title: Reductive decolourisation of azo dyes by mesophilic and thermophilic methanogenic consortia.
abstract: The contribution of acidogenic bacteria and methanogenic archaea on the reductive decolourisation of azo dyes was assessed in anaerobic granular sludge. Acidogenic bacteria appeared to play an important role in the decolourising processes when glucose was provided as an electron donor; whereas methanogenic archaea showed a minor role when this substrate was supplemented in excess. In the presence of the methanogenic substrates acetate, methanol, hydrogen and formate, methane production became important only after colour was totally removed from the batch assays. This retardation in methane production may be due to either a toxic effect imposed by the azo dyes or to the competitive behaviour of azo dyes to the methanogenic consortia for the available reducing equivalents.
authors.affiliation: Departamento de Ciencias del Agua y del Medio Ambiente, Instituto Tecnológico de Sonora, 5 de Febrero 818 Sur, Cd. Obregón, Sonora, 85000 Mexico. fcervantes@itson.mx
authors.forename: F J
authors.initials: FJ
authors.lastname: Cervantes
authors.forename: A B
authors.initials: AB
authors.lastname: dos Santos
authors.forename: M P
authors.initials: MP
authors.lastname: de Madrid
authors.forename: A J M
authors.initials: AJ
authors.lastname: Stams
authors.forename: J B
authors.initials: JB
authors.lastname: van Lier
mesh_terms: D017738:Alkanesulfonic Acids / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001391:Azo Compounds / Q000378:metabolism*; D001421:Bacteria, Anaerobic / Q000187:drug effects / Q000378:metabolism*; D003116:Color; D004396:Coloring Agents / Q000378:metabolism*; D019605:Euryarchaeota / Q000187:drug effects / Q000378:metabolism*; D005232:Fatty Acids, Volatile / Q000378:metabolism; D008697:Methane / Q000378:metabolism; D009282:Naphthalenesulfonates / Q000378:metabolism; D010084:Oxidation-Reduction; D012722:Sewage / Q000382:microbiology; D014227:Triazines / Q000378:metabolism; D014640:Vancomycin / Q000494:pharmacology; D018508:Water Purification / Q000379:methods
chemical_list: D017738:Alkanesulfonic Acids; D000900:Anti-Bacterial Agents; D001391:Azo Compounds; D004396:Coloring Agents; D005232:Fatty Acids, Volatile; D009282:Naphthalenesulfonates; D012722:Sewage; D014227:Triazines; C098610:reactive red 2; C053575:reactive orange 14; C070343:Procion Reactive Red 4; C018853:2-bromoethanesulfonic acid; D014640:Vancomycin; D008697:Methane