What is the thickened concentration of the thickened sludge from the rotating biological contractor?

What is the thickened concentration of the thickened sludge from the r

1.	What is the thickened concentration of the thickened sludge from the rotating biological contractor?
A.	1-2%
B.	3-5%
C.	5-7%
D.	7-9 %
Answer» C. 5-7%

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What is the thickened concentration of the thickened sludge from the rotating biological contractor?

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