Bacterial Biosorption: A Technique for Remediation of Heavy Metals

Ansari, Mohd Ikram; Masood, Farhana; Malik, Abdul

doi:10.1007/978-1-4419-7931-5_12

Cited by 26 publications

(17 citation statements)

References 158 publications

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“…Such property of the EPS can be largely utilized in developing bio-compatible and environment-friendly ion-exchange resins. The remediation of a heavy metal pollutant from refining ores, mines, sludge, paints, pesticides, and other industries can be done using such binding and adsorption properties of complex EPSs ( Ansari, Masood & Malik, 2011 ).…”

Section: Discussionmentioning

confidence: 99%

Expression and characterization of a potential exopolysaccharide from a newly isolated halophilic thermotolerant bacteriaHalomonas nitroreducensstrain WB1

Chikkanna

Ghosh

Kishore

2018

PeerJ

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The halophilic bacterial strain WB1 isolated from a hydrothermal vent was taxonomically characterized using multiple proxies, as Halomonas nitroreducens strain WB1. When grown on malt extract/yeast extract (MY) medium, it produced large quantities of exopolysaccharide (EPS). The polymer was synthesized at a higher rate during the log and early stationary phases. The anionic polysaccharide is primarily composed of glucose, mannose, and galactose. The studied EPS was highly viscous and had pseudoplastic nature. The EPS was found to be a mixture of three polysaccharides under FT-IR, which makes it less labile to environmental diagenesis. It also has emulsifying and antioxidant activity along with the binding capacity to heavy metals. The EPS has unique and interesting physical and chemical properties, which are different from earlier reported exo-polysaccharides produced by different bacterial genus. This suggests that the extreme geological niches like hypersaline, hyperthermal, hypothermal, and oligophilic environments, which are not well studied so far, can offer extensive and potential resources for medical, biotechnological and industrial applications. The study clearly showed that the thermal springs from the temperate region can be a potent source of many such industrially important microbial genera and need further detailed studies to be carried out.

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Section: Discussionmentioning

confidence: 99%

Expression and characterization of a potential exopolysaccharide from a newly isolated halophilic thermotolerant bacteriaHalomonas nitroreducensstrain WB1

Chikkanna

Ghosh

Kishore

2018

PeerJ

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“…Among the heavy metals, lead is one of the hazardous metal causing toxicity to environment and humans (Hu et al, 2020). The main source for lead contamination in water are discharge of wastewater from processing industries, i.e., electroplating, pigment, paint, metal finishing, basic steel work and electric batteries (Ansari et al, 2011). The desirable limit…”

Section: Introductionmentioning

confidence: 99%

Biosorption of lead ions by exopolysaccharide producing Azotobacter sp.

Dhevagi¹,

Priyatharshini²,

Ramya³

et al. 2021

JEB

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Aim: Removal of lead from wastewater using Azotobacter species and optimisation of various parameters to maximise the adsorption of lead by response surface methodology as a tool. Methodology: The bacterial isolate UBI-7 recovered from sewage water irrigated soil was examined for its biosorption potential towards lead. The lead removal efficiency of Azotobacter salinestris was studied with respect to metal concentration (50-250 mg l-1), contact time (24-120 hrs), and pH (4-8).Using response surface methodology, these factors were optimized and R2 value obtained was 0.9710 for lead ions, which indicates the validity of the model. Observation with Fourier Transform Infrared (FTIR), Scanning Electron Microscope imaging (SEM) and Energy Dispersive X-ray Spectroscopic analysis (EDX) were carried out to confirm lead biosorption by Azotobacter salinestris. Results: The lead tolerant bacterium isolated from sewage water irrigated soil (UBI-7) was recognized as Azotobacter salinestris by 16S rRNA based gene sequence analysis. The highest removal percentage of Pb (61.54) was 50 mg l-1 in 72 hrs equilibration period. Interaction effect between different levels of Pb and different contact time of the solution were found to be significant. Lead biosorption by the organism was confirmed by the changes in stretching intensities of functional groups as well as appearance of strong OH stretching at 3291.69 cm-1. Images obtained from Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopic studies of the bacteria (UBI-7) before and after biosorption clearly indicated lead adsorption. Interpretation: Current study proves that the functional groups of Azotobacter salinestris are involved in lead biosorption from aqueous solution which was confirmed through FTIR.EDX analysis also elucidated the lead absorption by the bacterial cells. Hence, this could be effectively utilized for decontamination of lead from the polluted environment. Key words: Azotobacter salinestris, Biosorption, Lead, Response surface methodology

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“…This mechanism presents some advantages over chemical ones, such as lower operation costs, reduction of required chemicals and deposition of produced sludge, and higher efficiency in the detoxification of diluted effluents [20]. Biological processes using non-living biomass arose as an alternative approach due to the fact that metal ions can be retained by biomass through surface precipitation, van der Waals forces, ion-exchange reactions, electrostatic interactions, complexation [21,22,23] or by a combinations of several of these processes [24]. On the other hand, metabolic pathways seem to play an important role when living organisms are used.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Rare Earth Elements from Wastewater Towards a Circular Economy

Barros

Costa

et al. 2019

Molecules

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The use of rare earth elements is a growing trend in diverse industrial activities, leading to the need for eco-friendly approaches to their efficient recovery and reuse. The aim of this work is the development of an environmentally friendly and competitive technology for the recovery of those elements from wastewater. Kinetic and equilibria batch assays were performed with zeolite, with and without bacterial biofilm, to entrap rare earth ions from aqueous solution. Continuous assays were also performed in column setups. Over 90% removal of lanthanum and cerium was achieved using zeolite as sorbent, with and without biofilm, decreasing to 70% and 80%, respectively, when suspended Bacillus cereus was used. Desorption from the zeolite reached over 60%, regardless of the tested conditions. When in continuous flow in columns, the removal yield was similar for all of the rare earth elements tested. Lanthanum and cerium were the elements most easily removed by all tested sorbents when tested in single- or multi-solute solutions, in batch and column assays. Rare earth removal from wastewater in open setups is possible, as well as their recovery by desorption processes, allowing a continuous mode of operation.

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Bacterial Biosorption: A Technique for Remediation of Heavy Metals

Cited by 26 publications

References 158 publications

Expression and characterization of a potential exopolysaccharide from a newly isolated halophilic thermotolerant bacteriaHalomonas nitroreducensstrain WB1

Expression and characterization of a potential exopolysaccharide from a newly isolated halophilic thermotolerant bacteriaHalomonas nitroreducensstrain WB1

Biosorption of lead ions by exopolysaccharide producing Azotobacter sp.

Recovery of Rare Earth Elements from Wastewater Towards a Circular Economy

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