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Bio textile enzyme greening printing and dyeing industry helps to reduce wastewater discharge

bio textile enzyme greening printing and dyeing industry helps to reduce wastewater discharge

September 22, 2016

[China paint information] recently, researcher song Xiao of Tianjin Institute of industrial biology, Chinese Academy of Sciences took the lead in developing bio textile enzyme technology, which replaces caustic soda in the pretreatment of printing and dyeing materials, which will greatly reduce wastewater discharge and save water and electricity, Evaluated by the industry as another important technological innovation in China's printing and dyeing industry

have you ever thought about the environment in which the T-shirts, jeans or dresses you wear are produced? In fact, colorful clothes bring great damage to the environment. The printing and dyeing industry has always been the representative of backward production capacity with high pollution and energy consumption. In recent years, many places, especially the first tier cities, have gradually moved out of the printing and dyeing industry, or even closed down

at the same time, printing and dyeing is an indispensable part of the textile industry. Under the pressure of policies, the printing and dyeing industry is also constantly seeking technological innovation and moving towards green printing and dyeing

the bio textile enzyme technology, developed by researcher song Xiao of Tianjin Institute of industrial biology, Chinese Academy of Sciences, can greatly reduce wastewater discharge and save water and electricity by replacing caustic soda in the pretreatment of printing and dyeing materials. It has been evaluated as another important technological innovation in China's printing and dyeing industry

the printing and dyeing industry urgently needs to resist pollution

"at present, the pollution problem of China's textile industry has reached the point where it is urgent to solve. Traditional textile production not only pollutes the environment, but also produces various harmful chemicals, which cause damage to our bodies. The whole society should jointly resist the polluting and consumptive production process..." according to the data released by the international environmental protection

earthpledge: "At least 8000 chemicals in the world will use 25% of pesticides to grow non organic cotton in the process of making textiles from raw materials. This will cause irreversible damage to human beings and the environment, and 2/3 of the carbon emissions will continue to occur after the purchase of clothing." Tens of gallons of water will be consumed in the process of processing clothing fabrics, especially in the fabric dyeing process. The dyeing of synthetic materials requires 2.4 trillion gallons of water

China's environmental statistics show that among the key investigated industries, the textile industry is a major polluter. The wastewater discharge of textile industry ranks among the top among the 41 industries in China, and the wastewater discharge from printing and dyeing process accounts for more than 70% of the textile wastewater discharge

in addition, as an important source of water pollution, China's textile industry also consumes huge water resources, which lags far behind other parts of the world in terms of water resource utilization efficiency. According to the report on prevention and control of industrial pollution in national key industries published by China Environmental Science Press, under the condition of producing similar unit products, the average content of pollutants in printing and dyeing wastewater in China is 2-3 times that of foreign countries, and the water consumption is as high as 3-4 times; At the same time, printing and dyeing wastewater is not only the main pollutant in the industry, but also has problems in the treatment of sludge generated by printing and dyeing wastewater

among them, the pretreatment of printing and dyeing materials causes serious pollution due to the use of a large amount of caustic soda. "Before dyeing, it needs to be treated with caustic soda, steam it hard, and then neutralize these caustic soda with hydrochloric acid, which will discharge a large amount of waste water." Gaozhongqiang, manager of the Tianjin Office of Hebei Fanglian material supply and Marketing Co., Ltd., who has worked in the front line of printing and dyeing enterprises for many years, said that the detailed verification results would be published at the SAE World Conference held in Detroit from April 21 to 23

in view of this situation, song Xiao, from Tianjin Institute of industrial biotechnology, Chinese Academy of Sciences, led the team to first aim at the development of new enzymes that can replace caustic soda. A large number of level 3 carton factories will be shut down after the Spring Festival, which will inevitably lead to the development of preparations

biological enzyme preparation solves the printing and dyeing problems

the classification process of the displacement sensor of the traditional pre printing and dyeing tensile testing machine includes five steps: singeing, desizing, refining, bleaching and mercerizing. Although foreign companies had previously produced enzyme preparations for pretreatment of printing and dyeing, they were only used for desizing

