Q.

In which type of tube settler, tubes are slightly inclined in the direction of normal flow?

A. solid contact clarifier
B. steeply inclined tube settler
C. vertical tube settler
D. horizontal tube settler
Answer» D. horizontal tube settler
Explanation: in horizontal tube settler, the tubes are slightly inclined in the direction of normal flow and the sludge settled is drained by filter backwash.they are used in small plants.
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