The dirty printing and dyeing wastewater is re-used after being turbid and diverted, layered and purified, and returned to the production workshop for reuse. A project, integrating several advanced technologies, has repeatedly filled the gaps in domestic and foreign industries, and has been used by Jiangsu, etc. The 21 companies in the area are widely used... These scenes and figures are related to a research project called “Dry Flux Wastewater Treatment and Recycling Technology and Industrializationâ€. This research project led by Donghua University won the second prize of National Science and Technology Progress Award in 2008.
The development of the textile industry has become increasingly serious about environmental protection and energy consumption. Professor Dong Danli from the School of Environmental Science and Engineering of Donghua University described it as the “can†of the development of the textile industry. According to statistics, the annual displacement of the textile industry ranks the fourth in China's industrial drainage, 80% of which is printing and dyeing wastewater. To fundamentally change the status quo of textile pollution, we must start with the "hard bones" of "啃" printing and dyeing wastewater treatment.
“We have proposed the idea of ​​wastewater reuse from the early 1990s.†Professor Yan introduced that the degree of automation and standardization of printing and dyeing enterprises in China is limited, and there is no relevant experience abroad. It is necessary to find a wastewater recycling method that meets the characteristics of China's printing and dyeing enterprises, and realize the ideal of turning waste into treasure. It can only start from scratch and innovate independently.
Technological breakthroughs Starting from the “membrane†to make the wastewater “rebornâ€, we must first find the key factors affecting the quality of the water. In the process of independent research and development, the team has focused its research on a target called Chemical Oxygen Demand (COD). The higher the COD, the more serious the water pollution. Professor Yan said that foreign countries use activated carbon filtration and adsorption methods to reduce COD. The effect is good, but the cost is high. Is there any way to effectively reduce COD and save money? Professor Yan gave them the answer: "large flux low-cost fiber membrane" technology. They not only boldly apply membrane technology to the industrial field, but also break the convention that the finished film at home and abroad consists of a single material, and creatively use a multi-material "pairing" method to form a film. This increases the membrane pore size and flux, allowing an increase in the amount of water returned per unit of time and space.
Teamwork is the key to winning the award "We are able to win awards, * the main reason is still teamwork." According to Prof. Yan, the main feature of the research team of Donghua University is that it is professionally complete. From design and construction to management and debugging, everyone can play a special role. As the head of the research team, both the professors of Yan Danli and Chen Jihua have been near the age of the past, but they insist on doing experiments every day and going to the factory. When it comes to awards, Professor Yan seems very indifferent: "I like to engage in environmental research. This is already a habit. We do not do this for other purposes, as long as the wastewater is well managed and good for the society. The people are satisfied, it is for us. * Big awards."
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