Printing and dyeing: energy conservation and emission reduction industry

The printing and dyeing industry has made remarkable achievements in energy conservation and environmental protection. The printing and dyeing industry is at the middle of the industrial chain of the textile industry. It is an indispensable industry that enriches the variety of textile products and enhances the added value of textile products. It is an important industry that embodies the core competitiveness of the textile industry. At the same time, due to the characteristics of wet processing and chemical processing, this industry has also assumed the responsibility of pollution reduction in the entire textile industry, and is a key industry for energy saving, emission reduction and environmental protection in the textile industry.

In recent years, the printing and dyeing industry has done a lot of work in energy conservation and emission reduction and environmental protection, and has invested a lot of manpower and material resources, and has also achieved remarkable results. For example, the printing and dyeing industry carries out large-scale technological transformation and phase out obsolete equipment with high water consumption and poor stability. The number of energy-saving, water-saving, consumption-reducing, and environmental-friendly equipment has increased, and the level of automation of equipment has been continuously improved.

At the same time, the printing and dyeing industry has made many breakthroughs in terms of clean production technology, advanced wastewater treatment and recycling technologies, and recycling technologies.

After years of efforts, the energy saving and emission reduction level of the printing and dyeing industry has been greatly improved. From 2005 to 2012, the water consumption of fresh water for printing and dyeing in the printing and dyeing industry dropped from 4 tons to 2.3 tons, a cumulative decrease of 42.5%; the average printing and dyeing wastewater The reuse rate increased from 15% in 2005 to over 25%, an increase of 10%. From 2005 to 2011, the output value of printing and dyeing wastewater was reduced by 36.79%, and the discharge value of chemical oxygen demand from printing and dyeing wastewater was decreased by 55.79%.

Of course, due to the rapid development of these years, the printing and dyeing industry has left some debts due to energy conservation and emission reduction, and there is a place that does not harmonize with the progress of the industry.

The new emission standard for the printing and dyeing industry, "Emission Standards for Water Pollutants in the Textile Dyeing and Finishing Industry" (GB4287-2012), has been actively implemented throughout the country and some problems have also been reflected in the implementation. In response to the implementation of the new standard, the Printing and Dyeing Association conducted extensive investigations and heard opinions from industry associations, printing and dyeing enterprises, and dyeing and dyeing wastewater centralized treatment plants. On November 26, 2013, the Dyeing and Dyeing Industry Industry Organization organized a special “Water Contamination for Textile Dyeing and Finishing Industry. Emission Standards Implementation Workshop".

The most intense problems reflected in various places are concentrated on the “indirect CODcr limits”. At present, more than 95% of corporate CODcr management standards are set by local government departments based on local conditions, or agreed between printing and dyeing companies and sewage treatment companies. The limits are mostly around 500~1000mg/L. The new CODcr indirect emission limit was added to the new standard and set to 200 mg/L, and the sensitive area was 80 mg/L.

The main difficulties and problems that this brings are: On the one hand, the vast majority of enterprises must carry out large-scale investment transformation of sewage treatment facilities in order to meet the requirements of the new standards, and the implementation of land for reconstruction is difficult. On the other hand, the influent load of the existing centralized sewage treatment companies has been drastically reduced, resulting in the idleness of a large number of structures and equipment of the existing centralized sewage treatment plants, thereby causing serious waste of resources. For example, when the centralized printing and dyeing wastewater treatment plant in Changzhou was originally built, it was generally designed with influent CODcr1200mg/L and effluent CODcr100mg/L. After the Taihu Lake drainage limit was reformed, the effluent CODcr was 60mg/L. According to the new standard, the special emission limits for water pollutants (indirect CODcr emissions 80mg/L, direct CODcr emissions 60mg/L) will cause centralized sewage treatment plants to operate in a difficult or unserviceable manner. Another example: the daily treatment of 1.1 million tons of sewage treatment system in Shaoxing County is in normal operation, and it can treat printing and dyeing wastewater to the discharge standard of CODcr 80mg/L or less.

At present, about 50% of the enterprises in Shaoxing County do not meet the CODcr 200mg/L indirect emission standards. If they are to meet the requirements through the upgrading of the standard, the county will increase 1.33 square kilometers of land and invest 2 billion yuan. It is understood that in Europe, the United States, Japan and other countries' sewage discharge standards do not set indirect emission limits. The concentration of waste water pipe is a problem negotiated between the printing and dyeing companies and the water treatment enterprises. The role of the market in the allocation of resources should be brought into full play and the market mechanism should adjust itself. In addition, the setting of indirect emission limits disperses the monitoring power of the environmental protection department and is not conducive to concentrating on monitoring the end emission.

The new standard was released on October 19, 2012 and implemented on January 1, 2013. Many indicators of the new standard are tightened, and it takes time to complete the standard upgrade to carry out trials and scale up, otherwise it will result in many shortcomings such as blind investment, unstable operation, and waste of resources. The new standard did not give the company a transition period to raise the bid.

In response to the new emission standards, we have repeatedly reported to the relevant departments of the Ministry of Environmental Protection that we hope to relax or cancel the requirements for indirect emission limits based on actual conditions in each region. As long as the final emission standards are met, the company should be considered as meeting the standards. The government of Shaoxing County (now Keqiao District) in Zhejiang Province also reported to the Ministry of Environmental Protection that it wants to relax the requirements for indirect emission limits.

Environmental protection organizations such as Lulu and the environmental protection organizations on the "new standard test brand responsibility" article, involved in the printing and dyeing enterprises 26, the main data from the website public data, the detection time is mostly in 2013 1~2 quarter. Of the 26 companies involved, 1 (Yangor) was directly discharged, and 25 companies managed to discharge 96.15% of the total. The index of over-standard for in-line companies is mainly COD, the standard is 100 or less, and the actual 100 to 200. The over-standard management companies mainly include COD, biochemical oxygen demand, ammonia nitrogen, PH, chroma, suspended solids, etc.

Regarding everyone's opinions on the new standard, the Ministry of Environmental Protection has been investigated and researched, and it has been loosened. The reply to the Shaoxing County government means that, in the case of clearing related responsibilities, CODcr 200mg/L indirect emission standards may not be implemented. Other regions may also The same method will be reported to the Ministry of Environmental Protection. At present, Shaoxing County still implements the CODcr 500mg/L management standard.

The printing and dyeing industry will continue to promote industrial environmental protection countries to raise standards for printing and dyeing wastewater discharge standards, as well as other environmental protection policies, put forward new requirements and new challenges for the environmental protection work in the printing and dyeing industry, and bring difficulties to printing and dyeing enterprises. Pressure, but it is also an inherent requirement for the transformation and upgrading of the printing and dyeing industry.

In recent years, a large number of printing and dyeing companies have invested a great deal of capital and technology in energy conservation, emission reduction and environmental protection. The printing and dyeing industry will continue to increase efforts in energy conservation and emission reduction and environmental protection work, deepen the energy conservation and emission reduction environmental protection work, strive to obtain practical results, make the industry energy conservation and emission reduction environmental protection work to a new level, and enhance the industry's sustainable development capability .