title: Enzymatic decolorization of spent textile dyeing baths composed by mixtures of synthetic dyes and additives.
abstract: The effects of different components of real dyeing bath formulations, such as the equalizing and fixing additives-acids, salts, and surfactants-on the decolorization catalyzed by Funalia trogii enzymatic extracts, were investigated to understand their influence on the recalcitrance to biodegradation of this type of wastewater. The decolorization of selected dyes and dye mixtures after tissue dyeing was performed in the presence/absence of auxiliary compounds. All spent dyeing baths were enzymatically decolorized to different extents, by the addition of extracts containing laccase only or laccase plus cellobiose dehydrogenase. Whereas surfactant auxiliaries, in some instances, inhibit the decolorization of spent dyeing baths, in several occurrences the acid/salt additives favor the enzymatic process. In general, the complete spent dyeing formulations are better degraded than those containing the dyes only. The comparison of extracellular extracts obtained from spent straws from the commercial growth of Pleurotus sp. mushrooms with those from F. trogii reveals similar decolorization extents thus allowing to further reduce the costs of bioremediation.
authors.affiliation: Dipartimento di Chimica, Università degli Studi di Firenze, Via Della Lastruccia 3, 50019, Florence, Italy.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Ciullini
authors.forename: Antonella
authors.initials: A
authors.lastname: Gullotto
authors.forename: Silvia
authors.initials: S
authors.lastname: Tilli
authors.forename: Giovanni
authors.initials: G
authors.lastname: Sannia
authors.forename: Riccardo
authors.initials: R
authors.lastname: Basosi
authors.forename: Andrea
authors.initials: A
authors.lastname: Scozzafava
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Briganti
mesh_terms: D001673:Biodegradation, Environmental; D004396:Coloring Agents / Q000138:chemical synthesis / Q000378:metabolism*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005656:Fungal Proteins / Q000737:chemistry / Q000378:metabolism*; D020072:Polyporales / Q000201:enzymology* / Q000378:metabolism; D013784:Textiles / Q000032:analysis; D062065:Wastewater / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D005656:Fungal Proteins; D062065:Wastewater