Effect of high axial velocity on performance of cellulose acetate hyperfiltration membranes

✍ Scribed by John D. Sheppard; David G. Thomas

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 858 KB
• Volume: 8
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/s0011-9164(00)82010-x

✦ Synopsis

The effkct of axial velocity on performance characteristics of a commercial cellulose acetate membrane was determined in a parallel plate test channel over a 270-fold velocity range, from 0.09 to 24 ft/sec and an applied pressure range of 200 to 1200 psig. Feed was demineralized water or untreated river water spiked with MgCl? to give solution concentrations of 0.04 to 0.0s M. At 800 psig system pressure and 24 ft/sec circulation velocity, intrinsic rejection was -97% and permeability was 0.6 ga:/day -ft2atm with demineralized water feed spiked with MgCI,. Substantially no flux decline was observed with demineralized water feed in a 93-hour run at 24 ft/sec. Even with untreated river water feed containing 10-100 ppm suspended solids, flux decline was relatively modest (a slope of -0.03 on a plot of log flux VS. log time) at a circulation velocity of 2-l ft/sec. Reduction of circulation ke1ocit.y to 1.64 ft/sec resulted in a marked decline in flux with time.