Printing and dyeing wastewater discharge capacity is larger, the recovery rate of less than 10%, and membrane separation technology has good selectivity, high production efficiency, no phase change and energy saving, has potential applications in the industry. In this paper, the characteristics of printing and dyeing wastewater, membrane separation method in the printing and dyeing wastewater and membrane separation in the printing and dyeing wastewater treatment direction of development to do a detailed explanation. How to treat printing and dyeing wastewater? The potential of membrane separation technology is promising China's industrial sector, the textile industry ranked fourth in the discharge of sewage, including printing and dyeing wastewater accounted for 80%, while the wastewater and dye reuse rate was less than 10%. With the increasingly serious shortage of water resources in our country, building a new type of pollution-free intensive production mode and protecting the ecological environment has become a new goal of building a well-to-do society. Therefore, the depth of printing and dyeing wastewater treatment and reuse more and more important. Membrane separation technology for printing and dyeing wastewater treatment has the advantages of good selectivity, high production efficiency, simple equipment, easy operation, no phase change and energy saving. It has potential application in the treatment of printing and dyeing wastewater. Printing and dyeing wastewater treatment by membrane separation technology can remove a large number of organic wastewater, reducing wastewater hardness and ion concentration. Treated wastewater can be used as process water or flushing water use, but also can be recycled part of the dye or auxiliaries and so on. High temperature film processing wastewater can also reduce printing and dyeing process energy consumption. With the continuous development of membrane preparation technology, membrane separation technology has become an important means of printing and dyeing wastewater treatment. 1 printing and dyeing wastewater characteristics Dyeing and dyeing wastewater contained in the color and pollutants mainly from natural organic matter and artificial organic matter formation, wastewater color. Due to the different dyes used in printing and dyeing of different fiber fabrics, different dye uptake rates and different residual dye forms cause the color of the discharged waste water to vary from several hundreds to tens of thousands of times. Dyeing wastewater quality changes, COD can be as high as 2060 - 3000mg / L With the use of new additives, slurry, organic pollutants BOD and COD less than 0.2, low biodegradability, handling more difficult. In order to make dyeing solution and printing paste better dye onto different fabrics, they need to be dyed at different pH values, so the discharged wastewater has different pH values, especially when cotton and its blended fabrics need to be added into printing and dyeing process , Wastewater pH value higher. Dyeing and processing are mostly carried out under high temperature conditions. The temperature of the waste water is relatively high. Due to the different types of fabrics processed, the dyeing temperature and the amount of water required are also different, so that the temperature and the amount of discharged waste water are different. Printing and dyeing wastewater containing dyes and Other colored pollutants, is not conducive to photosynthesis of plants in water, but also lead to the lack of food aquatic animals. At the same time printing and dyeing wastewater containing sulfuric acid or sulfate, contact with the soil after discharge, prone to hydrogen sulfide, causing plant roots decay, is not conducive to microbial growth, leading to soil deterioration. The shortage of water resources and the pressure of environmental protection make the countries in the world attach great importance to the treatment of printing and dyeing wastewater. 2 membrane separation in the printing and dyeing wastewater Dyeing wastewater treatment methods, including physical, biological and chemical methods. Domestic printing and dyeing wastewater treatment mainly biochemical method based, or chemical method in series with it. Membrane separation technology has the advantages of good selectivity, high production efficiency, simple equipment, convenient operation, no phase change, low energy consumption and low treatment cost. The membrane separation technology has advantages both in terms of economy and environmental protection. 2.1 types of membrane separation technology Membrane separation is the use of membrane microporous filtration, the use of membrane permeability, the separation of certain substances in wastewater. Currently used in the printing and dyeing wastewater treatment membrane separation method is mainly the pressure difference as a driving force, such as reverse osmosis, ultrafiltration, nanofiltration and other means. Membrane separation is a new separation technology, with the advantages of high separation efficiency, low energy consumption, simple process, easy operation and no pollution. However, due to the technology requires special equipment, high investment and easy scaling fouling and other shortcomings, it has not yet been widely promoted. 2.1.1 Microfiltration Microfiltration (MF) has the same separation mechanism as the traditional filtration and sieving mechanism. The pore size, hydrophilicity, adsorption and electrical properties of the membrane material are the decisive factors in the separation. MF has been used in the field of printing and dyeing wastewater, many people have done work [1-2], the retention of dye molecules were 95% or more, the use of ceramic microfiltration membrane decolorization rate as high as 98%, and the permeable liquid can be back Use [3]. Phenolic resin micro-filtration carbon membrane membrane flux reached 0.05 m3 / (m2.h) above, the rejection rate can reach 100% [4]. However, the average particle size of the retained microfiltration membrane is between 0.02 and 10 μm, which is larger than the diameter of most particles in the printing and dyeing wastewater. Therefore, the application range is limited.
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How to treat printing and dyeing wastewater? The potential of membrane separation technology is promising
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