A new report points out that the output of printing and dyeing fabrics has reached a new high in 10 years-in 2021, the cumulative output will exceed 60 billion meters. After experiencing the trough period in 2020, the revenue of printing and dyeing enterprises above designated size in the country will increase by more than 15% year-on-year in 2021, and the growth rate will rise linearly.
Of course, the report also pointed out that the development situation of the printing and dyeing industry is still complicated. The “Guiding Opinions on the Development of the Printing and Dyeing Industry during the “14th Five-Year Plan”” clearly stated that it is necessary to develop in the industry We will make efforts in four major directions: growth, technological innovation, structural adjustment and green development. Green manufacturing is obviously the unavoidable center point. We must improve the green manufacturing system, build intelligent manufacturing demonstration factories, and promote manufacturing products to “increase variety, improve quality, and create brands.” They are all development paths written into the plan.
Up to now, major provinces, municipalities and autonomous regions such as Beijing, Shanghai, Zhejiang, Jiangsu, Shandong, Guangdong, Fujian, Sichuan, and Guangxi have introduced relevant policies and regulations to guide the printing and dyeing industry into high-end Quality, sustainable development channel.
For example, Zhejiang requires Shaoxing, Wenzhou, Jiaxing, and Huzhou to strictly control the production capacity of the textile printing and dyeing manufacturing industry, significantly improve the energy efficiency level of unit added value, and increase energy-saving transformation efforts in high energy-consuming industries such as textile printing and dyeing; such as Shanghai, requires the printing and dyeing industry Strengthen the utilization of wastewater within enterprises; for example, Jiangsu requires breakthroughs in green textile processing, recycled fiber and other technologies; such as Shandong, requires relying on the advantages of Tai’an, Qingdao, Binzhou, Zibo, Yantai and other places to cultivate smart green printing and dyeing bases…
Obviously, the pace of cleaner production in the printing and dyeing industry will be accelerated. After all, the printing and dyeing industry is not only a high-energy-consuming industry, but also a “large producer” of wastewater.
The desizing stage will produce alkaline wastewater with high pollutant concentration and high COD value; the refining stage will also produce strong alkaline wastewater, and cellulose, fruit acid, grease, surfactants, etc. are common pollutants. Needless to say, the bleaching stage has a large amount of wastewater, but the degree of pollution is relatively light. What is worth noting is the bleach residue; there are also stages such as mercerization, dyeing and finishing , wastewater will be discharged, containing impurities such as sodium hydroxide, organic matter, and slurry. It is reported that the process of polyester imitation silk will also produce high-concentration organic wastewater that is difficult to degrade. The technical threshold for the disposal of this type of wastewater is relatively higher.
Let alone sewage, even sludge disposal is not that simple. Due to differences in technological processes, printing and dyeing wastewater sludge needs to be entrusted to professional units with qualifications and technical capabilities for specialized disposal, while general domestic sludge disposal units may not necessarily have the ability to dispose of printing and dyeing sludge.
In addition to wastewater, the printing and dyeing industry also has a set of standards that need to be followed when it comes to waste gas disposal. Taking the Zhejiang local standard “Textile Dyeing and Finishing Industry Air PollutantsEmission Standard” (DB33/ 962-2015) as an example, the particle emission limit ranges from 10-20mg/m3 , VOCs limits range from 30-60mg/m3, formaldehyde ranges from 1-4mg/m3, benzene series ranges from 2-10mg/m3 (except for special processes and circumstances).
In addition, the monitoring regulations for pollutant discharge units are also gradually improved. According to the “Technical Guidelines for Self-monitoring of Pollutant Discharge Units Textile Printing and Dyeing Industry (HJ 879-2017)” standards, automatic monitoring has standardized requirements for monitoring points, monitoring indicators, monitoring frequency, etc., including flow, pH value, COD, ammonia nitrogen, sulfide, etc. Chemicals, anilines, total antimony, hexavalent chromium; non-methane total hydrocarbons, toluene, particulate matter, odor concentration, ammonia, hydrogen sulfide, etc., all need to be recorded, and noise monitoring, surrounding environmental quality impact monitoring indicators, etc. are also added. .
In addition, the operation status of production and pollution control facilities, general industrial solid waste and hazardous waste must also be recorded, and information reports, emergency reports and information must be disclosed in accordance with HJ 819.
The development of the industry is improving across the board, and pollution reduction and carbon reduction cannot be left behind. The “double carbon” goal is at the forefront. As a “big polluter”, the printing and dyeing industry must naturally be more actively involved in the upgrading and transformation of cleaner production.
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