1 results about "Biological pollution" patented technology

The invention discloses a biological pollution resistant reverse osmosis composite membrane and a preparation method thereof. The preparation method comprises the following steps: contacting a porous ultrafiltration support layer with a tannic acid aqueous solution; contacting with a ferric salt aqueous solution; contacting with a silver nitrate solution; contacting with a polyamine aqueous solution; and contacting with a multi-acyl chloride solution, drying in air at room temperature, and soaking in pure water to obtain the biological pollution resistant reverse osmosis composite membrane. Test results show that the anti-biological pollution reverse osmosis composite membrane prepared by the invention has excellent retention rate and antibacterial property, and meanwhile, the retention rate is kept to be 97.4% or above while relatively high water flux is achieved. In addition, the sterilization capability on staphylococcus aureus and escherichia coli is very high. Meanwhile, the membrane has excellent anti-adhesion performance on bacteria, and microbial contamination on the surface of the membrane can be effectively prevented.