1.

_ For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as$?

A. 4.5 to 6.0
B. 6.5 to 8.0
C. 8.5 to 10.0
D. 10.5 to 12.0
Answer» C. 8.5 to 10.0


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