Synergistic relationships in algal-bacterial microcosms for the treatment of aromatic pollutants.
The potential of algal-bacterial microcosms was studied for the biodegradation of salicylate, phenol and phenanthrene. The isolation and characterization of aerobic bacterial strains capable of mineralizing each pollutant were first conducted. Ralstonia basilensis was isolated for salicylate degradation, Acinetobacter haemolyticus for phenol and Pseudomonas migulae and Sphingomonas yanoikuyae for phenanthrene. The green alga Chlorella sorokiniana was then cultivated in the presence of the pollutants at different concentrations, showing increasing inhibitory effects in the following order: salicylate < phenol < phenanthrene. The synergistic relationships in the algal-bacterial microcosms were clearly demonstrated, since for the three contaminants tested, a substantial removal (>85%) was recorded only in the systems inoculated with both algae and bacteria and incubated under continuous lighting. This study presents, to our knowledge, the first reported case of photosynthesis-enhanced biodegradation of toxic aromatic pollutants by algal-bacterial microcosms in a one-stage treatment.
Borde
Xavier
X
Laboratoire de Chimie des Biomolécules et des Systèmes Organisés, CNRS UMR 6052, Ecole Nationale Supérieure de Chimie de Rennes, Avenue du Général Leclerc, F-35700 Rennes, France.
Guieysse
Benoît
B
Delgado
Osvaldo
O
Muñoz
Raúl
R
Hatti-Kaul
Rajni
R
Nugier-Chauvin
Caroline
C
Patin
Henri
H
Mattiasson
Bo
B
D000150:Acinetobacter; D001673:Biodegradation, Environmental; D000460:Chlorophyta; D017753:Ecosystem; D016946:Gram-Negative Aerobic Rods and Cocci; D010616:Phenanthrenes / Q000378:metabolism*; D019800:Phenol / Q000378:metabolism*; D010788:Photosynthesis; D011157:Population Dynamics; D011549:Pseudomonas; D012459:Salicylates / Q000378:metabolism*; D020578:Sphingomonas
D010616:Phenanthrenes; D012459:Salicylates; D019800:Phenol; C031181:phenanthrene