Decolorisation of reactive dye wastewater and the effect of surfactants using laccase

Abstract

Laccase (benzenediol, oxidoreducase; Enzyme Commission Number) is a multi‐copper oxidase from biomass. Laccase enzyme recycling on molecular oxygen as an electron acceptor can be applied for the decolorisation of synthetic dyes. The decolorisation of 49 commercial reactive dyes using laccase was investigated. The effects of diverse structure surfactants on decolorisation are discussed. The absorption spectra of reactive dyes after a laccase biodegradable reaction were analysed. Reactive dyes based on anthraquinone and azo structures could be decolorised using the enzyme and their chemical structures broken. Reactive dyes based on an anthraquinone structure were easier to decolorise than those based on an azo structure. Surfactants could affect the decolorisation of dyes with an enzyme. The effect of nonionic surfactant on the decolorisation of anthraquinone dyes was the reverse. The cationic surfactant could improve the decolorisation rate of diazo dye. The effect of the anionic surfactant on dye decolorisation was small. Most commercial reactive dyes could be decolorised and biodegraded using a laccase enzyme under mild conditions. Laccase enzyme biotechnology has potential applications in the decolorisation of reactive dye wastewater.

Study of adsorption and desorption performance of acid dyes on anion exchange membrane

“…Moreover, direct discharge of such effluents can contaminate the soil and groundwater. Accordingly, various methods have been investigated to deal with dye-containing wastewater, such as biological techniques [2,3], ultrasonication [4], active carbon adsorption [5], ozone treatment [6], coagulation [7], ion exchange resin [8,9] and ion exchange membrane adsorption methods [10,11].…”

A numerical method of analyzing the composition of colored wastewater from dyeing plant

“…Their disadvantage is the selectivity, i.e., efficacy relative to the specific types of dyes. In the case of other dyes, they are not very effective (Hou and Zhang 2011;Beltran-Heredia and Martin 2008;Li and Guthrie 2010). Therefore, treatment methods of colored wastewater should be individualized and appropriate to the type or the chemical structure of the dye.…”

One‐step dyeing of polyethylene terephthalate fabric, combining pretreatment and dyeing using alkali‐stable disperse dyes

“…Conventional dyeing of textile fabrics is generally performed in a water medium, which results in a high consumption of both water and energy . In order to reduce cost and improve production efficiency, dyeing and finishing factories are seeking more energy‐efficient, environmentally friendly, effective dyeing methods . In the dyeing of polyethylene terephthalate (PET) fabric with disperse dyes, wet processing has three steps: desizing in alkali conditions, dyeing in a weak acidic medium and then reduction clearing in a strong reduction bath, usually made up of sodium hydrosulfite and caustic soda .…”