Cadmium(II) adsorption on Cladophora crispata in batch stirred reactors in series

Özer, Ayla; Özer, Dursun; Dursun, Gülbeyi; Bulak, Serpil

doi:10.1016/s0956-053x(99)00082-3

Cited by 24 publications

(11 citation statements)

References 15 publications

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“…In our study, the pattern of Cd removal-with maxima reached very early during exposure, followed by a slight decrease and eventually by a plateau, was consistent with that described by Torres et al (1998). Additionally, the increase observed in total metal removal, as the metal concentrations in the supernatant solution were set higher, was also described elsewhere (Costa and França 1998;Ö zer et al 1999). Except for the lowest Cd concentration (for which the amount of Cd uptaken by the cells overcame the amount adsorbed), the metal was removed by both ecotypes chiefly by adsorption onto the cell surface.…”

Section: Discussionsupporting

confidence: 90%

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Use of the microalga Scenedesmus obliquus to remove cadmium cations from aqueous solutions

Monteiro

Castro

Malcata

2009

World J Microbiol Biotechnol

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The ability of a wild strain of Scenedesmus obliquus, isolated from a heavy metal-contaminated environment, to remove Cd 2? from aqueous solutions was studied at several initial concentrations. Viable biomass removed metal to a maximum extent of 11.4 mg Cd /g at 1 mg Cd /l, with most Cd 2? being adsorbed onto the cell surface. A commercially available strain (ACOI 598) of the same microalga species was also exposed to the same Cd concentrations, and similar results were obtained for the maximum extent of metal removal. Heat-inactivated cells removed a maximum of 6.04 mg Cd /g at 0.5 mg Cd /l. The highest extent of metal removal, analyzed at various pH values, was 0.09 mg Cd /g at pH 7.0. Both strains of the microalga tested have proven effective in removing a toxic heavy metal from aqueous solutions, hence supporting their choice for bioremediation strategies of industrial effluents.

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Section: Discussionsupporting

confidence: 90%

“…The former is a passive event, which is independent of cell metabolism, and is based on physicochemical interactions between metal and functional groups on the cell wall. Conversely, bioaccumulation depends on cell metabolism, and takes place when metal ions are incorporated intracellularly (Ö zer et al 1999;Rangsayatorn et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Use of the microalga Scenedesmus obliquus to remove cadmium cations from aqueous solutions

Monteiro

Castro

Malcata

2009

World J Microbiol Biotechnol

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“…The parameter N is a measure of the affinity between the sorbent and the surface. The forces between the surface layer and the sorbent are attractive if N is less than unity and repulsive if N is greater than unity (Ozer et al, 1999). Freundlich 1/N could be estimated based on the structure of the adsorbent cell surface and the density of carboxyl groups on that surface (Chang et al, 2000).…”

Section: Adsorptionmentioning

confidence: 99%

The removal of uranium from mining waste water using algal/microbial biomass

Kalin¹,

Wheeler²,

Meinrath³

2005

Journal of Environmental Radioactivity

302

134

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We describe a three step process for the removal of uranium (U) from dilute waste waters.Step one involves the sequestration of U on, in, and around aquatic plants such as algae. Cell wall ligands efficiently remove U(VI) from waste water. Growing algae continuously renew the cellular surface area.Step 2 is the removal of U-algal particulates from the water column to the sediments.Step 3 involves reducing U(VI) to U(IV) and transforming the ions into stable precipitates in the sediments. The algal cells provide organic carbon and other nutrients to heterotrophic microbial consortia to maintain the low E H , within which the U is transformed.Among the microorganisms, algae are of predominant interest for the ecological engineer because of their ability to sequester U and because some algae can live under many extreme environments, often in abundance. Algae grow in a wide spectrum of water qualities, from alkaline environments (Chara, Nitella) to acidic mine drainage waste waters (Mougeotia, Ulothrix). If they could be induced to grow in waste waters, they would provide a simple, longterm means to remove U and other radionuclides from U mining effluents. This paper reviews the literature on algal and microbial adsorption, reduction, and transformation of U in waste streams, wetlands, lakes and oceans.

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“…However, a short exposure time (90 min) was selected based on previous information withdrawn from several published studies. It has been described that metal uptake by inactivated microalgal cells is exclusively due to adsorption onto the cell wall surface (Chu and Hashim 2004), a process that should reach equilibrium after a few minutes of contact (Ö zer et al 1999;Tüzün et al 2005); hence, equilibrium was not attained under our conditions, but only at the highest initial concentration experimentally tested, a longer contact time would have been necessary to obtain the maximum level of Zn removal.…”

Section: Adsorption On Dead Cellsmentioning

confidence: 86%

Characterization of Desmodesmus pleiomorphus isolated from a heavy metal-contaminated site: biosorption of zinc

et al. 2009

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Microalgae have been proven efficient biological vectors for heavy metal uptake. In order to further study their biosorption potential, a strain of Desmodesmus pleiomorphus (L) was isolated from a strongly contaminated industrial site in Portugal. Under different initial Zn(2+) concentrations, metal removal by that strain reached a maximum of 360 mg Zn/g biomass after 7 days, at 30 mg Zn/l, after an initial rapid phase of uptake. Comparative studies were carried out using a strain of the same microalgal species that is commercially available (ACOI 561): when exposed to 30 mg Zn/l, it could remove only 81.8 mg Zn/g biomass. Biosorption experiments using inactivated biomass of the isolated strain reached a maximum Zn(2+) uptake of 103.7 mg/g. Metal removal at various initial pH values was studied as well; higher removal was obtained at pH 5.0. The microalga strain L, isolated from the contaminated site, exhibited a much higher removal capacity than the commercial strain, and the living biomass yielded higher levels of metal removal than its inactivated form.

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Cadmium(II) adsorption on Cladophora crispata in batch stirred reactors in series

Cited by 24 publications

References 15 publications

Use of the microalga Scenedesmus obliquus to remove cadmium cations from aqueous solutions

Use of the microalga Scenedesmus obliquus to remove cadmium cations from aqueous solutions

The removal of uranium from mining waste water using algal/microbial biomass

Characterization of Desmodesmus pleiomorphus isolated from a heavy metal-contaminated site: biosorption of zinc

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