To sufficiently and stably deodorize even an odor gas with a high odor concentration and a large load variation.
The odor gas is brought into contact with a metal phthalocyanine derivative (hereinafter referred to as phthalocyanine) A of a first apparatus 1 and hydrogen sulfide and methylmercaptane are oxidized/decomposed at a high efficiency by the phthalocyanine A with a higher removal ration of hydrogen sulfide and methylmercaptane than phthalocyanine B of a second apparatus 2, and methyl disulfide is produced by oxidation/decomposition of methylmercaptane. The treated gas is brought into contact with the phthalocyanine B of the second apparatus 2 and methyl sulfide and methyl disulfide not removed by the first apparatus 1 and methyl disulfide generated by the oxidation/decomposition of methylmercaptane in the first apparatus 1 are oxidized/decomposed at a high efficiency by the phthalocyanine B with a higher removal ration of methyl sulfide and methyl disulfide than the phthalocyanine A of the first apparatus 1 to remove them. The all four odor components are removed at a high efficiency.
MAKUTA KEIJI
NAKAGAWA KENICHI
YAMADA HIDEAKI
TOKYO METRO SEWERAGE SERV CORP
CHUGOKU KOGYO KK
Shiro Terasaki
Yoshiki Kuroki