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The effect of ozonation on permeate flux was studied by using a polysulfone ultrafiltration membrane. The filtration was carried out by permeating chemical wastewater treated by combined ozone and membrane filtration methods under 3 kgf/cm2 until steady-state flux was obtained. Then, the ozone of concentration range between 10 and 45 mg/l×min was ozonated in water for reducing the fouling on the UF membrane. It was found that the ozonation made the permeate flux enhance by 10%, and oxidation by ozone and hydrogen peroxide was more effective. Evidence was presented that TMP decreased in more ozone-concentrated water and it was found that the ozone-mediated membrane would have a limited role to prevent membrane fouling rather than to eliminate it fully.

Experiments were conducted to investigate the treatment by ozonation in the membrane process. Emphases were placed on examining the performance characteristics of the combined treatment process. Results from all experimental runs revealed that: 1. The flux rate increased about 12% as the input amount of ozone increased from 10.6 mg/l× min to 45.6 mg/l×min. 2. As TMP increased, it was found that the permeate flux increased in higher concentration of input ozone and slightly decreased in lower ozone concentration over time. Ozonation did not have a significant role to prevent membrane fouling. 3. The addition of a membrane process did little to improve color removal over that by ozonation. In fact, removal efficiency over 91% could be achieved. 4. Based on Fenton’s oxidation/ozonation membrane filtration mechanism, the overall treatment efficiency of TOC had a result of 98%.