“Taihu New Standard” raises the threshold of environmental protection again – the structural adjustment of Jiangsu’s textile industry adds pressure
The reporter recently learned from the Jiangsu Provincial Environmental Protection Department that the “Emission Limits of Main Water Pollutants for Urban Sewage Treatment Plants and Key Industrial Industries in Taihu Area” environmental standards will be officially implemented on January 1, 2019. The implementation scope of this standard includes the municipal districts of Wuxi, Changzhou and Suzhou, Lishui County and Gaochun County of Nanjing City, Danyang City and Jurong City of Zhenjiang City and other Taihu Lake Basin areas. It is understood that this was compiled by the Jiangsu Provincial Party Committee and the Provincial Government after the “Taihu Lake Blue-Algae Incident” organized by the Jiangsu Provincial Environmental Protection Department and the Provincial Quality Supervision Bureau. It is also the third stricter than the “national standard” issued by Jiangsu Province in the past three years. local environmental standards. The implementation of this standard will accelerate the structural adjustment of the textile industry in the Taihu Basin.
“Taihu New Standards” Promote Industrial Structure Adjustment
According to Pan Liangbao, deputy director of the Science and Technology Department of the Jiangsu Provincial Environmental Protection Department, the new emission standards involve six major industries: textile dyeing and finishing, chemistry, papermaking, steel, electroplating, and food manufacturing. and centralized sewage treatment plants, highlighting the control of major pollutants such as nitrogen and phosphorus. The emission limits refer to the regulation standards of Lake Biwa in Japan. This standard is more stringent than the original emission standards. Taking the textile dyeing and finishing industry as an example, the allowed emission concentration of COD pollution is 60 mg/L, which is 40 mg/L lower than the existing implementation standard and 120 mg/L lower than before 2005. Jiangyin City, which has always been classified in the Yangtze River Basin, has the status of a “Taihu Lake Basin City” for the first time. Jiangyin enterprises must also comply with this new pollution discharge standard like enterprises along Taihu Lake. The new standards also restrict the total amount of sewage discharge from five industries including printing and dyeing. Among them, only 2 cubic meters of water can be discharged for every 100 meters of cloth production.
Professor Xi Danli from the School of Environmental Science and Engineering of Donghua University calculated this: if COD emissions from textile printing and dyeing enterprises drop from 1500 mg/L to 100 mg/L, the pollution control cost per ton will be RMB 2; when When the COD standard is raised from 100 mg/L to 80 mg/L, the pollution control cost will increase by 2 yuan per ton; when the COD standard reaches 80 mg/L, for every 10 mg/L decrease, the pollution control cost will increase by 2 yuan per ton. Yuan. This means that when COD emissions increase from the national first-level standard of 100 mg/L to the current “Taihu New Standard” of 60 mg/L, printing and dyeing enterprises will pay a sewage treatment cost of 6 yuan/ton. The almost harsh “Taihu New Standard” has caused one-third of the existing textile printing and dyeing companies in Jiangsu’s Taihu area to face closure, suspension, merger, or transfer. However, the reporter interviewed some printing and dyeing companies around Taihu Lake and found that their awareness of environmental protection is very strong, and each company is taking different measures to adapt to new changes based on its actual situation. Changzhou Senrong Textile Co., Ltd. built a sewage treatment tank, and the sewage was pre-treated and then connected to the sewage treatment plant in the Economic Development Zone. In addition, some companies use environmentally friendly dyes, laying the foundation for reducing the generation of sewage. For example, Donggao Dyeing and Finishing Co., Ltd. and three neighboring companies use environmentally friendly new paints for dyeing, and establish a sewage treatment plant for joint pollution control. After reaching the first-level emission standards, they are then handed over to the second-level treatment station for treatment. Suzhou Printing and Dyeing Factory Co., Ltd. increased investment in sewage treatment equipment in 2007 and conducted in-depth treatment of printing and dyeing wastewater. Tang Qinyu, deputy general manager of Changzhou Jiufeng Printing and Dyeing Co., Ltd., which is relocating, said that during the relocation process, the company must make major adjustments in equipment, eliminate a number of backward energy-consuming equipment, introduce advanced environmentally friendly and energy-saving equipment, and implement national requirements for energy conservation and emission reduction.
