Characterization of metal removal of immobilized Bacillus strain CR-7 biomass from aqueous solutions

Xu, Jing; Song, Xian-Chong; Zhang, Qian; Pan, Hong; Liang, Yu; Fan, Xian‐Wei; Li, Youzhi

doi:10.1016/j.jhazmat.2011.01.047

Cited by 28 publications

(10 citation statements)

References 41 publications

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“…cells [33], especially when there is a mixture of metals in the solution [34]. In order to further understand the genetic response of this strain to the presence of heavy metals, and even more, the molecular mechanisms involved in its metal removal capacity, current molecular biology experiments are being performed to elucidate the importance of the genes reported in the present study for Ni and V removal, and to identify other genes whose expression may show evident induction in the presence of these metals, and whose function may be relevant for metal uptake.…”

Section: Discussionmentioning

confidence: 99%

Expression Analysis of Ni- and V-Associated Resistance Genes in a Bacillus megaterium Strain Isolated from a Mining Site

et al. 2016

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Bacillus megaterium strain MNSH1-9K-1 was isolated from a mining site in Guanajuato, Mexico. This B. megaterium strain presented the ability to remove Ni and V from a spent catalyst. Also, its associated metal resistance genes nccA, hant, VAN2, and smtAB were previously identified by a PCR approach. The present study reports for the first time, in B. megaterium, the changes in the expression of the genes nccA (Ni-Co-Cd resistance); hant (high-affinity nickel transporter); smtAB, a metal-binding protein gene; and VAN2 (V resistance) after exposure to 200 ppm of Ni and 200 ppm of V during the stationary phase of the microorganism in PHGII liquid media. The data presented here may contribute to the knowledge of the genes involved in the Ni and V resistances of B. megaterium, and the possible pathways implicated in the Ni-V removal processes, which may be potentiated for the biological treatment of high metal content residues.

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Section: Discussionmentioning

confidence: 99%

Expression Analysis of Ni- and V-Associated Resistance Genes in a Bacillus megaterium Strain Isolated from a Mining Site

et al. 2016

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“…57, No. 3 (2017) Although Bacillus biomass has been used for removal of heavy metal from aqueous solution, the researches on heavy metal removal by immobilized Bacillus biomass from the solutions were very limited (Xu et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Bioremediation Efficiency of Heavy Metals and Azo Dyes by Individual or Consortium Bacterial Species Either as Free orImmobilized Cells: A Comparative Study

Allam

2017

Egypt. J. Bot.

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THE OBJECTIVE of the present study was to compare between free and immbolized bacterial cultuer/s in bioremediation of heavy metals and dyes to reduce environmental pollutants with the help of biological entities. The bacterial consortium consisting of Sphingomonas paucimobilis, Rhizobium radiobacter, and Bacillus subtilis was developed due to capabilities of the three bacterial species to remove heavy metals from industrial waste water and decolorize methyl orange and Congo red textile azo dyes than their corresponding single cultures. The immobilization of bacterial consortium on Ca-alginate increased its heavy metals removal efficiency more than 10% compared to consortium of free cells after 4 days. Also, decolorization ability of immobilized consortium was conducted for shorter time and higher concentrations of dyes than that of free one. The greater efficiency of immobilized consortium than free single culture may be correlated to synergistic activity of different metabolites of bacterial cultures and protection of cells from toxic pollutants that provided by Ca-alginate matrices which promoting an efficient bio-treatment of industrial effluents containing dyes and heavy metals.

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“…However, application of free bacterial cells at industrial scale is disadvantageous due to the difficulty of biomass/effluent separation [9] etc., which may be overcome by using immobilized bacterial cells with the advantages of stability, regeneration, solid-liquid separation and minimal clogging in continuous systems [10]. Immobilization of microorganisms in a suitable matrix like polyvinyl alcohol, agar media and sol-gel materials has been proven to be an efficient solution to this problem [11,12].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Biosorption in Liquid Solid Fluidized Bed by Immobilized Consortia in Alginate Beads

Ilamathi¹,

Nirmala²

2013

J Bioprocess Biotech

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The adsorptive removal chromium, nickel, copper and cadmium by alginate beads containing a mixed consortium of Yeast, Pseudomonas aeruginosa, Bacillus subtilis and Escherichia coli in batch and fluidized bed column reactor was investigated. Under optimized conditions (pH 4.5; contact time 3hrs; initial metal concentration of 150mg/L) batch experiments showed that the immobilized mixed culture was successfully used for the removal of these metal ions in waste water. Fluidized bed studies were carried out in with an adsorbent dosage of 1g/L, a flow rate of 132 LPH, a bed height of length of the reactor. Efficiency of biosorption for copper, cadmium, chromium and nickel was found to be 84.62%, 67.17%, 49.25% and 61.02%. Desorption of the exhausted beads was found to be successful, however with a reduced biosorption capacity.

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Characterization of metal removal of immobilized Bacillus strain CR-7 biomass from aqueous solutions

Cited by 28 publications

References 41 publications

Expression Analysis of Ni- and V-Associated Resistance Genes in a Bacillus megaterium Strain Isolated from a Mining Site

Expression Analysis of Ni- and V-Associated Resistance Genes in a Bacillus megaterium Strain Isolated from a Mining Site

Bioremediation Efficiency of Heavy Metals and Azo Dyes by Individual or Consortium Bacterial Species Either as Free orImmobilized Cells: A Comparative Study

Heavy Metals Biosorption in Liquid Solid Fluidized Bed by Immobilized Consortia in Alginate Beads

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