Bioaccumulation of Cr(III) ions by Blue Green-alga Spirulina sp. Part II. Mathematical Modeling

Abstract

In the present paper bioaccumulation of Cr(III) ions by blue-green algae Spirulina sp. is discussed. We found that the process consisted of two stages: passive in which Cr(III) ions are bound to the surface of cells, identical with biosorption and active, metabolism-dependent, in which Cr(III) ions are transported into the cellular interior. The passive stage occurs in both living and non-living cells and the active -only in living biomass. Two distinctive mathematical models of the process were proposed. The first was physical model basing on the identified mechanism of the process. In the second model, artificial neural networks were proposed.

Biosorption of Strontium from Simulated Nuclear Wastewater by Scenedesmus spinosus under Culture Conditions: Adsorption and Bioaccumulation Processes and Models

“…This is different from the mathematical kinetics model proposed by Chojnacka and Wojciechowski [3] (Equation (17)). Their model shows that the free ions affected the bioaccumulation through the c pas , meaning that metal ions first bonded to cell wall and were then transported into the cytoplasm.…”

“…The pseudo-second-order model was well suited for description of the total ion concentration change kinetics, and the equilibrium models were suitable for the description of the cell wall adsorption quantity. There are only a few models describing bioaccumulation in the literature [ 3 ]. A two-step bioaccumulation process was proposed that afforded a quick binding of metal ions to the cell walls, followed by a slower transport process through the cell membrane [ 3 ].…”

“…There are only a few models describing bioaccumulation in the literature [ 3 ]. A two-step bioaccumulation process was proposed that afforded a quick binding of metal ions to the cell walls, followed by a slower transport process through the cell membrane [ 3 ].…”

“…The former is a metabolism-independent process, while the latter is metabolism-dependent [ 1 , 2 ]. The majority of studies on the bioaccumulation of heavy metal ions by microorganisms only consider the final concentration of metal ions, and only a few studies provide quantitative kinetic descriptions of the process and investigate its mechanisms [ 3 ]. Thus, the investigation of adsorption and bioaccumulation processes and their mechanisms can facilitate application of these techniques in wastewater treatment or other associated fields.…”

Performance of aquatic plant species for phytoremediation of arsenic-contaminated water

“…Studies have revealed the mechanism of metal uptake by algae species like blue-green algae Spirulina sp. is chemisorption (chemical adsorption) of metals like chromium and copper other than physical adsorption (Chojnacka and Wojciechowski 2007). Species like Ranunculus trichophyllus, Ranunculus peltatus, Lemna minor, Azolla caroliniana have the potential to serve as arsenic indicators (Favas et al 2012).…”