Sewage Treatment Plant - application of ring blower

There are many application of ring blower.
Sewage water treatment is one of the major application.
Some pictures below;

We installed blowers on the frame.
Two blowers are connented to header. One operates and the other is spare.
Generally, blowers operates 4hours, 8hours or 12hours rotation.

We can see the wire connention of Y connection
For reference, in case of over 10hp, we must choose connetion type whether V wire or Y wire connection before making blower.

The View of sewage water treatment plant in a KOREA.

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