摘要
考察了不同功率的超声波对超滤膜性能的影响 .结果表明 :2 0W功率的超声波对超滤膜截留率的影响不大 ,大于 30W以后 ,超滤膜的截留率下降明显 .在此基础上 ,对实际工业现场印钞擦版废液污染超滤膜的化学清洗过程中 ,附以 2 0W低功率超声波 ,可以发挥其超强振动和超搅拌作用 ,从而将化学清洗时间从 2 0～ 30min缩短到 5min左右 ,极大地提高了膜清洗效率 .SEM的观察结果显示 ,在仅采用简单的超声波物理清洗时 ,膜表面的污染物并不能彻底有效地得以清除 .
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 20W ultrasound on membrane retention coefficient, but it decreased seriously when the ultrasound power was above 30W. On the basis of these results, low frequency ultrasound (20W) 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 20～30min to 5min 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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第6期130-134,共5页
Environmental Science
基金
中国科学院重大特别资助项目 (KZ95 1 A1 2 0 1 0 2
KZ95T 0 5 )
关键词
低功率超声波
超滤
膜清洗
印钞擦版废液
low frequency ultrasound
ultrafiltration(UF)
membrane cleaning
wastewater from bank note printing works
