What is the thickened concentration of primary sludge combined with rotating biological contractor?$

What is the thickened concentration of primary sludge combined with ro

1.	What is the thickened concentration of primary sludge combined with rotating biological contractor?$
A.	1-2%
B.	3-4%
C.	5-8%
D.	9-11%
Answer» D. 9-11%

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What is the thickened concentration of primary sludge combined with rotating biological contractor?$

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