Vol 33 No 4 Text - International Ozone Association

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Ozone News Volume 33, No. 4 Effect of dissolved ozone on TMP The change of TMP (transmembrane pressure) with a variation of dissolved ozone on the membrane surface is shown in Figure 3. It is evident that the behavior of TMP is influenced by dissolved ozone concentration. That is, keeping the dissolved ozone concentration on the membrane surface at 1.0mg/L can prevent the rise of TMP. Therefore, this reveals that the dissolved ozone may decompose or modify organic materials on the membrane surface and reduce fouling of membrane. The dissolved ozone concentration of 1.0mg/L is necessary to keep the stable operation of MF membrane system. Page 24 The change of TMP during the continuous filtration test is shown in Figure 4. The dissolved ozone concentration on the membrane surface was controlled approximately 1.0 mg/L. Membrane flux was 5.0 m3/m2. d. TMP doesn’t rise rapidly and change slowly. At an elapse of 3,800 hours, TMP goes to only 120kPa. This value is less than TMP of 200kPa, at which chemical cleaning is necessary. This proves that a stable membrane operation at high flux in the long term is obtained by controlling the dissolved ozone concentration of 1.0 mg/L on the membrane surface. Conclusions The reclamation system using MF membrane together with ozone could provide high filtration flux of 5 m3 /m2. d and a stable operation without chemical cleaning in the long term. The water obtained by this reclamation system was a high quality and excellent in security against pathogenic organisms. This system has following superior features: 1. The reclamation water obtained has a high quality without color, odor and suspended matters. Furthermore, it is excellent in security against pathogenic organisms. 2. An economical membrane filtration system can be designed based on higher filtration flux. 3. This system can be installed in a limited space. Based on the above-mentioned data, the reclamation plant was constructed at Shibaura water reclamation center, bureau of sewerage of Tokyo Metropolitan Government and began to operate in April 2004. This plant has treatment capacity of 4,300 m 3/d. MF membrane units are shown in Figure 5 (page 30). The reclamation water is distributed to the redeveloped areas in Shinagawa, Shiodome and Oosaki as toilet flashing water and environmental uses. The water quality of reclamation water obtained is much better than that of existing sand filters and gets a good reputation by users. In addition, the heat island phenomenon is now at stake in highly urbanized areas. Sprinkling water on the roads gives effect of preventing temperature on the roads and in the atmosphere from going up. This reclamation water is used as a measure of the heat island phenomenon. In the future, the reclamation water with high water quality is desired to apply progressively for many kinds of reuse.
Ozone News Volume 33, No.4 Page 25
Page 1: Lake Lanier Islands, Site of Next I
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Vol 33 No 4 Text - International Ozone Association

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