文摘
The textile dyeing process consumes large quantities of water which includes huge amounts of colored wastewater. Usually the rinsing of dyed fabric and the treating of the dyeing wastewater are separated. The two independent processes increase the difficulty and the costs of wastewater treatment. In this paper, the laccase/lipopeptide joint rinsing technology was employed to wash dyed fabric and to decolorize the rinsing effluent simultaneously. The effects of the lipopeptide concentration on the decolorization ratio of dye solution, surface tension, and the wetting ability of cotton fabric were investigated. The rinsing conditions were optimized by central composite design of response surface methodology. The results indicated that the color strength (K/S value), color difference, and fastnesses of rinsed samples were close to or better than the conventional and acidic soaping methods. Meanwhile, both the chroma and the chemical oxygen demand C r value of the rinsing effluent produced in the enzyme rinsing process decreased obviously. In addition, the decolorization mechanism was also discussed after ultraviolet-visible and ultra performance liquid chromatograph-mass spectrometry analyses of the degraded dye molecule.