The present invention relates to an apparatus for monitoring the progress of
membrane fouling that occurs on pores as well as on the surface of a membrane by
means of variations of zeta potential () of a hollow-fiber membrane according
to time passage of filtration of a suspension, wherein colloid particles, biopolymers
and other inorganic particles are dispersed, and the method thereof. Moreover,
the present invention also relates to a method to identify the effect of concentration
polarization layer and cake layer which can vary according to the axial position
of a hollow-fiber and the developing progress of a membrane fouling by measuring
the position-dependent zeta potential of the hollow-fiber membrane.