Reuse Of Printing And Dyeing Wastewater From Donghua University

In China's industrial sector, the textile industry's emissions accounted for fourth, of which printing and dyeing wastewater accounted for 80%, and the recycling rate was less than 10%.

The team led by Professor Xi Dan Li, Donghua University, has worked hard for many years to study the technology of printing and dyeing wastewater treatment and reuse. It has successfully implemented industrialization and won the two prize of national science and technology progress in 2008.

The most direct goal of reducing pollutants in wastewater is to reduce the chemical oxygen demand (COD) in the wastewater.

In the developed countries, activated carbon adsorption is often used in the treatment of printing and dyeing wastewater, but the cost is high and China's large-scale textile industry can not afford it.

As a result, Xi Dan Li's scientific research team aimed at "membrane" technology, tried to apply membrane technology to the industrial field, and broke the practice of making more finished products from single material at home and abroad.

This improves the pore size and flux of membrane and increases the backwater volume per unit time and space, thus adapting to the high demand of industrial wastewater reuse.

With the use of large flux membrane technology, the recovery rate of printing and dyeing wastewater can be raised from 10% to 45%, and the power consumption per ton of waste water will be reduced from 3 to 4 degrees to 0.8 degrees.

In the past more than 10 years, Xi Dan Li research team has studied a series of printing and dyeing wastewater treatment and reuse technologies, such as Datong membrane. Now, it has spent more than 20 enterprises in Jiangsu, Zhejiang, Shandong, Guangdong, Fujian and so on. In the past 3 years, COD has been reduced by about 160 thousand tons, and nearly 70 million yuan has been saved for enterprises.

More clothing investment information, click here to enter the responsibility editor: Wang Xiaonan