Repeated cadmium biosorption by regeneratedEnterobacter aerogenes biofilm attached to activated carbon

Scott, J. A.; Karanjkar, A. M.

doi:10.1007/bf01021653

Cited by 44 publications

(17 citation statements)

References 3 publications

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Section: Introductionmentioning

confidence: 99%

“…Heavy metal cations have also been shown to in£uence bacterial attachment and detachment interactions [5]. In addition, bacteria attached to surfaces and particulates accumulate heavy metal cations internally and at the cell surface [1,6,7] and, by so doing, may in£uence the distribution of heavy metals between surfaces and the aqueous phase in terrestrial and aquatic systems [6]. Bacteria accumulate heavy metal cations through two processes.…”

Section: Introductionmentioning

confidence: 99%

“…The accumulation of metal cations by bio¢lms of bacteria is higher than that by their free-living counterparts [6,7]. The exopolymer matrix of bio¢lms is the major and possibly dominant site of heavy metal sorption in bio¢lms [7,10]. Exopolysaccharide polymers bind metals highly ef-¢ciently and have been shown to enhance bacterial metal sorption by several orders of magnitude [7,11].…”

Section: Introductionmentioning

confidence: 99%

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The impact of surface attachment on cadmium accumulation by Pseudomonas fluorescens H2

McEldowney

2000

FEMS Microbiology Ecology

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Cadmium accumulation by Pseudomonas fluorescens H2 attached to glass surfaces and by cells free in suspension in maleate buffer was compared and showed several major differences. The time to saturation of cells with Cd(2+) was different for attached and free cells, although both showed biphasic uptake of Cd(2+). The accumulation of Cd(2+) by free cells was inhibited by the presence of zinc but remained several orders of magnitude higher than accumulation by attached cells. The presence of Zn(2+), however, did not inhibit Cd(2+) uptake by cells attached to the solid substratum. Cadmium uptake still increased with Cd(2+) concentration for both free and attached cells in the presence of Zn(2+). The accumulation of Cd(2+) by both free and attached cells increased with pH up to pH 11. The presence of a metabolic inhibitor, carbomyl cyanide m-chlorophenyl-hydrazone, reduced the uptake of Cd(2+) by free cells by 40% but reduced uptake by attached cells by only 25%. Approximately 65% of Cd(2+) accumulated by cells free in suspension was associated with the cell wall, 33% was present in the cytoplasm and only 2% was bound to exopolymer. The results suggest that the characteristics of heavy metal accumulation by bacterial cells are substantially affected by attachment to solid surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The impact of surface attachment on cadmium accumulation by Pseudomonas fluorescens H2

McEldowney

2000

FEMS Microbiology Ecology

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“…The microbial cell walls, which mainly consist of polysaccharides, lipids and proteins, offer many functional groups that can bind heavy metal ions, and these include carboxylate, hydroxyl, amino and phosphate groups [36]. Among various microbe-mediated methods, the biosorption process seems to be more feasible for large scale application compared to the bioaccumulation process, because microbes will require addition of nutrients for their active uptake of heavy metals, which increases the biological oxygen demand or chemical oxygen demand in the waste.…”

Section: Epa Regulatorymentioning

confidence: 99%

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

et al. 2015

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Heavy metals are natural constituents of the environment, but indiscriminate use for human purposes has altered their geochemical cycles and biochemical balance. This results in excess release of heavy metals such as cadmium, copper, lead, nickel, zinc etc. into natural resources like the soil and aquatic environments. Prolonged exposure and higher accumulation of such heavy metals can have deleterious health effects on human life and aquatic biota. The role of microorganisms and plants in biotransformation of heavy metals into nontoxic forms is well-documented, and understanding the molecular mechanism of metal accumulation has numerous biotechnological implications for bioremediation of OPEN ACCESSSustainability 2015, 7 2190 metal-contaminated sites. In view of this, the present review investigates the abilities of microorganisms and plants in terms of tolerance and degradation of heavy metals. Also, advances in bioremediation technologies and strategies to explore these immense and valuable biological resources for bioremediation are discussed. An assessment of the current status of technology deployment and suggestions for future bioremediation research has also been included. Finally, there is a discussion of the genetic and molecular basis of metal tolerance in microbes, with special reference to the genomics of heavy metal accumulator plants and the identification of functional genes involved in tolerance and detoxification.

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“…Hence, the biomass is to be immobilized before being subjected to biosorption. The principal techniques available for application of biosorption are based on (i) adsorption on inert supports e.g., activated carbon was used as a support for Enterobacter aerogens biofilm (Scott and Karanjakar, 1992;Wei-Bin et al, 2006); (ii) entrapment in polymeric matrix e.g., polymers used were calcium alginate (Costa and Leite, 1991;Peng and Koon, 1993), polyacrylamide (Macaskie et al, 1987;Michel et al, 1986;Takehiko, 2004;Wong and Kwok, 1992) polysulfone (Sudha and Abraham, 2003;Vijayaraghavan and Yeoung-Sang, 2007) and polyethylenimine (Wilke et al, 2006); (iii) covalent bonds to vector compounds (Holan et al, 1993;Mahan and Holocombe, 1992); (iv) cell cross-linking (Holan et al, 1993).However, the last two techniques are majorly employed for algal immobilization. Table 3 gives examples of various immobilization matrices used for the study of metal adsorption.…”

Section: Immobilization Of Biomassmentioning

confidence: 99%

Biosorption: An eco-friendly alternative for heavy metal removal

Hima¹,

Srinivasa²,

Vijaya³

et al. 2007

Afr. J. Biotechnol.

177

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Heavy metals occur in immobilized form in sediments and as ores in nature. However due to various human activities like ore mining and industrial processes the natural biogeochemical cycles are disrupted causing increased deposition of heavy metals in terrestrial and aquatic environment. Release of these pollutants without proper treatment poses a significant threat to both environment and public health, as they are non biodegradable and persistent. Through a process of biomagnification, they further accumulate in food chains. Thus their treatment becomes inevitable and in this endeavor, biosorption seems to be a promising alternative for treating metal contaminated waters. This technology employs various types of biomass as source to trap heavy metals in contaminated waters. The biosorbent is prepared by subjecting biomass to various processes like pretreatment, granulation and immobilization, finally resulting in metal entrapped in bead like structures. These beads are stripped of metal ions by desorption which can be recycled and reused for subsequent cycles. This technology out-performs its predecessors not only due to its cost effectiveness but also in being ecofriendly i.e., where other alternatives fail.

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Repeated cadmium biosorption by regeneratedEnterobacter aerogenes biofilm attached to activated carbon

Cited by 44 publications

References 3 publications

The impact of surface attachment on cadmium accumulation by Pseudomonas fluorescens H2

The impact of surface attachment on cadmium accumulation by Pseudomonas fluorescens H2

Bioremediation of Heavy Metals from Soil and Aquatic Environment: An Overview of Principles and Criteria of Fundamental Processes

Biosorption: An eco-friendly alternative for heavy metal removal

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