Four emission standards for water pollutants in the textile industry will be implemented in January

Editor:桐乡市鑫宝莱纺织有限公司 │ Release Time:2018-12-14 

The Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine recently jointly issued the "Water Discharge Standard for Textile Dyeing and Finishing Industry", "Water Discharge Standard for Silk Industry", "Water Pollutant Emission Standard for Woolen Industry" and "Mafang Industry" The four emission standards, such as the Water Pollutant Emission Standard, together constitute the series of standards for water pollutant discharge in the textile industry. The new standard will be implemented from January 1, 2013.

The relevant person in charge of the Science and Technology Standards Department of the Ministry of Environmental Protection said that the implementation of the new standards will improve the environmental protection threshold for the textile industry, help reduce water pollutant emissions, and promote the sustainable and healthy development of the textile industry. “The implementation of the four standards will effectively promote the emission reduction of pollutants in the textile industry. After the existing enterprises implement and reach the emission limit of the second stage, the emission of pollutants will be greatly reduced, including chemical oxygen demand and ammonia nitrogen. Compared with 2010, the emission reduction is expected to reach 68% and 70% respectively, and the environmental benefits are significant."

Pollution is still a big problem: emissions rank fourth in the industrial sector

According to the person in charge, China is the world's largest textile production and processing base. At present, China's cotton yarn, cotton, wool, silk, chemical fiber products and clothing and other major products rank first in the world, and it is a major textile production and processing country. In 2011, the total industrial output value of textile-scale enterprises was 3.4491 trillion yuan, accounting for 3.9% of the country's total industrial output value. However, at present, China's textile processing is still dominated by medium and low-end products, and the added value of products is relatively low. The enterprises are mainly small and medium-sized, and the technological level of production technology and technological innovation capability still need to be further improved.

In recent years, due to the development of new products, new dyes and new processes, while the quality, production efficiency and water-saving efficiency have increased, the concentration of pollutants in the textile industry wastewater has also increased significantly, and environmental protection issues have become increasingly prominent. According to statistics, in 2010, the chemical oxygen demand and ammonia nitrogen emissions of the textile industry were 301,000 tons and 17,000 tons, respectively, accounting for 8.3% and 7.1% of the total industrial emissions, respectively, ranking fourth.

With the acceleration of building a resource-saving and environment-friendly society, the textile industry has put forward higher requirements in energy conservation and emission reduction, elimination of backward production capacity, and reduction of environmental impact. In order to effectively control the pollutant discharge of the textile industry, it is clearly stated in the National Twelfth Five-Year Plan for Environmental Protection that it is necessary to increase the elimination of backward production capacity in industries such as printing and dyeing, improve the emission standards of industrial pollutants, and promote chemical oxygen demand and ammonia nitrogen. Total emission control, the reduction ratio is no less than 10% of the planning target in 2010. At the same time, the newly introduced "Twelfth Five-Year Development Plan for Textile Industry", "Twelfth Five-Year Development Plan for Printing and Dyeing Industry", and "Admission Conditions for Printing and Dyeing Industry" and other industrial planning and policies have also raised the environmental protection of the textile industry. Specific requirements.

What new requirements are proposed by the new standard?

Form the whole process environmental control of the industry, tighten the emission limit "to better adapt to the new requirements of the '12th Five-Year' environmental protection work, further increase the pollution prevention and control work of the textile industry, on the basis of summing up practical experience, The Standard for Emission of Water Pollutants in Textile Dyeing and Finishing Industry (GB4287-1992) is revised, and it is necessary to newly develop water pollutant discharge standards for silk reeling industry, wool textile industry and hemp textile industry," the official said.

He told reporters that in the original standard system setting, in addition to the textile industry, the textile dyeing and finishing industry implemented separate industrial pollutant discharge standards, silk, wool, and hemp, etc., all implemented the "Integrated Wastewater Discharge Standard." In the "Integrated Wastewater Discharge Standard", only the chemical oxygen demand and BOD5 indicators have separate regulations for the wool washing wastewater and ramie degumming wastewater, and the other indicators all implement uniform emission limits, which causes the industry characteristics to a certain extent. Contaminants are not fully identified, emission control is not targeted, and the differences are difficult to reflect.

