title: Behaviour of different anaerobic populations on the biodegradation of textile chemicals.
abstract: The anaerobic biodegradation of textile chemicals was evaluated with inocula grown under mesophilic (37+/-2 degrees C) or thermophilic (55+/-2 degrees C) conditions, on glucose (glucose-grown) or acetate (acetate-grown) as sole carbon sources. Wool dyebath chemicals (acetic acid, a liposomal surfactant, a synthetic amphoteric surfactant), single or as binary acetate-surfactant mixtures, were used as test carbon sources, in the presence or absence of Acid Orange 7 as model dye. First, the two mesophilic inocula (glucose- or acetate-grown) were compared relatively to lag-phase durations, specific biogas production rates, biogas yields and overall COD removal yields. In some runs, sulphide and/or the model dye were included, to test for inhibition effects. Then, the two glucose-grown inocula (mesophilic and thermophilic) were assessed in batch biodegradation tests with the same carbon feeds. The kinetics for substrate-COD and dye colour removal were described and quantified using a pseudo-first order model. The presence of dye had no effect on performance parameters for all substrates tested. Acetoclastic methanogens seemingly played an important role in biogas production from the liposomal additive, but less so from the synthetic surfactant. The association of acetate and surfactants apparently introduced mutual inhibitory effects on the rates of biogas production, substrate uptake and dye decolourisation.
authors.affiliation: Chemistry Department, Textile and Paper Materials Unit, University of Beira Interior, 6200 Covilhã, Portugal. imscg@ubi.pt
authors.forename: Isolina C
authors.initials: IC
authors.lastname: Gonçalves
authors.forename: Luis
authors.initials: L
authors.lastname: Lopes
authors.forename: Helena M
authors.initials: HM
authors.lastname: Pinheiro
authors.forename: M Isabel A
authors.initials: MI
authors.lastname: Ferra
mesh_terms: D000085:Acetates; D000693:Anaerobiosis; D001391:Azo Compounds / Q000378:metabolism; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001557:Benzenesulfonates / Q000378:metabolism; D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism; D004396:Coloring Agents / Q000378:metabolism*; D007220:Industrial Waste; D007700:Kinetics; D013501:Surface-Active Agents; D013784:Textiles
chemical_list: D000085:Acetates; D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007220:Industrial Waste; D013501:Surface-Active Agents; D002244:Carbon; C014722:2-naphthol orange