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1. 发明授权

US3557954A Sewage treatment apparatus and method 失效
标题翻译：水处理设备和方法
公开(公告)号：US3557954A
公开(公告)日：1971-01-26
申请号：US3557954D
申请日：1969-07-16
申请人： ALLIS CHALMERS MFG CO
发明人： WELCH FREDRICK M
IPC分类号： C02F3/08 , C02C1/10
CPC分类号： C02F3/082 , Y02W10/15
摘要： A sewage treatment apparatus and method including a biological treatment tank having a rotating biological contactor therein, with means for conducting the mixed liquor discharged from the biological treatment tank to a clarifier or settling tank which separates the mixed liquor into secondary sludge and effluent. In various embodiments the secondary sludge, the effluent, and the mixed liquor are respectively recycled in series with a reactivating device to the input of the biological treatment tank. The reactivating device may comprise a rotatable two-phase contactor. Means are provided for measuring the dissolved oxygen content of the mixed liquor and for varying the speed of rotation of the rotating biological contactor as a function of the measured dissolved oxygen content to control the dissolved oxygen content of the mixed liquor. The speed of rotation of the twophase contactor may also be varied as a function of the measured dissolved oxygen content.

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