The category on“reprocessed materials”is first clarified as opposed to“new materials”for discussing its route in resource recovery system.
To analyse the level of recovering of resources, an equation was derived to relate the quanties of discharged waste, reprocessed material and the net amount of treated waste. The resource recovery trends can be characterized by six regions in the plane of x (the amount of discharged waste) and y (the resource recovery rate ) .
As a practical example, waste paper recovery is examined, and the trends are noted. For this, the data of the 22 years span 1955 to 1976 have been used.

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The behaviors of N₂O and NO_x in the photo-reaction in N₂O-NO_x-N₂ and N₂O-NO_x-air mixtures were studied. N₂O was not changed by the presence of NO, NO₂ and O₃ and not affected by the UV irradiation with high pressure mercuy lamp. N₂O decomposed to N₂ and O₂ under the UV irradiation with low pressure mercury lamp and the decomposition rate was proportional to the concet-ration of N₂O. The reaction was not affected by NO, NO₂ and O₃. NO in N₂O-NO-N₂ mixture did not change under the UV irradiation with high pressure mercury lamp, while decomposed to N₂ and O₂ under the irradiation with low pressure mercury lamp and the decomposition was accelerated a little by O₂ formed by the decomposition in N₂O. NO in air was oxidized to NO₂ under the dark reaction, while did not change under the irradiation with high pressure mercury lamp because of the formation of NO by the photo-decomposition of NO₂. NO was photo-oxidized by the UV irradiation with low pressure mercury lamp. All of these reactions of N₂O-NO-air mixtue were not at-fected by N₂O. NO₂ in N₂ did not change in the dark reaction and decomposed to NO and O₂ with high pressure mercury lamp irradiation. NO₂ decomposed to NO and reduced partially to N₂ by the low pressure mercury lamp irradiation. The rates of these reactions were same with those in the presence of N₂O. NO₂ in air decomposed to NO and O₂ by the high pressure mercury lamp irradiation and was oxidized to higher oxides by the low pressure mercury lamp irradiation. These reaction rates were not change the presence of N₂O,

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[in Japanese]

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[in Japanese]

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