Vol 33 No 4 Text - International Ozone Association
Vol 33 No 4 Text - International Ozone Association
Vol 33 No 4 Text - International Ozone Association
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<strong>Ozone</strong> News <strong>Vol</strong>ume <strong>33</strong>, <strong>No</strong>. 4<br />
Application of <strong>Ozone</strong> and <strong>Ozone</strong> Resistant Microfiltration Membranes<br />
for the Reuse of Secondary Effluent<br />
Takuya Onitsuka, Shizuo Takeda<br />
R&D Division of SUIDO KIKO Co., Ltd, 5-48-16 Sakuragaoka Setagaya-ku, Tokyo,156-0054, JAPAN<br />
Abstract<br />
A new reclamation system by combining microfiltration (MF) membrane with ozone was developed<br />
to obtain a better water quality in sewerage reuse. The MF membrane was a hollow fiber made from<br />
polyvinylidenefluoride that has a high ozone resistance. The reclamation system using this MF<br />
membrane together with ozone could provide high filtration flux of 5 m3 /m2. d and a stable operation<br />
without chemical cleaning for long terms. This is because ozone decomposed or denatured a part of<br />
organic materials in the sewerage water and reduced fouling of the membrane surface. The water<br />
obtained by this reclamation system has a high quality and excellent in security against pathogenic<br />
organisms. This system was constructed at Shibaura water reclamation center, bureau of sewerage of<br />
Tokyo Metropolitan Government. The reclamation water of a high grade has been supplied to the<br />
redeveloped area as toilet flush water and cooling water since April 2004.<br />
Keywords<br />
<strong>Ozone</strong>; Reuse; Reclamation; <strong>Ozone</strong> Resistant Microfiltration Membrane;<br />
Introduction<br />
The effective usage of water resources and energy in<br />
sewage works is desired and the ability to recycle water is<br />
a priority to assist in the problem of global water<br />
shortage. The secondary effluent from wastewater<br />
treatment plants is a valuable water resource and its reuse<br />
is given priority in this issue. The reclamation water is<br />
used a in variety of applications such as landscape<br />
irrigation, environmental uses, industrial activities,<br />
agricultural irrigation, snow melting use and toilet<br />
flushing etc. In case of water shortage areas and the<br />
redeveloped area in a large city, the use of reclamation<br />
water for environmental uses and toilet flushing is<br />
increasing. It is necessary for these reclamation waters to<br />
have a high quality, as human beings have more<br />
opportunities for being in direct touch with them.<br />
Therefore, bacteria and pathogenic organisms must be<br />
taken into consideration in addition to suspended<br />
matters, color and odor.<br />
Membrane filtration is a solid-liquid separation method<br />
with high performance. There are few instances of<br />
membranes in sewerage reclamation division, as it is likely<br />
to be fouled by the organic matters and a higher cost than<br />
that of other separation methods. <strong>Ozone</strong> has a strong<br />
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chemical oxidation property. <strong>Ozone</strong> is expected to<br />
decompose organic materials in the water and reduce a<br />
fouling of the membrane surface. The new reclamation<br />
system using MF membrane together with ozone was<br />
developed and introduced into the sewerage treatment<br />
plant.<br />
Materials and Methods<br />
Figure 1. The flow sheet of the developed reclamation<br />
system