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Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium

Munoz, Raul LU ; Alvarez Aliaga, Teresa LU ; Munoz, A ; Terrazas, Enrique LU ; Guieysse, Benoit LU and Mattiasson, Bo LU (2006) In Chemosphere 63(6). p.903-911
Abstract
The residual algal-bacterial biomass from photosynthetically supported, organic pollutant biodegradation processes, in enclosed photobioreactors, was tested for its ability to accumulate Cu(II), Ni(II), Cd(II), and Zn(II). Salicylate was chosen as a model contaminant. The algal-bacterial biomass combined the high adsorption capacity of microalgae with the low cost of the residual biomass, which makes it an attractive biosorbent for environmental applications. Cu(II) was preferentially taken-up from the medium when the metals were present both separately and in combination. There was no observed competition for adsorption sites, which suggested that Cu(II), Ni(II), Cd(II), and Zn(II) bind to different sites and that active Ni(II), Cd(II)... (More)
The residual algal-bacterial biomass from photosynthetically supported, organic pollutant biodegradation processes, in enclosed photobioreactors, was tested for its ability to accumulate Cu(II), Ni(II), Cd(II), and Zn(II). Salicylate was chosen as a model contaminant. The algal-bacterial biomass combined the high adsorption capacity of microalgae with the low cost of the residual biomass, which makes it an attractive biosorbent for environmental applications. Cu(II) was preferentially taken-up from the medium when the metals were present both separately and in combination. There was no observed competition for adsorption sites, which suggested that Cu(II), Ni(II), Cd(II), and Zn(II) bind to different sites and that active Ni(II), Cd(II) and Zn(II) binding groups were present at very low concentrations. Therefore, special focus was given to Cu(II) biosorption. Cu(II) biosorption by the algal-bacterial biomass was characterized by an initial fast cell surface adsorption followed by a slower metabolically driven uptake. pH, Cu(II), and algal-bacterial concentration significantly affected the biosorption capacity for Cu(II). Maximum Cu(II) adsorption capacities of 8.5 +/- 0.4 mg g(-1) were achieved at an initial Cu(II) concentration of 20 mg l(-1) and at pH 5 for the tested algal-bacterial biomass. These are consistent with values reported for other microbial sorbents under similar conditions. The desorption of Cu(II) from saturated biomass was feasible by elution with a 0.0125 M HCl solution. Simultaneous Cu(II) and salicylate removal in a continuous stirred tank photobioreactor was not feasible due to the high toxicity of Cu(H) towards the microbial culture. The introduction of an adsorption column, packed with the algal-bacterial biomass, prior to the photobioreactor reduced Cu(II) concentration, thereby allowing the subsequent salicylate biodegradation in the photobioreactor. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
photobioreactors, heavy metals, biosorption, algal-bacterial symbiosis, biodegradation
in
Chemosphere
volume
63
issue
6
pages
903 - 911
publisher
Elsevier
external identifiers
  • wos:000237882300002
  • scopus:33646089196
ISSN
1879-1298
DOI
10.1016/j.chemosphere.2005.09.062
language
English
LU publication?
yes
id
d45b0553-a4cb-46bf-924a-83d086c9061e (old id 408412)
date added to LUP
2016-04-01 11:54:55
date last changed
2020-03-11 02:39:15
@article{d45b0553-a4cb-46bf-924a-83d086c9061e,
  abstract     = {The residual algal-bacterial biomass from photosynthetically supported, organic pollutant biodegradation processes, in enclosed photobioreactors, was tested for its ability to accumulate Cu(II), Ni(II), Cd(II), and Zn(II). Salicylate was chosen as a model contaminant. The algal-bacterial biomass combined the high adsorption capacity of microalgae with the low cost of the residual biomass, which makes it an attractive biosorbent for environmental applications. Cu(II) was preferentially taken-up from the medium when the metals were present both separately and in combination. There was no observed competition for adsorption sites, which suggested that Cu(II), Ni(II), Cd(II), and Zn(II) bind to different sites and that active Ni(II), Cd(II) and Zn(II) binding groups were present at very low concentrations. Therefore, special focus was given to Cu(II) biosorption. Cu(II) biosorption by the algal-bacterial biomass was characterized by an initial fast cell surface adsorption followed by a slower metabolically driven uptake. pH, Cu(II), and algal-bacterial concentration significantly affected the biosorption capacity for Cu(II). Maximum Cu(II) adsorption capacities of 8.5 +/- 0.4 mg g(-1) were achieved at an initial Cu(II) concentration of 20 mg l(-1) and at pH 5 for the tested algal-bacterial biomass. These are consistent with values reported for other microbial sorbents under similar conditions. The desorption of Cu(II) from saturated biomass was feasible by elution with a 0.0125 M HCl solution. Simultaneous Cu(II) and salicylate removal in a continuous stirred tank photobioreactor was not feasible due to the high toxicity of Cu(H) towards the microbial culture. The introduction of an adsorption column, packed with the algal-bacterial biomass, prior to the photobioreactor reduced Cu(II) concentration, thereby allowing the subsequent salicylate biodegradation in the photobioreactor.},
  author       = {Munoz, Raul and Alvarez Aliaga, Teresa and Munoz, A and Terrazas, Enrique and Guieysse, Benoit and Mattiasson, Bo},
  issn         = {1879-1298},
  language     = {eng},
  number       = {6},
  pages        = {903--911},
  publisher    = {Elsevier},
  series       = {Chemosphere},
  title        = {Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium},
  url          = {http://dx.doi.org/10.1016/j.chemosphere.2005.09.062},
  doi          = {10.1016/j.chemosphere.2005.09.062},
  volume       = {63},
  year         = {2006},
}