The distribution arms of large trickling filter units rotated at speed – McqOptions

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1.	The distribution arms of large trickling filter units rotated at speed of
A.	\(\frac{1}{3} - \frac{1}{2}\) r.p.m.
B.	1 – 2 r.p.m.
C.	2 – 4 r. p..m.
D.	None of the above
Answer» B. 1 – 2 r.p.m.

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