Conclusion
Current topics related with the development of deodorizing techniques are as follows: 1) Adoption of
deodorization utilized oxidation action by ozone or plasma is increasing, 2) Photochemical deodorization by
TiO2 is studied and developed with fervor, 3) Simpler equipments of deodorization for restaurant are actively
developed. As described in the second chapter, most of deodorizing method which is charcoal adsorption or
biological method, which is adopted in larger scale plant such as sewage disposal plant. On direct
combustion or catalyst combustion for organic solvent treatment, heat recovery from exhaust gas is thoroughly
studied. In charcoal adsorption, chemical adhesive adsorbent becomes popular than normal type and new
various shapes of charcoal like honeycomb or filament are made and used as adsorbent of new deodorizing
unit.
These high level of techniques related with deodorization is thought to be useful for counter plan of odor
pollution in East Asian countries. But, it is necessary to be considered the economical condition and
environmental strategy of foreign countries on the occasion of technical transference. Specially, I am afraid that
transference of the techniques might end in failure because of the expensive price. So, we have to develop the
deodorizing method toward not only high-performance but also cheaper price. Therefore, the size, cost and
capacity of the equipment should be improved, as they are suitable and easily obtainable. It is important to
understand well about the characteristics of each odor emission sources and its economic condition.