Wuxi Chenyang Printing and Dyeing Co., Ltd. had no production in June and July 2007 after the “blue algae” incident. Now, the company has installed a set of pollution treatment equipment as required to solve the problem of unstable sewage values entering the network. Xu Zhiyong, general manager of the company, said that the pollution control problem will be solved in accordance with environmental protection management requirements. Yao Wenwei, general manager of Wuxi Shengda Printing and Dyeing Co., Ltd., frankly told reporters that the standards for discharge of printing and dyeing wastewater are getting higher and higher, and the company is overwhelmed. It plans to close the printing and dyeing factory within three years, and is currently preparing for other projects supported by national policies.
Shi Zhenhua, director of the Jiangsu Provincial Environmental Protection Department, said that by raising pollutant emission standards, new projects that are technically unable to meet emission standards can be kept out. At the same time, companies that cannot meet emission standards can be forced to withdraw from the market or evacuate according to law, thereby freeing up valuable land and environmental resources to encourage and guide printing and dyeing companies to adopt high and new technologies to transform traditional industries and continuously improve technical equipment and product quality. level, produce marketable, green and environmentally friendly textile printing and dyeing products, and continuously improve the added value of printing and dyeing products and the market competitiveness of products.
Deep pollution control enterprises responded positively
At present, within the Taihu Lake Basin, some traditional textile printing and dyeing bases have formed a complete industrial chain from raw materials and auxiliary materials to textile, dyeing and finishing, products and markets. Printing and dyeing enterprises have moved in The industrial park has initially realized the optimization of industrial layout and created basic conditions for the centralized treatment of printing and dyeing wastewater. In the printing and dyeing industrial park, the method of centralized treatment of printing and dyeing wastewater has the advantages of low unit wastewater treatment investment, low management costs, good operating results and easy management. The reporter discovered during an interview with Zhangjiagang Suntory Dyeing and Finishing Co., Ltd.��Due to the adoption of cleaner production, the company not only controls the emission of pollutants in each production process, but also saves energy such as water, electricity, and coal, reflecting environmental benefits.
Recently, the Jiangsu Provincial Environmental Protection Department proposed to implement a “sewage advanced treatment demonstration project” in enterprises. According to Pan Liangbao, “advanced sewage treatment” is to use appropriate methods to further remove pollutants in industrial wastewater and domestic sewage on the basis of meeting standards, improve and ensure water quality, and recycle them. For example, the state stipulates that the COD emission standard for a certain industry is 100 mg/L, and now requires it to be treated to 50 g/L or even lower. It can be said that this is a more stringent standard, and its implementation comes from the actual pressure of sewage discharge.
Wujiang Hengyu Textile Dyeing and Finishing Co., Ltd. invested more than 14 million yuan and introduced a complete set of advanced sewage treatment equipment from Italy. The sewage treatment is completed in two steps. The first step is to control the COD of printing and dyeing wastewater within 100 mg/L to achieve discharge standards; the second step is to continue to treat some water that has reached national discharge standards to about 40 mg/L, so that it can be reused in production. Zhang Yougen, the company’s engineer in charge of environmental protection, told reporters that Hengyu produces about 3,000 tons of printing and dyeing wastewater every day, but the emission permit approved by the environmental protection department is only 1,200 tons/day. Therefore, they first treated 3,000 tons of wastewater to meet the standards, and then conducted advanced treatment on more than 1,800 tons of it, so that all of it could be reused in the production process. In this way, the company’s production capacity has not dropped, but the actual amount of sewage discharged has dropped by more than half. “Currently, only Hengyu can recycle the wastewater into production in Wujiang.” A relevant person from the Wujiang Municipal Environmental Protection Bureau said that Wujiang should cut down on “advanced wastewater treatment” and “reclaimed water reuse” in the printing and dyeing industry. An important means of controlling the total amount of sewage discharge, it has been gradually promoted throughout the city.
Practice has proven that it is indeed feasible to carry out advanced treatment of sewage until it is reused in production. In the face of the “Taihu New Standard”, experts pointed out that in addition to accelerating the adjustment of industrial structure and product structure, we should also strengthen the concept of environmental protection, carry out clean production, reduce pollution from the source, improve the coloring rate of dyes, and reduce the waste of dyes. To reduce water loss, choose degradable slurry and biodegradable detergents with less foam to reduce energy consumption, speed up the technical transformation of water treatment facilities, and truly realize “green textile”. (AAVEGTRHYTJ
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