難濾性泥漿的固液分離研究─子計畫四：結垢薄膜之特性分析與結垢機制之探討(2/2)

In this present work, to clarify the
mechanism of protein fouling, microfiltration
experiments were performed with bovine
serum albumin (BSA) and track-etched poly-carbonate
membranes. On the basis of the
SEM analysis on the fouling layers and the
in-situ measurement of the thickness of
protein deposits, it was found that the
deposition rate of BSA aggregates governed
the growth of filtration resistance in the
initial period. On the other hand, in the late
period, the dominant mechanism was the
compression of the deposited layer. To
develop a suitable model for the resistance growth due to compression, the time
dependence of cake porosity and the
relationship between specific cake resistance
and cake porosity were determined. The
results suggest that the time dependence of
cake porosity can be described by the Voigt
model, and the relationship between specific
cake resistance and cake porosity can be
described by the Kozeny equation. By
incorporating the compression model into the
combined model of pore-blockage and cake
filtration, the resistance growth during
microfiltration can be well described.