Serious Problems Of Pollution In China'S Textile And Dyeing Industry Need To Be Solved Urgently.

< p > "the pollution problem of China's textile industry has reached an urgent task.

Traditional textile production not only pollutes the environment, but also produces all kinds of harmful chemical substances that cause damage to our bodies.

The whole society should boycott the polluting and consumptive production process. "

Zhang Tianmei, representative of China environmental protection textile certification agency, said at the forum.

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What are the pollution caused by China's textile printing and dyeing? What measures have been adopted in China to restrict the emission of textile enterprises? Why is pollution still prominent? How to restrict the source of pollution from the system? < /p > p

< p > < strong > wastewater discharge accounted for more than 70% < /strong > < /p >

< p > according to the data released by Earth Pledge, "at least 8000 chemicals in the world will use 25% pesticides to grow non organic cotton in the process of making raw materials into textiles.

This will lead to irreversible damage to human beings and the environment, and the carbon emissions of 2/3 will continue to occur after the purchase of clothing. "

In the process of processing the fabric, dozens of gallons of water will be consumed, especially the dyeing process of the fabric. The dyeing of synthetic materials requires 2 trillion and 400 billion gallons of water.

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< p > China's environmental statistics show that textile industry is a major pollutant exporters in key industries.

The waste water discharged from textile industry ranks among the 41 industries in the country, and the waste water generated by printing and dyeing process accounts for more than 70% of the textile wastewater discharge.

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< p > in addition, as an important source of water pollution, China's textile industry also consumed a huge "a href=" http://www.91se91.com/news/index_c.asp "water resource < /a", which lagged far behind other parts of the world in terms of water resources utilization efficiency.

According to the "report on prevention and control of industrial pollution in key industries" published by the China Environmental Science Press, the average content of pollutants in China's printing and dyeing wastewater is 2-3 times that of abroad, and the water consumption is 3-4 times higher than that of the similar units. At the same time, the printing and dyeing wastewater is not only the main pollutant in the industry, but also the sludge produced by printing and dyeing wastewater.

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Zhang Tianmei said that the production department of the environmental protection department has made a conclusion that the production process of most printing and dyeing enterprises in China (especially small and medium-sized enterprises) is at the beginning of 1980s, and the energy and resource consumption is several times higher than that of the developed countries in terms of unit production, for example, the amount of water used for the first ton of national fiber dyeing and printing is about 100 tons, while China is generally 300 tons -400 tons.

Most of the printing and dyeing enterprises adopt a single stage aerobic treatment process. Although some pollutants are removed, a large number of toxic and harmful substances (such as cyanide) are discharged into rivers and lakes, causing pollution to the water bodies.

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< p >, therefore, the situation of energy saving and emission reduction in the whole textile industry is becoming more and more serious.

"The biggest problem is emission reduction, especially sewage disposal."

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A report from the public environment research center (P) shows that the industrial pollution discharge of China's clothing industry has caused serious environmental problems, but the pace of improvement is extremely slow.

Lack of environmental improvement and governance is a common problem in the industry.

Most of today's clothing needs printing and dyeing, and printing and dyeing can not be separated from chemical industry.

About 25% of the world's chemicals are used in the textile industry.

China's textile industry consumes 42% of the world's textile chemicals.

The chemicals will be discharged into the natural environment through waste water, and some of them will remain in < a href= "http://www.91se91.com/news/index_c.asp" > clothing > /a >.

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< p > < strong > waste gas is more difficult to supervise than waste water < /strong > /p >

< p > in addition, Gong Jun, an associate professor of the environmental protection standards committee of the Chinese Federation of environmental protection and an associate professor of the school of materials science and engineering, Beijing Institute Of Fashion Technology, told reporters that "the exhaust gas of textile printing and dyeing industry is also a large contribution to PM2.5, but it has not received enough attention."

He pointed out that at present, there is no specific emission standard for textile printing and dyeing industry. The lack of standards makes the relevant waste gas treatment and monitoring technology almost blank.

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< p > as early as 1992, China issued and implemented the "discharge standard for water pollutants in textile dyeing and finishing industry", and strictly controlled the discharge of textile printing and dyeing wastewater.

In 2012, the Ministry of environmental protection completed the first revision of the standard. The revised standards are more stringent than before, and some new pollutant emission limits have been added.

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< p > "in fact, < a href=" http://www.91se91.com/news/index_c.asp "> textile > /a > exhaust gas is more concealed and more difficult to monitor than waste water. Due to the lack of specific and targeted standards, a large number of textile waste gas is basically discharged through the exhaust cylinder or in the form of no fabric to the atmosphere.

Gong said frankly.

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< p > < 2011 - 2020 unconventional control pollutants emission inventory analysis and Prediction Research Report > data show that in 2008, China's textile printing and dyeing industry VOCs (volatile organic compounds) emissions accounted for 8.8% of the total VOCs emissions from different sources, accounting for more than 30% of VOCs emissions from industrial processes.

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< p > VOCs is a general term for a class of organic pollutants which are ubiquitous and complex in the air. It mainly includes alkanes, olefins and aromatic hydrocarbons. In general, these volatile gases will directly pollute the air directly after they are discharged into the atmosphere.

In addition, VOCs can also generate two organic aerosols by complex photochemical reactions and become an important source of PM2.5.

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< p > Where are the main sources of exhaust gas in the process of textile processing? Gong says that in the hot melt dyeing process of polyester disperse dyes, the high temperature causes the dye of some small molecules to sublimate to exhaust gas.

Cotton fabric's non iron and flame-retardant finish must be baked. As a result of adding some chemical additives, formaldehyde and other aldehydes and ammonia can be released during baking.

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