| 摘要 |
<p>1,257,249. Agitating and aerating liquids. FMC CORP. 27 Nov., 1969 [29 Nov., 1968], No. 58046/69. Heading B1C. [Also in Division C1] A surface aerator for a sewage treatment plant (see Division C1) comprises a cover plate 27 to which is attached an outer curved member 28 and an inner core-shaped member 29 with a plurality of curved vanes 30 disposed between the latter to form a series of guide channels 32 for the sewage which enters the lower end of the aerator when the latter is rotated and passes through the channels whence it is discharged outwardly in a horizontal direction.</p> |
