High-efficiency physical and chemical combination technology jointly developed by Wuhan University of Science and Technology and Wuhan Fangyuan Environmental Technology Co., Ltd. , successfully solved the cost problem of textile printing and dyeing wastewater treatment. The cost of using this technology to treat wastewater is less than 2 yuan per ton, and by treating 1 ton of high-temperature wastewater and reusing it, companies can realize benefits of more than 10 yuan. At present, the second printing and dyeing wastewater treatment project applying this technology has entered the engineering design process in Fujian, and the first high-temperature printing and dyeing wastewater treatment project built in Shanghai was completed and put into operation in October last year, applying the new technology system of physical and chemical combination When treating knitting or printing and dyeing wastewater, the COD removal rate is greater than 90%, the TOC removal rate is greater than 80%, the chroma removal rate is greater than 95%, and the SS removal rate is greater than 97%. The treated wastewater effluent can be directly reused in the washing process.
It is understood that this process and core technology that has achieved a major breakthrough is called “Endless Ultraviolet Photocatalysis” “Oxidation” technology is a new research and development from the national 863 major project new high-efficiency physical and chemical combination technology.research results. The inventor of this technology, Dr. Zeng Qingfu, Vice President of Wuhan University of Science and Technology, has begun research on this topic since the 1990s, and has successively presided over the completion of the national “Ninth Five-Year Plan” key research project – Research on photochemical decolorization technology and equipment for printing and dyeing wastewater , as well as the national key research project—intermittent dyeing wastewater photocatalytic decolorization and recycling technology and equipment pilot testing.
In the research of efficient physical and chemical combination technology, Zeng Qingfu and his research team used microwave to stimulate plasma Collaborative oxidation technology and coagulation co-precipitation integrated technology, with microwave induction and adsorption long-lasting catalyst as the core, form a collaborative process for hierarchical treatment according to the complex printing and dyeing wastewater quality. Its core component, the infinite ultraviolet light source, has a working time of more than 15,000 hours and a catalyst life of more than 6 months.
This technology can save a lot of energy and water while controlling textile wastewater pollution. purpose. According to testing, the temperature of countercurrent rinsing wastewater from flat washing machines is as high as 85°C or above, which contains considerable heat energy value. 1 ton of this wastewater is recovered for each treatment.For water, the cost savings and benefits achieved by enterprises exceed 10 yuan, which is far lower than the cost of treating wastewater. This process and core technology have obtained 2 invention patents and 1 utility new technology patent. It is estimated that the hot water reuse value of a flat washing machine is more than 2,000 yuan per day. If the wastewater discharged by 100,000 flat washing machines and overflow dyeing machines across the country is treated with this technology, water and fuel costs can be saved in one year. Up to 6 billion yuan.
At present, the utilization of water resources in my country is relatively extensive, with low water efficiency and serious waste. Especially in the industrial field, the reuse rate of industrial water is less than 60%, which is 15 to 25 percentage points lower than that of developed countries. The utilization of seawater and brackish water in industrial water is only equivalent to 21.3% of Japan and 12.8% of the United States. A large amount of high-temperature printing and dyeing wastewater is discharged across the country every year, which not only pollutes the environment but also loses huge amounts of heat energy. The State Environmental Protection Administration stated that by 2010, all printing and dyeing enterprises must use environmentally friendly raw materials to implement clean production, and the state will support the updating of production equipment and the transformation of sewage treatment technology in the printing and dyeing industry.
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