Response of zeta potential to different types of local membrane fouling in dead-end membrane filtration with yeast suspension

Abstract

The zeta potential which responded to local membrane fouling forms with yeast suspension was investigated by monitoring both local flux and local zeta potential. Experiments adopting segmentation and in suit monitoring methods during dead-end hollow membrane filtration process were conducted. Comparing the model with experimental data, it could be found that zeta potential reflected the forms of local membrane fouling. The variations in zeta potential during membrane filtration performed differently in pore blocking, cake formation and cake compression processes. When zeta potential decreased rapidly, pore blocking occurred. As zeta potential dropped gradually and linearly, it came to cake filtration. Subsequently, when zeta potential became almost stable, it was experiencing cake compression. Besides, the effect of fiber length on local fouling behavior was also studied. With the increase of fiber length, the time taken by three segments to enter the cake layer compression stage was extended and the difference values of zeta potential in three segments tended to increase.

In-situ monitoring techniques for membrane fouling and local filtration characteristics in hollow fiber membrane processes: A critical review

“…Both the tangential streaming potential and streaming current changed linearly with the pressure difference even when there was no fully laminar flow [56]. Furthermore, Jia et al [57] demonstrated that the zeta-potential varied depending on the fouling mechanisms ( Fig. 7).…”

“…Flux and zeta potential variations vs. filtration time at three different positions of the membrane module[57].…”

A review of in situ real-time monitoring techniques for membrane fouling in the biotechnology, biorefinery and food sectors

“…They demonstrated that it was possible to monitor cake layer thicknesses greater than 15 µm. Based on these methods, Jia et al [194] investigated the response of the zeta potential to local fouling such as pore blocking, cake formation and cake compression when filtering a yeast suspension in horizontal dead-end hollow-fiber membrane modules under constant pressure. They were able to distinguish local fouling from changes in the zeta potential, and observed a rapid decrease in zeta potential due to pore blocking, a gradual, linear decrease in zeta potential during cake formation, and almost no change in the zeta potential during cake compression.…”

The role of shear conditions on floc characteristics and membrane fouling in coagulation/ultrafiltration hybrid process – the effect of flocculation duration and slow shear force

“…1 However, fouling is one of the main disadvantages of membrane ultraltration processes, with the result that a decline in ux results in higher water treatment costs and the deterioration of the membrane. 2 Different pre-treatments before ultraltration have been widely applied as methods to reduce membrane fouling, such as coagulation, adsorption and oxidation. A combination of powder active carbon (PAC) adsorption and UF has been reported to more effectively mitigate membrane fouling.…”