In order to achieve an efficient and economical advanced drinking water system, the relationship between operating conditions, membrane filtration flux and water qualities was examined by using a pilot plant consisting of ozonation facility, ozone resistant microfiltration (MF) module and granular activated carbon (GAC) tower. It was found that keeping residual ozone of more than 0.3 mg/L on the membrane surface is necessary in order to obtain a high membrane filtration flux. Withy ozone dosage of 3 mg/L by ejector and filtration by dead-end mode, this new system provided a high membrane filtration flux of more than 5 m3/m2/day. Quality of the produced water from the GAC tower was meeting the drinking water standard.

Acceleration tests were done using the small-scale microporous membrane (MF) module to predict the increase in transmembrane pressure at the constant flow rate dead-end filtration in a pilot plant for treating the river water or dam water. The kaolin suspension, solution of humic acid and the mixture of kaolin and humic acid were used as feed water in the acceleration tests. The conventional equations of medium blocking filtration were applied to predict the pressure increase for both pilot plant tests and small-scale ones. The experimental results are summarized as follows: (1) The pilot plant tests: The time course of transmembrane pressure was expressed by the complete blocking filtration equation or the standard one when the unstable time at the beginning of operation was excluded. (2) The acceleration tests using small-scale membrane module:(a) No increase in transmembrane pressure was observed when the kaolin suspension and the bentonite one were used as feed water, (b) The increasing rate of transmembrane pressure was lowered by the addition of coagulant into the humic acid solution, (c) The humic acid had a great influence on the increasing rate of transmembrane pressure in the filtration of water containing kaolin or no kaolin and (d) Similar curves of filtration time vs. transmembrane pressure were obtained in the acceleration tests as were obtained in pilot plant tests.

On advanced drinking water treatment ， including unit processes of ozonation ， ozone resistant me 皿 brane 丘ltration and granular activated carbon ( GAC ) tower treatment ， pollutant removal perfbr 皿 ances of unit processes and relationships between some operational conditions and membrane filtration flux were exa1 皿 ined ， Frem the experimental results ， it became obvious that it was necessary to 皿 aintain residual ozone concentration of O 、 2 to 1． O mg 〆 L in the 丘ltrate from the membrane module ill order to mailltain higher membrane filtration flux， With ozone dQsage of 3 nlg 〆 L by an eject ' )r and with operation mode of dead ・ end filtration ， membrane filtration flux of more than 5 m31m21day