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Title

Effect of process parameters in laccase mediator system delignification of flax pulp. Part II: Impact on effluents properties

AuthorsFillat, Ursula ; Roncero, M. Blanca
KeywordsBleaching
COD
Color
Effluents
Flax pulp
1-Hydroxybenzotriazole
Laccase
Mathematical model
Oxygen pressure
Residual enzymatic activity
Sequential statistical plan
Toxicity
Issue Date2009
PublisherElsevier
CitationChemical Engineering Journal 152:330-338(2009)
AbstractFlax pulp was bleached by using an enzyme treatment with laccase (L stage) in the presence of HBT as mediator in order to replace chlorine-based pulp bleaching processes which produce toxic organochlorine compounds with biotechnological products, achieving an environmentally friendly process technology. Enzyme treatments were sequentially conducted according to a factorial design involving four variables: laccase dose, HBT dose, treatment time and oxygen pressure in the reactor. Their influence on the effluent properties (COD, color, toxicity, spectra and residual enzymatic activity) was examined to evaluate the impact of L stage on environment since no experimental data have been published concerning this matter. Mathematical models accurately predicting effluent properties in terms of the previous four variables were developed. High COD levels were obtained as a result of using commercial laccase. Also, red color produced, especially at long treatment time, relates to formation of oxidation products from HBT. The residual enzymatic activity depends basically on mediator dose, and mainly activity loss is produced during the first 30 min of treatment. The toxicity of the effluents was below the limits set by the sewage regulations for Catalonia and can be ascribed to the combined effect of the laccase-mediator system.
Description9 páginas, 8 figuras, 7 tablas -- PAGS nros. 330-338
Publisher version (URL)http://dx.doi.org/10.1016/j.cej.2009.05.034
URIhttp://hdl.handle.net/10261/47374
DOI10.1016/j.cej.2009.05.034
ISSN1385-8947
Appears in Collections:(CIB) Artículos
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