The purpose of this study is to investigate the effect of the operational parameters of the
UV intensity and TiO2 dosage for the removal of humic acid and heavy metals. It also evaluated the
applicability of hollow fiber microfiltration for the separation of TiO2 particles in photocatalytic
microfiltration systems. TiO2 powder P-25 Degussa and hollow fiber microfiltration with a 0.4 μm
nominal pore size were used for experiments. Under the conditions of pH 7 and a TiO2 dosage 0.3
g/L, the reaction rate constant (k) for humic acid and heavy metals increased with an increase of the
UV intensity in each process. For the UV/TiO2/MF process, the reaction rate constant (k) for humic
acid and Cu, with the exception of Cr in a low range of UV intensity, was higher compared to that
of UV/TiO2 due to the adsorption of the membrane surface. The reaction rate constant (k) increased
as the TiO2 dosage increased in the range of 0.1~0.3 g/L. However it decreased for a concentration
over 0.3 g/L of TiO2. For the UV/TiO2/MF process, TiO2 particles could be effectively separated
from treated water via membrane rejection. The average removal efficiency for humic acid and
heavy metals during the operational time was over 90 %. Therefore, photocatalysis with a
membrane is believed to be a viable process for humic acid and heavy metals removal.
Biosorption of heavy metals from aqueous solutions by Saccharomyces Cerevisiae