印染废水生物降解性差，脱色困难，印染废水的脱色效果是评价废水处理方法是否有效的关键指标之一。常用的处理途径是絮凝再絮凝，生化再生化的消极处理方法，工程占地面积大、流程长、基建和运行费用高、处理效果不稳定，由于目前的染色介质以水为主，所以绝大部分染料均易溶于水，而且由于染料分子质量较大，多数染料在水中都能形成亲水性胶体，使得印染废水的常规脱色变得非常困难，因此，需要采取更加经济有效的脱色方法和去除难生化降解有机物的印染废水处理技术。
The biodegradability of printing and dyeing wastewater is poor and decolorization is difficult. The decolorization effect of printing and dyeing wastewater is one of the key indicators to evaluate the effectiveness of wastewater treatment methods. The commonly used treatment methods are flocculation, flocculation and biochemical regeneration. The project covers a large area, the process is long, the cost of capital construction and operation is high, and the treatment effect is unstable. Because the current dyeing medium is mainly water, most dyes are easily soluble in water, and because the molecular weight of dyes is large, most of them are water-soluble. Dyes can form hydrophilic colloids in water, which makes the conventional decolorization of printing and dyeing wastewater very difficult. Therefore, it is necessary to adopt more economical and effective decolorization methods and treatment technology of printing and dyeing wastewater to remove biodegradable organic matter.