The newly released four standards comprehensively cover the natural fiber textile production and processing process in China, forming the whole process environmental control of the industry. The textile dyeing and finishing standard mainly controls the pretreatment of cotton and the dyeing and finishing process of cotton, hemp, wool, silk and chemical fiber. Water pollutant discharge; silk standard, wool standard, and hemp standard mainly control the water pollutant discharge of silkworm cocoon processing, silk washing process and hemp degumming process. “The system is more clear and complete, and it is more targeted to the pollution prevention and supervision of the industry.”

In terms of emission control requirements, the newly introduced series of standards have also raised the overall requirements and strengthened environmental risk prevention. Among them, the newly revised "Dyeing and Finishing Industry Water Pollutant Emission Standards" has tightened the emission limits of chemical oxygen demand, five-day biochemical oxygen demand, suspended solids and ammonia nitrogen, etc., compared with the original standards. More stringent emission limits for water pollutants have been established for environmentally sensitive areas, and indirect emission limits have been set to strengthen the supervision and management of wastewater discharge from public sewage treatment systems.

For the production of pollutants in the dyeing and finishing industry in the printing and dyeing, bleaching and other processes, the new standard retains the original standards of sulfide, aniline, hexavalent chromium, chlorine dioxide and other characteristics, and further tightened the emission limits. At the same time, the addition of organic halogen (AOX) indicators has been added to strengthen the emission control of toxic and harmful pollutants and prevent environmental risks. In addition, in order to strengthen the control of water eutrophication, the new standard has added total nitrogen and total phosphorus indicators to meet the needs of environmental management.

The newly developed three standards of silk, wool and hemp textile industry have identified characteristic pollutants for various types of fiber production and processing, and have improved water pollutant emission control requirements to varying degrees.

The person in charge told the reporter that in the new standard, the setting of indicators is more scientific and reasonable, which is conducive to promoting the improvement of pollution prevention and control technology. The standard discharge of the unit product is set in each of the four standards. The setting of this indicator can prevent dilution and discharge on the one hand, and can also effectively promote water conservation and improve the level of clean production.

It is worth noting that in the “Dyeing and Finishing Industry Water Pollutant Emission Standard” (GB4287-1992), the maximum allowable displacement is expressed by the amount of water discharged per 100 meters of cloth, which makes it possible to process different widths and thicknesses. The limits for product implementation are the same, and the newly revised standards are expressed in terms of tons of product displacement.

What adjustments should each industry make?

Each control limit has mature and reliable technology, and the technical feasibility of the existing enterprise to set a transition period for the industry is worried. The person in charge said that each control limit in the new standard formulation has mature and reliable. Control Technology.

Textile dyeing and finishing industrial wastewater can be strengthened by pretreatment and subsequent deep treatment on the basis of common biochemical treatment, which can meet the requirements of the newly revised standard. By promoting the use of wastewater deep purification cycle technology, the silk industry has promoted the application of lanolin extraction technology, and the hemp textile industry can reach the new standard emission limit through effective physical and chemical pretreatment and advanced treatment. At the same time, the implementation of the new standard will further promote the research and development and application of new technologies for pollution prevention and control in the textile industry, and promote the development of related environmental protection industries.

From the perspective of environmental management, the new standard will be implemented step by step. The new enterprise is required to implement the new standard from January 1, 2013, and a reasonable transition period has been set for the existing enterprise. It is required to reach the pollution control level of the newly-built enterprise on January 1, 2015. In addition, considering the regional distribution and production process characteristics of tussah silk, the requirements for pollutant control of existing tussah silk reeling enterprises are relaxed, and the existing tussah silk reeling enterprises only implement the standard first-stage limit, and since 2015 Implemented on January 1. “Considering the difference between new and old pollution sources, and considering the process characteristics, technological progress and industrial optimization and upgrading, it embodies the guiding ideology of optimizing economic development with environmental protection.” (China Environment News)