Application of membrane technology in industrial wastewater treatment

Application of membrane technology in industrial wastewater treatment

Membrane technology is a relatively advanced technology. What are its applications in industry? 

For example, in the application of dye wastewater treatment and papermaking wastewater treatment.

Here is the detailed analysis by flat ceramic membrane manufacturers:

1. Application of membrane technology in dye wastewater treatment

During the production of dyes, a large number of high salinity, high chromaticity and high waste water are usually produced. The ratio of bod5 and CODCr in this kind of industrial wastewater is generally less than 0.4, so the effect of Biodegradation Technology is not obvious. Because the wastewater contains salts, which can reduce the biodegradability of wastewater, it needs to be pretreated before biochemical treatment. In practice, the aqueous solution of stilbene ditriazine fluorescent brightening dye can be desalinated and concentrated by rolled nanofiltration membrane. The concentration of NaCl can be reduced from 1.05 mole per liter to 0.049 mole per liter by nanofiltration membrane treatment at 1.8 MPa pressure. The rejection rate of components in wastewater exceeds 99%.

At the same time, the wastewater from acrylic fiber washing can also be treated by rolled reverse osmosis membrane. When the concentration of caprolactam monomer in the wastewater exceeds 2000mg/L, the monomer concentration is more than 10 times, and the retention rate is about 80%. The permeate can be used for process water, which can effectively save fresh soft water and has remarkable economic benefits. In addition, cellulose acetate nanofiltration membrane can also effectively treat dye wastewater. It can effectively separate reactive brilliant red and X-3B aqueous solution, CA nanofiltration membrane energy of reactive dye printing and dyeing wastewater treatment and dye recovery effect is more significant.

2. Application of membrane technology in papermaking wastewater treatment

For the paper industry, its daily production process will consume a large amount of water. If wastewater is discharged at will, it will inevitably cause serious pollution to the natural environment. In practice, it can be seen that the composition of pulp and papermaking process are different, and the industrial wastewater produced is also quite different.

Usually, chemical precipitation, flotation, activated sludge and air flotation are used in the treatment of paper industry wastewater. However, from the effect point of view, the above methods or treatment measures are difficult to achieve the effect of wastewater treatment, especially activated sludge treatment method, in hot and high temperature environment conditions may affect the treatment efficiency. In recent years, the application of osmotic membrane separation media, such as UF, NF, RO and ED, has become a new research hotspot in pulp and wastewater treatment. Generally speaking, there are many valuable chemical products in papermaking wastewater, such as vanillin, lignosulfonate and lignin, which can be effectively recovered by the application of membrane technology.