6 Enterprises In The Textile Printing And Dyeing Field Are Listed In The Typical Case List Of The Ministry Of Industry And Information Technology

A few days ago, the Ministry of Industry and Information Technology announced the list of typical cases of industrial wastewater recycling in 2024. A total of 58 enterprises and parks in key industries such as steel, petrochemical and chemical industry, textile, paper making, and food appeared in the list, including 6 enterprises in the textile printing and dyeing field.

These cases have the following wastewater recycling modes: first, water use process recycling. Technical equipment such as efficient circulating utilization of cooling water, quality separated water use in the production process, and advanced wastewater treatment and reuse are used to reduce water consumption in the production process, realize serial water use, multiple use of one water and cascade utilization, and improve water reuse rate.

Second, regional industry city integration. Explore cooperation with municipal reclaimed water production and operation units, improve the reclaimed water pipe network, reuse the treated reclaimed water after reaching the standard in the production process, reduce the consumption of new water, and form a new mode of efficient recycling of wastewater that can be replicated and promoted.

The third is smart water pipe control. Using new generation information technologies such as big data, cloud computing, and the Internet, we will establish an intelligent management and control platform for industrial wastewater recycling, form capabilities such as perception, monitoring, early warning, and emergency response, and improve the level of digital management, networked collaboration, and intelligent management and control for industrial wastewater recycling.

Fourth, technological equipment innovation. Focusing on the blocking points and difficulties in the whole process of industrial wastewater recycling, we will strengthen collaborative research and development, innovate and develop low-cost, high-performance industrial wastewater recycling equipment, technology and process, and create a demonstration model of industrial wastewater recycling technology, engineering and services.

Fifth, the synergy of pollution reduction and carbon reduction. Adopt technologies such as water-saving and pollution reduction and greenhouse gas emission reduction collaborative control to promote collaborative treatment of wastewater with different water quality characteristics and reduce wastewater discharge. Explore the combination of industrial wastewater recycling and renewable energy utilization, and carry out the synergy of pollution reduction and carbon reduction throughout the process.

The Ministry of Industry and Information Technology requires actively promoting advanced models and typical experience, increasing support in policy guidance, technological innovation, achievement application and other aspects, and promoting the level of wastewater recycling in the whole industry.

Changzhou Xurong Knitting Printing and Dyeing Co., Ltd.: Water use process cycle mode

The enterprise uses hydrolytic acidification, contact oxidation, air flotation, fine filtration, ultrafiltration and reverse osmosis processes to treat knitting printing and dyeing wastewater. The removal rate of COD, chroma, suspended solids and other indicators in the wastewater (chemical oxygen demand) reaches more than 95%. The quality of recycled water fully meets the needs of knitting printing and dyeing processes, and the reclaimed water recovery reaches 30%. On the basis of the existing 6000 m3/day printing and dyeing wastewater treatment, the introduction of double membrane treatment technology for high salt and high organic wastewater treatment has increased the water reuse rate by 8.28%, reduced the water consumption per unit product by 10.58%, and increased the amount of reclaimed water by 30%. In 2023, the water consumption per unit product will reach 70.8 m3/t.

Hangzhou Xinsheng Printing and Dyeing Co., Ltd.: Water use process circulation mode

The clean sewage of the enterprise enters the waste water reuse facilities in the plant area. After being treated in the membrane bioreactor (MBR) pool, part of it is directly reused for production, and the rest enters the reverse osmosis treatment system. High quality reuse water is used for production; The wastewater reuse facilities in the plant area adopt the internationally advanced membrane treatment system for printing and dyeing wastewater, and the submerged ultrafiltration technology is used to treat the wastewater in combination with the characteristics of wastewater quality, so as to improve the amount of reused water and reuse rate; Establish intelligent water pipe control, with real-time alarm, water analysis and other functions, to monitor the water consumption of each process in the workshop. The wastewater reuse rate increased to 38%, the water reuse rate increased by 12%, and the water consumption per unit product decreased by 35%.

Yuyao Dafa Chemical Fiber Co., Ltd.: regional industry city integration mode

Aiming at the problem that the organic matter in chemical fiber wastewater is difficult to be biodegradable and reused, the enterprise adopts heterogeneous catalytic ozonation, reverse osmosis and other technologies to realize wastewater reuse through mass separation pretreatment. Use reclaimed water from urban sewage plants to replace conventional water resources, save high-quality water resources, and achieve regional integration of industry and city. The recycled water consumption of enterprises accounted for 58.4%, the water consumption per unit product reached 0.65 m3/ton, and the water reuse rate reached 98.3%.

　　 Fujian Fengzhu Textile Technology Co., Ltd.: Water use process cycle mode

The enterprise has established a cascade utilization system of water resources, and the sewage treatment plant has built a reclaimed water reuse system. The printing and dyeing wastewater is deeply treated by the continuous flow sand filter+reverse osmosis process, and the low concentration wastewater is reused after treatment. Strengthen the reuse management of the condensed water of the setting machine and dryer. After the setting machine is heated by medium pressure steam, the condensed water is flashed, and the low-pressure saturated steam generated is supplied to the dyeing machine for use; The condensed water generated by the dryer steam after passing through the heat exchanger is of good quality and high temperature. It is collected into the hot water recovery pool and directly reused in the hot water washing process to make full use of the waste heat and water resources. Through transformation, the water consumption per unit product of the enterprise has decreased by 34%, and the water reuse rate has reached 69.2%.

　　 Huafang Co., Ltd.: Water use process circulation mode

The enterprise has built complete condensate, cooling water, compressor cooling wastewater and other separate recovery systems, and has established a separate water supply system according to the difference in water quality demand. The sewage treatment adopts the separation of clear water and turbid water and separate treatment. Through the establishment of a sewage reuse system, the industrial wastewater discharged close to the standard of internal sewage treatment is applied to the printing machine spray system, as well as to the links with lower water quality requirements such as washing the scraper and cylinder, pre-treatment cold stack and surface washing of the singeing machine. The water reuse rate reached 93.61%, the amount of reclaimed water reached 2031200 cubic meters, and the water consumption per unit product reached 1.03 cubic meters per hundred meters.

　　 Tongkun Group Co., Ltd.: Water use process cycle mode

Aiming at the problems of less renewable water use and low utilization ratio, the enterprise has effectively collected the initial rainwater on the roof and ground of the plant through the new rainwater collection system. The annual utilization of rainwater is more than 44000 tons, effectively reducing the consumption of new water. By recovering steam condensate from downstream heat users, about 115 tons of condensate is recovered every day, and the water consumption of unit product in the central heating plant is reduced by 6%, so that the condensate temperature is cooled from 80 ℃ to 40 ℃, and the heat is recovered. At the same time, in view of the large amount of industrial wastewater produced by chemical fiber industry enterprises and the low recycling rate, the wastewater after biochemical treatment is further treated by reverse osmosis membrane, and the formed reclaimed water is reused for production, with a recycling rate of nearly 80%.