What is the thickened concentration of primary sludge combined with t

1.	What is the thickened concentration of primary sludge combined with trickling filter humus?
A.	1-3%
B.	4%
C.	5-9%
D.	10%
Answer» D. 10%

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What is the thickened concentration of primary sludge combined with trickling filter humus?

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