[Study on assistant cleaning of ultrasound for the ultrafiltration membrane].
The effects of ultrasounds with different frequency on membrane performance were investigated in this paper. The experimental results show that there were nearly no effects of 20 W ultrasound on membrane retention coefficient, but it decreased seriously when the ultrasound power was above 30 W. On the basis of these results, low frequency ultrasound (20 W) was introduced to assist the chemical cleaning in the ultrafiltration process of wastewater from bank note printing works. The cleaning time could be shortened from 20-30 min to 5 min by the ultra-liberation and ultra-blend effects of ultrasound, therefore, the cleaning efficiency was highly improved. However, the fouling substances could not be cleaned entirely in the simple physical cleaning process by SEM analysis.
Zhang
Guojun
G
Center for Environmental Engineering, Chinese Research Academy of Environmental Sciences, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
Liu
Zhongzhou
Z
D007220:Industrial Waste; D008567:Membranes, Artificial; D014462:Ultrafiltration; D014465:Ultrasonics; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D008567:Membranes, Artificial