Mass Transfer and Equilibria

Selke, W.

doi:10.1016/b978-1-4832-3202-7.50008-0

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…when a # b, but it does not affect the equilibrium when the valence of the exchanging species is the same, i.e. a = b. Consequently, the ion-exchange isotherms of a species in a binary heterovalent system vary in shape depending on the total normality of the solution (Selke, 1956).…”

Section: Equilibrium Modelmentioning

confidence: 99%

Optimizing Cu removal/recovery in a biosorption column

1997

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Abstraet--Biosorption of Cu 2 + by Sargassum fluitans seaweed biomass protonated by an acidic wash or loaded with Ca -'+ is based on ion exchange. The uptake of Cu 2+ is respectively accompanied by a release of either H + or Ca -'+ into the solution phase. The effects of Ca-, H-and H/Ca-cycles on the performance of a continuous-flow biosorption fixed-bed were established. The Ca-cycle applied to Sargassum biomass in a packed bed led to a high degree of a column utilization but did not allow an effective Cu recovery. The H-cycle permitted 100% Cu recovery but also shortened the sorption column service time. The combined Ca/H-cycle was shown to be inefficient due to the time consuming regeneration of biomass from the H-form to the Ca-form. Biomass pretreatment with 1% (w) solution of CaCI2 and with 0.1 M HCI resulted in the same Cu uptake of 75 mg/g. The Ca-pretreated biomass lost approximately 30% of its Cu capacity with subsequent acidic wash. The equilibrium aspects of Cu removal and recovery in a biosorption column were analyzed through the concept of ion-exchange isotherms. The dynamics of Cu sorption and of biomass regeneration in a fixed-bed column was predicted by numerically solving the equations of a proposed ion-exchange model.

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Section: Equilibrium Modelmentioning

confidence: 99%

Optimizing Cu removal/recovery in a biosorption column

1997

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“…The ion exchange isotherms are usually displayed using dimensionless forms of the uptake and concentration and they vary in shape depending on the total normality of the solution (Selke, 1956):…”

Section: Ion-exchange Isothermsmentioning

confidence: 99%

Advances in the biosorption of heavy metals

Kratochvil¹

1998

Trends in Biotechnology

905

388

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SUMMARYBiosorption of heavy metals by various types of non-living (microbial) biomass appears as a very cost-effective new alternative for decontamination of metal bearing effluents. The understanding of metal biosorption mechanisms has progressed to the point where the process is being readied for scale up and field applications. Packed bed sorption columns is perhaps the most efficient equipment for this purpose. Process engineering aspects are examined for successful application of newly discovered biosorption materials which serve as natural and very efficient ion exchangers. Easy regeneration of biosorbents increases the process economy making it possible to reuse them in multiple sorption cycles. Optimization of the sorption/desorption cycles results in metal-free effluents and small volumes of highly concentrated metal desorbing solutions facilitating a conventional follow-up metal recovery.

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“…Fruendlich and Langmuir isotherms and equations have been developed to the point where they can be used to relate certain ion exchange reactions. The most widely used equation is the mass action relationship (Selke, 1956). It can be developed to a very sophisticated degree through the use of fundamental thermo- that results in the equilibrium relationship…”

Section: Exchange Processesmentioning

confidence: 99%

THE DEVELOPMENT OF THEORETICAL EQUATIONS TO DESCRIBE THE FLOW OF A RADIOACTIVE ION IN GROUND WATER. Annual Report, December 1, 1966--November 30, 1967.

Grove¹

1969

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Mass Transfer and Equilibria

Cited by 8 publications

References 27 publications

Optimizing Cu removal/recovery in a biosorption column

Optimizing Cu removal/recovery in a biosorption column

Advances in the biosorption of heavy metals

THE DEVELOPMENT OF THEORETICAL EQUATIONS TO DESCRIBE THE FLOW OF A RADIOACTIVE ION IN GROUND WATER. Annual Report, December 1, 1966--November 30, 1967.

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