The printing and dyeing industry urgently needs to resist pollution
The current pollution problem of China’s textile industry has reached the point where it needs to be solved urgently. Traditional textile production not only pollutes the environment, but also produces various harmful chemical substances, which cause damage to our bodies. The whole society should jointly resist polluting, Consumable production process.
According to the data released by the International Environmental Protection Earth Pledge (EarthPledge): “There are at least 8,000 kinds of chemicals in the process of making raw materials into textiles in the world, and 25% of pesticides are used to grow non-organic cotton. This will cause harm to humans and Irreversible damage to the environment, and 2/3 of the carbon emissions will continue to occur after the purchase of clothing.” Dozens of gallons of water are consumed in the process of processing clothing fabrics, especially the fabric dyeing process, the dyeing of synthetic materials 2.4 trillion gallons of water are required.
China’s environmental statistics show that among the key surveyed industrial sectors, the textile industry is a major polluter. The discharge of wastewater from the textile industry ranks among the top among 41 industries in the country, and the discharge of wastewater from the printing and dyeing process accounts for more than 70% of the discharge of textile wastewater.
In addition, as an important source of water pollution, China’s textile industry also consumes huge water resources, lagging far behind the rest of the world in terms of water resource utilization efficiency. According to the “Report on the Prevention and Control of Industrial Pollution in National Key Industries” published by China Environmental Science Press, in the case of the production of similar unit products, the average content of pollutants in printing and dyeing wastewater in my country is 2-3 times that of foreign countries, and the water consumption is as high as 3-4 At the same time, printing and dyeing wastewater is not only the main pollutant in the industry, but also the sludge generated by printing and dyeing wastewater has problems in treatment.
Among them, the pretreatment of printing and dyeing materials is particularly serious due to the use of a large amount of caustic soda. “It needs to be treated with caustic soda before dyeing, steam it to harden it, and then use hydrochloric acid to neutralize the caustic soda, which discharges a lot of waste water.”
Biological enzyme preparations solve printing and dyeing problems
The traditional pretreatment process of printing and dyeing includes five steps of singeing, desizing, refining, bleaching and mercerizing. Although some foreign companies had previously produced enzyme preparations for pre-treatment of printing and dyeing, they were only used for desizing.
Enzyme preparation is a high-efficiency, low-consumption, non-toxic biocatalyst, and the biological treatment method based on enzyme preparation is an ideal way to solve the high pollution and high consumption in the printing and dyeing industry.
The enzymatic desizing and refining is completed at one time, which not only saves the high temperature of the traditional treatment process, but also, the enzymatic treatment temperature is carried out at a low temperature, which greatly reduces the steam consumption in the pretreatment process and significantly saves steam energy consumption. Compared with the traditional process In comparison, it saves 25%-50% of steam and 40% of electricity.
The biological enzymatic pretreatment process replaces the caustic soda desizing and caustic soda refining process in the traditional process, which means that the biological fermentation product can replace caustic soda, refining agent and other chemical preparations. Therefore, it can greatly reduce the pH value and COD value of the treated wastewater, and refine The effective replacement of chemical preparations such as chemical agents can reduce the COD value in pre-treated wastewater by more than 60%.
“Biological compound enzyme preparation has the characteristics of mild treatment conditions, high efficiency, and good specificity. The application of biological enzyme treatment has almost no damage to cotton fibers, and has a high-efficiency degradation effect on starch size and PVA size on gray fabrics. A good desizing effect was achieved.”