Problems and solutions on cesspit-odor in sewerage

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  • FUKATANI Wataru
    National Institute for Land and Infrastructure Management Ministry of Land, Infrastructure, Transport and Tourism

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  • 下水道におけるビルピット臭気問題とその解決法
  • ゲスイドウ ニ オケル ビルピット シュウキ モンダイ ト ソノ カイケツホウ

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In downtown of Japanese big cities, lots of buildings with underground floors are in place. In order to carry wastewater from the underground floor to public sewers, pumps are used because underground floors are below the level of cleanout leading to public sewer. In some pits, wastewater remains for many hours because entering wastewater amount is so small that pumps do not operate regularly. This causes anaerobic reaction of wastewater in the pits. When the pumps start operating under such a situation, corroded wastewater discharged to public sewers releases H2S gas. The odorous gas comes up to the busy streets nearby through gully pots in combined sewer system or through openings of manhole or cleanout covers in separate and combined system. Lots of complaints are being made to sewer operators for this problem.<BR>In this paper, the enforcement of odor control law was proposed by measuring H2S gas concentration in cleanouts. It was difficult to identify the pit of odor emission source because odorous gas moves freely within the total system which ranges from many underground cesspits to sewer. To solve this problem, installation of barometer, which works together with H2S gas meter, into the cleanouts was proposed and its effectiveness was proved.

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