| In recent years, our government further established the textile industry’s position in the national economy and included it as one of the 10 national key revitalization industries.The textile printing and dyeing industry with high technical requirements and high value-added products is essential to achieve the revitalization of the textile industry. But the textile printing and dyeing industry are high energy consumption, water consumption, sewage and other issues of serious,in order to achieve the vigorous development of industry and escalate technologies, saving energy, descending depletion, saving water and reduction in discharge are the industry’s key and inevitable trend to the revitalization and technology upgrades, which are conducive to the sustainable development of dyeing and printing industry.Reactive dyes is mainly used in the dyeing of cotton fabric in the textile printing and dyeing industry,but it’s Utilization rate is not high and there are lots of problems with the reactive dye bath effluent, such as great quantity , and high levels of COD, color depth, alkaline, large changes in water quality and the high volume of wastewater discharge. So the treatment and reuse of printing and dyeing wastewater has been widely appreciated. Commonly used treatment is separation plus bleaching which is difficult to promote as the complicated process and the high cost of processing. The main purpose of this study subject is recycle reactive dyes effluent not through the complexity of processing, but directly through the adjustment process back to dyeing to ensure the samples dyed with effluent is as same as the samples using the ordinary water as the medium.The dip dyeing processes of acceleration and fixation simultaneously on Reactive blake A, Reactive Red B, Reactive Yellow C and Reactive blue D have been investigated . The results are indicated: dye-uptake of the dye has been improved in comparison with the one by conventional diping dying. This technology simplify the dyeing process, and the contradiction of conventional diping dying and residue reuse dyeing of reactive dye has been resolvedBy continued dyeing with the dyeing effluents, it’s active ingredient has been determined. On this basis, the impact of salt and alkali replenishment on residue recycling dyeing effects has been researched and the dyeing process has been optimized by orthogonal test. Thereby 50～70% of salt and 60～80% of base can been saved. The recycling process of double reactives of reactive dye dip dyeing, repeated recycle of dyeing and 2 or 3-mixed dyes dip dyeing have been researched and the dyeing processes have been optimized.The results showed that the color difference between the sample dyed by method which reusing the dyeing effluents and the initial sample can reached band 4, and the relevant color fastness compared with initial sample. For repeated recycle of dyeing except the color difference of the Reactive blue D 3 to 5 times repeated recycle of dyeing can only reached band 3～4,other dyes can reached band 4.The dyeing effluents Double-reactives of reactive dye and KN- reactive of reactive dye have been analysised by Reversed-PhaseHigh-Performance Liquid Chromatogr- aphy(HPLC). The results of former was differential from the results by continued dyeing with the dyeing effluents,but the results of latter are almost unanimous with the results by Continued dyeing.these Mainly due to complexed hydrolysis process, and multi hydrolyzate of Double-reactives of reactive dye and impurities of comme- rcial dyes which are difficult to separated.This study used the original dyeing equipment, adjusted the dyeing process , utilized dye, salt and alkali of effluent recycling. This approach economized water, reduce the consumption of dyes and chemicals and the cost of production, it’s worthy to popul- arize and be widely applied . |
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