Relevant Competitive Tests:
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 8.0Correct Answer
C. 8.5 to 10.0
D. 10.5 to 12.0
Correct Option: B. 6.5 to 8.0
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