Mitsubishi Gas Chemical Company, Inc.

Takayoshi Hamaguchi

Tadashi Shimomura

Kazuyuki Minato

Toshimi Matsumoto

A deodorant, for substances containing hydrogen sulfide or mercaptans, which includes a combination of a peroxide and a nitrate ion, a combination of a peroxide, a nitrate ion and a metal salt, or a combination of a chelating agent and one of the above combinations, and a process for deodorization comprising treating a substance for treatment, containing hydrogen sulfide or mercaptans, with the above deodorant. Smell caused by hydrogen sulfide or mercaptans is effectively removed by the deodorant. Smell from waste water, sludge, and water discharged from washing apparatuses can be efficiently removed with use of the deodorant in a small amount in accordance with this process.

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Chiba-ken, Japan

Takayoshi Hamaguchi