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Algal-bacterial processes for the treatment of hazardous contaminants: A review

Munoz, Raul LU and Guieysse, Benoit LU (2006) In Water Research 40(15). p.2799-2815
Abstract
Microalgae enhance the removal of nutrients, organic contaminants, heavy metals, and pathogens from domestic wastewater and furnish an interesting raw material for the production of high-value chemicals (algae metabolites) or biogas. Photosynthetic oxygen production also reduces the need for external aeration, which is especially advantageous for the treatment of hazardous pollutants that must be biodegraded aerobically but might volatilize during mechanical aeration. Recent studies have therefore shown that when proper methods for algal selection and cultivation are used, it is possible to use microalgae to produce the 02 required by acclimatized bacteria to biodegrade hazardous pollutants such as polycyclic aromatic hydrocarbons,... (More)
Microalgae enhance the removal of nutrients, organic contaminants, heavy metals, and pathogens from domestic wastewater and furnish an interesting raw material for the production of high-value chemicals (algae metabolites) or biogas. Photosynthetic oxygen production also reduces the need for external aeration, which is especially advantageous for the treatment of hazardous pollutants that must be biodegraded aerobically but might volatilize during mechanical aeration. Recent studies have therefore shown that when proper methods for algal selection and cultivation are used, it is possible to use microalgae to produce the 02 required by acclimatized bacteria to biodegrade hazardous pollutants such as polycyclic aromatic hydrocarbons, phenolics, and organic solvents. Well-mixed photobioreactors with algal biomass recirculation are recommended to protect the microalgae from effluent toxicity and optimize light utilization efficiency. The optimum biomass concentration to maintain in the system depends mainly on the light intensity and the reactor configuration: At low light intensity the biomass concentration should be optimized to avoid mutual shading and dark respiration whereas at high light intensity, a high biomass concentration can be useful to protect microalgae from light inhibition and optimize the light/dark cycle frequency. Photobioreactors can be designed as open (stabilization ponds or high rate algal ponds) or enclosed (tubular, flat plate) systems. The latter are generally costly to construct and operate but more efficient than open systems. The best configuration to select will depend on factors such as process safety, land cost, and biomass use. Biomass harvest remains a limitation but recent progresses have been made in the selection of flocculating strains, the application of bioflocculants, or the use of immobilized biomass systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
photobioreactors, organic pollutants, microalgae, heavy metals, industrial wastewater, photosynthesis
in
Water Research
volume
40
issue
15
pages
2799 - 2815
publisher
Elsevier
external identifiers
  • wos:000240305800002
  • scopus:33746605638
ISSN
1879-2448
DOI
10.1016/j.watres.2006.06.011
language
English
LU publication?
yes
id
f46c94ed-0120-479c-b3fb-1bbd0bfd1de9 (old id 394302)
date added to LUP
2007-10-10 22:58:11
date last changed
2018-07-08 04:00:21
@article{f46c94ed-0120-479c-b3fb-1bbd0bfd1de9,
  abstract     = {Microalgae enhance the removal of nutrients, organic contaminants, heavy metals, and pathogens from domestic wastewater and furnish an interesting raw material for the production of high-value chemicals (algae metabolites) or biogas. Photosynthetic oxygen production also reduces the need for external aeration, which is especially advantageous for the treatment of hazardous pollutants that must be biodegraded aerobically but might volatilize during mechanical aeration. Recent studies have therefore shown that when proper methods for algal selection and cultivation are used, it is possible to use microalgae to produce the 02 required by acclimatized bacteria to biodegrade hazardous pollutants such as polycyclic aromatic hydrocarbons, phenolics, and organic solvents. Well-mixed photobioreactors with algal biomass recirculation are recommended to protect the microalgae from effluent toxicity and optimize light utilization efficiency. The optimum biomass concentration to maintain in the system depends mainly on the light intensity and the reactor configuration: At low light intensity the biomass concentration should be optimized to avoid mutual shading and dark respiration whereas at high light intensity, a high biomass concentration can be useful to protect microalgae from light inhibition and optimize the light/dark cycle frequency. Photobioreactors can be designed as open (stabilization ponds or high rate algal ponds) or enclosed (tubular, flat plate) systems. The latter are generally costly to construct and operate but more efficient than open systems. The best configuration to select will depend on factors such as process safety, land cost, and biomass use. Biomass harvest remains a limitation but recent progresses have been made in the selection of flocculating strains, the application of bioflocculants, or the use of immobilized biomass systems.},
  author       = {Munoz, Raul and Guieysse, Benoit},
  issn         = {1879-2448},
  keyword      = {photobioreactors,organic pollutants,microalgae,heavy metals,industrial wastewater,photosynthesis},
  language     = {eng},
  number       = {15},
  pages        = {2799--2815},
  publisher    = {Elsevier},
  series       = {Water Research},
  title        = {Algal-bacterial processes for the treatment of hazardous contaminants: A review},
  url          = {http://dx.doi.org/10.1016/j.watres.2006.06.011},
  volume       = {40},
  year         = {2006},
}