[in Japanese]

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For the reduction of volatile organic compounds (hereinafter referred to as the “VOC”) , one of the causative agents of the photochemical oxidant, we are enforcing the emission control of VOC called “Best Mix” , which is an appropriate combination of legal control and voluntary approach by business entities.
“Best Mix” is aiming at reducing the emission quantity from the FY 2000 level by about 30% by FY 2010.
We estimate VOC emission inventory every year. Based on our estimation, about 20% emission reduction was achieved in FY 2006.compared to the emission in FY 2000.

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Atmospheric oxidation of volatile organic compounds (VOCs) is essential to the production of photochemical ozone and secondary organic aerosols. Formation of organic peroxy radicals reduces the effective bond energy of O₂ and leads to photochemical production of ozone through the oxidation of NO to NO₂. Concentrations and chemical components of secondary organic aerosols are influenced by the oxidation mechanisms of VOC_s.

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Recently, Regenerative Thermal Oxidizer is rapidly being adopted for effluent gas purification processing because of its high energy-saving performance.
RTO is most suitable for processing of VOC, having high combustion heat. By treating high concentration gas generated from the process of paint dryer equipment, the surplus thermal energy can be used effectively. Combined RTO with the other production facilities in the whole factory, the further energy saving can be achieved and it results in helping further reduction of CO₂ as well.
Even for low concentration gas or chlorine containing gas, etc., it is possible to treat these gases with higher energy saving by means of systematizing with the other devices.

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An oxidizer or recovery equipment is ordinarily used as an End of Pipe Technology to control VOC emission. For treatment of emission gas containing VOC with voluminous airflow and low concentration, there are such problems that not only extremely large-scale facilities are necessary but putting it into practice will entail a huge amount of running cost. To solve the problem, use of a VCO concentrator is conceivable in the preceding process. With this equipment, voluminous airflow and low concentration emission can be converted to small amount of airflow and high concentration emission, respectively. At the same time, the cost of equipment and running cost will be reduced. Thus high-efficient VOC treatment can be materialized.

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Activated carbon adsorption equipment has a track record in many fields as the measure against malodor and recovery subsystem of the organic solvent. However, there is the problem that you must change frequently because the quantity that can adsorb the active carbon is limited. These problems are realized by developing the system, which Reproduces - reuses the technical development and the activated carbon for which activated carbon is easily exchangeable. As a result, the VOC abatement equipments is can be built, Without the generate of carbon dioxide (CO₂).

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The time intensity during odor exposure has long been thought to decline as an exponential function. We recently reported, however, that the time intensity curves to the exposure of triethylamine showed variety and were classified to five typical patterns ; an exponential curve (which we call as pattern A from now on), an exponential and so constant curve (pattern A'), a fluctuating curve (pattern B), a constant high intensity curve (pattern C), and a gradually enhancing curve (pattern D). The purpose of the present study is to investigate the relation of these time intensity curves with perceptual characteristics of odor. Odor gas was presented with constant concentration for 10 minutes by the olfactometer. Thirteen healthy females participated in two experiments of different concentration. A participant rated time intensity using a sliding lever during odor exposure, and evaluated hednics, overall intensity, familiarity, and odor quality after exposure of odor. As the results, the group of pattern A and A' (A&A') showed less overall intensity than the group of pattern B and C (B&C) in both concentrations, and less unpleasantness in high concentration. In addition, the group of A&A' showed less suitability to the odor quality “excrement” than that of the group of B & C. These results indicated that the variety of time intensity curves related to perceptual characteristics of odor, though further examination is required for other odors and more subjects including men.

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