title: Synergistic relationships in algal-bacterial microcosms for the treatment of aromatic pollutants.
abstract: 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.
authors.affiliation: 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.
authors.forename: Xavier
authors.initials: X
authors.lastname: Borde
authors.forename: Benoît
authors.initials: B
authors.lastname: Guieysse
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Delgado
authors.forename: Raúl
authors.initials: R
authors.lastname: Muñoz
authors.forename: Rajni
authors.initials: R
authors.lastname: Hatti-Kaul
authors.forename: Caroline
authors.initials: C
authors.lastname: Nugier-Chauvin
authors.forename: Henri
authors.initials: H
authors.lastname: Patin
authors.forename: Bo
authors.initials: B
authors.lastname: Mattiasson
mesh_terms: 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
chemical_list: D010616:Phenanthrenes; D012459:Salicylates; D019800:Phenol; C031181:phenanthrene