Printing and dyeing wastewater separation

With the increasingly stringent environmental protection laws and regulations in my country, the printing and dyeing industry is facing increasing pressure on wastewater treatment. Printing and dyeing wastewater has the characteristics of large water volume, complex composition, high chroma, and high content of organic pollutants. Traditional treatment methods are difficult to meet the needs of modern industry. Therefore, it is imperative to explore efficient printing and dyeing wastewater separation technology. 1. Current status of printing and dyeing wastewater treatment At present, physical, chemical and biological treatment methods are mainly used for printing and dyeing wastewater treatment. Among them, membrane separation technology, as an efficient and environmentally friendly treatment method, has been widely used in printing and dyeing wastewater treatment. 2. Application of nanofiltration membrane technology in printing and dyeing wastewater treatment 1. Nanofiltration membrane separation principle Nanofiltration membrane is a membrane separation technology between reverse osmosis and ultrafiltration, with multiple separation effects such as screening effect and charging effect. The separation pore size of nanofiltration membrane is in the nanometer range, which can effectively remove small molecular organic pollutants such as dyes and slurries in printing and dyeing wastewater. 2. Advantages of nanofiltration membrane technology (1) Pure physical process, no chemical reaction, low energy consumption; (2) Large membrane element filling area, small system footprint, easy to improve and expand technology; (3) Low working pressure, energy saving, large amount of recycled water; (4) The interception rate of high-valent metal ions is as high as 95% or more. 3. Application case of nanofiltration membrane technology in printing and dyeing wastewater treatment Taking a printing and dyeing enterprise as an example, nanofiltration membrane technology is used to treat printing and dyeing wastewater. The quality of the treated wastewater meets the reuse water standard, realizing the recycling of water resources. At the same time, nanofiltration membrane technology has also successfully solved the problems of long process, high consumption, and secondary pollution in traditional treatment methods. III. Conclusion Nanofiltration membrane technology, as an efficient and environmentally friendly printing and dyeing wastewater treatment method, has broad application prospects. In the future treatment of printing and dyeing wastewater, we should increase the research and promotion of nanofiltration membrane technology to contribute to the realization of green and sustainable development of the printing and dyeing industry. At the same time, enterprises should also actively respond to national policies, adopt advanced technologies to reduce wastewater discharge, and protect the ecological environment.