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It is widely assumed that clean water is becoming a scarce resource. In order to alleviate the water crisis and reduce environmental pollution, countries around the world have taken positive and effective measures, and textile waste water reuse is one of the important initiatives. Textile wastewater recycling is a significant method of waste resource recovery. Not only can it reduce pollution, but it can also increase the amount of usable water resources, with obvious economic, social, and environmental benefits. It is of great importance in today's severe water shortage. However, currently, most of the water after wastewater treatment does not have a high dyeing effect, resulting in dyed fabrics that do not always meet the established quality standards. There’s little research on the best dyeing conditions for reused water. As a result, we conduct a more in-depth examination of the wastewater generated during the printing and dyeing processes. First, different concentrations of NaCl and surfactant were added to simulate the printing and dyeing wastewater treated with AOPs (electrochemical treatment). The water was used in the washing process of four reactive dyes dyed in cotton fabrics (PB,PC,RB,Trichromic). The effects of different salt and surfactant concentrations in reuse water on the dyeing effect were investigated in order to determine the optimal salt and surfactant concentrations in reuse water. After the work, we found that in order to get the standard sample with color difference less than 1, we need to control the concentration of NaCl in the reuse wastewater of PB dye within 80g/L and the concentration of surfactant within 0.1g/L. For the PC dye, the proper concentration of the effluents is NaCl ≤ 8g/L, surfactant≤ 0.1g/L. For the black dye, the concentration of NaCl should be controlled below 100g/L and the concentration of surfactant should be controlled within 0.1g/L.Besides, the concentration of NaCl should be less than 20g/L, and the concentration of surfactant should be controlled within 1g/L in trichromic dye |
