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Optimization of high-molecular-weight polycyclic aromatic hydrocarbons' degradation in a two-liquid-phase bioreactor

Marcoux, José; Déziel, Éric; Villemur, Richard; Lépine, François; Bisaillon, Jean-Guy; Beaudet, Réjean (2000). Optimization of high-molecular-weight polycyclic aromatic hydrocarbons' degradation in a two-liquid-phase bioreactor Journal of Applied Microbiology , vol. 88 , nº 4. p. 655-662. DOI: 10.1046/j.1365-2672.2000.01011.x.

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Résumé

A microbial consortium degrading the high-molecular-weight polycyclic aromatic hydrocarbons (HMW PAHs) pyrene, chrysene, benzo[a]pyrene and perylene in a two-liquid-phase reactor was studied. The highest PAH-degrading activity was observed with silicone oil as the water-immiscible phase; 2,2,4,4,6,8,8-heptamethylnonane, paraffin oil, hexadecane and corn oil were much less, or not efficient in improving PAH degradation by the consortium. Addition of surfactants (Triton X-100, Witconol SN70, Brij 35 and rhamnolipids) or Inipol EAP22 did not promote PAH biodegradation. Rhamnolipids had an inhibitory effect. Addition of salicylate, benzoate, 1- hydroxy-2-naphtoic acid or catechol did not increase the PAH-degrading activity of the consortium, but the addition of low-molecular-weight (LMW) PAHs such as naphthalene and phenanthrene did. In these conditions, the degradation rates were 27mg l-1 d-1 for pyrene, 8.9mg l-1 d-1 for chrysene, 1.8mg l-1 d-1 for benzo[a]pyrene and 0.37mg l-1 d-1 for perylene. Microorganisms from the interface were slightly more effective in degrading PAHs than those from the aqueous phase

Type de document:
Mots-clés libres: benzo[a]pyrene, chrysene, perylene, polycyclic aromatic hydrocarbon, pyrene, surfactant, biodegradation, bioreactor, Zea mays
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 05 mai 2014 15:54
Dernière modification: 05 mai 2014 15:54
URI: http://espace.inrs.ca/id/eprint/2256

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