Water Environment Federation (WEF)

Impact of Cell Surface Characteristics on Membrane Fouling

Initial deposition of S. cerevisiae particle to plate type membrane was conducted with direct observati on system(DOB). Solution chemistry was controlled by ionic strength variation(0mM ~ 50mM) with N aCl, MgCl2, CaCl2. Predictable tendency by DLVO theory was that increment of ionic strength make in teraction forces decrease and make it easier to be attached to membrane, finally. Although DLVO model missed the effect of ion valency, test results showed that divalent ion was more powerful than monovalent ion in reducing interaction forces between particles.

Attachment test showed good agreement with model result, so increment of ionic strength make detachment rate decreased. But existence of extracellular polymeric substance (EPS) resulted in difference between detachment experiment and DLVO prediction values. EPS removed yeast exhibited somewhat slower detachment rate by increasing cross flow velocity when compared to the raw yeast cells Yeast particle has softness characteristics by Ohshima’s soft particle theory which can be applied almost microorganisms. This DLVO theory modification help to predict the behavior of microorganism in membrane systems more precisely by including the effect of EPS structure.

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