Q.

In an activated sludge process which type of pump is used to recirculate the sludge?

A. booster pump
B. centrifugal pump
C. vane pump
D. vertical turbine pump
Answer» B. centrifugal pump
Explanation: the activated sludge does not contain any solids. also, it is not very viscous. hence a centrifugal pump can be used for this application.
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