@article{oai:iwate-u.repo.nii.ac.jp:00010355,
 author = {伊藤, 歩 and 杉山, 潤 and 相澤, 治郎 and 海田, 輝之},
 issue = {557},
 journal = {下水道協会誌},
 month = {Mar},
 note = {空気注入式圧送管路での硫化物生成に及ぼすポンプ施設の運転条件の影響を検討した。北上川上流流域下水道都南処理区雫石幹線の圧送管路では，理論的な必要量以上の空気を注入しているが，圧送管路開放部での気相の硫化水素濃度が50ppm以上に達する場合が頻繁に生じており，また，下水の送水停止時聞が長くなると硫化水素濃度が高くなる傾向がみられた。圧送管路の流出下水は，溶存酸素濃度が0.5mg/lを下回り，全硫化物濃度が1mg/lを上回る場合がしばしばみられたが，空気注入量の増加により，溶存酸素濃度が上昇し，全硫化物濃度が0.2mg/l以下に抑えられた。一方，通常の空気注入量では，送水停止時間が15分， 30分， 60分と長くなるにしたがい，溶存酸素濃度が低下し，全硫化物濃度が上昇することが分かった。したがって，気相の硫化水素濃度を極力低下するためには，空気注入量を増やすことやポンプの運転停止時間を短く抑えるように送水ポンプの運転条件を変更することが必要である。, The influence of operating conditions in the pump facility on sulfide generation in the force main was investigated in the Shizukuishi trunk sewer. In the manhole at the end of the force mains, hydrogen sulfide concentrations in a gas phase were often higher than 50ppm and they tended to be increased by longer intervals of the pump, although air exceeding theoretical requirement is being injected. Sewage discharged from force mains often had dissolved oxygen concentrations less than 0.5mg/l and total sulfide ones higher than 1mg/ l. However, an increase in air injection volume resulted in increases in dissolved oxygen and decreases in total sulfide. Longer intervals of sewage supply to the force mains were found to cause lower dissolved oxygen and higher total sulfide under conventional air injection volume. It is suggested that alteration of operating conditions such as air injection volume and interval of sewage supply is necessary to control the release of hydrogen sulfide into the manhole.},
 pages = {125--132},
 title = {空気注入式圧送管路における硫化物生成に及ぼすポンプ施設の運転条件の影響},
 volume = {46},
 year = {2009}
}