factor for this reduction can be the due to the production of morphological changes and oxidative stress on bacterial cell (Desai et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

Khalid¹,

Arshad²,

Mahmood³

et al. 2015

IJAB

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To cite his paper: Khalid, A., J. Arshad, S. Mahmood, I. Aziz and M. Arshad, 2015 AbstractAzo dyes and chromium (Cr) are released in the wastewater of leather processing industry during tanning process. Several species of bacteria have shown ability to degrade azo dyes individually; however, presence of Cr ions in industrial effluents may affect the bacterial efficiency of removing azo dyes from waste water. In this study, biodegradation of reactive black-5 dye was studied in a mineral salts medium (MSM) liquid culture in the presence of Cr ions. Two bacterial strains Psychrobacter alimentarius KS23 and Klebsiella oxytoca N7 capable of degrading azo dyes were used individually as well as in a consortium for the degradation of azo dyes. Cr was applied in the form of K2Cr2O7, CrCl3, Cr2(SO4)3 at different concentrations (ranging from 0-250 mg L -1 ) of Cr. The results showed that presence of Cr in mineral salt medium significantly inhibited the azo dye decolorization. In the absence of Cr salts, complete decolorization of 100 mg dye L -1 was achieved by the bacterial strains in 8-12 h while up to 83% decolorization occurred in 72 h at 100 mg L -1 Cr. The rate of decolorization considerably decreased with increasing concentration of azo dye in the presence of 50 mg Cr L -1 medium. These findings imply that the existence of Cr in wastewater can significantly affect the bacterial efficiency in wastewater treatment systems to degrade azo dyes.

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“…Generally, chromite is chemically inert and insoluble in water. The annual production of chromite ore was 23,700-24,000 x10 3 [8]. Chromium is extensively used in metallurgical and chemical industries for the production of ferrochrome and chemicals, such as sodium dichromate.…”

Section: Chromitementioning

confidence: 99%

“…These waste piles contain waste rocks, unwanted minerals, low-grade chromite ores, and soils. Natural leaching and weathering process occurring in these materials frequently cause hexavalent chromium production and percolation, causing environmental contamination and pollution [8,27].…”

Section: Chromium Pollutionmentioning

confidence: 99%

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The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

Al-Battashi

Joshi²,

Pracejus³

et al. 2016

TOBIOTJ

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Abstract:The role and significance of microorganisms in environmental recycling activities marks geomicrobiology one of the essential branches within the environmental biotechnology field. Naturally occurring microbes also play geo-active roles in rocks, leading to biomineralization or biomobilization of minerals and metals. Heavy metals, such as chromium (Cr), are essential micronutrients at very low concentrations, but are very toxic at higher concentrations. Generally, heavy metals are leached to the environment through natural processes or anthropogenic activities such as industrial processes, leading to pollution with serious consequences. The presence of potentially toxic heavy metals, including Cr, in soils does not necessarily result in toxicity because not all forms of metals are toxic. Microbial interaction with Cr by different mechanisms leads to its oxidation or reduction, where its toxicity could be increased or decreased. Chromite contains both Cr(III) and Fe(II) and microbial utilization of Fe(II)-Fe(III) conversion or Cr (III) -Cr (VI) could lead to the break-down of this mineral. Therefore, the extraction of chromium from its mineral as Cr (III) form increases the possibility of its oxidation and conversion to the more toxic form (Cr (VI)), either biologically or geochemically. Cr (VI) is quite toxic to plants, animals and microbes, thus its levels in the environment need to be studied and controlled properly. Several bacterial and fungal isolates showed high tolerance and resistance to toxic Cr species and they also demonstrated transformation to less toxic form Cr (III), and precipitation. The current review highlights toxicity issues associated with Cr species and environmental friendly bioremediation mediated by microorganisms.

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Reduction of hexavalent chromium by Bacillus sp. isolated from chromite mine soils and characterization of reduced product

Cited by 145 publications

References 30 publications

Enhancing Degradation of Low Density Polyethylene Films by Curvularia lunata SG1 Using Particle Swarm Optimization Strategy

Enhancing Degradation of Low Density Polyethylene Films by Curvularia lunata SG1 Using Particle Swarm Optimization Strategy

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

The Geomicrobiology of Chromium (VI) Pollution: Microbial Diversity and its Bioremediation Potential

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