song Xiao introduced that enzyme preparation is a kind of high-efficiency, low consumption and 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. However, before that, the cost of enzyme preparation was relatively high due to the single variety of enzyme preparation, the research on the compatibility of enzyme preparation and textile auxiliaries was lacking, and a complete enzyme pretreatment process has not yet been formed

this time, song Xiao's team reached close cooperation with Tianjin Tianfang group and Hebei Fanglian material supply and Marketing Co., Ltd. after three years, they developed a variety of biological enzyme preparations for textile and their production processes with excellent properties, including amylase, alkaline pectinase, xylanase and hydrogen peroxide enzyme, which can combine desizing and refining into one step, greatly improving the efficiency of pretreatment

"desizing refining composite enzyme preparation solves the problem of difficult desizing of mixed sizes of polyester cotton and pure polyester grey cloth. The previous amylase desizing can only solve the problem of grey cloth starched, and grey cloth with PVA mixed size can only be removed by high-temperature alkali boiling." Dingxueqin, chief engineer of Tianfang group, said that grey cloth varieties containing flame-retardant silk and pure polyester components cannot be desized by high-temperature alkali boiling, otherwise they will shrink. However, the desizing effect of using biological composite enzyme is very good, preventing grey cloth from shrinking, and the desizing starch and PVA are clean. At the same time, the treated cloth feels fluffy and soft, which also solves a technical problem for the factory

save water and electricity, reduce sewage discharge

song Xiao introduced that the enzymatic desizing and refining can be 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 the steam energy consumption. Compared with the traditional process, it saves 25% - 50% steam and 40% electricity

the relatively new software with fast data collection of raw plastic tensile testing machine can more easily obtain the peak load enzyme pretreatment process to replace the traditional process of caustic desizing and caustic refining, which means that the biological fermentation products can replace the chemical agents such as caustic soda and refining agent. Therefore, the pH value and cod value of the treated wastewater can be greatly reduced, The effective replacement of refining agent and other chemical agents can reduce the COD value in the pretreatment wastewater by more than 60%

"the 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 fiber, but has a high-efficiency degradation effect on the starch size and PVA size on grey cloth, reaching a good desizing effect." Song said that the quality of cotton fiber treated by this technology is much higher than that of traditional methods

as for the price issues that printing and dyeing enterprises are concerned about, song Xiao said that the biological composite enzyme has high enzyme activity and low consumption, and the price is equivalent to that of general textile additives. It will not increase the treatment cost, which is acceptable to most textile enterprises. In addition, the application of biological enzymes for pretreatment can significantly reduce the cost of pretreatment and improve the economic benefits of the textile industry by reducing steam energy consumption, eliminating the cost of alkaline wastewater treatment, and reducing the amount of various chemical additives

"in the application of enzyme pretreatment process of Tianfang, the cost of 12000 m pure cotton cotton cloth and 11000 m aramid heat wave card can be reduced by 30% and 70% respectively compared with the traditional alkali process." Dingxueqin said

it is expected to be popularized to nearly 20 enterprises within three years.

from March to June this year, Hebei Ningfang group successfully completed the application demonstration and promotion of the biological enzyme pretreatment process for more than 16000 meters of cloth

previously, the biological enzymatic pretreatment process using the biological complex enzyme was successfully tested for the first time in Tianjin Tianfang group, and the pilot production experiment of more than 3million meters of cloth was completed. The experimental varieties include military camouflage, tent waterproof cloth, aramid, etc

song Ju said that he would continue to cooperate with Hebei Textile Federation to improve the technology promotion, form a technical service team to serve the national printing and dyeing enterprises, and complete the promotion and application of 10-20 textile enterprises in the next three years, creating a cumulative new profit of 50million to 100million yuan

at the recent conference of biological textile enzyme achievements, the Fujian dealer who came to the conference told him that he thought the product would be welcomed by printing and dyeing enterprises, and he had decided to act as an agent for the product

"we will also further improve the technology, carry out research and development for other links of printing and dyeing, and develop more technologies and products." Song Ju said

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